Method of finding location of mobile station

FIELD: radiolocation.

SUBSTANCE: method can be used in cellular communication systems for finding location of mobile station. Maximal precision of location is achieved at minimal total energy of signals transmitted during location procedure. Correction of errors is provided which errors relate to absence of signal propagation direct beam. Decision of location completeness is made upon forming estimation of coordinates of mobile station. For the purpose the data is used which are available at any base station immediately after reception of location signal as well as estimations of coordinates formed later. Moreover, step of correction of measured times of arrival of location signal is introduced to correct errors. Correction is based upon detecting of absence of propagation direct beam and on subtracting value of compensation being proportional to average radius r of area of objects of dissipation close to mobile station.

EFFECT: increased precision.

5 cl, 8 dwg

 

The present invention relates to the field of radar and can be used in cellular communication systems to determine the location of the mobile station.

The constant expansion of services in mobile cellular communication systems makes it relevant to solving the problem of determining the location of a mobile subscriber station (MS). Currently, the location of the object is performed using estimates of parameters of signals propagating between the MS and each of the multiple base stations (BS). As the measured parameters often use the arrival time of the signal. The measured parameters and the known coordinates of each of the BS make it possible to calculate the coordinates of the MC. Examples of such methods location can serve as the methods described in the works: "Wireless Location in CDMA Cellular Radio Systems" by James J.Gaffery Jr./University of Cincinnati/ Cincinnati, OH, USA. / Kluwer Academic Publishers. 2000. / Electronic Services: http://www.wkap.nl, Sections 1.3.1, 2.1[1]; "Subscriber location in CDMA cellular networks" by J. Gaffery,/ IEEE transactions on vehicular technology, vol.47, no. 2, may 1998 [2]; patent: WO 98/14018 "Method and system for mobile location estimation" by M. Wylie, April 2, 1998 [3]; US 5732354: "Method and apparatus for determining the location of mobile telephone", March 24, 998 [4]; US 5736964 "Method and apparatus for location finding in a CDMA system", April 7, 997 [5]; US 6161018. "Method and System for Estimating a Subscriber''s Location in a Wireless Communication System Service Area", Motorola, Inc., Dec. 12, 2000 [6].

In cellular communication systems location can be performed on signals, spread anaysis from the MS to the BS, that is, on the direct channel and the backward channel. A serious problem is the problem of visibility. When significant removal of some BS from the object location, the level of the corresponding signal at the receiver input is low and insufficient to estimate the time of its distribution. In cellular communication systems with code division multiplexing (CDMA), such as IS-95, 3GPP2, there is a regime of power adjustment, which is provided in the system of the communication modes is not possible to increase the signal strength to perform location.

One way of solving this problem consists in the fact that it was making a location on the backward channel from the MS to the BS. At MS command instructing it to increase capacity. This procedure is provided, for example, in solution [5]. In cases of emergency calls is encouraged to increase the power of the signal MC. The disadvantage of this solution is a significant increase in the level of interference signal locations, as in communication systems with code division multiplexing (CDMA) signals of different users are a hindrance to each other.

To limit the interference level during locating resort to a special procedure in which the MS transmits a sequence of short beeps with increasing power. With the possibility of beginning the th transmission from a low level and increase it from signal to signal to achieve the necessary level. In the standard IS-95 this procedure is called "increasing function of the Power Up Function), abbreviated PUF, a transmitted signal - PUF samples (see standard IS-95. TIA/EIA IS-95. "Mobile Station-Base Station Compatibility Standard for Dual-Mode Wideband Spread Spectrum Cellular Systems". Telecommunication Industry Association, July 1993)[7]. However, in the absence of an appropriate control algorithm, the noise level during the procedure, the location will be saved, and might even increase.

Another serious problem location is measurement error in time of arrival of a signal associated with the absence of direct beam propagation. In this case, at the receiving end there is only the signal reflected from any obstacles and past distance greater than the distance between stations. If the error is associated with noise or fading can be reduced to the desired level by increasing the power of the transmitted signal, the error associated with the absence of direct beam is maintained at a high power level signal. Therefore, one of the most important aspects of the fight against errors in determining the location of the MS is the minimization of the error location associated with the absence of direct beam in the distribution channel.

