JP5355365B2 - Communication analysis system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a communication analysis system which performs interference separation using only receiving intervals of signals (namely, the communication period of a terminal) without using communication specifications (radio wave specifications) such as bandwidth and a carrier frequency. <P>SOLUTION: The communication analysis system is provided with: a receiver 10 which receives radio waves from a plurality of terminals which belong to a plurality of networks, respectively; and a communication analyzer 20 which applies predetermined algorithm to an interference reception signal to be obtained from the receiver 10. The communication analyzer 20 includes: a periodicity detection part 21 which detects the communication period when the terminal of each network performs communication from the interference received signal; and a separation part 22 which tests each received signal on the basis of the communication period of each network detected by the periodicity detection part 21 to separate each received signal for each terminal. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a communication analysis system that separates interference using only a signal reception interval (that is, a communication cycle of a terminal) without using communication specifications (radio wave specifications) such as bandwidth and carrier frequency. is there.

  As a terminal separation method for communication with periodicity, a technique for separating an interference reception signal from a terminal that performs communication using frequency hopping (FH) has been proposed. In the conventional method, received signals are roughly classified according to features such as communication duration, bandwidth, carrier frequency, etc., and interference reception is performed by making hypotheses according to features such as communication duration in the classified signals. The signal was separated for each transmission source (see, for example, Patent Document 1).

Japanese Patent No. 4218369

  In Patent Document 1, which is a conventional technology, interference separation is performed by setting a hypothesis according to characteristics such as a communication duration of a received signal, a bandwidth, and a carrier frequency. However, the communication duration, a bandwidth, and a carrier frequency are the same. When analyzing the signal from a terminal belonging to a network that uses the value of で at each terminal, there is a problem that it is not possible to use a hypothesis using these as feature quantities.

  The present invention has been made to solve the above-described problems, and does not use communication specifications (radio-wave specifications) such as bandwidth and carrier frequency, and does not use signal reception intervals (that is, terminals). It is an object of the present invention to obtain a communication analysis system capable of separating interference using only the communication cycle.

The present invention comprises a receiving device that receives radio waves from a plurality of terminals that respectively belong to a plurality of networks, and a communication analysis device that applies a predetermined algorithm to an interference reception signal obtained from the receiving device, The communication analyzer includes a periodicity detection unit that detects a communication cycle in which a terminal of each network performs communication from an interference reception signal, and a verification of each received signal based on the communication cycle of each network detected by the periodicity detection unit. And a separation unit that separates each received signal for each terminal , and the periodicity detecting unit performs communication using only the reception time information of each received signal without using communication parameters of the received signal. Correlation processing is performed on the reception time detection unit that detects the period and detects only the reception time from each reception signal, and the pulse signal having only the reception time detected by the reception time detection unit as information. A correlation processing unit, a peak detection unit for detecting a correlation peak with respect to a correlation result obtained by the correlation processing unit, a PRI conversion for the correlation peak detected by the peak detection unit, and a harmonic component from the correlation peak And a PRI conversion unit that calculates a communication cycle by removing erroneous detection signal components, and the separation unit is configured to obtain a communication cycle detected by the periodicity detection unit and an integer multiple of the received signal for all received signals. Network separation that tests whether a signal exists at a location, assigns a corresponding communication cycle to all received signals, and separates the received signals for each network that belongs to the same network as signals within the same network And signals in each network separated by the network separation unit, signals at positions that are integral multiples of the communication cycle of each network are sent from the same terminal. Containing a terminal separation section for separating the items, in communication analysis system, characterized in that.

  According to the communication analysis system of the present invention, interference separation can be performed using only signal reception intervals without using communication parameters (radio wave parameters) such as bandwidth and carrier frequency.

