System and method for positioning wireless transceiver system multiple access, code-division multiplexing

 

The invention relates to communications systems. Achievable technical result is fast, accurate and efficient determination of the location of a cell phone. The invention combines the technology of determining the position using the GSP (Global Positioning System) and wireless communication to ensure accurate positioning in urban environments and other environments where line-of-sight satellites in somewhat shaded. The apparatus and method corresponding to the invention include the use of signals from only two satellites SHGs and the serving base station. In its broadest aspect, the method corresponding to the invention, includes the steps of receiving at the base station a first signal transmitted from the first satellite of the SHGs, and the second signal transmitted from the second satellite SHGs. The transmitter and receiver of the mobile station receive these signals GSP and the transmission in response to the third signal to the base station. The base station receives the third signal and uses it to calculate the position of the wireless unit. 3 S. and 18 C.p. f-crystals, 8 ill., 1 PL.

The technical field,

The present invention relates to systems is the main transmitter in the system, multiple access, code-division multiplexing.

Prior art

Deployment of technologies to determine location in wireless networks is facilitated by the authorities and the desire of providers of communication services to increase revenues by expanding the range of services compared to competitors. In addition, in June 1996, the Federal communications Commission (FCC) issued a document in support of the expansion of the emergency 911 (E-911). Part I of the manual requires that PVOB (Item Receive Calls Public Security service) had received information about the sector and cell to cell communication. Part II Instructions requires PVOB reported location of the mobile transceiver. Pursuant to instructions FCC nodes, the total number 77000, 2005 shall be equipped with means for automatically determining the location.

There are many ways to enable automatic location. One such method involves measuring the difference in time of receipt of signals from multiple sites of cellular communication. To retrieve information on the location of the processing of these signals by the method of triangulation. Unfortunately, to this method was affelay communication. The reason is that in the conventional system mdcr every phone transmits a signal with sufficient power only to achieve the nearest node of the cellular communication. As for the triangulation of communication required at least three stations, would have to increase the concentration of nodes cellular or increase the signal strength of each wireless unit.

In any case, every known method has significant disadvantages. The increase in the number of nodes cellular would require excessive costs. The increase in signal strength would increase the weight and cost of each wireless unit and to increase the likelihood of mutual interference between wireless units. In addition, the triangulation method does not provide the accuracy required by the regulations of the FCC.

Another approach involves giving the cell phone functionality GSP (Global Positioning System). Although the implementation of this approach is associated with a significant increase in cost and weight of the wireless unit, having four satellites in line of sight, as well as some slower, it provides the greatest accuracy for the location.

Cremazie, indicates which frequencies the wireless unit should seek bearing SHGs. To minimize performed by the receiver of the search signal of the visible satellites in the frequency domain in most receivers SHG is a so-called directory satellites SHGs. The catalog is a 15000-bit block coarse ephemeris data and time model for the entire constellation. Information in the catalog concerning the status of the satellite and the time of day, is only approximate. In the absence directory GSP receiver to detect the signal from the satellite, must conduct the search in the widest possible frequency range. For more information, contributing to the detection of other satellites that requires additional processing.

The process of signal detection can take several minutes due to a large number of items resolution frequency, which is supposed to search. Each element of the resolution in frequency is the average frequency and the desired width. The presence of the directory reduces the uncertainty of the Doppler frequency of the satellite and hence the number of elements to allow the frequency resolution, which is supposed to search.

Satellite directory, you can retrieve whether the signaling messages sent to the receiver. Upon receiving this information, the receiver performs signal processing of SHGs to determine their location. Although this approach can provide a slightly higher speed, its disadvantage is that its implementation requires line of sight of at least four satellites. In urban areas this can be a problem.

Thus, there is a need for a system or method for rapid, accurate and cost-effective location of a cell phone.

The invention

To solve this problem the present invention proposes a system and method of determining the position of the wireless transceiver. In its broadest aspect, the method corresponding to the invention, is a mixed approach to determining position using information on the distance from a ground-based system, information on bronirovaniju from the wireless unit and the information on the distance from the satellites SHGs. This information can be combined to provide a fast and reliable determination of the position of the wireless unit. The method corresponding to the invention, includes the steps of receiving in the wireless Blo the SHG, and a third signal from a third satellite. The wireless unit is made capable of receiving these signals GSP, and transferring, in response to the fourth signal to the base station. The base station receives the fourth signal, and adjusts the offset hours, introduced in the fourth signal by delaying bilateral passing signals between the base station and the wireless unit, and uses the corrected fourth signal to calculate the position of the wireless unit.