One way to improve the accuracy of location in the absence of direct beam propagation is described in document [3]. In this way affords the tsya during location to determine the presence or absence of direct beam and in accordance with the decision to perform the correction of the measurements. To this end, each of the base stations participating in the location, is a sequence of measurements of the distance to the MC. The decisive quantity for determining the presence or absence of direct beam distribution is proposed to use the value of variance estimates of these measurements. The obtained value of the variance is compared with a threshold, which is the variance due to noise. If the critical value exceeds the threshold, then a decision is made about the lack of direct beam. In the same paper [3] proposes a method for correcting measurements in the case of a decision about the absence of direct beam.

The disadvantage of this solution is that the decision about the absence of direct beam based on the degree of deviation from the average value of the measured estimates of distances. However, there are situations when large deviations will not be even in the absence of direct beam. This situation may arise, for example, at locations on the terrain with uniform building in an urban environment. In such conditions, the accuracy of this method is low. Another disadvantage of this solution is a great time necessary for carrying out location. This is because the detection of the absence of direct beam is carried out according to the results of continuous measurement of the distance. Such measurements require a lot. In CA the arts, given in [3]it is stated that the sequence of 100-200 measurements.

Closest to the claimed solution is the way locations described in the patent US 5903844 "Method and apparatus for determining remote unit location in a communication system Motorola, Inc., May 11, 1999 [8], which consists in the following:

- choose the active BS, who will participate in determining the location of the MS,

- pass on the MC command to initiate the transfer signal sequence location, with the necessary parameters of this sequence (for example, the start time of the transmission power of the first signal sequence, a step of increasing power)

- transfer to the active BS command to start the reception signal sequence locations, at this point the relevant parameters of this sequence, and begin the process of identifying the location of the MS, while

- MS form and transmit the sequence of locations in accordance with the received parameters;

at each active BS consistently take each of the sequence of the signals of location and form an estimate of the time of his coming,

- determine the location of the MS,

after receiving and forming estimates the time of arrival of each signal location on all BS, decide on the completion or continuation of the procedure of determining the location of the MS, while

- if you decided to proceed, then resume the procedure of positioning

- if the decision is made on completion of the procedure, determine the location of the MS and complete the procedure, passing on the MC command on the termination of signal transmission location and the generated estimate of the location.

The disadvantage of this algorithm is, first, imperfect organization procedures. The criterion for completion of the location serves as a criterion for the adequacy of the collected data, which is determined immediately after the evaluation time of signal arrival locations on each of the BS.

Acceptance at this stage, decisions about the adequacy of the collected data may be erroneous. This is because the resulting error location depends on many factors: the distribution terms, the method of forming the estimates of the coordinates of the position of the MS relative to the BS. The influence of these factors on the accuracy of the locations may best be taken into account when the decision on the adequacy of the data collected is based on the generated estimate of the location. This can only be performed after the formation of this evaluation.

For example, the decision about the adequacy of the collected data is received by the signal-to-noise ratio, so that if the signal-to-noise ratio exceeds threshold on each of the base stations is, it has been decided that enough data and the procedure of positioning can be completed. When this threshold for the signal-to-noise ratio must be set to the worst-case propagation conditions in order to obtain the required accuracy of the location. In more favourable conditions will also be expected to achieve this high threshold. This will be given unreasonably high energy PUF samples.

Another disadvantage of this solution is the possibility of significant errors location. This is because the location is determined at the time of signal reception. However, in the absence of direct beam propagation time of signal reception location does not reflect the distance between MS and BS, as indirect beam passes a greater distance.

The objective of the invention is to achieve maximum efficiency, that is, the maximum precision of the location with the minimum total power of the signals transmitted during the procedure, and correction of errors associated with lack of direct beam propagation.

The problem is solved due to the fact that in the method of determining the location of MS [8], namely, that:

- choose the active BS, who will participate in determining the location of the MS,

- pass on the MC command to initiate the transfer of the placenta the successive signals locations at this point the necessary parameters of this sequence,

- transfer to the active BS command to start the reception signal sequence locations, at this point the relevant parameters of this sequence, and begin the process of identifying the location of the MS, while

- MS form and transmit the sequence of locations in accordance with the received parameters

at each active BS consistently take each of the sequence of the signals of location and form an estimate of the time of his coming,

- determine the location of the MS,

- decide on the completion or continuation of the procedure of determining the location of the MS, while

- if you decided to proceed, then resume positioning,

- if the decision is made on completion of the procedure, complete the procedure, passing on the MC command on the termination of signal transmission location and the generated estimate of the location.

