The apparatus and method of reusing frequency bands satellite broadcasting for terrestrial broadcast signals

 

Reception of the satellite antenna in the location of the user receives satellite signals at the first frequency from the satellite. Satellite signals come via satellite signal direction within the angle relative to the axis of the antenna. Terrestrial transmitter transmits signals at the first frequency in the direction of transmission from the transmitter to the user's location. Terrestrial transmitter is located relative to the location of the user so that the direction of transmission was under a relatively large angle to the axis of the first antenna. The angle of the transmission axis of the antenna of the satellite is large enough to ensure that the terrestrial signals at the location formed the terrestrial input signals from the antenna smaller than the interference level with respect to the satellite input signals generated by the antenna. Thus, the terrestrial signals do not interfere with satellite signals even though they are transmitted on a common frequency that is achievable technical result. 5 C. and 39 C.p. f-crystals, 4 Il.

This invention relates to devices and methods for broadcast and receive data, including digital television signals, sound signals, and tremendo with the transmission of direct satellite broadcasting on a General frequency.

Currently, the television signals may be received from the satellites that are in geosynchronous orbit about the Earth. Television signals are transmitted from a ground transmitter to the satellite, can be transferred between different satellites, and then relayed from the satellite so that these signals can be received by ground receivers in a given geographical area of coverage within your line of sight to the satellite. In addition to television signals of other types of data can also be passed on to consumers through satellites that are either geosynchronous or ageosynchronous orbit.

Service direct broadcast satellite (PSV) refers to satellite transmission of television signals and other data directly for use in individual homes or viewers that have the appropriate equipment to receive signals. The Federal Commission for communications has appointed the bandwidth of 12.2 GHz to 12.7 GHz for transmission PSV. Many carrier signal is within the frequency band PSV, and each carrier transmits several private television channels. Depending on the compression of these signals, literally hundreds of different channels could the same systems, is that for the reception of signals PSV only need a small antenna in the form of a plate, and the orientation of the receiving plates is not as critical as in earlier systems, satellite broadcasting. Also, the PSV system provides high-quality reception anywhere in the geographical area of reception of the satellite, without the cost of ground transmission lines, such as lines required for cable television.

The existing rules require that the satellites PSV were spaced apart from each other, at least nine (9) degrees geosynchronous arc. Therefore, the receiving antenna signals PSV should be limited to the reception of signals in the sector orientation average of plus or minus nine (9) degrees from the axis of the antenna. Reception of signals in a broader sector than satellite diversity, would lead to interference of signals transmitted by different satellites on the same frequency. Restriction sector directional receiving antenna PSV is the result of asymmetric gain provided by the antenna, relative to the antenna design. Signals PSV reaching the receiving antenna PSV angles outside the sector antenna, receive insufficient gain for interference with the right PSV Cheyenne device, in which the signals PSV and ground signals are taken at close frequency bands. The system described in the patent 5483663 can be implemented in a device with multiple antennas or a mobile antenna. In a device with multiple antennas two separate antennas direct received signals on a common pathway for processing as if they were taken one antenna and transmitted from the same place. In the device with a single antenna moves between one position for reception of signals PSV and another position for reception of terrestrial signals.

The advantage of the system described in U.S. patent 5483663, is that the signals of local origin, whether it be television signals or other data, can be taken simultaneously with signals PSV and processed the same or similar equipment used for signal processing PSV. The signals of local origin can pass local TV, which can be taken in conjunction with national or regional television programs PSV.

BRIEF description of the INVENTION the Aim of the invention is to provide a ground signal simultaneously with satellite signals on a single Geniculum signals on a common frequency.

The purpose of the invention is achieved by transmitting terrestrial signals in a way that ensures that they do not interfere with satellite signals transmitted on the same frequency. The invention can take advantage of receiving antennas with limited sector orientation or receiving angle; they may include transmitting terrestrial signals in the sector of directions different from those transmitted satellite signals. The power level of the ground signals and directional receiving satellite antenna ensures that the transmitted satellite signals can be separated from the terrestrial signals. Although the transmit power ground signal is limited to a level that would prevent interference, terrestrial transmission is still strong enough to produce a signal suitable for use in a remote location.

Several different signals will be considered in this description. The term "satellite signals" refers to signals that are transmitted directly from the satellite, whereas the term "ground signals" refers to signals that are transmitted directly from the terrestrial transmitter. "Satellite input signals" refers to signals, education is worn to the signals educated from land-based signals captured by the antenna and amplified by it.

The invention is used in a situation where satellite signals transmitted to the satellite transmission frequency to a ground location. Satellite signals come via satellite signal from a satellite to a ground location and for receiving satellite antenna in place of reception of the satellite signals. In some implementations of the invention satellite reception antenna Omni-directional, i.e. provides the same gain regardless of the direction in which the signals reach the antenna. In other implementations of the invention satellite reception antenna has a directional characteristic of the reception, at which the gain provided by the antenna reaches its peak on the axis of the antenna and, as a rule, decreases with increasing the angle of the axis.

Omni-directional satellite reception the antenna should be oriented in a certain direction to receive signals from the satellite. However, for receiving satellite signals of a directional receiving antenna satellite, it must be installed in a satellite receiving position. This satellite receiving position of the satellite signal is directed to the fact, to develop a satellite input signals having at least a usable level input signals. This minimum usable level input signals represents the minimum level of the input signal, wherein the reception or signal processing apparatus may extract the desired data.

According to the invention terrestrial signals transmit on the same frequency as the satellite signals. Ground transmit signals from the terrestrial transmitter to the user's location, which may be satellite reception antenna. The invention allows to avoid the interference between terrestrial and satellite signals, ensuring that the power level ground input signals in the receiving satellite antenna is below the interference level relative to the satellite input signals in the receiving satellite antenna. The interference level is the power level of the input signal, which is so close in power to the power level of the satellite input signal that the satellite input signals may not stand out or be different. Terrestrial input signals below the interference level does not interfere with reception or signal processing instruments is the train according to the invention, although ground transmit signals so that they do not have interferonbeta satellite signals, ground signals in the user's location must be strong enough so that they could be taken accordingly oriented terrestrial receiving antenna and separated from the satellite input signals in terrestrial reception antenna. That is, the terrestrial signals at the location must be at least minimally suitable level of ground signals.

