Passive radar system based on target positioning and target positioning method

Abstract

The present application discloses a passive radar system based on target positioning and a target positioning method. The system includes a transmitting station and a receiving station; the transmitting station performs preset signal processing on the radio signal sent by the target satellite, obtains a second reference signal, and broadcasts the second reference signal; the receiving station performs preset signal processing on the radio signal sent by the target satellite, obtains a first reference signal, which is a signal with the same spectrum as the second reference signal, and the signal acquisition time of the first reference signal is the same as the signal acquisition time of the second reference signal; and receives at least one detection signal after the target to be measured reflects the second reference signal. The radar monitoring center obtains time difference positioning information based on the first reference signal and at least one detection signal. It can be seen that the system does not need to consider the reception restrictions of the reference signal due to the curvature of the earth.

Description

Technical Field

[0001] The present application relates to the field of passive radar technology, and in particular to a passive radar system based on target positioning and a target positioning method. Background Art

[0002] At present, in the ground-based air defense warning system with active radar as the main detection system, various new technologies have been promoted and applied to improve the comprehensive confrontation capability of active radar, such as ultra-low sidelobe antenna, digital beam forming, adaptive processing, target recognition and imaging, etc. At the same time, people are also working hard to develop passive radars that do not radiate electromagnetic signals. Since passive radar systems are relatively simple, low-cost, and do not radiate electromagnetic signals outward, they are not easily detected by enemy reconnaissance systems. Therefore, the improvement and development of passive radar systems has become an important means of detection.

[0003] like Figure 1 As shown, the traditional passive radar system includes a transmitting station and a receiving station. The transmitting station can be a radio station, a television station or a communication station. The receiving station can include a receiving unit A and a receiving unit B. The transmitting station broadcasts a reference signal, and the receiving unit A receives the detection signal reflected by the target aircraft through an antenna, and the receiving unit B directly receives the reference signal sent by the transmitting source. The radar monitoring center uses the reference signal and the detection signal reflected by the target aircraft to perform correlation processing, generate target time difference positioning information, and send the information to the radar monitoring center to achieve positioning and tracking of air targets.

[0004] However, the inventors found that the above passive radar system must obtain the reference signal sent by the transmitting station when working normally, but due to the limitation of the earth's curvature, the distance between the receiving station and the transmitting station cannot be too far, generally not more than 100 kilometers. If the distance is too far, the signal strength of the reference signal received by the receiving station will become weak, affecting the accuracy of positioning the aerial target. Summary of the invention

[0005] The embodiments of the present application provide a passive radar system based on target positioning and a target positioning method, so as to solve the problem in the prior art that a receiving station is limited by the curvature of the earth in receiving reference signals, and improve the accuracy of positioning and tracking aerial targets.

[0006] In a first aspect, a passive radar system based on target positioning is provided, the system comprising: a transmitting station, a receiving station and a radar monitoring center;

[0007] A transmitting station is used to receive a radio signal sent by a target satellite; perform preset signal processing on the radio signal to obtain a second reference signal; and broadcast the second reference signal;

[0008] A receiving station is used to receive a radio signal sent by a target satellite; perform preset signal processing on the radio signal to obtain a first reference signal, wherein the first reference signal and the second reference signal are signals with the same frequency spectrum, and the signal acquisition time of the first reference signal is the same as the signal acquisition time of the second reference signal; receive at least one detection signal reflected by the target to be measured, wherein the detection signal is a signal after the target to be measured reflects the second reference signal;

[0009] The radar monitoring center is used to obtain the time difference positioning information of the target to be detected based on the first reference signal and at least one detection signal.

[0010] In an optional implementation, the transmitting station includes a first receiving device and a transmitting device connected to the first receiving device, and each receiving station includes the first receiving device and at least one second receiving device;

[0011] The first receiving device of the transmitting station is used to receive the radio signal sent by the target satellite; perform preset signal processing on the radio signal to obtain a second reference signal;

[0012] A sending device, configured to broadcast and send a second reference signal;

[0013] The first receiving device of the receiving station is used to receive the radio signal sent by the target satellite; perform preset signal processing on the radio signal to obtain a first reference signal;

[0014] The second receiving device is used to receive the detection signal reflected by the target to be detected.

[0015] In an optional implementation, the first receiving device includes: a satellite receiving unit, a GPS clock unit, a synchronization adaptation unit and a modulation unit;

[0016] A satellite receiving unit, used for receiving radio signals sent by a target satellite;

[0017] The GPS clock unit is used to output a preset synchronization clock control signal to the synchronization adaptation unit;

[0018] A synchronization adaptation unit, configured to obtain a synchronization signal based on a preset synchronization clock control signal and a radio signal;

[0019] The modulation unit is used to adopt a preset modulation mechanism to perform signal modulation on the synchronization signal to obtain a reference signal.