According to a particular implementation variant, the base station transmits to the wireless unit auxiliary information. Auxiliary information used by the wireless unit for rapid detection of signals transmitted first, second and third satellites. Auxiliary signals are formed from the information received in the transceiver subsystem base station (PBS) serving wireless unit, and includes identification information of the satellite, the information of the Doppler shift and the values indicating the distance between the base station and each satellite and the size of the search window associated with each satellite, and the size of the search window is calculated based on the delay bilateral PR is Eugenia signals, passed first, second and third satellites, wireless unit calculates the distance from the wireless unit to each of the satellites, pm1, pm2 and pm3, respectively. This information is in range is transmitted back to the base station together with information relating to the time when the measurement was taken. In a variant implementation mdcr time, when a wireless unit transmits to the base station of the fourth signal is known at the base station. The delay in receiving the fourth signal indicates the base station, the distance between the wireless unit and the base station. In addition, the delay provides a means of adjusting the absolute time of the wireless unit.

A device external to the mobile device, for example, a base station controller or any other object associated with the infrastructure of the cellular system uses the information known to the service base station, for example, its position, the position of the first, second and third satellites relative to the wireless unit and the distance between the wireless unit and the base station for calculating the position of the wireless unit. This is done by finding the first intersection of the sphere with radius CP1 with the center in peetham the satellite and the fourth sphere of radius cpb centered in the base station, where C is the speed of light, R1 - pseudodominant associated with the first satellite and the wireless unit, P2 - pseudodominant associated with the second satellite and the wireless unit, and P3 - pseudodominant associated with the third satellite and wireless unit.

Note that, if between the wireless unit and the base station there is a direct line-of-sight (in the absence of multipath propagation), then according to the proposed approach requires measurements associated with only two satellites and one base station. Additional information from another base station, if available, can be used to further reduce the number of required satellites. In addition, in cases where you only need to define two-dimensional position, using only two satellites and one base station.

An important advantage of this approach compared to other known approaches using SSE performance is determining the pseudorange wireless unit. Since the serving base station has its own receiver GPS, and knows the pseudorange all tracked satellites relative to the location of the serving base station can ODA is on the wireless unit to speed up the search process.

Thus, the on-Board clock of each satellite SHG control bronirovanie broadcast satellite signal to determine range. Such a clock synchronized with the system time of SHGs. The base station also includes a clock that is synchronized with the system time of SHGs. The wireless unit synchronizes its clock with the time in the SHG system with a delay corresponding to the delay one-way signal flow between the base station and the wireless unit. Information bronirovania is introduced in the signal determining the distance of the satellite, which allows the wireless unit to calculate, when it passed to the signal from the particular satellite. Registering the time when it passed the signal, it is possible to calculate the distance (range) from the satellite to the wireless unit. In the locus of the points of location of the wireless unit is a sphere with its center corresponding to the location of the satellite, and a radius equal to the calculated distance. If the measurement is simultaneously made with the use of determining the distance of two more satellites, the wireless unit is provided on the surface of the three spheres. Three spheres intersect in two points, however, only one of the points the Dag relative to the plane passing through three satellites.

In the best embodiment, the invention provides identification of a base station of the three "best" GSP satellites to determine the location of the wireless unit in a given time. This information is transmitted to the wireless unit to facilitate search operations carried out by the wireless unit.

According to one variant of implementation of the wireless unit can operate in several modes:

(1) Mixed mode involving the use of information from the wireless infrastructure systems, and satellites SHGs;

(2) Offline (standard or conventional) mode SHGs;

(3) Offline SSE support;

(4) Inverse-differential mode SHGs; and

(5) the Inverse differential mode SSE support.

Brief description of drawings

Fig. 1 is a diagram illustrative of a variant of implementation of the base station and the wireless unit of the wireless communication system (mdcr).

Fig. 2 is a block diagram illustrative cellular telephone system mdcr.

Fig. 3 is a simplified diagram of a base station in accordance with the principles of the present invention.

Fig. 4 is a block diagram of a wireless power system opredelenn diagram illustrative of a variant of implementation of the receive path, electronic circuits of the interface control signal, the digital if wireless wireless demodulator block corresponding to the present invention.

Fig. 6 is an illustration of a functional model of the location of the wireless unit.

Fig. 7 is a geometric representation of the calculation of the size and center the search window in the time domain.

Fig. 8 is a diagram illustrating the correction of the shift of the local clock.

Detailed description of the invention

The following is a description of illustrative embodiments with reference to the accompanying drawings.

Although the present invention is described here with reference to the example embodiments of for particular applications, it should be borne in mind that the invention is not limited to them. For specialists in this field on the basis of the stated principles of the invention, obvious modifications, applications and embodiments of, and additional applications in which the present invention could provide advantages.