If satellite reception Omni-directional antenna, and satellite signals and terrestrial signals captured by the antenna, receive basically the same gain. Thus, for Omni-directional reception of the satellite antenna power level land transfer should be regulated so that the terrestrial signals at the user's location had lower power level than the satellite signals at the location of the user.

If satellite reception antenna in the location of the user is directed, the invention takes advantage of the directional characteristics of the antenna and can transmit terrestrial signals at a high enough power level, forming in receiving satellite antenna, the antenna is oriented in the receiving position of the satellite at the user's location. Terrestrial transmitter is located relative to the location of the user so that the direction of transmission from a terrestrial transmitter to the user's location is under a relatively large angle from the axis of reception of the satellite antenna. Under this relatively large angle ground signals have a much lower gain than the satellite signals. Thus, the power level of the ground signal at the location of the user can be the same or even higher than the level of the satellite signal, and due to different amplification signals, the antenna design, still forming a ground input signal having a power level below the interference level relative to the level of the satellite input signal.

In some applications of the invention, depending on the direction that should be aimed aimed reception satellite antenna for receiving satellite signals, terrestrial transmission can be limited to a particular azimuthal sector. This ground azimuthal sector transfer is limited so as not to include any areas that are within cuticularization satellite. To cover a large geographic service area for terrestrial signal reception while maintaining ground transmit power on reinterventions level, many terrestrial transmitters can be posted on the terrain. In this case, the effective transmission of different transmitters are combined in order to ensure that the terrestrial signals can be confidently taken at each location within the desired geographic service area.

Satellite transmission and terrestrial transmission may contain or transmit any type of data, including television, communication, Internet, sound, video or any other data type. Although the invention is not limited to any specific transmission frequencies, it is quite well adapted to transmit frequencies above one thousand (1000) MHz. Also, although the invention is not limited to using the specific modulation technique of transmission, methods of modulation type phase modulation and spread spectrum (frequency hopping) is preferred at the present time.

These and other objectives, advantages and features of the invention will be clear from the following description of preferred implementations, taken together with the accompanying with the of edincik and receiver or the location of the user.

Fig. 2 - schematic representation of the construction of the receiving antenna for receiving satellite and terrestrial signals on a common frequency.

Fig. 3 is a diagram of the locations of many terrestrial transmitters required to gain admission in a vast geographical area.

Fig.4 - scheme of the terrestrial transmitter and a ground device power control transfer that implements the principles of the invention.

DESCRIPTION of the PREFERRED implementations of the Device according to the invention, which provides simultaneous transmitting terrestrial signals at the frequency used to transmit satellite signals, is shown in Fig.1. As shown in Fig.1, one or more satellites can remain in orbit relative to the earth. Fig.1 shows four satellites 12A, 12b, 12C, and 12d, posted in four different directions from the location of the user 14. Reception of the satellite antenna 16 and ground-based receiving antenna 18, which will be described in detail in relation to Fig.2, can be located in the location of the user 14.

Each of these satellites 12a-d is located in geosynchronous orbit about the center of the Earth is at a certain longitude and latitude on the earth's surface. At geosynchronous orbit catalino the location of the user 14. As known in the art, directional receiving antenna can be oriented at a certain elevation and the direction or azimuth to the desired position of the satellite to receive signals from it. Of course, the satellite signals may be transmitted from satellites are not in geosynchronous orbit. If ageosynchronous orbit aimed reception of the satellite antenna can receive satellite signals only when a satellite passes through the receiving sector orientation or angle of the receiving satellite dish or antenna must be moved to track the satellite.

Currently, all the direct broadcasting satellites within line of sight North America are located on the longitudes and latitudes that require directional receiving antenna facing in a southerly direction from North America to receive signals. Although Fig.1 shows four satellites 12a-d for the purpose of describing the invention, more or fewer satellites can be posted within line of sight defined geographic area. Regardless of the number of satellites aimed reception of the satellite antenna must be aimed at a specific azimuth, vozvysheniya strictly to the North, taken usually at zero degrees. "Elevation" refers to the angle of the axis of the antenna above the horizontal direction. Unlike directional receiving antennas Omni-directional antennas should not be oriented in a certain direction to receive signals. Thus, the Omni-directional antenna in the location of the user 14 would receive signals equally well from each of the satellites 12a-d.

All satellites PSV transmit different signals in the same frequency range. Federal the U.S. Commission on communication has allocated the frequency band from 12.2 to 12.7 GHz for broadcasting PSV. To ensure the absence of interference between the signals transmitted by two adjacent satellites on the same frequency must be performed two conditions. First, satellite reception antenna shall be designed and limited reception of signals with power PSV signal only within a specific sector of reception relative to the antenna axis. Secondly, the satellites should be posted so that the receiving antenna could be installed with a single satellite transmission sector orientation or receiving angle of the antenna.

Under existing rules, an individual satellites PSV should be posted, at the direction of reception, the angle, or the aperture of plus or minus nine (9) degrees or less from the antenna axis. Although the existing rules require explode not less than nine (9) degrees, the invention is not limited to use in situations in which satellites have this magnitude of displacement, or in which satellites operate on existing frequencies PSV.

Fig. 1 also shows the terrestrial transmitter 20, which can transfer at one or more frequencies, identical to the transmission frequency of one of the satellites PSV. Terrestrial transmitter 20 performs directional transmission within a specific sector transfer or azimuthal sector So the transmission Sector T, shown in Fig.1 is 180 degrees, although it may be more or less than this amount. In some situations, the transmission sector may not be limited and can be 360 degrees around the location of the transmitter.

