JP2007232688A - Device and system for restraining gps disturbance wave - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem of a disadvantage wherein a calculation load is great in adaptive signal processing for estimating a disturbance wave arriving direction of unknown information and wherein a circuit scale and a calculation capacity are thereby required to be increased. <P>SOLUTION: This device for restraining the GPS disturbance wave mounted on own moving body is provided with a communication antenna for receiving a disturbance wave countermeasure signal including positional information of a disturbance wave generator output from the disturbance wave generator for generating the disturbance wave to a mating moving body, a GPS antenna for receiving a GPS positioning signal from a GPS satellite, a GPS positioning device for outputting positional information of the own moving body, using the GPS positioning signal received by the GPS antenna, an angular velocity sensor for measuring an angular velocity for finding an attitude angle of the own moving body, and a disturbance wave arriving direction specifying part for specifying a disturbance wave arriving direction, using the disturbance wave countermeasure signal received by the communication antenna, the positional information of the own moving body output from the GPS positioning device, and the angular velocity output from the angular velocity sensor. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a GPS jamming wave suppression device and a GPS jamming wave suppression system that are not affected by the jamming wave emitted from the jamming wave generator.

  2. Description of the Related Art A global positioning system (GNSS) such as GPS (Global Positioning System) in the United States is used for various purposes as a means for accurately knowing its own position. Also in the mobile body, in recent years, the mobile body which mounts a GPS positioning system is increasing for the purpose of the guidance accuracy improvement with respect to a target point.

  Since GPS performs positioning using very weak radio waves from satellites, it has a drawback of being vulnerable to jamming signals. For example, when the frequency band is a C / A (Clear and Acquisition or Coarse and Access) code in the L1 band (1575.42 MHz), the signal strength is about −130 dBm, and the GPS positioning signal is easily buried by the jamming signal. .

  In the case of a deception signal that resembles an actual GPS positioning signal, the GPS positioning system misrecognizes the deception signal as a correct GPS positioning signal and performs positioning calculation using the deception signal, so that an incorrect positioning result is obtained.

  Using this fact, in order to reduce the performance of the GPS positioning system mounted on the other party mobile body, jamming signals such as jamming signals and deceptive signals may be output from comrades. However, when the own mobile body is equipped with the GPS positioning system, the disturbing wave from the fellow friend affects the GPS positioning system mounted on the own mobile body.

  As a method of eliminating the influence of jamming signals, which are one of jamming waves, each of an array antenna having a plurality of antenna elements, a device for converting a signal received from the antenna into a plurality of frequency subbands, and each subband A device that performs adaptive array processing and provides a plurality of adaptively processed subbands in response thereto, and a device that normalizes the adaptively processed subbands, reduce the antenna gain in the direction of arrival of the jamming signal, and null The prior art of making a point is known (see, for example, Patent Document 1).

  In addition, as a method for eliminating the influence of a fraud signal that is one of jamming waves, a conventional method of discriminating a fraud signal by using first and second antennas, a GPS signal receiving system, and a specific transmitter distance difference processor. A technique is known (for example, refer to Patent Document 2).

JP 2005-527789 A (4th page, FIG. 1) Japanese translation of PCT publication 2000-512018 (page 11, FIG. 2)

  Patent Document 1 and Patent Document 2 are signal processing based on the premise that the jamming signal generation position, which is an interference wave, and the type of fraud signal are unknown information. That is, Patent Document 1 performs null point maneuvering by estimating the arrival direction of a jamming signal using adaptive signal processing assuming that the generation position of the jamming signal is unknown. In Patent Document 2, the type of fraud signal is unknown, and the fraud signal is determined using the first and second antennas, the GPS signal receiving system, and the specific transmitter distance difference processor.

  In this way, since the countermeasures against jamming are based on unknown information, the other party also radiated the jamming waves emitted by the companion's jamming wave generator for the purpose of reducing the performance of the GPS positioning system mounted on the other party's mobile body. It is processed in the same way as the jamming wave.

  Estimating the arrival direction of the jamming signal, which is unknown information, has a large calculation load for adaptive signal processing, requires many signal processors, and has the disadvantage of increasing the circuit scale and calculation processing capability. Further, when dealing with both jamming signals and fraudulent signals, it is necessary to use both Patent Document 1 and Patent Document 2, and there is a disadvantage that the circuit scale and calculation processing capacity are further increased.