It is a figure which shows the structure of the communication analysis system which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure of the communication analysis apparatus of the communication analysis system which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure of the periodicity detection part of the communication analysis apparatus of the communication analysis system which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure of the isolation | separation part of the communication analysis apparatus of the communication analysis system which concerns on Embodiment 1 of this invention. It is a figure which shows the FH-TDMA network of the communication analysis system which concerns on Embodiment 1 of this invention. It is a flowchart which shows operation | movement of the peak detection part in the periodicity detection part of the communication analysis apparatus of the communication analysis system which concerns on Embodiment 1 of this invention. It is a figure for demonstrating operation | movement of the PRI conversion part in the periodicity detection part of the communication analysis apparatus of the communication analysis system which concerns on Embodiment 1 of this invention. It is a figure for demonstrating operation | movement of the error correction | amendment part in the periodicity detection part of the communication analysis apparatus of the communication analysis system which concerns on Embodiment 1 of this invention. It is a figure which shows the structure of the communication analysis system which concerns on Embodiment 2 of this invention. It is a figure for demonstrating operation | movement of the two communication analysis apparatuses of the communication analysis system which concerns on Embodiment 2 of this invention.

  Hereinafter, preferred embodiments of a communication analysis system of the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
A communication analysis system according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 is a diagram showing a configuration of a communication analysis system according to Embodiment 1 of the present invention. In the following, in each figure, the same reference numerals indicate the same or corresponding parts.

  In FIG. 1, the communication analysis system according to the first embodiment of the present invention includes an antenna and the like, and receives a receiving device 10 that receives radio waves flying in real space, and received data obtained from the receiving device 10. A communication analysis device 20 to which the algorithm of the present invention is applied, and a display device 30 for displaying and recording a signal separation result obtained by the communication analysis device 20 are provided.

  Further, terminal 1, terminal 2, and terminal 3 belong to network # 1. Terminal 4, terminal 5, terminal 6, and terminal 7 belong to network # 2.

  FIG. 2 is a block diagram showing the configuration of the communication analysis device of the communication analysis system according to Embodiment 1 of the present invention.

  In FIG. 2, the communication analysis apparatus 20 does not use communication parameters (radio parameters) such as the frequency and bandwidth of the received signal from the interference received signals from a plurality of networks that perform communication, and transmits each received signal. The periodicity detection unit 21 that estimates the communication cycle in which the terminals of each network communicate using only the reception time information, and the test of each received signal is performed based on the communication cycle of each network obtained by the periodicity detection unit 21. And a separation unit 22 that separates each received signal for each terminal.

  FIG. 3 is a block diagram showing the configuration of the periodicity detection unit of the communication analysis device of the communication analysis system according to Embodiment 1 of the present invention.

  In FIG. 3, the periodicity detection unit 21 uses, as information, only the reception time detection unit 211 that extracts only the reception time for each reception signal from the reception signal, and the reception time information detected by the reception time detection unit 211. A correlation processing unit 212 that performs correlation processing on the pulse signal, a peak detection unit 213 for detecting a correlation peak from the correlation result obtained by the correlation processing unit 212, and a correlation peak detected by the peak detection unit 213. A PRI conversion unit 214 that performs PRI (Pulse Repetition Interval) conversion on the correlation peak, removes a harmonic component and a false detection signal component from the correlation peak, and calculates a communication period is provided.

  In addition, the periodicity detection unit 21 cancels the communication cycle detected by duplication by arbitrarily setting an allowable error range and performing a verification process on the communication cycle obtained by the PRI conversion unit 214. An error correction unit 215 is further provided that deletes the calculated communication cycle existing in the range of (communication cycle of the signal to be verified) + (error allowable range) for all communication cycles calculated by the conversion unit 214. . Note that the correlation processing unit 212 performs analysis by referring to the communication parameters (radio parameters) in the correlation processing when the communication parameters (radio parameters) of the received signal frequency and bandwidth can be used. A process other than giving a correlation peak to a signal other than a signal having a target communication specification (radio wave specification) or lowering the correlation is performed.

  FIG. 4 is a block diagram showing the configuration of the separation unit of the communication analysis device of the communication analysis system according to Embodiment 1 of the present invention.