In Fig. 1 shows a diagram illustrating the base station 10 and the wireless unit 20 wireless communication systems (mdcr). The communication system is surrounded by buildings 40 and ground obstructions 50. Batelco satellites SHG of which is shown four: 60, 70, 80 and 90. Such environment SHGs are well known. See, for example, Hofmann-Wellenhof, B., et al., GSP Theory and Practice, Second Edition, New York, NY: Springer-Verlag Wien, 1993. Specialists in this field it is obvious that the principles of the present invention can be applied to other communication systems, for example, Advanced mobile phone [AMPS], Global System for Mobile communications [GSM], etc. without altering the scope of the present invention.

In a typical application using SSE for the GSP receiver can determine its position that requires at least four satellites. However, the present invention provides a method and apparatus for determining the position of the wireless unit 20 using only three satellites SHG delay bilateral passage of signals from the wireless unit to the serving base station 10 and the known location of the serving base station 10. If there is a connection in the line of sight to determine the location of the wireless unit 20 requires only two satellites SHG delay bilateral signal and the known location of the serving base station 10.

In Fig. 2 shows a block diagram of a cellular tee base stations (KBS) 14. Telephone network (PSTN) 16 routes calls from the phone lines and other networks (not shown) to SMC 12 and back. SMC 12 routes calls from the PSTN 16 to the source base station 10 associated with the first cell 19 and the target base station 11 that is associated with the second cell 21, and back. In addition, SMC 12 routes calls between base stations 10, 11. The source base station 10 sends the call to the first wireless unit 20 located in the first cell 19, on the first route 28 communication. Route 28 connection is a bidirectional communication line with a straight line 31 connection and return line 32 connection. Usually, if the base station 10 has established voice communication with the wireless unit 20, the communication line 28 includes a channel graph. Although each base station 10, 11 is associated with only one cell, the base station controller often operates or is associated with base stations in multiple cells.

When the wireless unit 20 moves from the first cell 19 in the second cell 21, the wireless unit 20 starts to communicate with the base station associated with the second cell. This is usually referred to as “switching” to the target base station 11. The soft switching besprovodnoy source base station 10. After the transition of the wireless unit 20 to the second cell, and establishing lines of communication with the second cell of the wireless unit may disconnect the first communication line 28.

When hard switching operation of the source and target base stations are usually distinguished by the fact that the line 34 link to the source base station must be broken before it will be possible to establish a communication link with the target base station. For example, if the source base station belongs to the system mdcr using the first frequency band, and the target base station belongs to the second system mdcr using the second frequency band, the wireless unit can no longer keep the lines of communication with both base stations, since most of the wireless units is not able to tune at the same time on two different frequency bands. When moving the first wireless unit 20 from the first cell 19 in the second cell 21 line 28 communication from the source base station 10 is interrupted, and a new line of communication with the target base station 11.

In Fig. 3 illustrative simplified base station 10, made in accordance with the principles of the present invention. According to a variant implementation, predstavleniya base station 10 contains additional functionality which allow the base station to determine the position of the wireless unit 20, as shown in the following description. Conventional base station 10 includes a receiving antenna 42 mdcr for receiving signals mdcr and transmitting antenna mdcr for transmitting signals mdcr. The signals received by the antenna 42 is directed to the receiver 44. In practice, the receiver 44 includes a demodulator that converts premarital, decoders and other schemes, which is obvious to a person skilled in the art. The received signal in the corresponding channel that is associated with the detector 60 data rate. The CPU 62 controls uses the data rate detected signal to detect speech. If the CPU 62 controls detects speech in the current frame, it switches the received frame to the vocoder 64 through the switch 63. The vocoder 64 decodes the signal encoded with variable speed and produces a digitized output signal. Digitized decoded speech signal is converted to speech by a d / a Converter 65 and the output device, such as a loudspeaker (not shown).

The input speech signal from a microphone or other input device (not x 68. The encoded speech signal supplied to the transmitter 69. In practice, the transmitter 69 includes modulators, premarital and encoders, which is obvious to a person skilled in the art. The output signal of the transmitter 69 is fed into the transmitting antenna 43.

Conventional base station 10 also has an antenna 76 SSE, the receiver 74 and the block 72 bronirovania and frequency. The unit bronirovania and frequency receives signals from GSP-processor receiver SHGs and uses them to generate the reference signals bronirovania and frequency for proper operation of the system mdcr. Accordingly, in many such systems mdcr each node of the cellular communication uses the reference time signal system SHGs, of which all time-critical transmitted signals mdcr (including the sequence of the pilot signal, personnel and functions of the Walsh). Such common units bronirovania and frequency and SSE processors commonly used in systems mdcr and widely known in the art. Common blocks bronirovania and frequency generates the pulse frequency and information on bronirovaniju. However, the block 72 bronirovania and frequency corresponding to the present invention, preferably also gives elevation, pseudoallele, the identification of the satellite (i.e. DM is every companion what contributes to the discovery of the satellites of the wireless unit 20 (i.e., reduces the detection time of the satellite). This information is usually available in conventional units bronirovania and frequency, but usually does not require external devices and is not available to them. For more information, issued by the block 72 bronirovania and frequency, preferably transmitted in ASC 14 similarly as it is for the information of the frequency and bronirovania in the conventional base station.