  The present invention has been made in order to solve the above-described problems, and has an object to reduce the load on the circuit scale and the calculation processing capacity without being affected by the disturbing wave radiated from the pals.

The GPS jamming wave suppression apparatus according to the present invention is
A GPS interference wave suppressing device mounted on its own mobile body for suppressing malfunction of its own GPS positioning device due to interference waves,
A communication antenna for receiving an interference wave countermeasure signal including at least position information of the interference wave generating device, which is output from the interference wave generating device for generating the interference wave for causing the GPS positioning device mounted on the opponent mobile body to malfunction. ,
A GPS antenna for receiving GPS positioning signals from GPS satellites;
A GPS positioning device that outputs position information of the mobile body using the GPS positioning signal received by the GPS antenna;
An angular velocity sensor for measuring an angular velocity for obtaining a posture angle of the mobile body of the self;
Using the interference wave countermeasure signal received by the communication antenna, the position information of the mobile body output from the GPS positioning device, and the angular velocity output from the angular velocity sensor, the interference wave arrival direction is determined. And an interference wave arrival direction identifying unit for identifying.

  According to the present invention, the interference wave countermeasure signal including at least the interference wave generator position information indicating the position of the interference wave generator is transmitted to the GPS interference wave suppressor to perform GPS positioning, thereby eliminating the interference wave. The GPS positioning accuracy can be maintained or improved. Further, since the interference wave countermeasure signal is known information, it is possible to eliminate the interference wave by simpler signal processing than in the prior art, and it is possible to reduce the load on the circuit scale and calculation processing capability.

Embodiment 1 FIG.
FIG. 1 shows an example of system operation in the first embodiment. The GPS positioning signal output from the GPS satellite 11 is received by a GPS positioning device that implements a GPS positioning system. In FIG. 1, the GPS positioning device is mounted on a counterparty mobile body 12, an interference wave generating device 13, and its own mobile body 14. Examples of the mobile body 14 include a flying body, an aircraft, a ship / ship, a vehicle / tank, and a portable terminal carried by a person.

  The counterparty mobile body 12 is equipped with a GPS positioning device for the purpose of guiding to the target point. The GPS positioning device mounted on the counterparty mobile body 12 receives the GPS positioning signal output from the GPS satellite 11. The self-position is specified based on the GPS positioning signal, the relative position between the target point and the self-position and the attitude angle of the self are calculated, and the opponent mobile body 12 is guided toward the target point.

  As a countermeasure against the counterparty mobile body 12, a method of preventing the arrival at the target point by reducing the GPS positioning performance of the counterparty mobile body 12 is conceivable. In order to reduce the GPS positioning capability of the counterparty mobile body 12, a jamming signal or a deception signal is output from the jamming wave generator 13 toward the counterparty mobile body 12. When the counterpart mobile body 12 receives a jamming signal, the GPS positioning signal cannot be captured. Alternatively, when a deception signal is received, the relative position with respect to the self position and the target point is erroneously calculated in order to calculate an erroneous pseudo distance amount. Therefore, guidance performance can be reduced.

  However, if the mobile unit 14 is also equipped with a GPS positioning device for the purpose of guidance to the target point, the mobile unit 14 is also affected by jamming signals or fraudulent signals output from the interference wave generator 13. Receive. Therefore, in order to prevent the GPS positioning performance of the own mobile unit 14 from deteriorating, the location information of the jamming wave generating device 13 or the information on the type of fraud signal is transmitted to the own mobile unit 14 as a jamming countermeasure signal. Thus, the influence of the interference wave is eliminated.

  In FIG. 1, there are two interference wave generators 13, and the interference wave generator position information 16, which is position information of the interference wave generator 13, is transmitted from the interference wave generator 13 to the base station 15 and all interference waves are generated. A case is shown in which the device location information 17 is aggregated and transmitted from the base station 15 to the mobile unit 14 of its own. After the base station 15 transmits the total interference wave generator position information 17 to its own mobile body 14, the interference wave generator 13 emits the interference wave. In the first embodiment, the jamming wave 18 may be either a jamming signal or a deception signal.