  In FIG. 4, the separation unit 22 performs a test to determine whether a signal is present at the communication cycle and its integer multiple position with respect to all the received signals using the communication cycle calculated by the periodicity detection unit 21. A corresponding communication cycle is assigned to the received signal, and a signal having the same communication cycle is separated as a signal in the same network by the network separating unit 221 that separates the received signal for each network to which the signal belongs. A terminal separation unit 222 is provided for classifying a signal at an integral multiple of the communication cycle of each network as a signal from the same terminal with respect to the signal in each network.

  The network separation unit 221 tests whether or not there is a signal at an integer multiple position of the communication cycle with respect to the analysis target signal for all received signals, and if there is a signal at an integer multiple position of the communication cycle, A communication cycle is assigned to each received signal. At this time, the signal to be judged is determined in consideration of the loss detection of the received signal (missing the originally generated signal) and the erroneous detection (the signal other than the originally generated signal (noise etc.) is the analysis target signal). As a reference, when there are N (N ≦ M) or more signals in M consecutive communication cycle intervals, the communication cycle in which the determination is performed is associated with the determination target signal. Here, M and N are arbitrarily set values. By collecting signals with the same communication cycle, they are separated into signals of the same network.

  The terminal separation unit 222 performs a test on the signal sequence for each network separated by the network separation unit 221 at a corresponding communication cycle, and sets a terminal present at an integer multiple of the communication cycle of the verification target signal as the same terminal. To separate.

  FIG. 5 is a diagram showing an FH-TDMA network of the communication analysis system according to Embodiment 1 of the present invention.

In the communication analysis system according to Embodiment 1 of the present invention, there are a plurality of networks (FH-TDMA networks) that perform time division multiple access (TDMA) using frequency hopping (FH) as spread spectrum. In some cases, network separation and terminal separation are performed under the following preconditions.
Each terminal 1-3, 4-7 uses the same time slot until the end of communication.
The frame lengths of the plurality of TDMA networks # 1 and # 2 are basically different from each other. (If the frame length is the same, network separation is not possible, but terminal separation is possible.)

  Next, the operation of the communication analysis system according to the first embodiment will be described with reference to the drawings.

  FIG. 6 is a flowchart showing the operation of the peak detector in the periodicity detector of the communication analyzer of the communication analysis system according to Embodiment 1 of the present invention. FIG. 7 is a diagram for explaining the operation of the PRI conversion unit in the periodicity detection unit of the communication analysis device of the communication analysis system according to Embodiment 1 of the present invention. Further, FIG. 8 is a diagram for explaining the operation of the error correction unit in the periodicity detection unit of the communication analysis device of the communication analysis system according to Embodiment 1 of the present invention.

  First, terminal 1, terminal 2, and terminal 3 transmit radio waves at intervals of frame length FLA until the end of communication using the same time slot acquired when communication is first started according to frame length FLA. Suppose you are.

  The terminal 4, the terminal 5, the terminal 6, and the terminal 7 respectively transmit radio waves at intervals of the frame length FLB until the end of communication using the same time slot as the time slot acquired when communication is first started according to the frame length FLB. Assume that you are sending.

  The receiving device 10 receives radio waves transmitted from the terminals 1-3 and 4-7. The receiving device 10 sends the received signal to the communication analyzing device 20 in real time or with a certain time delay for each received signal (because the purpose is to detect the periodicity of the received signal, The exact absolute time of reception is not necessary, but the relative time between the received signals is important).

  The communication analysis device 20 receives a reception signal from the reception device 10. The reception time detection unit 211 of the periodicity detection unit 21 in the communication analysis device 20 provides information on only the reception time at the reception device 10 with respect to a reception signal (raw data) having amplitude information and the like at the reception device 10. And by giving a pulse signal having an amplitude of 1 at the corresponding time, only the reception time is held as time information. When signals from different networks are received simultaneously (frequency is different depending on FH, no collision occurs), the amplitude level is not added and the amplitude is 1 as a single signal for the corresponding time. The pulse signal is given. The reception time detection unit 211 sends the generated reception time series signal to the correlation processing unit 212 in the periodicity detection unit 21.