Joint reception antenna structure 22, which may be in the location of the user 14 in Fig.1, shown in Fig.2. Reception of the satellite antenna 16 is designed to receive signals from the satellite direct broadcasting and preferably includes collecting plate 24 and the horn node 26 for receiving signals reflected and masago Converter, not shown in Fig.2, to capture signals routed to the antenna. Received signals, which is defined here as the input signals are routed from the antenna to the reception or signal processing equipment, also not shown, to retrieve information or data. This instrument signal processing is well known and is not the subject of the present invention. Specialists imagine that instead of a horn node 26 for collecting the signals reflected by the plate 24, can be used nodes of other types. In addition, other types of antennas may be used to receive satellite signals.

Reception of the satellite antenna 16 is a directional antenna and thus has such a characteristic of the signal gain provided by the antenna, which strongly depends on the direction in which the signals reach the antenna. Antenna 16 provides maximum gain for signals coming to the structure along the axis of the antenna 28. For signals coming to the antenna structure 16 at an angle to the axis 28, the antenna provides a smaller gain. For the antenna in the form of a plate 16, shown in Fig.2, the antenna gain decreases with increasing angle to the axis 28 to a certain angle on both sides of the axis. Under gorizontalnom direction, vertical direction or both directions.

When reducing the antenna gain with increasing angle relative to the axis 28 is achieved by the angle at which the antenna gain is insufficient to develop a suitable satellite input signal from the antenna 16 for a particular satellite transmission. The maximum acceptance angle, under which the antenna 16 will produce a usable signal, denoted by d max in Fig.1. Conical area defined by the angle d max with respect to axis 28, is usually called the "angle" or the antenna aperture. Satellite signals a certain level of power propagating to the antenna 16 at an angle greater than d max to the axis of the antenna 28, form the input signals from the antenna, the smaller the minimum usable level input signals. Signals below the minimum usable level input signals cannot be distinguished from background or noise antenna, and apparatus for signal processing, receiving input signals, cannot extract data from signals at such low signal levels. Minimum usable level of the input signals is determined by many factors, including the bandwidth of the transmission, the antenna design and the hardware signal processing, which receives signals formed structures 14, is satellite receiving position and directed to receive signals from one of the satellites, for example, satellite 12d. The azimuth and elevation at which the first antenna 16 should be aimed for optimum reception of signals from the satellite 12d, can be, for example, 247.3 C and 25.7 degrees, respectively.

When the orientation shown in Fig.1, a satellite reception antenna 16 at the location 14 cannot receive signals from the terrestrial transmitter 20 in the presence of the satellite signals at the same frequency. Two factors are combined in order to prevent interference between satellite and terrestrial signals. First, the signals transmitted from the terrestrial transmitter 20, come to the location 14 in the direction of the transmission 40, which lies outside the angle of reception of the satellite antenna 16. Thus, the terrestrial signals have a relatively low gain from the reception of the satellite antenna 16 in comparison with satellite signals, the incoming satellite signal direction 42 within the viewing angle of the antenna. Secondly, the power level of terrestrial transmission is regulated according to the invention so that the terrestrial signals at the location 14 with a low gain, provide the an is s 16, which are below the interference level relative to the satellite input signals from the antenna. Thus, despite the fact that the terrestrial signals can actually be captured by the antenna 16 and to produce terrestrial input signals from the antenna, the satellite input signals are relatively strong for instrument signal processing associated with the antenna to distinguish between satellite and terrestrial input signals. The interference level will depend on several factors, including primarily the hardware signal processing, and with the existing technology may lie in the range from 3 to 5 dB below the level of the satellite signals.

Although the direction of the terrestrial transmission in the direction 40 and the power level of the ground signals are combined so as to prevent interference of terrestrial signals with satellite signals at the same frequency, the power level of the ground gear sufficient for the formation of a suitable signal at the location 14. For reception of terrestrial signals required ground-based receiving antenna such as antenna 18, as shown in Fig.2. Terrestrial receiving antenna 18 has a directional characteristic of the gain of such a satellite reception antenna 16 to warranty Alami in the terrestrial antenna. For example, a terrestrial receiving antenna 18 at the location 14 may have an axis 30 that is oriented directly in the direction of the transmission 40 from the terrestrial transmitter 20. The receiving sector orientation or angle from the axis of the antenna 18 denoted by r max in Fig.1. For this orientation of the satellite signals are outside the angle of the ground receiving antenna 18 and receive a much smaller gain compared with terrestrial signals. The terrestrial signals at the location of the 14 strong enough using the gain provided by ground-based receiving antenna 18, to produce terrestrial input signals that can be separated in the terrestrial receiving antenna from any of the input signals, derived from the satellite signals. When the existing technology of terrestrial input signals from ground-based receiving antenna 18 may be higher than 3 to 5 dB or greater than the power level of the satellite input signals from ground-based receiving antenna to separate the ground of the input signals. Thus, the terrestrial transmission device and method according to the invention allow to use both satellite and terrestrial signals carrying completely different information or data, in the location of the user 14.

STRs and provides the ability to re-surface use of frequency bands, pre-allocated exclusively for satellite transmission. In addition, as the ground transmitter according to the invention has a limited effective transmission sector, the band re-used for terrestrial transmission, can also be reused for terrestrial transmission in many different geographical areas.

It is clear that terrestrial receiving antenna 18 at the location 14, or any other location of the user is not the subject of the present invention. Terrestrial receiving antenna 18 is shown and described here only to underscore the usefulness of ground-based transmitting device and method according to the invention. Reception of the satellite antenna 16 is also not the subject of the invention. Rather, the satellite reception antenna 16 is described here for the purpose of describing the method and of the direction in which ground signals must be transferred in accordance with the invention. In any case, satellite and ground receiving antenna, which can be in any location of the user 14 does not need to combine in a single structure. The joint structure 22, shown in Fig.2, shown for convenience of description ground transmitter of the invention disclosed here.