Fig. 4 is a block diagram of the wireless unit 20 in accordance with one embodiments of the present invention. The wireless unit 20 preferably includes a bidirectional antenna 92 that receive as transmitted signals mdcr and SHG signals. According to the alternative implementation of the present invention for transmission and reception of signals SHG signals mdcr and other signals, for example signals of the alternative system, you can use separate antennas. Antenna 92 preferably sends a signal to the duplexer 94. The duplexer 94 preferably sends a signal to the receiver 100 and preferably receives a signal from the transmitter 200. Frequency-time subsystem 102 provides obvious to experts in the field of technology. The power control signal mdcr is provided by the circuit gain control 104. According to one of embodiments of the present invention, the interface control signal 300 is a digital signal processor (DSP).

Alternative interface control signal may represent a different scheme is able to perform the functions of the gain control. The interface control signal 300 generates control signals for the wireless unit 20. The receiver 100 converts with decreasing frequency (RF) signal and the first phase transformations with decreasing frequency signal to an intermediate frequency (if). Specialized integrated circuit (SIS) 400 digital processing of the inverter provides the second stage of the transformation and reduction of the intermediate frequency signal in the frequency band of the modulating signal, the sampling and a/d-conversion. SYSTEM 500 mobile demodulator searches and correlation processing of digital data in the frequency band of the modulating signal from the digital processing SYSTEM of the inverter, for receiving pseudorange, which is discussed in more detail below.

The pseudorange with any of the voice signal or data podiums the Oia with increasing frequency at the if data, received from the demodulator 500. The second stage conversion with increasing frequency FC and the transformation with increasing frequency on the high frequency of these signals is provided by the circuit of the transmitter 200. Then these signals are transmitted to the base station 10 and processed in accordance with the method corresponding to the invention, as described below. It should be noted that the information of the location to be transferred between the wireless unit 20 and ASC 14, such as pseudorange, accept wireless unit 20, is preferably transmitted to the wireless unit 20 to the base station 10 through the message packet type, an example of which can serve as a message service short message defined industry standard TIA/EIA/IS-167 established by the Association of telecommunications industry. These messages are transmitted via the base station 10 in ASC 14. Alternative re-defined message packet type can be transmitted by the wireless unit 20 to the base station 10.

In Fig. 5 presents a block diagram of an example implementation of the receive path, the electronic circuits of the interface control signal, digital processing of the inverter and demodulator of the wireless unit 20 corresponding to the present invention. Perodua, for brevity, is not considered here. According to a preferred variant implementation of the receiver 100 includes first and second channels, respectively, 103 and 105, which are connected to the antenna 92 through the duplexer 94 through the first switch 106. Professionals should be clear that there could be a higher degree of integration between duplex communication device and the receiver of SHGs. Alternative to achieve the objectives of the present invention can use two separate receivers with the appropriate interface.

The first channel 103 converts with decreasing frequency received RF signals mdcr and gives normal output signals mdcr, converted to a lower frequency. The first channel 103 includes a low noise amplifier 108, the first band-pass filter 112, the first mixer 118 and the second band-pass filter 126. The second channel 105 converts with decreasing frequency SHG signals coming from satellites SHG 60, 70, 80 and 90, shown in Fig. 1. The second channel 105 includes a second low noise amplifier 110, which outputs a signal on the third band-pass filter 114. The output signal of bandpass filter 114 is fed to the second mixer 120. The output signal of the second mixer is fed to the fourth band-pass filter 128. On the first local oscillators 122 and 124 operate at different frequencies under control of a dual-circuit phase-locked loop (PLL) 116. Dual PLL ensures that each local oscillators 122 and 124 provides a reference frequency for conversion with decreasing frequency as the received signal mdcr, in the case of the first mixer 118 and received signal GSP, in the case of the second mixer 120. The output signals of the second and fourth bandpass filters 126 and 128 are received at the first if-cascade 130 having a conventional structure.

The output signal of the inverter-demodulator 130 is supplied to the second switch 402 in the SYSTEM 400 digital processing of the inverter. The first and second switches 106 and 402 are running interface control signal 300 in the direction of a received signal to output the processed speech signal or data in normal mode mdcr or processing of the corresponding system of SHGs through the third mixer 404 fifth bandpass filter 406, circuit automatic gain control 408 and analog-to-digital Converter 410. The second input of the third mixer 404 represents the output signal of the local oscillator. The mixer 404 converts the received signal in the frequency band of the modulating signal. Filtered, adjusted to strengthen the signal is fed to analog-to-digital Converter (ADC) 410. The output signal of the ADC 410 includes first the data signals being received by the digital signal processor 520, which handles the SHG signal and generates the pseudorange information necessary to determine the position.