  The correlation processing unit 212 in the periodicity detection unit 21 performs processing such as autocorrelation on the pulse signal corresponding to the reception time obtained by the reception time detection unit 211, and detects the periodicity of the reception signal. However, in this process, since the time slot length of TDMA is the same, a relatively high correlation result is detected in addition to the original frame length, or in addition to the autocorrelation value for the same frame, There remains a problem that high correlation results can be obtained even with harmonic components at integer multiple positions. When a difference in communication parameters (radio parameters) such as frequency and bandwidth can be used, a signal having an unanalyzed communication parameter (radio parameters) has an identifier for the received time series signal. To avoid correlation processing. The autocorrelation result of the reception time series signal is sent to the peak detector 213 in the periodicity detector 21.

  As shown in FIG. 6, the peak detection unit 213 in the periodicity detection unit 21 performs peak determination on all signals of the correlation result obtained by the correlation processing unit 212, as shown in FIG. The threshold value is set in the following procedure from step (1) to step (5) on the basis of the signals before and after), and peak detection is performed on the signal exceeding the threshold value.

In step (1), the sum of N / 2 signals obtained from the determination signal number N arbitrarily set from the signal at a position p arbitrarily set from the peak determination target signal (target signal). Are calculated before and after the peak determination target signal as a threshold candidate. Assuming that the signal sequence for performing peak determination is Rxx (i) (where i = 1 to L) and L is the number of peak determination target signals obtained by the correlation processing unit 212, the upper threshold Thre _upper of the peak determination target signal is given by It becomes like 1). The lower limit threshold “Thre _lower” of the peak determination target signal is expressed by Equation (2).

In the case where no upper limit with respect to the peak determination target _signal, and 0 to _{Thre upper.} On the other hand, if it does not exist a lower limit of the peak determination target _signal, and 0 to _{Thre lower.}

  In step (2), the two threshold candidates obtained in the processing of step (1) above are compared in size, and the larger one is set as the threshold.

In step (3), the threshold value obtained in the process of step (2) is averaged by dividing by N / 2 .

  In step (4), the threshold value obtained by the process in step (3) is multiplied by K using a threshold coefficient K that is arbitrarily set, so that the threshold value has a degree of freedom, and the final threshold value is obtained. And

  In step (5), the peak determination target signal (target signal) is compared with the threshold value obtained by the processing in step (4) above, and the signal exceeding the threshold value is extracted as a peak.

  The peak detection unit 213 sends the peak extraction result from the autocorrelation result to the PRI conversion unit 214 in the periodicity detection unit 21.

  The PRI conversion unit 214 in the periodicity detection unit 21 performs the following steps (1) to (3) on the peak detection result from the peak detection unit 213.

In step (1), the range of the frame length to be examined is set to τ _min <τ <τ _max using an arbitrarily set lower limit value τ _min and upper limit value τ _max of the frame length, and this is arbitrarily set K Divide equally into segments. This detailed section is called a PRI bin. The width of the PRI bin can be expressed by equation (3), and the center value of each PRI bin is given by equation (4). (It is meaningful to determine the frame length of the received signal using τ _min and τ _max .)

In step (2), the PRI conversion is given by the calculation of equation (5). Here, t _m is a time series corresponding to the peak extraction result obtained by the peak detector 213, and t _n is a signal shifted forward from t _m by one. That is, it building up phase component corresponding to each by dividing all the time difference t _m -t _n with its forward signals t _n for a signal t _m. By performing this process on all the signals obtained by the peak detector 213, the phase component _Dk is strengthened and has a large value at the phase corresponding to the original frame length. On the other hand, in the phase not corresponding to the original frame length, the phase component _Dk becomes a small value without strengthening each other.

In step (3), the result of equation (5) is strengthened and has a certain peak component depending on the correlation of each signal other than the original frame length. Therefore, the phase using the threshold value of equation (6) is used. It performs threshold determination for the values of the components D _k, tau _k corresponding to the phase component D _k which exceeds the threshold value becomes the frame length. Here, T is an observation time, τ _k is a frame length candidate, and α is an arbitrarily set threshold candidate.