Added the following operations:

- adjust the estimated time of arrival of a signal, while

- form estimation of the rice factor for a given signal location

- compare the estimation of the rice factor threshold,

- if the evaluation of the rice factor does not exceed the threshold, then decide about the lack of direct beam on this BS and adjust the estimate time of arrival of a signal, forming a correction value proportional to the average radius of the zone of interest scattering about MS, and subtracting the correction value from the generated estimate the time of arrival of a signal locations

- if the assessment factor of rice exceeds the threshold, as adjusted using the generated estimate of the time of arrival of a signal locations

- the location of the MS is determined taking into account the adjusted estimated time of arrival of the signal locations of all active base stations,

- the decision on the completion or continuation of the procedure of determining the location of the MS to accept, given the results (precision set location).

Moreover, the estimation of the rice factor can be formed, for example, as the ratio of the mean square amplitude of the signal to the average squared deviation of the amplitude from the average value.

When receiving the first signal from the signal sequence of a location decision on completion of the procedure of determining the location of the MS take on estimates of the relationship of signal to interference if these estimates exceed the required threshold for each active BS, otherwise decide to proceed.

When receiving the second and subsequent signals from the signal sequence of locations obtained the estimate of the MS location is compared with the evaluation obtained by the previous signal, if Russ is the right between the two estimates is less than the threshold, then decide on the completion of the procedure, otherwise decide to proceed.

The threshold can be set based on the maximum possible movement of the MS for the interval between successive signals of a location.

Comparative analysis of methods of determining the location of the MS with the prototype shows that the claimed invention differs significantly from the prototype, as it allows to improve the accuracy of location of the MS in the absence of direct beam signal propagation and to correct inaccuracies of the positioning MILLISECONDS.

Analysis of other technical solutions in this field of technology has not led to the identification of signs, similar to those described in this description and in the characterizing part of the claims.

Graphics illustrating this invention:

Figure 1 - example of mobile cellular communication.

Figure 2 - block diagram of the device performing the location.

Figure 3 - algorithm of the proposed method for determining

location MILLISECONDS.

4 is an embodiment of the device location BS.

5 is an embodiment of the correlator.

6 is a algorithm of block assessment factor of rice.

Fig.7 - the algorithm of the correction block.

Fig - embodiment of the Central unit location.

- choose the active BS, who will participate in determining the location of the MS,

- transmit to the mobile station a command to initiate the transfer signal sequence location, with the necessary parameters of this sequence (for example, the start time of the transmission power of the first signal sequence, the step of increasing power)

- pass on the active base station a command to start the reception signal sequence locations, at this point the relevant parameters of this sequence, and begin the process of identifying the location of a mobile subscriber, with

- on mobile station generates and transmits a sequence of locations in accordance with the received parameters

at each active base station sequentially taking each of the sequence of the signals of location and form an estimate of the time of his coming,

- adjust the estimated time of arrival of a signal, while

- form estimation of the rice factor for a given signal location

- compare the estimation of the rice factor threshold,

- if the evaluation of the rice factor does not exceed the threshold, then decide about the lack of direct beam in the base station and adjusting the time of arrival of a signal, forming a correction value proportional to the average Radisson objects scattering around the mobile station, and subtracting the correction value from the generated estimate the time of arrival of a signal locations

- if the assessment factor of rice exceeds the threshold, as adjusted using the generated estimate of the time of arrival of a signal locations

- the location of the mobile station is determined taking into account the adjusted estimated time of arrival of the signal locations of all active base stations,

- given the specific location, decide on the completion or continuation of the procedure of determining the location of a mobile subscriber, with

- if you decided to proceed, then resume positioning,

- if the decision is made on completion of the procedure, complete the procedure, transmitting to the mobile station a command to interrupt transmission of the signals of location and formed the assessment location.

Estimation of the rice factor can be formed, for example, as the ratio of the mean square amplitude of the signal to the average squared deviation of the amplitude from the average value.

When receiving the first signal from the signal sequence of a location decision on completion of the procedure of determining the location of the MS take on estimates of the relationship of signal to interference if these estimates exceed the required threshold for each active BS, otherwise take resheniia the continuation of the procedure.

When receiving the second and subsequent signals from the signal sequence of locations obtained the estimate of the MS location is compared with the evaluation obtained by the previous signal, if the distance between the two estimates is less than the threshold, then decide on the completion of the procedure, otherwise decide to proceed.

The threshold can be set based on the maximum possible movement of the MS for the interval between successive signals of a location.