According to the alternative implementation of the present invention the outputs of the two bandpass filters 126, 128 are received on a dedicated integrated circuit (CID) processing in the frequency band of the modulating signal, which performs digital conversion of the intermediate frequency signals generated by the filters 126, 128 of the main bands in the frequency band of the modulating signal and produces a stream of digital values, which represents the quadrature and in-phase signals of the frequency band of the modulating signal. These signals are then fed to the block search. The search block is essentially identical to the conventional units used in demodulators mdcr. However, preferably used the search block is programmable, which provides search as a PN code associated with the signals mdcr transmitted from the base station, and PSH-code associated with the satellites of SHGs. Block search selective channels mdcr when receiving signals mdcr from the base station, and SSE determines the satellite SHGs, which are transmitted SHG signals. In addition, when the detection signal SSE block search indicated the marks satellites, from which signals that it is obvious to experts in the field of technology.

It is also clear that the process of double conversion, such as shown in Fig. 5, or alternatively a single conversion method if sampling can be used to obtain the necessary samples I and Q. in Addition, the structure of a variant implementation, shown in Fig. 5, permits a variety of modifications that do not change the essence of the present invention. For example, instead of DSPS, which is shown in Fig. 5, it is possible to use a conventional programmable processor. The memory 510 may not be required if the speed data in the system is such that the buffers are not required. Band-pass filter 406 and circuit 408 automatic gain control can be excluded or modified under certain conditions, implemented using digital or analog methods. Many other such variations on the structure depicted in Fig. 5, can be done without affecting the essence of the invention. In addition, it should be noted that alternative implementations may to a greater or lesser extent to provide for the joint use of GPS and wireless receiver hardware and programme oedema invention.

During operation according to the method corresponding to the invention, ASC 14 requests information SHGs at the control processor 62 (Fig. 3) included in the base station 10. This information includes, without any limitation, all the satellites at any given time in the sector transceiver 74 SSE (Fig. 3), elevation, Doppler shift and the pseudorange at this point in time. Note that the receiver SHG, which is part of the base station 10 has updated information, location, frequency, and PSH-shift for each satellite in the sector, because it tracks all satellites in the sector. Alternative base station 10 may transmit the data corresponding to the subset of only those satellites that may be in the sector of the wireless unit 20, taking into account the fact that the base station 10 stores information relating to the width of the street and the height of the surrounding buildings. Thus, if the base station 10 is able to determine that the observation of one or more satellites of the wireless unit is difficult, then the base station 10 will not transmit the information on the satellites, observation which satr the internal clock of the receiver SHGs. However, the internal clock of the receiver SHG accurately synchronized with the “true” time system SHGs. Therefore, the receiver cannot know the “true” time SHG system for receiving satellite signals. Later the navigation algorithm corrects this error by using the fourth satellite. Thus, if the clock included in the receiver, were precisely synchronized with the clock on each satellite, the conventional receiver SHGs would require only three satellites to determine the exact position of the receiver. However, because the clock of the receiver is accurately synchronized with the satellite clock, additional information is needed. This additional information provided by the reception time of the reception signal of the fourth satellite in the receiver. This stems from the fact that there are four equations (one for each of the four satellites) with four unknowns, which you want to search (i.e., coordinates x, y and z receiver and clock error of the receiver). Therefore, for three-dimensional solutions in the usual receiver SHGs are required to produce at least four measurements for four different satellites.

However, the present invention provides for the use of the ground station, which is the base station mdcr. Professionals should be clear that the base station mdcr synchronized with the system time of SHGs. In addition, all wireless units, which communicate through the base station mdcr using Protocol mdcr, also synchronized with the system time of SHGs with the shift, which is unique for each wireless unit 20. The time shift is equal to one-way delay caused by the propagation of the radio signal from the antenna of the base station to the antenna of the wireless unit. This is due to the fact that the wireless unit synchronizes its clock, taking from the base station index time system SHGs. However, while this pointer will be passed by the wireless unit, he gets an error equal to the propagation delay of the signal from the base station to the wireless unit. This propagation delay can be determined by measuring the travel time of the signal in both directions between the base station and the wireless unit. One-way delay will be equal to half duplex delay. Specialists in this field there are different ways to measure round-trip times.

In addition, the distance between the base station 10 and the wireless unit 20 moimoi visibility (LKP) between the base station 10 and the wireless unit 20 requires only two measurements of the distance of the satellite and one measurement range of the base station. In the absence of LKP between the base station and the wireless unit to calculate three-dimensional position required three satellite measurements and one dimension of bilateral delay. To adjust the extra distance made additional delay due to multipath propagation, additional satellite measurement. To correct errors of hours in the wireless unit uses two-way delay.