  In the PRI conversion, by replacing the peak extraction result with the phase component, the harmonic component that has become a problem in the correlation processing unit 212 is rotated in phase and accumulated in the same phase. Can be removed. Further, by setting a threshold value in PRI conversion, it is possible to remove components having a relatively high correlation value other than the original frame length. As a result, the frame length obtained by the PRI conversion unit 214 is transmitted to the error correction unit 215.

  As shown in FIG. 7A, in the case of only correlation processing by the correlation processing unit 212, there are many peaks, and only correct peaks cannot be extracted. Further, in the case of only the PRI conversion process by the PRI conversion unit 214, a result as shown in FIG. 7B is obtained. As shown in FIG. 7C, correct peaks can be obtained by performing PRI conversion on the peaks obtained as a result of many correlation processes.

  The error correction unit 215 in the periodicity detection unit 21 performs a verification process by arbitrarily setting an allowable error range with respect to the frame length obtained by the process of the PRI conversion unit 214, thereby obtaining a result of the PRI conversion unit 214. Also, the frame length detected by dub is canceled. An error tolerance is set for all the calculated frame lengths, and the frame length existing in (frame length) + (error tolerance) is cleared.

  As shown in FIG. 8, the communication cycle may be detected at a position slightly deviated from the original communication cycle. The reason for this is that if the analysis target is a signal with a time width, the correlation peak can be continuously acquired along with the original peak during the correlation process, and cannot be removed as an error even in the previous processes. Occurs due to missing items. The error correction unit 215 deletes the detected virtual image of the communication cycle by setting an error tolerance range (detects the first communication cycle in the communication cycle group in which the virtual image is generated).

  The network separation unit 221 in the separation unit 22 receives the frame length FLA obtained from the error correction unit 215 in the periodicity detection unit 21 for the reception time series signal from the reception time detection unit 211 in the periodicity detection unit 21. And the FLB are used to test whether a signal exists at an integer multiple position of the frame length with respect to the determination target signal. If a signal exists at an integer multiple position of the frame length, the frame length for each received signal is determined. Is allocated. At this time, in consideration of loss detection or erroneous detection of the received signal, when there are N (N ≦ M) or more signals in M consecutive frame length intervals with reference to the determination target signal, the determination target signal is The frame length for which the determination has been made is associated. Here, M and N are arbitrarily set values. By collecting signals with the same associated frame length, they are separated into signals of the same network. As a result, the received signal is classified into a signal group to which the frame length FLA is assigned and a received signal to the signal group to which the frame length FLB is assigned. The signal group grouped by the corresponding frame length becomes the network separation result. The network separation result is sent to the terminal separation unit 222 in the separation unit 22.

  The terminal separation unit 222 in the separation unit 22 performs a test on the network separation result obtained from the network separation unit 221 using the frame length obtained from the error correction unit 215, and is an integral multiple of the frame length of the signal to be tested. The terminals existing in the location are separated as the same terminal. As a result, it can be seen that there are three types of terminals in the frame length FLA network (each received signal is separated into three terminals), and there are four types of terminals in the frame length FLB network. (Each received signal is separated into four terminals).

  The communication analysis device 20 outputs arbitrary data from the received signal (raw data), network separation result, and terminal separation result information to the display device 30.

  The display device 30 displays and records the received signal (raw data) obtained from the communication analysis device 20, the network separation result, and the terminal separation result.

  As described above, according to the first embodiment, only the reception time information is extracted from the received signal, and is subjected to the PRI conversion after the correlation process, so that it exists in the multiple component position of the original frame length generated in the correlation process result. It is possible to suppress erroneous detection that occurs when noise or the like is mixed by removing harmonic components or setting a threshold value in PRI conversion. Also, instead of directly performing PRI conversion on the reception time information, by performing PRI conversion after correlation processing, it is possible to cope with initial phase collapse between frames that occurs when a received signal is lost or erroneously detected. I can do it. (PRI conversion is an algorithm that performs determination by accumulating values for phase components. If a signal loss or misdetection occurs between frames and phase breakage occurs, the original frame length extraction becomes difficult. .)