The proposed method of determining the location of the MS is applicable in the system of mobile communications (Figure 1), which consists of several base stations (BS,...BS) with a fixed location and mobile subscriber station (MS). Between MS and BS can be used to exchange messages. An example of such a system can serve as a modern system of the cellular mobile radiotelephone described in the standard IS-95 (TIA/EIA IS-95 Mobile Station-Base Station Compatibility Standard for Dual-Mode Wideband Spread Spectrum Cellular Systems". Telecommunication Industry Association, July 1993)[9]. In this standard to determine the location of the MS establishes procedures PUF.

During the procedure, PUF MS transmits a sequence of short beeps with increasing power. If there is an opportunity to begin the process of locating on the low power signal and to increase the power from the signal si is Nala to achieve the necessary level. The transmitted signals locations are called "PUF samples". Implementation of the proposed method it is possible on the basis of such procedures PUF. Figure 2 presents a functional diagram of the device performing the location. In determining the location of the MS involved device location 3 each of the BS, receiving the signals from the outputs of the respective transceivers 2, the Central device location 4, and the transceiver 1 MS shaping and transmitting location signals. Location Central location 4 depends on the structure of the system. For example, it can be located in the control center BS. Between the Central device 4 and device locations 3 BS assumes that the exchange of messages via radio or cable.

The implementation algorithm of the proposed method is presented schematically in figure 3.

When entering the Central device 4 of the query to determine the location of any MS selects the active BS, that is, those who will participate in the location. One of the active BS is, as a rule, the BS serving this MC. Other BS, the most suitable for participation in the location, you can determine, for example, estimates of capacity transferred their pilot signals and the time distribution of these pilot signals to the MC. These measurements are performed on the MC process PE is ehoda MS from the coverage area of one BS to another. In the standard IS - V this procedure is called by the English term "Handoff (see EA/TA/IS-95 Mobile Station-Base Station Compatibility Standard for Dual-Mode Wideband Spread Spectrum Cellular Systems") [10]. The measurement results are transmitted to the service BS and stored in the database. When selecting the active BS to participate in location preference should be given to the BS with the highest power level of the pilot signal and the least amount of time of its distribution.

After selecting the active BS Central unit location 4 generates and transmits to the MS a message with a command to initiate the transfer sequence PUF samples. It includes the necessary parameters of this sequence: the capacity of the first sample, the step of increasing power, the number of samples, the interval between samples. The parameters can be determined in accordance with the international standard [10].

At the same time on the active cell broadcast messages are sent with the command to start the sequence PUF samples and also specify the appropriate parameters of this sequence. MS, after receiving a command, transmits the sequence of the PUF samples. Generating and transmitting such signals location can also be performed according to IS-95 [10].

On each of the cell broadcast function location is performed by a device location 3, an embodiment of which is shown in figure 4. In this implementation, the device location 3 rossmar is by case when the processing is done in the field of zero frequency. This can be applied to digital signal processing methods. In the field of zero-frequency signal represented in the form of in-phase and quadrature components I and Q (See for example, Andrew J.Viterbi "CDMA Principles of Spread Spectrum Communication". Addison-Wesley Communication Series. 1995) [11]. Processing the input signal at the radio frequency, the transfer in the region of the zero frequency and the digitization is performed in the transceiver 2. In-phase and quadrature signals I and Q from the output of the transceiver 2 is fed to the input device location 3.

On each of the BS sequentially receive each signal sequence and estimate the time delay. To estimate the time delay of the signal location is performed by the evaluation unit delay 6. In the evaluation unit delay 6 may be implemented by any known method that is used to search and synchronization in communication systems (See. for example, V. I. Zhuravlev. Search and synchronization in wideband systems. M.: Radio and communication, 1986) [12].

Evaluation of the time τedelay generated at the output of the evaluation unit delay 6, to the input of the correction unit 9. For the correct evaluation of the delay device location 3 BS (Figure 4) are used: the correction block 9, the correlator 5 and the evaluation unit factor rice 8.

The principle of correction based on the detection of the absence of direct l is cha, performed assessment factor of rice. Factor or the ratio of rice called the ratio of the power reflected component to the power of the scattered component (See. "Parallel acquisition of Spread-Spectrum Signals with Antenna Diversity" by R.R.Rick and L.B.Milstein IEEE Trans on Comm. Vol. 45. NO. 8. August 1997 [12], and www.deas.harvard.edu/~jones/csciel 29/prop_models/propagation.html [13]). Estimation of the rice factor can serve as an indicator of the absence of direct beam propagation. Because in the absence of direct beam signal typically has a large part of the scattered component and, conversely, when the direct beam is increased relative proportion of the reflected component, which leads to a change in the value of the rice factor. Thus, the decision about the absence of direct beam can be made if the evaluation value To below a certain threshold.