Noah in Fig.1 and 2, and no angle or directional sector of admission. Rather the gain provided by the antenna, does not essentially depend on the direction in which the signals reach the antenna. In this case, the method of the invention includes transmitting terrestrial signals at the first frequency is the same as above to the case where reception of the satellite antenna is a directional antenna. However, you cannot rely on the transmission direction of ground signals to produce terrestrial input signals below the interference level relative to the satellite input signals received in Omni-directional receiving satellite antenna. Rather for Omni-directional reception of the satellite antenna power level terrestrial transmission is adjusted to the terrestrial signals at the user's location were below the interference level relative to the satellite signal in the user's location. Since the Omni-directional antenna equally enhances both terrestrial and satellite signals, the signal level at the location of the reception of the satellite antenna ensures that terrestrial input signals are below the interference level relative to the satellite input signals.

In accordance with alow for reception over a large area and relatively weak, in order to prevent interference with satellite signals on a single frequency. Each transmitter 32 in Fig.3 aims passes in the azimuthal sector And approximately equal to 180 degrees, the effective radius R. Thus, each transmitter 32 transmits in the effective transmission 43. With such diversity transmitters and transmission distance signals from terrestrial transmitters 32 may be taken in any location within the geographic service area that includes the combined effective transmission of several terrestrial transmitters. Although the sector orientation of 180 degrees is specified, for example, terrestrial transmission can be carried out in other sectors in the scope of this invention. However, in each case of terrestrial transmission from each transmitter 32 are carried out in areas that are outside of the angle of reception of the satellite antenna in any location and with limited power ground signal according to the invention, and ground signals do not interfere with satellite signals transmitted on the same frequency.

On the other hand, the user's location itself may contain a transmitter for directional transmission on ASL as to the location of the user, and from it. Transfer from the user's location should be limited to not include any direction within the angle of view of the nearby satellite reception antenna, and should have limited transmission power, as described above in relation to other terrestrial transmission.

When applying the invention for multiple terrestrial transmission device shown in Fig.3, it is desirable, but not necessary to synchronize the signals from several transmitters 32. Synchronization in this sense means that each transmitter transmits the same data on the same frequency so that they could be taken simultaneously in the user's location, which is within the effective area of the transmission region defined by the radius R) of two or more transmitters. Thus, regardless of which transmitter 32, the user will direct their ground receiving antenna, it will take the same data as any other user of terrestrial signals at this frequency in the geographic service area. Transmitters may contain associated synchronization signal 44 for the implementation of the synchronized transmission. The specialist is that DL is nchronization signal 44 can include a high-speed communication line, such as fiber optic or high-speed electric lines of communication to deliver data that you want to transfer or synchronization signals between the transmitters 32. Or synchronization tool 44 may include antenna with high gain for transmitting received signals from one transmitter 32 to the other. Any such perepletnye antennas and high-speed communication lines should be treated as equivalent to the synchronization signal according to the invention.

As described above relative to Fig.1, the power level, which can be transmitted to the terrestrial signals must be limited to prevent interference with satellite signals transmitted at the same frequency. However, the transmit power must be strong enough to produce a usable signal level in a remote location, such as location 14. The power level of the ground signals is highest near the transmitter and decreases with increasing distance from the transmitter.

Thus, the transmit power is limited to a maximum ground-level signal potential satellite location that is nearest to the terrestrial transmitter 20. is the user - this signal, which forms the ground of the input signal in the receiving satellite antenna in a nearby location, which lies slightly below the interference level relative to the satellite input signals that can be accepted by the receiving satellite antenna in this location. Transmit power, providing signals at this level in the near location to the terrestrial transmitter 20 is the maximum allowable transmit power and determines the effective range or area transmission terrestrial transmitter.

This maximum level and all transmit power levels below it are reintervention power levels and form reintervention terrestrial input signals in any satellite reception antenna in the effective transmission of the terrestrial transmitter 20.

Some of the area around ground transmitter can be designated as an exclusion zone and the closest location to ground the transmitter can be defined as the location on the border of the exclusion zone. In this case, the transmit power ground of the transmitter is adjusted so that the terrestrial signals were slightly lower interference power level Utri area is level, which could lead to interference with satellite signals, if the design of the reception of the satellite antenna will not be changed in order to increase the directivity of the antenna, i.e. the difference between the gain of the satellite signals and gain ground signals.

It is obvious that the maximum power level at which ground signals may be transferred in accordance with the invention depends in part on the power level of the satellite signals at different locations of the user. As shown in Fig. 1 and 4, one preferred implementation of the invention includes a device or means to regulate power ground transmission 46 to determine the power level of the satellite signals and to use this power level for setting the power level of the terrestrial transmitter 20. Referring to Fig.4, ground controls the power level of the transmission 46 may include a calibrated receiver or any other suitable device, which can determine the capacity of the satellite signal. Shows the calibrated receiver includes receiving a satellite antenna 48, the inverter with decreasing frequency 50, preferably selector channels 52 and detector amplifier 54.dinino with one comparator input. The other comparator input is connected to receive a signal from the detector amplifier 54. The output of comparator 56 is connected to the level control 58 associated with the terrestrial transmitter 20.

Shows the transmitter 20 includes the encoder 60, which receives and encodes the input signal for terrestrial transmission, and also includes a modulator 62, which have the required modulation transfer. The level Adjuster 58 is placed between the modulator 62 and the upconverter frequency 63, which converts the signals to the desired higher frequency transmission. The converted signals are amplified by amplifier 64 and sent to the antenna of the transmitter 66.

The device controlling the power level 46 works by continuously monitoring the satellite signal, which due to the particular orientation of the satellite and/or transmit power, the most susceptible to interference from terrestrial transmission signals. Reception of the satellite antenna 48 is directed to receive signals from the most vulnerable to the interference of the satellite, and the received signal is transferred to an intermediate frequency Converter with frequency is reduced by 50.