[0020] In an optional implementation, the system further includes a storage device;

[0021] A storage device is used to record the signal acquisition time of the first reference signal and the signal reception time of at least one detection signal.

[0022] In an optional implementation, the radar monitoring center is specifically configured to perform coherent detection on the first reference signal and at least one detection signal to obtain a detection result, wherein the detection result includes a detection signal corresponding to the second reference signal matching the first reference signal;

[0023] Based on the detection results, signal acquisition time and signal reception time, the time difference positioning information of the target to be detected is obtained.

[0024] In an optional implementation, the target time difference positioning information includes a time delay difference between a first reference signal and at least one detection signal.

[0025] In a second aspect, a target positioning method is provided, which may include:

[0026] Receive radio signals sent by target satellites;

[0027] Performing preset signal processing on the radio signal to obtain a reference signal;

[0028] Broadcasting a reference signal;

[0029] Based on the reference signal and at least one detection signal received and reflected by the target to be detected, the time difference positioning information of the target to be detected is obtained.

[0030] In an optional implementation, performing preset signal processing on the radio signal to obtain a reference signal includes:

[0031] Acquiring a synchronization signal based on a preset synchronization clock control signal and a radio signal;

[0032] A preset modulation mechanism is adopted to perform signal modulation on the synchronization signal to obtain a reference signal.

[0033] In an optional implementation, before acquiring the time difference positioning information of the target to be measured, the method further includes:

[0034] The signal acquisition time of the reference signal and the signal reception time of at least one detection signal are recorded.

[0035] In an optional implementation, acquiring time difference positioning information of the target to be measured based on the reference signal and at least one detection signal reflected by the received target to be measured includes:

[0036] Performing coherent detection on the reference signal and at least one detection signal to obtain a detection result, wherein the detection result includes a detection signal corresponding to a second reference signal matching the first reference signal;

[0037] Based on the detection results, signal acquisition time and signal reception time, the time difference positioning information of the target to be detected is obtained.

[0038] In an optional implementation, the target time difference positioning information includes a time delay difference between a first reference signal and at least one detection signal.

[0039] In a third aspect, an electronic device is provided, the electronic device comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus;

[0040] Memory, used to store computer programs;

[0041] The processor is used to implement the method steps described in any one of the second aspects when executing the program stored in the memory.

[0042] In a fourth aspect, a computer-readable storage medium is provided, wherein a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a processor, any method step described in the second aspect is implemented.

[0043] The system includes a transmitting station and a receiving station; after receiving the radio signal sent by the target satellite, the transmitting station performs preset signal processing on the radio signal to obtain a second reference signal; broadcasts and sends the second reference signal; after receiving the radio signal sent by the target satellite, the receiving station performs preset signal processing on the radio signal to obtain a first reference signal, the first reference signal and the second reference signal are signals with the same spectrum, and the signal acquisition time of the first reference signal is the same as the signal acquisition time of the second reference signal; receives at least one detection signal reflected by the target to be measured, the detection signal is the signal after the target to be measured reflects the second reference signal; the radar monitoring center obtains the time difference positioning information of the target to be measured based on the first reference signal and the at least one detection signal. It can be seen that compared with the prior art, the radar monitoring center replaces the reference signal received from the transmitting station in the prior art with the reference signal received by the first receiving device of the receiving station, thereby not needing to consider the reception restriction of the reference signal by the earth curvature, and by obtaining the same reference signal, the consistency of the reference signal is guaranteed, and the accuracy of target tracking is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A schematic diagram of the structure of a traditional passive radar system is provided;

[0045] Figure 2A A schematic diagram of the structure of a passive radar system based on target positioning provided by an embodiment of the present invention;

[0046] Figure 2B A schematic diagram of the structure of another passive radar system based on target positioning provided by an embodiment of the present invention;

[0047] Figure 3A for Figure 2BA structural schematic diagram of a first receiving device;

[0048] Figure 3B A schematic diagram of the structure of another passive radar system based on target positioning provided by an embodiment of the present invention;

[0049] Figure 4 A schematic diagram of a flow chart of a target positioning method provided by an embodiment of the present invention;

[0050] Figure 5 A schematic diagram of the structure of a target positioning device provided by an embodiment of the present invention;

[0051] Figure 6 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0053] The passive radar system based on target positioning provided by the embodiment of the present invention can be as follows: Figure 2A As shown. The system may include: a transmitting station 210, a receiving station 220 and a radar monitoring center 230. In the system provided by the embodiment of the present invention, the receiving station 220 and the transmitting station 210 both include the same first receiving device, and obtain reference signals through received radio signals respectively. Compared with the prior art, the problem that the receiving station must receive the reference signal of the transmitting station due to the limitation of the curvature of the earth is solved.