Described here allows the system to determine the position of the valid wireless unit mdcr at any time using the Function of the Positioning of the Wireless unit (FTU) 18 (Fig.6), while the wireless unit 20 is located in the service area of a radio network mdcr and while the network mdcr provides sufficient quality of service. The process of determining the position of the wireless unit can be initiated by the wireless unit 20, a network or external object, such as an internal Application 17 of the Location, the external Application 15 Location or Application 13 emergency services. Each of these components 13, 15 and 17 may be either hardware or software that is capable for the 17 is a terminal, connected to ASC 14, which allows the operator to directly request and receive information of the location of the wireless unit 20. Alternative application 17 is an application program executed by the processor included in the CCM 12.

FPB 18 preferably is a conventional programmable processor capable of receiving the raw data received from the wireless unit and from the satellites (i.e., pseudorange two satellites, the distance from the wireless unit to the base station and the correction factor at a time) and to calculate the position of the wireless unit. However, you can use any device that is able to obtain the information necessary to calculate the location of the wireless unit 20 based on such received information, and output information of the location. For example, the FPB 18 may be implemented as a SYSTEM, discrete logic circuits, finite state machine, or an application program in another network device (e.g., ASC 14). In addition, FPB 18 can be accommodated in the base station 10, ASC 14 or elsewhere on the CCM 12. Preferably, the FPB 18 is an application program that runs prednaznachen the m normal components there is no need to significantly modify the base station 10, ASC 14 and 12 SMC. Alternative FPB 18 may be an application program executed by the processor included in the ASC 14. FPB 18 preferably communicates with ASC 14 through the communication port, similar to that used conventional metering functions, administrative functions, functions register the source location register location “visitor” and other auxiliary functions, which are implemented by a processor, connected to the usual KBS.

The algorithm used for calculating the position presented in: Parkinson, B. W. and Spilker, J. J., Editors, Global Positioning System: Theory and Applications, Volume. I, American Institute of Aeronautics and Astronautics Inc., Washington DC, 1996), and volume II outlines how to perform differential correction SHGs. Professionals it is clear that such a correction may need to be done by the FPB 18 to accurately calculate the position of the wireless unit.

In accordance with one embodiments of the present invention, the service provider may limit services positioning, depending on certain conditions, for example, efficiency, reliability profiles, services, etc. Services location can support each Il the unit (FTU).

(2) a Request for positioning initiated by the network(isn).

(3) Positioning allowed depending on services (DLA): a wireless unit provides an external application temporary permit positioning of the unit in order to provide certain services.

(4) Positioning identity /non-identity of the wireless unit (PSI/BRP): will position all wireless units in a given geographic area. PSI will provide the identity and location of these blocks, while the BRP will be issued only by their whereabouts.

(5) Positioning in a closed group (PSG): allows you to create groups that can be defined in a special law on positioning (group control) (table).

According to one of embodiments of the present invention, in which the wireless unit 20 sends a query to determine the position of the wireless unit 20, it sends a request for positioning in CCA 12. SMC 12 validates the request to ensure that the wireless unit 20 is a subscriber of the requested type of service. Then SMC 12 sends the service request to the servicing ASC 14 on the treatment of information security positioning. Serving base station 10 responds to the request by transmitting the list of satellites in the sector, their Doppler shift, rate of change of the Doppler frequency, the pseudorange, the elevation angles of the signal-to - noise ratio (SNR) and bilateral delay existing between the wireless unit and the serving base station. Note that the GSP receiver 74 in the base station 10 continuously monitors the satellites in the sector, and therefore may have updated information on these parameters. ASC 14 uses CAH, pseudoallele, the elevation angle of the satellite, the Doppler shift and the rate of change of the Doppler frequency for each satellite to calculate the center of the window, the search window size and search time, and frequency, as follows (see also Fig. 7).

In the time domain center the search window for the i-th spacecraft (KAi) is equal to the pseudorange between the serving base station 10 and KAi, b in Fig 7. The size of the search window for KAi equal bilateral delay multiplied by cos(_i), where cos(_i) is the cosine of the elevation angle of the satellite relative to the Earth's radius, which begins in the center of the Earth and passes through the receiver.

In the frequency domain center the search window for Kai equal to fo+fdi, i is equal to the uncertainty in frequency, due to the frequency error of the receiver and the rate of change of the Doppler frequency. ASC 14 transmits information, which includes the satellites in the sector, centres and the size of the search window in time and frequency and the minimum number of satellites required for positioning of the wireless unit 20.

According to one of embodiments a message received at the wireless unit 20 will trigger a signal to reconfigure the wireless unit 20. The message may also provide a “trigger point” (one point or another in the future, when the receiver is tuned to the receiver frequency SHG). In response, the wireless unit 20 will activate the first and second switches 106 and 402 at the time of activation (Fig. 5) and, thus, to tune to the frequency of the SHGs. SYSTEM 400 digital processing on FC switches its PN generator (not shown) in the SHG mode and starts searching for all the satellites specified.