  The interference wave generating device 13 normally uses a plurality of interference wave generating devices 13 in order to cover a predetermined area with a radius of several hundred kilometers, for example, or to make it difficult for the other party to specify the presence or position of the interference wave generating device. In addition, it is premised on movement in order to change the predetermined area, and downsizing is required. For this purpose, the circuit for transmitting the interference wave generator position information 16 to the mobile body 14 should be miniaturized as much as possible.

  Therefore, the interference wave generator position information 16 is not transmitted to the mobile unit 14 using a plurality of communication lines, but is transmitted to the base station 15 and then transmitted to the mobile unit 14. The transmission to the base station 15 requires a smaller transmission power because the communication distance is shorter, and the size of the transmission circuit can be easily reduced.

  As means for transmitting the interference wave generator position information 16 from each of the interference wave generators 13 to the base station 15, either wireless communication or wired communication may be used. Further, an existing communication line such as a mobile phone line or a wireless LAN (Local Area Network) line may be used as an example of wireless communication, and an Internet line may be used as an example of wired communication.

  In the above description, the case where the base station 15 collects the interference wave generator position information 16 and transmits it to the own mobile unit 14 has been described. If the position information of the interference wave generators 13 can be received separately and does not prevent the interference wave generator 13 from being miniaturized, the interference wave generators are not aggregated in the base station 15 without collecting the interference wave generator position information 16. Needless to say, 13 may directly transmit the interference wave generator position information 16 to its own mobile unit 14.

  FIG. 2 shows a functional configuration diagram related to the present invention in the interference wave generator 13 used in the first embodiment. The interference wave generator 13 communicates with a GPS antenna unit 21 and a GPS receiver 22 that receive a GPS positioning signal from the GPS satellite 11, and a communication processing unit 23 that transmits the interference wave generator position information 16 to the base station 15. The antenna unit 24 includes an interference wave generation unit 25 that generates the interference wave 18 and an interference wave antenna unit 26. Note that the GPS antenna unit 21, the communication antenna unit 24, and the interfering wave antenna unit 26 may be combined with two or more antenna units as long as signals to be transmitted and received can be separated.

  The interference wave generator 13 is assumed to be moved and used instead of always being used at a specific location. Therefore, it has a GPS antenna unit 21 and a GPS receiving unit 22 for specifying its own position. After the movement, for example, before generating a jamming signal, which is one of interference waves, the GPS antenna unit 21 receives the GPS positioning signal output from the GPS satellite 11 and inputs it to the GPS receiving unit 22. The GPS receiver 22 specifies its own position, that is, the position of the interference wave generator, based on the input GPS positioning signal.

  When the interference wave generator position is specified, the interference wave generator position information 16 is input to the communication processing unit 23, and transmission processing such as modulation processing and frequency up-conversion to the carrier wave band is performed. When transmitting the interference wave generator position information 16 from the interference wave generator 13 to the base station 15, the communication processing unit 23 may perform a concealment process so that the information content is not intercepted. The interference wave generator position information 16 modulated and transmitted by the communication processing unit 23 is transmitted to the base station 15 via the communication antenna unit 24.

  Note that the type of the jamming signal may be determined by the operator operating on the spot. After the movement is completed, the location of the jamming wave generator and the communication to the base station 15 need only be performed once before the jamming signal is generated. Thereafter, the GPS reception is performed until the jamming wave generator 13 is moved. The part 22 may not be used.

  The interference wave generation unit 25 transmits the total interference wave generation device position information 17 to its own mobile body 14 and then radiates the interference wave 18 in the direction of arrival of the counterpart mobile body 12 via the interference wave antenna unit 26. The output timing of the interference wave 18 is not shown in FIG. 2, for example, but the control unit in the interference wave generator 13 stores the time when the interference wave generator position information 16 is output from the communication antenna unit 24. The time may be measured using a counter or the like provided in the control unit, and an interference wave generation instruction may be given to the interference wave generation unit 25 after a certain time.