[0054] The system is described in detail below in conjunction with the accompanying drawings. The transmitting station may be a radio station, a television station or a communication station. The following description is made by taking the transmitting station as a television station as an example.

[0055] like Figure 2B The transmitting station 210 shown includes a first receiving device 211 and a transmitting device 212. The receiving station 220 includes a first receiving device 211 and at least one second receiving device 221. The first receiving device 211 of the transmitting station 210 is used to receive a radio signal (or "satellite TV signal") sent by a target satellite; perform preset signal processing on the radio signal to obtain a second reference signal.

[0056] The preset signal processing may include denoising, demodulation, clock synchronization, modulation, etc. of the radio signal.

[0057] The first receiving device 211 can lock the position of the target satellite, such as obtaining the position of the target satellite based on GPS positioning technology. The first receiving device 211 receives the radio signal sent by the target satellite and obtains the second reference signal based on a preset signal processing technology.

[0058] like Figure 3A As shown, the first receiving device 211 may include a satellite receiving unit 2111, a GPS clock unit 2112, a synchronization adaptation unit 2113 and a modulation unit 2114;

[0059] The satellite receiving unit 2111 may be a satellite antenna and a receiver. The satellite antenna is used to receive radio signals sent by a target satellite, and the receiver is used to demodulate the radio signals into baseband signals.

[0060] The GPS clock unit 2112 is used to output a preset synchronization clock control signal to the synchronization adaptation unit 2113 for time synchronization of the baseband signal radio signal.

[0061] The synchronization adaptation unit 2113 is used to obtain a synchronization signal, that is, a time-synchronized baseband signal, based on a preset synchronization clock control signal and a baseband signal.

[0062] The synchronization adaptation unit 2113 can receive Beidou radio signals and perform time synchronization on the baseband signal demodulated from the Beidou radio signals according to the Beidou timing control signal sent by the Beidou standard synchronization clock device.

[0063] It should be noted that, in order to achieve time synchronization with the radio signal received in the receiving station, the preset synchronization clock control signal of the first receiving device in the receiving station is the same as the preset synchronization clock control signal of the transmitting station.

[0064] The modulation unit 2114 is used to adopt a preset modulation mechanism to perform signal modulation on the synchronization signal to obtain a second reference signal, that is, a second radio frequency signal.

[0065] Taking the transmitting station as a television station as an example, the modulation unit 2114 modulates the synchronization signal obtained based on the satellite TV signal into a second reference signal of the digital television terrestrial broadcasting transmission system frame structure, channel coding and modulation (Digital Television Terrestrial Multimedia Broadcasting, TDMB) transmission standard.

[0066] The sending device 212 is used to broadcast the second reference signal. The sending device 212 amplifies the received second reference signal and then broadcasts it to the outside.

[0067] The first receiving device 211 of the receiving station 220 is used to receive the radio signal sent by the target satellite; perform preset signal processing on the radio signal to obtain a first reference signal, that is, a first radio frequency signal.

[0068] Since the receiving station and the transmitting station both include the same first receiving device and both contain the same preset synchronization clock control signal, the first reference signal and the second reference signal obtained by the receiving station are signals with the same spectrum, and the signal acquisition time of the first reference signal is the same as the signal acquisition time of the second reference signal. For example, the transmitting station 210 receives a radio signal at time t0 and the receiving station 220 receives a radio signal at time t1. After being demodulated into baseband signals respectively, the baseband signal of the transmitting station 210 at time t0 and the baseband signal of the receiving station 220 at time t1 can be synchronized into the baseband signal at time t2 through the same synchronization clock control signal.

[0069] The second receiving device 221 is used to receive a detection signal reflected by the target to be measured, where the detection signal is a signal after the target to be measured reflects the second reference signal. The second receiving device 221 may be an echo antenna.

[0070] After the ground transmitting station sends out the second reference signal and the receiving station obtains the first reference signal, if there is no target to be measured within the detection range of the passive radar system, the first receiving device of the receiving station obtains the first reference signal, but the second reference signal sent by the transmitting station will not be reflected by the target to be measured, and the second receiving device of the receiving station cannot receive the detection signal (or "reflected echo signal");

[0071] If a target to be detected appears within the detection range of the passive radar system, the first receiving device of the receiving station acquires the first reference signal, and the second receiving device of the receiving station receives the detection signal reflected by the target to be detected (or "reflected echo signal"). That is to say, at this time, the receiving station can not only acquire the first reference signal, but also receive the detection signal. Since the second receiving device can receive at least one detection signal, the at least one detection signal includes the detection signal corresponding to the second reference signal.