The converted signal can be processed by the selector channels 52 to select one of the th amplifier 54. This signal DC voltage representing the power level of the received satellite signal is compared with a reference signal by the comparator 56. The reference signal has a variable resistance 57, so that the comparator output is zero. With this setup, the power level of the transmitter 20 is set at the maximum reinterpreting power level. When the power level of the ground signals in different locations outside any exclusion zone around the transmitter 20 is formed terrestrial input signals below the interference power level in respect of any satellite input signals at the same frequency. However, since the capacity of the satellite signals received in the antenna 48, changes over time, the output of comparator 56 causes the level Adjuster 58, respectively, to change the transmit power of the terrestrial transmitter 20. When the satellite signal becomes weaker than for the initial conditions, the output of comparator 56 is less than zero, which causes the level control 58 to reduce the transmit power of the transmitter 20. When the satellite signal becomes stronger, the output of comparator 56 is returned to zero, which causes the reg here with reference to Fig.1 and 2. The first frequency is already being used for transmitting signals from the satellite, such as satellite 12d, satellite signal direction 42 to the location 14. Satellite signals taken at the location 14 receiving satellite antenna 16 shown in Fig.2. Reception of the satellite antenna 16 has a directional characteristic of the reception with a maximum gain along the axis of the antenna 28 and a lower reinforcement angles from the axis of the antenna. Reception of the satellite antenna 16 is installed in a satellite receiving position at which the satellite signal direction 42 is within the angle d max on both sides or with respect to axis 28 of the antenna. This satellite receiving position of the satellite signals comprise satellite input signal from the reception of the satellite antenna 16, and this input signal is at least at a minimum usable signal level for some hardware signal processing.

The method of the invention includes transmitting terrestrial signals at the first frequency, that is, the transmission frequency of the satellite signals. Ground signals are transmitted in the directions, including the direction of the transmission 40 from the transmitter 20 to the location 14. According to the invention, the transmitter 20 is located so that the La, to the terrestrial signals at the location 14 formed terrestrial input signals below the interference level relative to the satellite input signals generated in the antenna 16. The terrestrial signals at the location 14 also have a power level at least, which is the minimum usable terrestrial signal level. This minimum usable terrestrial signal level of the ground signals can be trapped in terrestrial antenna 18, which may be in the location of the user 14. Terrestrial antenna 18 is a directional antenna to ensure the absence of interference of the satellite signals with ground signals.

With the current technology level of the satellite signal in any terrestrial location of the user may vary from -120 dBm to -125 dBm at the clear sky and from -122 dBm to -127 dBm under more adverse weather conditions. Based primarily on the direction of reception of the satellite antenna and the capabilities of the hardware signal processing associated with receiving satellite antenna, the power level of the ground signal in the user's location must remain below approximately -95 dBm. This power level Nazli and strengthening of about -2 dB for terrestrial signals, as the interference level by approximately 4 dB below the power level of the satellite input signal. When the existing technology of terrestrial input signals should remain approximately 4.5 dB (3 to 5 dB) below the satellite input signals for the apparatus for signal processing in order to distinguish between the satellite input signals and to extract the required data from the satellite input signals. Specialists represent that the invention is not limited to these values of signal power, and that these values are given for the purpose of illustration and example.

Also according to the invention, the terrestrial transmitter 20 transmits only in ways that do not lead to interference with satellite signals at any location within the effective sector transfer terrestrial transmitter. That is, the direction 40 from the transmitter 20 to any location 14 lies at such an angle relatively properly installed satellite reception antenna in the proper location, at which terrestrial input signals of the reception of the satellite antenna are always below the interference level relative to the satellite input signals, which may be formed by receiving satellite antenna.th location of the transmission, the method of the invention can also include a power control of the satellite signals and the installation of power-ground transmission at the maximum reinterpreting the power level on the basis of a certain power of the satellite signal.

In accordance with Fig.3 the method also includes transmitting from the second terrestrial transmitter 32 to the second position, which can be any within a distance R from the second terrestrial transmitter. Direction from the second transmitter to the second location lies at such an angle to the properly oriented receiving satellite antenna at the second location, in which are formed the terrestrial input signals below the interference level relative to the satellite input signals, which are formed from the satellite signals received by the receiving satellite antenna at the second location.

The EXAMPLE Tests were conducted using a mobile test antenna. The test apparatus consisted of a receiving antenna PSV-related equipment signal processing. Hardware signal processing has been connected to receive input signals from the receiving antenna PSV and directed to the desired output channel to the receiver. Pavlyuchenko approximately 5 degrees on both sides from the axis of the antenna. The gain of the receiving antenna PSV ranged from -2 dB to -16 dB outside of the angle of the antenna.

When testing was used terrestrial transmitter having a directional transmitting antenna raised to 52 feet above the Earth's surface and the guide output power in the range of azimuth 180 degrees (just to the South) with horizontal polarization. Installation of ground-based transmitter has not changed relative to this configuration during testing. Change the transmission power, as described below.

The interference tests were conducted in several different testing locations or locations of the user, exploded from the ground location of the transmitter. In each test the location of the receiving antenna PSV first climbed in order to achieve direct line of sight with the ground transmitter, and then its axis oriented in the direction of transmission of the terrestrial transmitter. As soon as was verified direct visibility between the test antenna PSV and terrestrial transmitter was installed isotropic power level of the reception from terrestrial transmitter operating at full power 29 dBm.

In each test the location of the receiving antenna PSV then the Noah antenna PSV was focused on the signal direction of the satellite. Satellite signals at a certain frequency were taken and sent to the receiver associated with the test device. In each test location, the direction of transmission from a terrestrial transmitter to the test location was outside the viewing angle of the receiving antenna PSV optimally set for the reception of the satellite signals from the satellite PSV. Terrestrial transmitter used to transmit on the same frequency with the received satellite signals 12.470 GHz. In each trial, in the presence of interference with established satellite signals PSV that was indesirables distorted television reception, power ground transmitter was reduced to the level at which the interference has disappeared, that is, until the power level a little below the interference level, this level was recorded.