Finding the minimum number of required satellites, wireless unit 20 computes a pseudorange based on the system time of SHGs, members of the wireless unit 20, tuned to the frequency of the communication system and transmits the received pseudorange together with the ISM is 14. Search results of pilot signals is required if the unit cannot detect three satellites and there is no direct signal in the zone of direct visibility between the serving base station and the wireless unit 20. However, you can use less than three satellites, if using available information, such as information on the search for pilot signals, it is possible to calculate two-way delay for another device, such as another base station. Methods for the determination of bilateral delay on the basis of information search, the pilot signal is widely known in the art.

ASC 14 transmits the results of the pseudorange measurements made by the wireless unit 20, and the position of the serving base station 10, the corresponding measurement results of bilateral delay, the position (in space) of the respective satellites (relative to a given fixed coordinate system) and differential correction SHGs FPB 18, where the computation of the position of the wireless unit 20. The pseudorange obtained ASC 14 from the wireless unit 20 and transmitted to the FPB 18, measured in hours, members of the wireless unit 20. Therefore, they contain an error (i.e., shifted by the amount destroya, as the FPB 18 corrects the error of the local clock. In Fig. 8_1 represents pseudomallei (half duplex delay) when receiving signals transmitted from base station 10 to the wireless unit 20 and back; rm1, rm2 and rm3 - the pseudorange from the wireless unit to the first, second and third selected satellites SHGs, 60, 70 and 80, respectively. These measurements are made relative to the local clock included in the wireless unit 20. But because the local clocks are offset from real-time SHG system 1, the corrected pseudorange can be expressed as follows:

_1=_m1+_1

_2=_m2+_1

_3=_m3+_1

For calculating the position of the wireless unit 20 FPB 18 uses the above three equations, the position (in space) of the three satellites, the position of the serving base station and the corresponding measurement results CAH. Note that information on CAH exactly equivalent information on the error of the local clock of the wireless unit with respect to true time system SHGs. Thus, it is enough to solve three equations the distance to three satellites.

Note also that when there is a connection between the wireless unit 20 and the base station 10 in the zone of direct widgetstore of CAH between the wireless unit 20 and the base station 10, the minimum required number of satellites can be reduced to two. This number can also be reduced if you have information about other pilot signals (nodes). For example, if the wireless unit has established communication with two or more base stations (e.g., in the regime of “flexible” switch communication channels), neither of which is not in line of sight of the wireless unit 20, it is possible to calculate more than one bilateral delay and, consequently, for determining the position of the wireless unit 20 need only two satellites. Thus, calculations can be made on the basis of five equations (two equations for the two measurements of pseudorange associated with two companions, two equations for the two measurement results existing base stations and one equation relative to the crushing plant to the serving base station, which allows you to synchronize the local clock of the wireless unit 20 with a real time system SHGs). This is useful when observing satellites SHG difficult due to shading by buildings, trees, etc. in Addition, it reduces the search time satellites of SHGs. FPB 18 sends the calculated position in ASC 14, which transmits the maintain variants of implementation for specific applications. Specialists in the art should understand that various modifications and embodiments of the invention. Therefore, the attached claims of the invention includes in its scope all the possible applications, modifications and embodiments of the invention.

Claims

1. System for determining the position of the mobile wireless transceiver containing a base station, a means for calculating the Doppler shift of signals transmitted respectively from the first, second and third satellites, relative to the base station, means for calculating a first set of pseudorange respectively of the first and second satellites relative to that base station, means for transmitting information identifying satellites, information, Doppler shift and the above-mentioned information of the pseudorange between the base station and the wireless transceiver, the tool is placed in the wireless transceiver for receiving information identifying satellites, information, Doppler shift and pseudorange information from the base station means, posted in mobile wireless transceiver, for ispolzovaniem transceiver and the first and second satellites at time txtool, placed in a mobile wireless transceiver, for transmission to the base station of the second set of pseudorange between the transceiver and the first and second satellites, together with the time information txand the tool is placed on the base station, for calculating the position of a wireless transceiver in accordance with a second set of pseudorange and the above-mentioned time tx.

2. The system under item 1, characterized in that the said means are placed in the base station, for calculating the position of a wireless transceiver in accordance with a second set of pseudorange and the above-mentioned time txincludes means for determining the distance to the wireless transceiver from the base station.

3. The system under item 2, characterized in that the said means, placed on the base station, for calculating the position of the wireless transceiver includes means for using the distance to the wireless transceiver from the base station when calculating the position of the wireless transceiver.

4. The system under item 1, characterized in that it contains environments the system under item 1, characterized in that it contains means for switching a mobile wireless transceiver from the first mode to communicate using speech signal/data transmission in the second mode to determine its position.