Estimation of the rice factor can be formed on the basis of the following provisions. The mean square amplitude of the signal and the variance is expressed in terms of the factor of rice To the following formula from [12]

Here A2 and σ2 - distribution parameters determining the average amplitude of the signal variance; F/O - signal-to-noise ratio; K is the rice factor. From these expressions it is seen that an approximate estimation of the rice factor K at E/A>>1 can be obtained asor

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where E () and E(A2) - average values for the amplitude and the square of the amplitude of the signal, respectively. Constant coefficient in this formula is omitted, since this estimate is compared with a threshold and any ratio can be accounted for by appropriate choice of threshold. Thus, for estimation of the rice factor is necessary to obtain a sequence of estimates of the amplitude of the signal A, and then to form the relation (2).

To construct a sequence of estimates of the amplitude of the signal is the correlator 5, a block diagram of which is shown in figure 5. The correlator 5 consists of a reference signal generator 10, the delay control 12, the complex multiplier 11, the two cumulative adders 13 and 14, the evaluation unit amplitude 15.

Amplitude estimation signal is generated in the correlator 5 as follows. The delay reference signal generator 10 is installed in accordance with the appraisal τeobtained in the evaluation unit delay 6. The samples in-phase and quadrature signal components I and Q are multiplied with the corresponding samples in-phase and quadrature components of the reference signal Ir and Qr. The multiplication is carried out according to the rules of multiplication of complex numbers such that the two outputs of the complex multiplier 11 are formed real and imaginary parts of the complex work (I+i·Q)·(Ir+i·Qr) are appropriate to estwenno

The sequence of samples of each of these signals is summarized in the corresponding cumulative adder 13 or 14. The sum is performed on the coherence interval of the input signal. For signals PUF samples IS-95 this interval is the period 208,333 ISS. In the standard IS-95, it corresponds to the period of the modulating functions Walsh. The output values of the cumulative adders 13 and 14, X, Y is fed to the input of the evaluation unit of the amplitude of the signal 15. The algorithm of work of the evaluation unit amplitude corresponds to the formula

Assessment And formed at successive intervals of coherence, is fed to the input of the evaluation unit of the rice factor 8. The algorithm of work of the evaluation unit of the coefficient Raisa 8 presents figure 6 and can be implemented programmatically. The algorithm consists in computing the values ofand then the formation of the assessment of the rice factor K in accordance with formula (2). In these expressions, M is the number of samples amplitude, participating in formation of an assessment factor of rice.

Formed the estimation of the factor of rice to the input of the correction unit 9. The algorithm of the correction block 9 7. Estimation of the rice factor is compared with a threshold KTHR. The threshold can be chosen experimentally (with field testing or simulation) and the mouth is oflen constant. If the estimation of the rice factor does not exceed the threshold, then a decision is made about the lack of direct beam and the need for correction formed evaluate lag τe.

It is known that the error in distance measurement due to the lack of direct beam spreading caused by the radius of the zone of interest scattering around the mobile station (see[2]). Therefore, as the quantity of compensation you can receive an amount proportional to the radius of the area of interest scattering:

Δt=a·r.

Estimation of the radius of the scattering objects r about MS can be performed based on known maps cell system and at a rough estimate of the MS location. Thus, a corrected estimate of the time delay: τce+Δt.

If the estimation of the rice factor exceeds the threshold, then the decision about the absence of direct beam and the necessary correction is not accepted and the output of the correction block is passed the assessment generated in the evaluation unit delay τce.

Thus, formed adjusted estimate the time delay PUF samples on each of the active base stations. Revised estimates of delay are transmitted to the Central unit location 8.

The structure of the device location BS 3 also includes the evaluation unit of the signal-to-interference 7. This is about the child uses in the Central device location 8 for a decision on the completion location.

The algorithm of work of the evaluation unit of the signal-to-interference 7 may be as follows. Estimation of the signal power can be obtained by the amplitude of the signal generated at the output of the correlator 5. Estimation of the interference power can be also formed by using a correlator 5 (figure 5). In this case, the delay of the reference signal generator 10 must consistently set at different values, different from assessing τemore than the duration of one elementary symbol. Each time should be measured And the output of the evaluation unit amplitude 15. Summing quadratic amplitude value and dividing by the number of measurements, we can estimate the interference power. Attitude is formed so that estimates of the capacity of the signal and noise will give a good signal-to-noise ratio.