For the meteorological conditions under which the trials were carried out was determined power level of the satellite signal at each test location, approximately -125 dBm. Under these conditions, the power level ground transmission 13 dBm formed the exclusion zone when the transmission directions around a terrestrial transmitter, comprising approximately one square zemnoi transmitting antenna. Estimated power level of the ground signal for this test was approximately -137 dBm.

The above-described preferred implementations are intended to illustrate the principles of the invention and not to limit the scope of the invention. Various other implementations and modifications of the above preferred implementations can be made without deviation from the scope of the claims.

Claims

1. A way to reuse the first transmission frequency, already used for the transmission of satellite signals from a satellite in a satellite signal towards the first location for receiving a satellite reception antenna, which can be placed in the first location, and satellite reception antenna provides maximum gain for signals received along the axis of reception of the satellite antenna and a lower reinforcement angles to the axis, and satellite signals have a power level signal in the first location that, when the reception of the satellite antenna is installed in a satellite receiving position in which the transmission direction of the satellite lies in predeliberation satellite signals from a satellite reception antenna, which are, at least at a minimum usable level satellite input signals, and the method includes step (a) transmitting terrestrial signals at the first transmission frequency from the first terrestrial transmitter, and ground signals are transmitted in the directions, including the direction of transmission from the first terrestrial transmitter to the first location, and direction of transfer lies at such an angle to the axis of reception of the satellite antenna when reception of the satellite antenna is a satellite receiving position that the terrestrial signals at the first location to form terrestrial input signals from the reception of the satellite antenna, which have a power level less than the interference power level relative to the satellite input signals and terrestrial signals at the first location have the power level being at least at a minimum usable terrestrial signal level.

2. The method according to p. 1, where (a) terrestrial signals are transmitted directionally in a limited azimuthal sector relative to the first transmitter.

3. The method according to p. 1, comprising (a) a transfer by a transfer from the first terrestrial transmitter, and each direction is fishing in any location along such direction, moreover, the angle from the axis of the corresponding satellite receiving antenna is such that the terrestrial signals at the above mentioned location can form terrestrial input signals from the reception of the satellite antenna, which is located at a power level less than an interference power level relative to the satellite input signals, which may be formed of the satellite signals received in the receiving satellite antenna.

4. The method according to p. 1, where there is a second location in which the second satellite reception antenna, can receive satellite signals transmitted at the first frequency, the second signal from the satellite to the second location, the second satellite reception antenna provides maximum amplification of the signals received along the axis of the second receiving satellite antenna and satellite signals have a power level of the signal in the second position, when the second satellite reception antenna at the second location is determined in the second satellite receiving position, when the transmission direction of the satellite is within the receiving satellite angle relative to the axis of the second receiving satellite ant is the quiet are, at least at a minimum usable level satellite input signals, and the method further includes a step (a) transmitting terrestrial signals at the first transmission frequency from the second terrestrial transmitter in the second location of the transmitter, and the second terrestrial transmitter has an effective area of the transfer, which is different from the effective transmission of the first terrestrial transmitter, and effective transfer of the second terrestrial transmitter includes a second location, and ground signals from the second terrestrial transmitter are transmitted in the directions, including the direction of transmission from the second terrestrial transmitter to the second location, moreover, the direction of transmission to the second location is at such an angle to the axis of the second receiving satellite antenna, when the second satellite reception antenna is a satellite receiving position at the second location that the terrestrial signals from the second transmitter in the second location to form terrestrial input signals from the second satellite reception antennas, which have a power level less than an interference power level relative to the satellite input signals.

5. Spoonie on the first transmission frequency.

6. The method according to p. 5, where (a) the effective transmission of the first terrestrial transmitter overlaps with the effective region of the second terrestrial transmitter.

7. The method according to p. 4, where (a) the effective area of the transfer of the first terrestrial transmitter and the effective area of the second terrestrial transmitter do not overlap; (b) the first terrestrial transmitter and the second terrestrial transmitter to simultaneously transmit different data on the first frequency.

8. The method according to p. 1, including the step of transmitting signals from the second terrestrial transmitter, where (a) the effective area of the transfer of the first terrestrial transmitter and the effective area of the second terrestrial transmitter overlap; (b) the first terrestrial transmitter and the second terrestrial transmitter to simultaneously transmit data on a different frequency.

9. The method according to p. 1, where (a) satellite signals transmitted from multiple satellites, each satellite transmits satellite signals for reception within the receiving satellite angle relative to different axes receiving satellite antenna from the first location, for education satellite input signals at a satellite antenna oriented along a respective axis, and napravlennosti form of terrestrial input signals from the reception of the satellite antenna, oriented along the appropriate axis, these terrestrial input signals have a power level less than an interference level with respect to the satellite input signals in the receiving satellite antenna.

10. The method according to p. 1, comprising the steps of (a) continuous determination of the power level of the satellite signal in the location of the first terrestrial transmitter; (b) install the transmission power of the first terrestrial transmitter on reinterpreting level based on the power level of the satellite signal that is defined near the first terrestrial transmitter and reinterpreting level ensures that each location within the effective transmission around the first terrestrial transmitter accepts a ground signal from the first terrestrial transmitter power level, forming reintervention terrestrial input signals from the reception of the satellite antenna oriented to receive satellite signals in the above mentioned location, and reintervention terrestrial input signals have a power level less than an interference level with respect to the satellite input signals formed by the satellite receiving antenna in the above-mentioned groups (a) receiving signals, transmitted from the satellite at the first transmission frequency; (b) converting signals transmitted from the satellite at the first transmission frequency, the signal representing the power level of the satellite signal.