[0072] The radar monitoring center 230 is used to obtain the time difference positioning information of the target to be detected based on the first reference signal and at least one detection signal received by at least one second receiving device.

[0073] The first reference signal and at least one detection signal are coherently detected to obtain a detection result, wherein the detection result includes a detection signal corresponding to the second reference signal sent by the sending device; and based on the detection result and the signal reception time, the time difference positioning information of the target to be measured is obtained. The target time difference positioning information includes the delay difference between the first reference signal and the at least one detection signal.

[0074] It should be noted that the radar monitoring center 230 can also estimate parameters such as the arrival direction and Doppler frequency shift of at least one detection signal reflected by the target to be measured based on the first reference signal and at least one detection signal received by at least one second receiving device, thereby further improving the accuracy of target positioning.

[0075] In one example, the transmitting station of the passive radar system is a TV station. Figure 3B As shown, the TV station's satellite antenna receives the radio signal transmitted by the Beidou satellite and demodulates the radio signal into a baseband signal. The synchronization adaptation module synchronizes the baseband signal under the action of the Beidou clock module. Then the signal modulation module performs signal modulation processing on the synchronized baseband signal to obtain a reference signal. The transmitter amplifies the reference signal and broadcasts it through the transmitting antenna.

[0076] The satellite antenna of the receiving station of the passive radar system also receives the radio signal transmitted by the Beidou satellite and demodulates the radio signal into a baseband signal. The synchronization adaptation module synchronizes the clock of the baseband signal under the action of the Beidou clock module, and then the signal modulation module modulates the synchronized baseband signal to obtain a reference signal. The signal modulation module transmits the reference signal to the radar monitoring center. The reference signal obtained by the receiving station has the same spectrum as the reference signal obtained by the transmitting station, and the signal acquisition time of the first reference signal is the same as the signal acquisition time of the second reference signal.

[0077] When there is a target to be measured within the detection range of the passive radar system, at least one echo antenna of the receiving station can receive at least one detection signal reflected by the target to be measured. After that, the receiving station performs coherent detection on the reference signal obtained by itself and at least one detection signal to obtain a detection signal matching the reference signal, which is a detection signal corresponding to the reference signal sent by the antenna of the transmitting station. The time difference operation is used to obtain the time difference positioning information of the target to be measured based on the signal receiving time of the matched detection signal and the signal obtaining time of the reference signal obtained by the receiving station itself, thereby realizing the positioning and tracking of the target to be measured.

[0078] The system includes a transmitting station and a receiving station; after receiving the radio signal sent by the target satellite, the transmitting station performs preset signal processing on the radio signal to obtain a second reference signal; broadcasts and sends the second reference signal; after receiving the radio signal sent by the target satellite, the receiving station performs preset signal processing on the radio signal to obtain a first reference signal, the first reference signal and the second reference signal are signals with the same spectrum, and the signal acquisition time of the first reference signal is the same as the signal acquisition time of the second reference signal; receives at least one detection signal reflected by the target to be measured, the detection signal is the signal after the target to be measured reflects the second reference signal; the radar monitoring center obtains the time difference positioning information of the target to be measured based on the first reference signal and the at least one detection signal. It can be seen that compared with the prior art, the radar monitoring center replaces the reference signal received from the transmitting station in the prior art with the reference signal received by the first receiving device of the receiving station, thereby not needing to consider the reception restriction of the reference signal by the earth curvature, and by obtaining the same reference signal, the consistency of the reference signal is guaranteed, and the accuracy of target tracking is improved.

[0079] Figure 4 A flow chart of a target positioning method provided by an embodiment of the present invention. Figure 4 As shown, the method may include:

[0080] Step 410: Receive a radio signal sent by a target satellite.

[0081] The first receiving device of the receiving station in the passive radar system receives the radio signal transmitted by the target satellite.

[0082] At the same time, the first receiving device of the transmitting station in the passive radar system also receives the radio signal sent by the same target satellite.

[0083] Step 420: Perform preset signal processing on the radio signal to obtain a reference signal.

[0084] The first receiving device of the receiving station in the passive radar system performs preset signal processing on the radio signal to obtain a reference signal.

[0085] Specifically, based on a preset synchronous clock control signal and a radio signal, a synchronization signal is obtained; and a preset modulation mechanism is used to modulate the synchronization signal to obtain a reference signal.