Embodiment of the Central unit location 8 presents on Fig. It consists of an evaluation unit coordinates 16, block a decision on the completion of locations 17 and control unit 18.

To the input of the evaluation unit coordinates 16 MS receives the adjusted estimate the time delay PUF samples formed on each of the base stations, as well as the coordinates of the BS. In the communication system IS-95 base station operate synchronously. Therefore, the time delay PUF samples measured at each of them represents the propagation time of the signal from the s to the corresponding base station. To determine the coordinates can be used any known method, for example, the method of crossing circles or hyperbole [1], or a method of minimizing the root mean square error [2].

After forming the estimates of the coordinates of the MS decide to completion or continuation of the procedure location.

This decision is made in block a decision on the completion of locations 17. When deciding on completion of locations you need to consider two opposite requirements: 1) the accuracy of the location, 2) to minimize interference from a sequence of locations. Based on these considerations, the transfer of the PUF samples must be stopped, when a further increase in capacity of the samples does not improve the accuracy of the estimate of the MS location.

This principle was implemented as one of the options in the following algorithm for deciding the end location.

1. Define the number of signal locations.

2. If the signal location first, then evaluate the signal-to-noise ratio for each BS.

If the signal-to-noise ratio exceeds the required threshold for all BS, then take the resulting estimate for the true coordinates of the MS and transmits to the MS a command to terminate the transmission signal sequence locations. Otherwise, continue to send and receive sequence signal is in the location.

3. If the signal location is not the first, then the assessment location is compared with the estimate obtained for the previous signal from the signal sequence of locations. If the distance between the estimated location of the MS is less than the threshold, then take the resulting estimate for the true coordinates of the MS and transmits to the MS a command to terminate the transmission signal sequence locations, the threshold may be set based on the maximum possible move for MS interval between samples.

Otherwise, i.e. if the distance between the estimated location of the MS above the threshold, continue to send and receive sequence locations. This algorithm takes into account the generated estimate of the location of the MS and reduces the total energy of the signals emitted during the location, irrespective of the conditions of signal propagation or generation of the estimated coordinates.

Controls the operation of the evaluation unit coordinates 16 and a decision on the completion of the location 17 of the control unit 18. The control unit 18, as a rule, is a controller with arbitrary number of inputs and outputs, which depends on the problem being solved. To perform such blocks can on modern processors of any type TMS sh, Motorolla 56 xxx, Intel, etc.

Thus, the inventive solution allows you to achieve maximum is effektivnosti, that is, the maximum precision of the location with the minimum total power of the signals transmitted during the procedure. This is due to the fact that, firstly, introduces the phase correction measurements of times of arrival of the signal location for each of the BS. Correction based on the detection of the absence of direct beam distribution and the subtraction of the obtained estimates of the magnitude of compensation is proportional to the average radius r of the area of interest scattering about MC. Secondly, the decision to end location is taken after the formation of the coordinates of the MC. It is used as the data immediately after receiving signal locations on each of the BS and formed the coordinates.

1. The method of determining the location of a mobile station (MS), namely, that selects the active base station (BS)that will participate in determining the location of the MS, passed on the MC command to initiate the transfer signal sequence location, with the necessary parameters of this sequence is passed to the active BS command to start the reception signal sequence locations, at this point the relevant parameters of this sequence, and begin the process of identifying the location of the MS, the MS generates and transmits a sequence of locations in accordance with the laws the AI received parameters, on each active BS consistently take each of the sequence of the signals of location and form an estimate of the time of his coming, determine the location of the MS, decide on the completion or continuation of the procedure of determining the location of the MS, if it is decided to proceed, then resume the positioning, if the decision on the completion of the procedure, complete the procedure, passing on the MC command of the termination of the transmission of the signals of location and formed to assess the location, wherein the carry correction estimate the time of arrival of the signal, thus forming an assessment factor of rice for a given signal location, compare the estimation of the factor of rice with a threshold, if the estimation of the rice factor does not exceed the threshold, then decide about the lack of direct beam on this BS and correct estimation of time of arrival of a signal, forming a correction value proportional to the average radius of the zone of interest scattering about MS, and subtracting the correction value from the generated estimate the time of arrival of a signal location, if the estimation of the rice factor exceeds the threshold, as adjusted using the generated estimate of the time of arrival of a signal location, the location of the MS is determined taking into account the adjusted estimated time of arrival of the signal local is all active BS, the decision on the completion or continuation of the procedure of determining the location of the MS to accept, given the results positioning.