6. The system under item 1, characterized in that the said means are placed in the base station, for calculating the position of the wireless transceiver includes means for using the second set of pseudorange to calculate a third set of pseudorange between the first and second satellites and the base station and the means for using the known positions of the two satellites at time txthe provisions of the base station, the third set of pseudorange and time-delay of arrival of a signal transmitted from a mobile wireless transceiver to the base station, to establish the position of the wireless transceiver.

7. The system under item 6, characterized in that the said means for calculating the position of the wireless transceiver includes means for finding the first intersection of the sphere with the center in the first of two satellites, a second sphere with the center in the second of the two satellites and critieria position of the wireless transceiver includes means for finding the first intersection of the sphere with the center in the first of two satellites, the second sphere with the center in the second of two satellites and a third of a sphere centered at the base station.

9. System for determining the position of the mobile wireless transceiver containing a base station, the tool is placed in the base station to identify the first and second satellites of the global positioning system, a means for calculating the Doppler shift of signals transmitted respectively from the first and second satellites, relative to the base station, means for calculating a first set of pseudorange respectively of the first and second satellites relative to the base station,means for transmitting information identifying satellites, information, Doppler shift and pseudorange information from the base station to the wireless transceiver, the tool is placed in the wireless transceiver for receiving information identifying satellites, information of Doppler shift and pseudorange information from the base station, the tool is placed in said mobile wireless transceiver to use the information received from the base station to identify a second set of pseudorange between these priemere the mobile wireless transceiver, for transmission to the base station of the second set of pseudorange between the transceiver and the first and second satellites, together with the time information txtool placed in the base station, for calculating the position of a wireless transceiver in accordance with a second set of pseudorange and time information txand the said means for calculating includes means for determining the distance to the wireless transceiver from the base station and the means to use the distance to the wireless transceiver from the base station when calculating the position of the wireless transceiver.

10. The system under item 9, characterized in that it contains means for switching said mobile wireless transceiver from the first mode to communicate using speech signal/data transmission in the second mode to determine its position.

11. The system under item 9, characterized in that the said means, placed on the base station, for calculating the position of the wireless transceiver includes means for using the second set of pseudorange to calculate tretia use of well-known positions of the first and second satellites at time txthe provisions of the base station, the third set of pseudorange and time-delay of arrival of a signal transmitted from a mobile wireless transceiver to the base station, to establish provisions mentioned wireless transceiver.

12. System on p. 11, characterized in that the said means for calculating the position of the wireless transceiver includes means for finding the first intersection of the sphere with the center in the first of two satellites, a second sphere with the center in the second of two satellites and a third of a sphere centered at the base station.

13. The system under item 9, characterized in that the said means for calculating the position of the wireless transceiver includes means for finding the first intersection of the sphere with the center in the first of two satellites, a second sphere with the center in the second of two satellites and a third of a sphere centered at the base station.

14. The method of determining the position of the mobile wireless transceiver, comprising the steps of calculating the Doppler shift of signals transmitted respectively from the first and second satellites, relative to the base station, computing a first set of pseudorange respectively Pervov the Doppler shift and pseudorange information from the base station to the wireless transceiver, receiving at the transceiver information identifying satellites, information, Doppler shift and pseudorange information from the base station, using information received from the base station to identify a second set of pseudorange between the transceiver and the first and second satellites at time txtransmission to the base station of the second set of pseudorange between the transceiver and the first and second satellites, together with information about the time txand calculating the position of the wireless transceiver in accordance with a second set of pseudorange and time information tx.

15. The method according to p. 14, wherein the step of calculating the position of the wireless transceiver in accordance with a second set of pseudorange and time information txincludes the step of determining the distance to the wireless transceiver from the base station.

16. The method according to p. 15, wherein the step of calculating the position of the wireless transceiver includes the step of using the distance between the wireless transceiver and the base station when calculating the position of the wireless primape positioning.

18. The method according to p. 14, characterized in that it includes the step of switching the mobile wireless transceiver from the first mode to communicate using speech signal/data transmission in the second mode to determine its position.

19. The method according to p. 14, wherein the step of calculating the position of the wireless transceiver includes the steps of using the second set of pseudorange to calculate a third set of pseudorange between the first and second satellites and the base station and using the known positions of the two satellites at time txthe provisions of the base station, the third set of pseudorange and time-delay of arrival of a signal transmitted from a mobile wireless transceiver to the base station, to establish the position of the wireless transceiver.

20. The method according to p. 19, wherein the step of calculating the position of the wireless transceiver includes a step of finding the first intersection of the sphere with the center in the first of two satellites, a second sphere with the center in the second of two satellites and a third of a sphere centered at the base station.

21. The method according to p. 14, wherein the step of calculating the PM in the first of two satellites, the second sphere with the center in the second of two satellites and a third of a sphere centered at the base station.

 

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