12. The method according to p. 11, where the step of setting the transmission power of the first terrestrial transmitter includes the stage of (a) comparing the signal representing the power level of the satellite signal with a reference signal to obtain the output signal of the comparison.

13. The method according to p. 12, further comprising the step of using the output signal of the comparison to control the power level of the first terrestrial transmitter.

14. The method according to p. 13, where the step of using the output signal of the comparison to control the power level of the first terrestrial transmitter includes the stage-management level of the modulated signal of the first terrestrial transmitter.

15. A device that provides simultaneous transmission of terrestrial signals on a common frequency with satellite signals transmitted from a satellite in a satellite signal toward the first location, and satellite signals transmitted at the first frequency for receiving satellite antenna, which may be in the first places is about the axis of reception of the satellite antenna and a lower reinforcement angles to the axis, and satellite signals have a power level of a signal that, when reception of the satellite antenna is installed in a satellite receiving position in which the transmission direction of the satellite is within the receiving satellite angle relative to the axis of reception of the satellite antenna, these satellite signals comprise satellite signals from a satellite reception antenna, which are, at least at a minimum usable level satellite input signals, and the device includes a first terrestrial transmitter for transmitting signals at the first frequency in the direction of transmission from the first ground location of the transmitter to the first location, moreover, the direction of transmission lies at such an angle to the axis of reception of the satellite antenna when reception of the satellite antenna is a satellite receiving position that the terrestrial signals at the first location to form terrestrial input signals from the reception of the satellite antenna, which have a power level less than an interference level with respect to the satellite input signals and terrestrial signals at the first location have power levels that are at least on minimalny transmitter for directional transmitting terrestrial signals in a limited azimuthal sector relative to the first transmitter.

17. The device according to p. 15, where (a) the first terrestrial transmitter transmits the set of transmit directions from the first terrestrial transmitter, and each transmission direction is at an angle to the axis of reception of the satellite antenna oriented to receive the satellite signals at the location on the direction and the angle from the axis of the corresponding receiving satellite antenna is such that the terrestrial signals at the respective location can form terrestrial input signals from the respective receiving satellite antennas, which have a power level less than an interference level with respect to the satellite input signals that can be formed from the satellite signals, received in the corresponding receiving satellite antenna.

18. The device according to p. 15, further comprising a second ground transmitter at the second location transmitter for transmitting terrestrial signals at the first frequency and the second terrestrial transmitter has an effective area of the transfer, which is different from the effective transmission of the first terrestrial transmitter.

19. The device according to p. 18, additionally comprising (a) means than is Itachi signal enables the first terrestrial transmitter and the second terrestrial transmitter to simultaneously transmit the same data at the first frequency.

20. The device according to p. 19, where (a) the effective transmission of the first terrestrial transmitter overlaps with the effective region of the second terrestrial transmitter.

21. The device according to p. 18 (a) effective transmission of the first terrestrial transmitter and the effective area of the second terrestrial transmitter do not overlap; (b) the first terrestrial transmitter and the second terrestrial transmitter to simultaneously transmit different data on the first frequency.

22. The device according to p. 15, where (a) satellite signals transmitted from multiple satellites, each satellite transmits satellite signals for reception within a satellite reception angle relative to different axes of the reception of the satellite antenna in the first location, forming a satellite input signals at a satellite antenna oriented along a respective axis, and the direction of transmission lies at such an angle to each axis receiving satellite antenna that the terrestrial signals at the first location to form terrestrial input signals from the reception of the satellite antenna oriented along a respective axis, these terrestrial input signals have a power level less than the interference level consider omnitele including (a) means for monitoring the power of the satellite signals for the continuous determination of the power level of the satellite signal in the location of the first terrestrial transmitter; (b) means for regulating the transmission power associated with the first terrestrial transmitter to set the transmission power of the first terrestrial transmitter on reinterpreting level based on the power level of the satellite signal defined by means of power control of the satellite signal, and reinterventions level ensures that each location within the effective transmission around the first terrestrial transmitter accepts a ground signal from the first terrestrial transmitter power level, forming reintervention terrestrial input signals from the reception of the satellite antenna oriented to receive satellite signals in the above location, and reintervention terrestrial input signals have a power level less than the interference level with respect to the satellite input signals formed by the satellite receiving antenna at the above location.

24. The device according to p. 23, where the power control of the satellite signals include (a) a satellite antenna configured to receive signals from the satellite at the first transmission frequency; (b) the detector amplifier to convert the signal received is. 24, where the power control of the satellite signals further include (a) a comparator for comparing the signal representing the power level of the satellite signal with a reference signal to obtain the output signal of the comparison.

26. The device according to p. 25, where the means of regulating the power transmission includes a level controller connected to the first terrestrial transmitter and the output of the comparator is connected with level control.

27. The device according to p. 26, where the level control is connected to the output of the modulator is associated with the first terrestrial transmitter, to control the level of the modulated signal in the first terrestrial transmitter.

28. A device that provides simultaneous transmission of terrestrial signals on a common frequency with satellite signals transmitted from the satellite, and the satellite signals are transmitted on the first frequency of the satellite transmission direction to the reception of the satellite antenna in a location that can be located anywhere within the geographical service area, and satellite reception antenna provides maximum gain for signals received along the axis of reception of the satellite antenna and a lower reinforcement angles to the axis, and sputnikovoe receiving position, when the transmission direction of the satellite is within the receiving satellite angle relative to the axis of reception of the satellite antenna, these satellite signals comprise satellite signals from a satellite reception antenna, and satellite input signals are at least at a minimum usable level satellite input signals, and the device includes (a) a set of spaced apart ground-based transmitters, each ground transmitter adapted for transmitting terrestrial signals at the first frequency, and a multitude of spaced apart ground-based transmitters ordered so that each corresponding location within the geographic service area has a direction of transmission on one of the terrestrial transmitters, moreover, the direction of transfer is at such an angle to the axis of reception of the satellite antenna when reception of the satellite antenna is a satellite receiving position in an appropriate location that the terrestrial signals at the respective locations are, at least at a minimum usable terrestrial signal level, but form terrestrial input signals from the reception of the satellite antenna, which have a power level less) many terrestrial transmitters ordered that none of the terrestrial transmitter is not transmitting on the way, which is at such an angle to the axis of reception of the satellite antenna to satellite reception position in any location that the terrestrial signals in the respective relocate the receiving satellite dish form the input signals from the receiving satellite antenna located at or above the interference power level relative to the satellite input signal in an appropriate location.