  Also, by setting the number of guard signals and performing peak extraction, it is possible to improve the peak detection performance for a received signal having a signal width such as a signal from an assumed FH-TDMA network. (If autocorrelation is performed on a received signal having a time width of the TDMA time slot length, an erroneous peak is likely to occur near the original peak due to the time width. (There is a risk that the original peak may be lost and the threshold level is manipulated by setting the number of guard signals.)

  In addition, by setting an error tolerance in the error correction unit 215, when the analysis target has a reception time width such as the time slot length of TDMA, the removal of the frame length that is expected to be detected even around the original frame length is eliminated. Is possible. (If the signal width is wide, a correlation value is obtained between the signal widths in the correlation processing. If the PRI conversion unit cannot remove it, these erroneously detected frame length values are removed in this processing.)

  In addition, since a frame length is assigned when a signal is present at N out of M frame length positions in network separation, it is resistant to missed detection and false detection that cause a loss of period of the received signal. I can do it. (If network separation is performed when all signals are present at integer multiple positions of the frame length, network separation cannot be performed correctly by only one missing signal (missing detection) and the like.)

  Furthermore, by performing terminal separation, it is possible to separate signals received through interference for each terminal.

Embodiment 2. FIG.
A communication analysis system according to Embodiment 2 of the present invention will be described with reference to FIGS.

  In the first embodiment, the signal received by one receiving device 10 is analyzed to perform interference separation of the received signal and separate into signals for each terminal. In the second embodiment, The location of the terminal corresponding to each received signal is determined using signals separated by using the two receiving devices 10A and 10B and the communication analyzing devices 20A and 20B.

  FIG. 9 is a diagram showing a configuration of a communication analysis system according to Embodiment 2 of the present invention.

  In FIG. 9, the receiving device 10 </ b> A and the receiving device 10 </ b> B are the same devices as the receiving device 10 of the first embodiment. However, the antenna must have an array configuration or the like so that the angle of each received signal can be measured. The communication analysis device 20A and the communication analysis device 20B are the same devices as the communication analysis device 20 of the first embodiment. The communication analysis device 20A receives and analyzes the signal from the reception device 10A. The communication analysis device 20B receives and analyzes the signal from the reception device 10B. The communication analysis device 20A and the communication analysis device 20B transmit the respective terminal separation results and received data to the collation / positioning device 40.

  In addition, the collation / positioning device 40 receives the separation result and the reception data from the communication analysis device 20A and the communication analysis device 20B, specifies the position for each terminal therefrom, and transmits the result to the display device 30. The display device 30 displays and records the signal separation results obtained by the communication analysis devices 20A and 20B and the terminal position result obtained by the collation / positioning device 40.

  Next, the operation of the communication analysis system according to the second embodiment will be described with reference to the drawings.

  FIG. 10 is a diagram for explaining the operation of the two communication analysis devices of the communication analysis system according to the second embodiment of the present invention.

  The operations at the terminals 1-3 and 4-7 are the same as those in the first embodiment. Receiving device 10A and receiving device 10B perform angle measurement on each received signal using array signal processing or the like. Data corresponding to each received signal and the angle measurement result is sent to the corresponding communication analysis device 20A or communication analysis device 20B by the same method as in the first embodiment.

  The operations of the communication analysis device 20A and the communication analysis device 20B are the same as the operation of the communication analysis device 20 of the first embodiment. Unlike the first embodiment, the output destination of the result is the output to the collation / positioning device 40. Further, the angle measurement result of each received signal is also output to the collation / positioning device 40.

  The collation / positioning device 40 receives the received signal (raw data), the network separation result, the terminal separation result, and the angle measurement result from the communication analysis devices 20A and 20B. For the terminal separation results in the communication analysis device 20A and the communication analysis device 20B, the signals when the correlation peak is the highest by performing time correlation processing are collated and identified as signals from the same terminal. The terminal separation result from the communication analysis apparatus 20A is associated with the terminal separation result from the communication analysis apparatus 20B.