  FIG. 3 shows a functional block diagram related to the present invention among the base stations 15 used in the first embodiment. The communication antenna unit 31 of the base station 15 receives the interference wave generator position information 16 transmitted from each interference wave generator 13. The interference wave generator position information 16 received by the communication antenna unit 31 is subjected to reception processing and demodulation processing such as down-conversion from the carrier frequency band to the intermediate frequency band or baseband frequency band by the communication processing unit 32, and is kept secret. The data is output to the processing unit 33.

  The concealment processing unit 33 temporarily accumulates the interference wave generation device position information 16 transmitted from each interference wave generation device 13 so as to consolidate it into all the interference wave generation device position information 17 and performs a concealment process. The concealment process is performed in order to prevent the information content from being intercepted when transmitting all the disturbing wave generation device position information 17 from the base station 15 to the mobile unit 14.

  If the interference wave generator position information 16 is transmitted from the interference wave generator 13 to the base station 15 without being concealed, the interference wave generator position information 16 is aggregated and concealed as described above. If the interference wave generator position information 16 is concealed from the interference wave generator 13 and transmitted to the base station 15, the concealment processing unit 33 of the base station 15 temporarily stores it in the total interference wave generator position information 17. Only the functions to be aggregated may be used.

  When the confidential processing is performed and transmitted to the base station 15, the confidential processing unit 33 of the base station 15 cancels the confidentiality of each interfering wave generator position information 16 once, performs temporary storage, and performs scramble processing to prevent interception. After performing the above information processing process, it may be aggregated in the total interference wave generator position information 17 and the concealment process may be performed again.

  The communication processing unit 34 performs a transmission process such as a modulation process for transmitting the all-interference wave generator position information 17 subjected to the concealment process to its own mobile unit 14 and a frequency up-conversion to a carrier band. The communication antenna unit 35 transmits the total interference wave generator position information 17 subjected to the transmission process to its own mobile unit 14.

  Note that the base station 15 is not assumed to be used as being moved like the interference wave generator 13. Therefore, the base station 15 may fix the installation position. The communication antenna unit 31 and the communication antenna unit 35 may also serve as an antenna unit as long as signals to be transmitted and received can be separated.

  FIG. 4 is a functional configuration diagram relating to the GPS interference wave suppressing device 41 mounted on its own mobile body 14 in the first embodiment. The GPS array antenna unit 42 in the GPS interference wave suppressing device 41 receives a GPS positioning signal transmitted from the GPS satellite 11.

  The GPS positioning processing unit 43 that functions as a GPS positioning device includes an RF front end unit 44, a beamforming processing unit 45, and a GPS baseband unit 46. The GPS positioning signal output from the GPS array antenna unit 42 is input to the RF front end unit 44 in the GPS positioning processing unit 43, and the GPS positioning signal is down-converted from the carrier frequency band to the intermediate frequency band or the baseband frequency band. In addition, reception processing such as conversion of a GPS positioning signal, which is an analog signal, into a digital signal using an analog / digital converter or the like is performed.

  The digitized GPS positioning signal output from the RF front end unit 44 is input to the beam forming processing unit 45, and the phase and amplitude are adjusted. At this time, the interference wave arrival direction information output from the interference wave arrival direction specifying unit 47 described later is input to the beamforming processing unit 45, and the gain of the GPS array antenna unit 42 is adjusted by adjusting the phase and amplitude. As a result, the gain is reduced so that the interference wave arrival direction is a null point. This eliminates the influence of the interference wave 18.

  The GPS positioning signal from which the influence of the interference wave 18 is eliminated by the beamforming processing unit 45 is input to the GPS baseband unit 46, and the pseudorange amount, Doppler amount, and carrier phase amount are obtained based on the GPS positioning signal. GPS positioning calculation processing is performed. Then, the position information and velocity information of the mobile unit 14 are calculated from the obtained pseudo distance amount, Doppler amount, and carrier phase amount.

  Note that in order to obtain the position information and speed information of the mobile body 14 from the GPS positioning signal, the pseudo distance amount must be obtained. However, it is sufficient that either the Doppler amount or the carrier phase amount can be obtained, and the position information and speed information of the mobile unit 14 are obtained by combining the pseudo distance amount and the Doppler amount, or the pseudo distance amount and the carrier phase amount. The obtained position information and speed information of the mobile body 14 are output to the interference wave arrival direction specifying unit 47.