2. The method according to claim 1, characterized in that the estimation of the rice factor is formed as the ratio of the mean square amplitude of the signal to the average squared deviation of the amplitude from the average value.

3. The method according to claim 1, wherein when receiving the first signal from the signal sequence of a location decision on completion of the procedure of determining the location of the MS take on estimates of the relationship of signal to interference if these estimates exceed the required threshold for each active BS, otherwise decide to proceed.

4. The method according to claim 1, characterized in that when receiving the second and subsequent signals from the signal sequence of locations obtained the estimate of the MS location is compared with the evaluation obtained by the previous signal, if the distance between the two estimates is less than the threshold, then decide on the completion of the procedure, otherwise decide to proceed.

5. The method according to claim 1, characterized in that the threshold is set based on the maximum possible movement of the subscriber for the interval between successive signals of a location.



 

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3 cl, 3 dwg, 1 tbl

FIELD: mobile communications.

SUBSTANCE: power controller, placed between filters, generating common-mode and quadratic channels pulses, and frequency transformer, during each selection period calculates compensation signals for pulses of signals, which increase relation of top power to average power; by means of said pulse generating filters among compensation signals it filters out compensation signals having higher level and combines compensation signals having passed filtering stage with source signals. In such a way, spectrum expansion beyond limits of signals frequencies band is suppressed. In case of a system, supporting numerous assigned frequencies, adjustment of relation of top power to average power is performed for each assigned frequency according to its maintenance category.

EFFECT: higher efficiency.

4 cl, 19 dwg

FIELD: radio communication.

SUBSTANCE: method includes radio communications by means of low-power intermediate transmitters, provided by non-directed antennae, dropped from moving objects, while these dropped transmitters are previously manufactured at said moving objects, and after finishing communications these transmitters are destroyed.

EFFECT: higher interference resistance, higher personnel safety, lesser dimensions, higher efficiency.

2 cl, 7 dwg, 1 tbl

FIELD: radio communications; data transfer from mobile object to stationary one residing at initial point of mobile object route.

SUBSTANCE: proposed method intended for using transceiving stations of mobile and stationary objects distinguished by small size and mass and various radio electronic means of low noise immunity disposed on stationary and mobile objects, that provides for enhanced electromagnetic safety of personnel in stationary and mobile objects, with reduced space requirement for radio communication system involves radio communications with aid of low-power intermediate transceiving stations dropped from mobile object which are equipped with nondirectional antennas, these intermediate transceiving stations being pre-manufactured on mobile object and destroyed upon termination of radio communications.

EFFECT: enhanced effectiveness of method for simultaneous operation of a number of radio communication systems.

2 cl, 6 dwg, 1 tbl, 1 app

FIELD: networks and communications.

SUBSTANCE: instead of storing routing data for each possible inter-cell transfer of service on each control node, technology of signaling network is used to transfer all appropriate data about inter-cell service transfer between all control nodes, to coordinate routing data transfer along radio access network.

EFFECT: higher efficiency.

3 cl, 3 dwg

FIELD: navigation.

SUBSTANCE: method can be used for designing of control system for rockets and radio altimeter for getting information on relative altitude of flight of rocket without irradiating radio signals at low and high frequencies and at irradiating of low energy at extremely low altitude flights. Before flight airplane-carrier of "air-surface" class rockets is placed into position with well known coordinates. Airplane-carrier is equipped with consumer navigation instrumentation which receives radio signals of GLONASS or GPS either both systems. Coordinates of position of aerial of consumer navigation instrumentation are calculated on the base of radio signals. Differential corrections if coordinates of airplane-carrier on the base of known real coordinates airplane-carrier. Values of differential corrections are introduced into consumer navigation instrumentation placed onto rocket before taking off. During flight of consumer navigation instrumentation rocket the plane coordinates of rocket and absolute altitude of flight of rocket are determined when taking differential corrections into account. Plane coordinates of rocket achieved during flight are introduced into digital map of region and height of region above which the rocket moves instantly is determined from plane coordinates. Relative altitude of flight is calculated and radio altimeter is switched on if relative altitude drops lower than calculated altitude of safe flight.

EFFECT: improved precision of measurement.