  As a result, the positions of the receiving device 10A and the receiving device 10B are known, and the angle measurement results for the same terminal in the two receiving devices 10A and 10B (measured for the terminal separation results in the communication analysis devices 20A and 20B, respectively). By using, for example, triangulation or the like, the terminal is positioned and the position is specified. The collation / positioning device 40 outputs arbitrary data from the received signal (raw data), the network separation result, the terminal separation result, and the terminal position specifying result information to the display device 30.

  10A and 10B show a terminal separation result in the communication analysis apparatus 20A and a terminal separation result in the communication analysis apparatus 20B. Since the positions of the receiving device 10A and the receiving device 10B are different, the receiving times themselves from the terminals 1-3 and 4-7 between the receiving devices are different, but they are transmitted in the same frame period. The reception time interval in the receiving device 10B is the same, and the collation / positioning device 40 identifies the signals when the correlation processing peak is obtained as the same terminal.

  The display device 30 displays and records the results obtained from the collation / positioning device 40.

  As described above, according to the second embodiment, by configuring the two receiving devices 10A and 10B, the communication analysis devices 20A and 20B, and the collation / positioning device 40, the terminal location specification that cannot be performed in the first embodiment can be performed. Can be done.

Embodiment 3 FIG.
A communication analysis system according to Embodiment 3 of the present invention will be described.

  In the second embodiment, there are two receiving devices 10A and 10B and two communication analyzing devices 20A and 20B. In the third embodiment, the number of receiving devices and communication analyzing devices is increased to three or more. And

  Basically, the same operation as in the second embodiment is performed. In the collation / positioning device 40, the number of data to be handled increases by the number of receiving devices and terminal devices. When multiple positioning results are obtained due to this influence, an optimal solution is obtained using the least square method or the like.

  As described above, the third embodiment can improve the estimation accuracy of the terminal location specifying result by increasing the number of receiving devices and communication analysis devices.

  1-7 terminal, 10 receiving device, 10A, 10B receiving device, 20 communication analysis device, 20A, 20B communication analysis device, 21 periodicity detection unit, 22 separation unit, 30 display device, 40 collation / positioning device, 211 reception time Detection unit, 212 Correlation processing unit, 213 Peak detection unit, 214 PRI conversion unit, 215 Error correction unit, 221 Network separation unit, 222 Terminal separation unit

Claims (7)