30. The device according to p. 28, additionally comprising (a) a synchronization signal associated with each ground transmitter, allowing ground-based transmitters simultaneously send the same signal at the first frequency.

31. The device according to p. 28, where (a) each ground transmitter transmits signals across a common azimuth sector from the corresponding location of the transmitter.

32. The device according to p. 28, where the first frequency is above approximately 1000 MHz.

33. The device according to p. 28, additionally comprising (a) means for monitoring the power of the satellite signal for the continuous determination of the power level of the satellite signal at a location within the geographic service area; (b) the means of regularization on reinterpreting level based on the power level of the satellite signal, specific controls power satellite signal, and reinterventions level ensures that each location within the geographic service area receives a ground signal from each of the terrestrial transmitter power level, forming reintervention terrestrial input signals from the reception of the satellite antenna oriented to receive satellite signals in the above location, and reintervention terrestrial input signals have a power level less than an interference level with respect to the satellite input signals formed by the satellite receiving antenna at the above location.

34. The device according to p. 33, where the power control of the satellite signal includes (a) a satellite antenna configured to receive signals from the satellite at the first transmission frequency; (b) the detector amplifier for converting signals received satellite signal representing the power level of the satellite signal.

35. The device according to p. 34, where the power control of the satellite signals further include (a) a comparator for comparing the signal representing the power level with the power control of transmission include level control, connected to the first terrestrial transmitter and the output of the comparator is connected with level control.

37. The device according to p. 36, where the level control is connected to the output of the modulator is associated with the first terrestrial transmitter, to control the level of the modulated signal in the first terrestrial transmitter.

38. The method that provides simultaneous transmission of terrestrial signals on a common frequency with satellite signals transmitted from the satellite, and the satellite signals are transmitted on the first frequency of the satellite transmission direction to the reception of the satellite antenna in a location that can be located anywhere within the geographical service area, and satellite reception antenna provides maximum gain for signals received along the axis of reception of the satellite antenna and a lower reinforcement angles to the axis, and satellite signals have a power level of a signal that, when reception of the satellite antenna is installed in a satellite receiving position, when the transmission direction of the satellite is within the receiving satellite angle relative to the axis of reception of the satellite antenna, these satellite signals comprise satellite input signal is also suitable level satellite input signals, moreover, the method includes the steps of (a) transmitting terrestrial signals at the first frequency from a multitude of spaced apart ground-based transmitters, and multiple distributed terrestrial transmitters ordered so that each corresponding location within the geographic service area has a direction of transmission on one of the terrestrial transmitters, the transmit direction is at an angle to the axis of reception of the satellite antenna when reception of the satellite antenna is a satellite receiving position in an appropriate location that the terrestrial signals at the respective locations are, at least at a minimum usable terrestrial signal level, but form terrestrial input signals from the reception of the satellite antenna, which have a power level less than an interference level with respect to the satellite input signals.

39. The method according to p. 38, additionally comprising (a) simultaneous transmission of the same terrestrial signals at the first frequency from a variety of terrestrial transmitters.

40. The method according to p. 38, where (a) satellite signals transmitted from multiple satellites, each satellite transmits satellite signals for reception within different with the b on p. 38, where (a) each ground transmitter transmits across a common azimuth sector from the corresponding location of the transmitter.

42. The method according to p. 38, where the first frequency is above approximately 1000 MHz.

43. The method according to p. 38, where (a) many terrestrial transmitters ordered so that none of the terrestrial transmitter is not transmitting on the way, which is at such an angle to the axis of reception of the satellite antenna to satellite reception position in any location that the terrestrial signals at the above mentioned location form the input signals from the receiving satellite antenna located at or above the interference power level relative to the satellite input signals.

44. A way to reuse the first transmission frequency, already used for the transmission of satellite signals from a satellite in a satellite signal towards the first location for receiving a satellite reception antenna, which can be placed in the first location, and satellite signals have a sufficient power level of the signal in the first location for the formation of satellite input signals from the reception of the satellite antenna, which are, at least on manilow on the first transmission frequency from the first terrestrial transmitter, moreover, the terrestrial signals at the first location to form terrestrial input signals from the reception of the satellite antenna, which have a power level less than an interference power level relative to the satellite input signals and terrestrial signals at the first location have the power level being at least at a minimum usable terrestrial signal level.

Priority items: 16.12.1997 on PP.1-9, 15-18, 20-22, 28, 29, 31, 32, 38-44; 31.12.1997 on PP.10-14, 19, 23-27, 30, 33-37.

 

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FIELD: communications engineering.

SUBSTANCE: proposed system has user terminal, gateway, and plurality of beam sources radiating plurality of beams, communication line between user terminal and gateway being set for one or more beams. Proposed method is based on protocol of message exchange between gateway and user. Depending on messages sent from user to gateway, preferably on pre-chosen periodic basis, gateway determines most suited beam or beams to be transferred to user. Messages sent from user to gateway incorporate values which are, essentially, beam intensities measured at user's. Gateway uses beam intensities measured at user's to choose those of them suited to given user. Beams to be used are those capable of reducing rate of call failure and ensuring desired separation level of beam sources.

EFFECT: reduced rate of call failure in multibeam communication system.

20 cl, 27 dwg

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