  In the interference wave arrival direction specifying unit 47, the position information and velocity information output from the GPS baseband unit 46, acceleration information and angular velocity information output from the inertia measurement unit 48 described later, and all of the base station 15 transmit. A calculation process is performed using the interference wave generator position information 17 to identify the arrival direction of the interference wave. The processing of the interference wave arrival direction specifying unit 47 will be described later with reference to FIG.

  The inertial measurement unit 48 is equipped with, for example, an angular velocity sensor such as an acceleration sensor or a gyro sensor, measures the acceleration and angular velocity of its own mobile body 14, and outputs it to the interference wave arrival direction specifying unit 47. In addition, when the initial value regarding the position and posture angle of the moving body 14 is given to the inertia measuring unit 48, the acceleration information measured by the acceleration sensor and the angular velocity measured by the gyro sensor or the like are integrated. Thus, the position information and posture angle information of the mobile body 14 may be obtained and output to the interference wave arrival direction specifying unit 47.

  When the initial values regarding the position and posture angle of the mobile unit 14 are given to the interference wave arrival direction specifying unit 47, the above processing for obtaining the position information and the posture angle information of the mobile unit 14 is performed as follows. The identification unit 47 may perform this. In the following description, it is assumed that the inertia measuring unit 48 outputs position information, speed information, and posture angle of its own mobile body 14.

  The total interference wave generating device position information 17 is transmitted from the base station 15 and received by the communication antenna unit 49 in the GPS interference wave suppressing device 41 mounted on its own mobile unit 14. The total interference wave generator position information 17 received by the communication antenna unit 49 is input to the communication processing unit 50, receiving processing such as down-conversion from the carrier frequency band to the intermediate frequency band or the baseband frequency band, and demodulation. Processing is performed. The total interference wave generator position information 17 demodulated by the communication processing unit 50 is input to the concealment cancellation processing unit 51.

  The concealment release processing unit 51 releases the concealment of the total interference wave generator position information 17 that has been concealed by the concealment processing unit 33 of the base station 15. The total disturbing wave generating device position information 17 whose concealment is canceled by the concealment cancellation processing unit 51 is output to the disturbing wave arrival direction specifying unit 47.

  FIG. 5 is a diagram illustrating an example of a method for specifying the direction of arrival of an interfering wave when the present invention is used. In order to specify the interference wave arrival direction, the position information of the own mobile body 14, the position information of the interference wave generator 13, and the attitude angle of the mobile body 14 are necessary. Accordingly, the interference wave arrival direction specifying unit 47 receives the position information and speed information of the mobile unit 14 from the GPS baseband unit 46, and the position information, speed information, and attitude angle information of the mobile unit 14 from the inertia measurement unit 48. However, the total interference wave generator position information 17 is input from the concealment cancellation processing unit 51.

  When the inertial measurement unit 48 is mounted on the GPS interference wave suppressing device 41, the position information, posture angle, and the like of the moving body 14 are obtained by integrating the acceleration information and the angular velocity information measured by the sensor. Can do. However, since the acceleration information and the angular velocity information measured by the sensor include an error, the error is accumulated with time by performing the integration process, and the guidance to the target point may be erroneous.

  Therefore, the position information of the mobile unit 14 is based on the position information and speed information based on the sensor measurement value obtained from the inertia measurement unit 48 and the GPS positioning signal obtained from the GPS baseband unit 46. The calculation is performed by combining the position information and speed information.

  If it can be determined that the accuracy of the position information obtained from the GPS positioning signal is good, the position information of the mobile unit 14 may be obtained only from the GPS positioning signal. In that case, acceleration information, speed information, and position information based on the acceleration sensor in the inertial measurement unit 48 may not be used.

  As a result, the position information 16 of the mobile body 14 obtained by the GPS interference wave suppression device 41 and the interference wave generator position information 16 obtained from the total interference wave generator position information 17 input from the base station 15 are obtained. It is possible to determine the direction of the interference wave generator 13 as viewed from its own mobile body 14. In FIG. 5, for the sake of simplicity, the description will be made in the case of a two-dimensional plane. A reference for obtaining a posture angle θ1, for example, a posture angle initial direction is given to the mobile body 14 of itself. Therefore, the angle θ2 formed by the initial direction of the posture angle and the direction of the disturbing wave generator 13 viewed from the moving body 14 can be obtained.