1 dwg

FIELD: applicable in instrument engineering, in particular, in instruments using remote control of the actions of the observer-operator on the ground.

SUBSTANCE: the method consists in measurement of the object coordinates, observer's coordinates and transmission of them for further use, as well as in finding of the observer's bearings with due account of obtaining of target designation and determination of the error of the preset and current coordinates. The observer performs scanning of the ground with fixation of the readings of the azimuth and elevation angle sensors, readings of the device for determination of the observer's own coordinates at detection by it of the object of observation. These data are transmitted to an individual control device of the observer. The own coordinates of each observer via individual transceivers are transmitted to the control and computations device of a group equipment, having a storage unit, which contains a digital model of the ground relief of observation and a data base for target distribution and renewal. The obtained data on location of the observers, as well as of the targets from the data base for target distribution are applied to the relief digital model. The data on the relative location of the observer and the target distributed to him are transmitted via the transceivers to the observer's control device, in which they are compared with the data obtained from the azimuth and elevation is transmitted to the indicators of the vertical and horizontal turning of the observer's scanning device. The device for finding one's bearings on the ground has location and orientation sensors, control and computations device, transceivers, scanning device for the observer with indicators of vertical and horizontal turning, sensors of the location in space in azimuth and angle of elevation, device for determination of the observer's own coordinates, having a navigational equipment linked with a satellite. The observer's transceiver is coupled to a group transceiving device connected to the control and computations device of the group equipment. The control and computations device of the group equipment comprises a storage unit, having a ground relief digital model and a data base for target distribution.

EFFECT: simplified and enhanced reliability of use of the system of transmission to the operator of the information on the direction on the ground.

3 cl, 2 dwg

The invention relates to receivers, which provide a measure of the information of the location of the satellites and are used in the detection system (GPS)location

The invention relates to the field of landing aircraft (LA) based on satellite navigation systems (SNS) GLONASS, GPS, GNSS, and can be used to equip unequipped radiobeacon boarding means airfields and helipads, which is achievable technical result

The invention relates to the field of satellite navigation and can be used to determine the ionospheric propagation delay of the signals of global navigation satellite systems using navigation user equipment in global navigation satellite systems operating on the same frequency

The invention relates to radio navigation systems and can be used for radionavigation determine the speed of a moving object as a consumer radionavigation information space navigation system (SNS)

The invention relates to a method and apparatus for reducing the search space of code shift in the receiver for the Global positioning system and, more specifically, to reduce the search space of code shift in the receiver for the Global positioning system that supports the connection to the cellular mobile station operating in a cellular telephone system

The invention relates to satellite navigation and can be used to determine the spatial orientation of moving objects interferometric method when the size of the interferometer to a few meters

The invention relates to the field of rocket and space technology and can be used for navigation support facilities - users of navigation on the earth's surface, in the air and near-earth space

FIELD: applicable in instrument engineering, in particular, in instruments using remote control of the actions of the observer-operator on the ground.

SUBSTANCE: the method consists in measurement of the object coordinates, observer's coordinates and transmission of them for further use, as well as in finding of the observer's bearings with due account of obtaining of target designation and determination of the error of the preset and current coordinates. The observer performs scanning of the ground with fixation of the readings of the azimuth and elevation angle sensors, readings of the device for determination of the observer's own coordinates at detection by it of the object of observation. These data are transmitted to an individual control device of the observer. The own coordinates of each observer via individual transceivers are transmitted to the control and computations device of a group equipment, having a storage unit, which contains a digital model of the ground relief of observation and a data base for target distribution and renewal. The obtained data on location of the observers, as well as of the targets from the data base for target distribution are applied to the relief digital model. The data on the relative location of the observer and the target distributed to him are transmitted via the transceivers to the observer's control device, in which they are compared with the data obtained from the azimuth and elevation is transmitted to the indicators of the vertical and horizontal turning of the observer's scanning device. The device for finding one's bearings on the ground has location and orientation sensors, control and computations device, transceivers, scanning device for the observer with indicators of vertical and horizontal turning, sensors of the location in space in azimuth and angle of elevation, device for determination of the observer's own coordinates, having a navigational equipment linked with a satellite. The observer's transceiver is coupled to a group transceiving device connected to the control and computations device of the group equipment. The control and computations device of the group equipment comprises a storage unit, having a ground relief digital model and a data base for target distribution.

EFFECT: simplified and enhanced reliability of use of the system of transmission to the operator of the information on the direction on the ground.

3 cl, 2 dwg

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