A receiving device for receiving radio waves from a plurality of terminals respectively belonging to a plurality of networks;
A communication analysis device that applies a predetermined algorithm to the interference reception signal obtained from the reception device;
The communication analyzer is
A periodicity detecting unit for detecting a communication cycle in which a terminal of each network performs communication from an interference reception signal;
Based on the communication period of each network detected by the periodicity detection unit, each received signal is tested, and a separating unit that separates each received signal for each terminal ;
Including
The periodicity detection unit detects the communication cycle using only the reception time information of each received signal without using the communication parameters of the received signal,
A reception time detector that detects only the reception time from each received signal;
A correlation processing unit that correlates a pulse signal having only the reception time detected by the reception time detection unit as information,
A peak detection unit for detecting a correlation peak with respect to the correlation result obtained by the correlation processing unit;
A PRI conversion unit that performs PRI conversion on the correlation peak detected by the peak detection unit, calculates a communication cycle by removing a harmonic component and a false detection signal component from the correlation peak;
Including
The separation unit is
For all received signals, the communication cycle detected by the periodicity detection unit and the presence of a signal at an integer multiple position are tested, and the corresponding communication cycle is assigned to all received signals, so that the same communication is performed. A network separation unit that separates a received signal for each network to which a periodic signal is a signal in the same network;
A terminal separation unit that separates a signal at an integer multiple of the communication period of each network as a signal from the same terminal, with respect to the signals in each network separated by the network separation unit,
including,
A communication analysis system characterized by this. When the communication specification of the received signal can be used, the correlation processing unit refers to the communication specification in the correlation processing and does not give a correlation peak to a signal other than the signal having the communication specification to be analyzed. The communication analysis system according to claim 1 , wherein processing for reducing correlation is performed. The peak detection unit, for all signals of the correlation result obtained by the correlation processing unit,
Two threshold candidates by calculating the sum of N / 2 signals obtained from the number of determination signals N around the peak determination target signal, around the peak determination target signal, from a signal at a position away from the peak determination target signal by a predetermined number of guard signals. age,
The two threshold candidates are compared in size, and the larger threshold candidate is set as the first temporary threshold,
The first provisional threshold is averaged by dividing by N / 2 to obtain the second provisional threshold,
The final threshold value is multiplied by a predetermined threshold coefficient K with respect to the second temporary threshold value,
The communication analysis system according to claim 1 , wherein a peak determination target signal and a final threshold value are compared in size, and a signal exceeding the final threshold value is extracted as a peak. The periodicity detection unit
Including an error correction unit that deletes a calculated communication cycle existing in the range of (communication cycle of signal to be verified) + (error allowable range) for all communication cycles calculated by the PRI conversion unit. The communication analysis system according to claim 1, wherein: The network separation unit includes:
In consideration of loss detection and false detection of the received signal, the second predetermined number (second predetermined number ≦ first predetermined number) in the first predetermined number of consecutive communication cycle intervals with reference to the determination target signal If a signal is present or, claim, characterized in that associate communication cycle which has been subjected to the determination with respect to the determination target signal, the communication cycle associated to separate the same signal on the same network signals 1 The communication analysis system described. The terminal separation unit is
The signal sequence for each network separated by the network separation unit is verified at a corresponding communication cycle, and terminals existing at integer multiples of the communication cycle of the verification target signal are separated as the same terminal. The communication analysis system according to claim 1 . A first receiver that has an array antenna, receives radio waves from a plurality of terminals belonging to a plurality of networks, and performs angle measurement on each received signal;
A second receiving device having an array antenna, receiving radio waves from a plurality of terminals respectively belonging to a plurality of networks, and measuring angles with respect to each received signal;
A first communication analysis device that detects a communication cycle of each network using only reception time information of each received signal from the first receiving device, and separates each received signal for each terminal based on the detected communication cycle When,
A second communication analysis device that detects a communication cycle of each network using only reception time information of each received signal from the second receiving device and separates each received signal for each terminal based on the detected communication cycle When,
A collation / positioning device for specifying the position of each terminal based on the terminal separation result and the angle measurement result from the first and second communication analysis devices ,
The first and second communication analyzers are respectively
A periodicity detecting unit for detecting a communication cycle in which a terminal of each network performs communication from an interference reception signal;
Based on the communication period of each network detected by the periodicity detection unit, each received signal is tested, and a separating unit that separates each received signal for each terminal;
Including
The periodicity detection unit detects the communication cycle using only the reception time information of each received signal without using the communication parameters of the received signal,
A reception time detector that detects only the reception time from each received signal;
A correlation processing unit that correlates a pulse signal having only the reception time detected by the reception time detection unit as information,
A peak detection unit for detecting a correlation peak with respect to the correlation result obtained by the correlation processing unit;
A PRI conversion unit that performs PRI conversion on the correlation peak detected by the peak detection unit, calculates a communication cycle by removing a harmonic component and a false detection signal component from the correlation peak;
Including
The separation unit is
For all received signals, the communication cycle detected by the periodicity detection unit and the presence of a signal at an integer multiple position are tested, and the corresponding communication cycle is assigned to all received signals, so that the same communication is performed. A network separation unit that separates a received signal for each network to which a periodic signal is a signal in the same network;
A terminal separation unit that separates a signal at an integer multiple of the communication period of each network as a signal from the same terminal, with respect to the signals in each network separated by the network separation unit,
including,
A communication analysis system characterized by this.

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