  Therefore, as shown in FIG. 5, the interference wave arrival direction specifying unit 47 can determine the angle θ1 + θ2 of the interference wave generator 13 as viewed from the mobile body 14, that is, the interference wave arrival direction. The obtained interference wave arrival direction information is output to the beamforming processing unit 45.

  In practice, in order to specify the direction of interference wave arrival in the three-dimensional space, the same calculation process may be performed for the angle and the azimuth and azimuth.

  As described above, since the interference wave arrival direction can be specified by using the GPS positioning signal, the angular velocity, and the interference wave generator position information 16, the GPS antenna 42 is configured so that the interference wave arrival direction is set as a null point. The gain can be reduced and the influence of the interference wave 18 on the GPS positioning signal can be eliminated.

  Further, since the jamming wave generator position information 16 is transmitted as known information to the GPS jamming wave suppression device 41 of its own mobile body 14, the conventional technique for performing adaptive signal processing with the jamming wave generator position information 16 unknown. In comparison, the estimation accuracy of the interference wave arrival direction is maintained or improved, and it is possible to reduce the load of the circuit scale and calculation processing capacity of the signal processing.

Embodiment 2. FIG.
FIG. 6 shows a functional configuration diagram related to the present invention in the interference wave generator 13 used in the second embodiment. The difference from FIG. 2 is that fraud signal information indicating what kind of GPS positioning fraud signal is to be generated by the interference processing section 25 in the communication processing section 23.

  Information regarding the type of the deceiving signal output from the interference wave generating unit 25 is input to the communication processing unit 23 and added with the disturbing wave generating device position information 16 as deceiving signal information 61, similar to the disturbing wave generating device position information 16. Then, transmission processing such as modulation processing and frequency up-conversion to a carrier band, and concealment processing are performed as necessary. The deceiving signal information 61 modulated and transmitted by the communication processing unit 23 is transmitted to the base station 15 via the communication antenna unit 24.

  Further, as in the first embodiment, after transmitting all the deceiving signal information 71 described later to its own mobile unit 14, the interfering wave generating unit 25 transmits the deceiving signal 62 via the interfering wave antenna unit 26. Radiates in the direction of arrival. The output timing of the deception signal 62 may be the same as in the first embodiment.

  The base station 15 performs the same processing as in the first embodiment on the fraud signal information 61 transmitted from each interference wave generator 13 and collects the fraud signal information 61 by collecting the fraud signal information 61 into its own mobile unit 14. 71 is transmitted.

  FIG. 7 is a functional configuration diagram relating to the GPS interference wave suppressing device 41 mounted on the mobile body 14 of the second embodiment. The difference from FIG. 4 is that all the deception signal information 71 transmitted from the base station 15 is deciphered by the deciphering processing unit 51 in the GPS jamming wave suppressing device 41, and the deception signal is included in the all deception signal information 71. The point is that information 72 relating to the type of data is output to the GPS baseband unit 46.

  All deceiving signal information 71 transmitted from the base station 15 is received by the communication antenna unit 49 in the GPS jamming wave suppressing device 41 mounted on the mobile unit 14 of itself. All fraud signal information 71 received by the communication antenna unit 49 is input to the communication processing unit 50, where reception processing such as down-conversion from the carrier frequency band to the intermediate frequency band or baseband frequency band, demodulation processing, and the like are performed. Done.

  All fraud signal information 71 demodulated by the communication processing unit 50 is input to the secrecy cancellation processing unit 51. The concealment release processing unit 51 releases the concealment of all fraud signal information 71 that has been concealed by the concealment processing unit 33 of the base station 15. All deceiving signal information 71 that has been deciphered by the deciphering processing unit 51 includes all interference signal generator position information 17 and information 72 regarding the type of deception signal. The information 72 regarding the type of deception signal is GPS-based. The data is output to the band unit 46. Further, the total interference wave generator position information 17 is output to the interference wave arrival direction specifying unit 47.

  The GPS baseband unit 46, based on the input information 72 regarding the type of deceptive signal, for example, a PRN number (Pseudo Random Noise code number: assigned) so that GPS positioning signals from each GPS satellite 11 can be received separately. The GPS positioning signal corresponding to the PRN number of the deception signal is excluded from the calculation process from the information of the pseudo noise code number).

  By giving the total interference wave generator position information 17 to the interference wave arrival direction specifying unit 47, the GPS positioning deception signal can be eliminated as in the first embodiment. In addition, since the information 72 regarding the type of fraud signal is obtained, the GPS baseband unit 46 can also eliminate it. Therefore, it is possible to improve the accuracy of the GPS positioning and the interference wave arrival direction specification.

  For example, in the communication processing unit 23 of the interfering wave generator 13, each of the interfering wave generating device position information 17 and the information 72 regarding the type of fraud signal can be separated and received by the GPS interfering wave suppressing device 41. May be attached.

  And the header determination function which determines whether it is the header of the interference wave device position information or the header of the information regarding the type of the fraud signal is added to the concealment cancellation processing unit 51 of the GPS interference wave suppressing device 41. If the information determined by the header determination function is the interference wave generator position information, it may be output to the interference wave arrival direction specifying unit 47, and if it is information related to the type of fraud signal, it may be output to the GPS baseband processing unit 46.

  As described above, not only the interference wave generator position information but also the information regarding the type of the fraud signal is transmitted from the interference wave generator 13 to the GPS interference wave suppression device 41 of the mobile unit 14 via the base station 15. By eliminating the GPS positioning signal corresponding to the GPS positioning fraud signal from the GPS positioning calculation process, the influence of the fraud signal is eliminated, the GPS positioning accuracy is improved, and the GPS positioning signal excluding the fraud signal is disturbed. The direction of wave arrival can be specified.

  Moreover, since it is not necessary to perform calculation processing using a GPS positioning signal corresponding to an unnecessary deception signal at the time of GPS positioning calculation, there is an effect that it is possible to reduce the load of calculation processing capability.

  Further, the deception signal is transmitted as known information to the GPS jamming wave suppression device 41 of its own mobile unit 14, and it is possible to take a countermeasure against the deception signal with a configuration almost the same as that of the first embodiment used for the jamming signal countermeasure. Therefore, the signal processing circuit and the device scale are compared with the device that combines the configuration and function of the countermeasure that made the jamming signal unknown (for example, Patent Document 1) and the countermeasure that made the fraud signal unknown (for example, Patent Document 2). It is possible to prevent the increase in the number of times.

  In order to perform GPS positioning, it is necessary to obtain four parameters, that is, latitude, longitude, altitude, and time correction amount of the time measuring device mounted on the GPS positioning device. Therefore, four or more GPS positioning signals are required. It is. However, since the number of observation satellites often exceeds the minimum four required for positioning calculation, even if the GPS positioning signal corresponding to the deception signal is excluded, if there are four or more GPS positioning signals, use them It is possible to obtain the position information of the own mobile body 14.

  Further, when there are only four GPS positioning signals received and at least one of them is a deception signal, the number of usable GPS positioning signals is three or less. Therefore, since there is a possibility that the GPS positioning result is incorrect, there is a possibility that the interference wave arrival direction specification using the GPS positioning signal is erroneous. In this case, the GPS positioning calculation process in the GPS baseband unit 46 is stopped, the position information of the mobile unit 14 is obtained using only the acceleration information and the angular velocity information of the inertial measurement unit 48, and the interference wave arrival direction is specified. May be controlled.

  Although the above embodiment has been described using the GPS developed in the United States, the present invention is based on the Russian GLONASS (GLOBal NAvigation) which is a global satellite positioning system capable of accurately measuring its own position. Satelite System) and GALILEO currently in progress in Europe are equally applicable.

2 is an example of system operation in the first embodiment. It is a functional block diagram regarding this invention among the jamming wave generators used for Embodiment 1. FIG. It is a function block diagram regarding this invention among the base stations used for Embodiment 1. FIG. It is a functional block diagram regarding the GPS jamming wave suppression apparatus mounted in the own mobile body used for Embodiment 1. FIG. It is a figure which shows an example of the interference wave arrival direction identification method at the time of using this invention in Embodiment 1. FIG. It is a functional block diagram regarding this invention among the jamming wave generators used for Embodiment 2. FIG. It is a functional block diagram regarding the GPS jamming wave suppression apparatus mounted in the own mobile body used for Embodiment 2. FIG.

Explanation of symbols

11. GPS satellites12. 10. Opponent mobile body Interference generator 14. Self-moving body 15. Base station 16. Interference wave generator position information 17. Total jammer position information 18. Interference wave 21. GPS antenna section 22. GPS receiver 23. Communication processing unit 24. Communication antenna unit 25. Interference wave generator 26. Interference wave antenna 31. Communication antenna unit 32. Communication processing unit 33. Concealment processing unit 34. Communication processing unit 35. Communication antenna unit 41. GPS jamming wave suppression device 42. GPS array antenna unit 43. GPS positioning processing unit 44. RF front end 45. Beam forming processing unit 46. GPS baseband unit 47. Interference wave arrival direction identifying unit 48. Inertial measurement unit 49. Communication antenna unit 50. Communication processing unit 51. Secret release processing unit 61. Deception signal information 62. Deception signal 71. Total deception signal information 72. Information about the types of deception signals

Claims (7)

A GPS interference wave suppressing device mounted on its own mobile body for suppressing malfunction of its own GPS positioning device due to interference waves,
A communication antenna for receiving an interference wave countermeasure signal including at least position information of the interference wave generating device, which is output from the interference wave generating device for generating the interference wave for causing the GPS positioning device mounted on the opponent mobile body to malfunction. ,
A GPS antenna for receiving GPS positioning signals from GPS satellites;
A GPS positioning device that outputs position information of the mobile body using the GPS positioning signal received by the GPS antenna;
An angular velocity sensor for measuring an angular velocity for obtaining a posture angle of the mobile body of the self;
Using the interference wave countermeasure signal received by the communication antenna, the position information of the mobile body output from the GPS positioning device, and the angular velocity output from the angular velocity sensor, the interference wave arrival direction is determined. A GPS interfering wave suppressing device comprising: an interfering wave arrival direction specifying unit for specifying. The jamming wave arrival direction identifying unit is
Using the positional information of the jamming wave generator received by the communication antenna and the positional information of the mobile unit output from the GPS positioning unit, the direction of the jamming wave generator with respect to the mobile unit Seeking
2. The GPS interference according to claim 1, wherein an interference wave arrival direction is specified by using a direction angle of the interference wave generator with respect to the mobile body and an attitude angle of the mobile body obtained from the angular velocity. Wave suppression device. The jamming countermeasure signal includes information indicating the type of GPS positioning deception signal emitted by the jamming wave generator,
The GPS positioning device is
The information indicating the type of the GPS positioning deception signal received by the communication antenna is used to exclude the GPS positioning signal corresponding to the deception signal and output the position information of the mobile unit. Item 3. The GPS interference wave suppressing device according to Item 2. The GPS positioning device has a beam forming processing unit for adjusting the gain of the GPS antenna,
The interference wave arrival direction information specified by the interference wave arrival direction specifying unit is input to the beamforming processing unit, and the interference wave is suppressed by adjusting the gain of the GPS antenna in the interference wave arrival direction. The GPS jamming wave suppression apparatus of Claim 2 or Claim 3. Interference wave for causing malfunction of GPS positioning device mounted on the other party mobile body, and interference wave countermeasure signal including position information of at least interference wave generator for suppressing malfunction of own GPS positioning device due to said interference wave An output interference generator,
The GPS interference wave suppression device according to claim 1, wherein the GPS positioning signal is mounted on its own mobile body and is output from a plurality of GPS satellites, and the interference wave countermeasure signal output from the interference wave generator is received. so,
The GPS interference wave suppression system, wherein the mobile body suppresses the interference wave using the GPS positioning signal and the interference wave countermeasure signal. 6. The GPS jamming wave suppression system according to claim 5, wherein the jamming wave generation device generates a jamming wave after transmitting the jamming wave countermeasure signal to the GPS jamming wave suppression device. There are a plurality of the interference wave generating devices, and all the interference wave countermeasure signals output from the interference wave generating device are transmitted to one base station, and the interference signal countermeasure signals are aggregated at the base station, and the GPS interference wave The GPS interference wave suppression system according to claim 5, wherein the GPS interference wave suppression system is transmitted to a suppression device.

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