[0086] At the same time, the first receiving device of the transmitting station also performs the same preset signal processing on the radio signal to obtain the same reference signal as that of the receiving station.

[0087] Step 430: Broadcast a reference signal.

[0088] The transmitting device of the receiving station in the passive radar system broadcasts the acquired reference signal.

[0089] Step 440: Acquire time difference positioning information of the target to be measured based on the reference signal and at least one detection signal reflected by the received target to be measured.

[0090] Before performing this step, the receiving station records the signal acquisition time of the reference signal and the signal reception time of at least one detection signal.

[0091] Performing coherent detection on the reference signal and at least one sounding signal to obtain a detection result, the detection result including a sounding signal corresponding to the reference signal sent by the transmitting station that matches the reference signal obtained by the receiving station;

[0092] Based on the detection results, signal acquisition time and signal reception time, the time difference positioning information of the target to be detected is obtained.

[0093] The method receives a radio signal sent by a target satellite and performs preset signal processing on the radio signal to obtain reference signals of a receiving station and a sending station; the sending station broadcasts and sends the reference signal; the receiving station obtains the time difference positioning information of the target to be measured based on the reference signal and at least one detection signal reflected by the received target to be measured. It can be seen that compared with the prior art, by replacing the reference signal received from the transmitting station in the prior art with the reference signal received by the receiving station, there is no need to consider the reception restriction of the reference signal due to the curvature of the earth, and by obtaining the same reference signal, the consistency of the reference signal is guaranteed, thereby improving the accuracy of target tracking.

[0094] Corresponding to the above method, an embodiment of the present invention further provides a target positioning device, such as Figure 5 As shown, the target positioning device includes: a receiving unit 510, an acquiring unit 520 and a broadcasting unit 530;

[0095] A receiving unit 510, configured to receive a radio signal sent by a target satellite;

[0096] An acquisition unit 520 is used to perform preset signal processing on the radio signal to acquire a reference signal;

[0097] A broadcast unit 530, configured to broadcast a reference signal;

[0098] The acquisition unit 520 is further configured to acquire the time difference positioning information of the target to be measured based on the reference signal and at least one detection signal reflected by the received target to be measured.

[0099] In an optional implementation, the acquisition unit 520 is specifically configured to:

[0100] Acquiring a synchronization signal based on a preset synchronization clock control signal and a radio signal;

[0101] A preset modulation mechanism is adopted to perform signal modulation on the synchronization signal to obtain a reference signal.

[0102] In an optional implementation, the apparatus further includes a recording unit 540;

[0103] The recording unit 540 is used to record the signal reception time of the reference signal and the signal reception time of at least one detection signal.

[0104] In an optional implementation, the acquisition unit 520 is specifically configured to:

[0105] Performing coherent detection on the reference signal and at least one detection signal to obtain a detection result, wherein the detection result includes a detection signal corresponding to a second reference signal matching the first reference signal;

[0106] Based on the detection results and signal reception time, the time difference positioning information of the target to be detected is obtained.

[0107] In an optional implementation, the target time difference positioning information includes a time delay difference between a first reference signal and at least one detection signal.

[0108] The functions of the functional units of the target positioning device provided by the above embodiments of the present invention can be implemented by the above method steps. Therefore, the specific working process and beneficial effects of each unit in the target positioning device provided by the embodiment of the present invention are not repeated here.

[0109] The embodiment of the present invention further provides an electronic device, such as Figure 6 As shown, it includes a processor 610 , a communication interface 620 , a memory 630 and a communication bus 640 , wherein the processor 610 , the communication interface 620 , and the memory 630 communicate with each other via the communication bus 640 .

[0110] Memory 630, for storing computer programs;

[0111] The processor 610 is used to implement the following steps when executing the program stored in the memory 630:

[0112] Receive radio signals sent by target satellites;

[0113] Performing preset signal processing on the radio signal to obtain a reference signal;

[0114] Broadcasting a reference signal;

[0115] Based on the reference signal and at least one detection signal received and reflected by the target to be detected, the time difference positioning information of the target to be detected is obtained.

[0116] In an optional implementation, performing preset signal processing on the radio signal to obtain a reference signal includes:

[0117] Acquiring a synchronization signal based on a preset synchronization clock control signal and a radio signal;

[0118] A preset modulation mechanism is adopted to perform signal modulation on the synchronization signal to obtain a reference signal.

[0119] In an optional implementation, the signal reception time of the reference signal and the signal reception time of at least one detection signal are recorded.

[0120] In an optional implementation, acquiring time difference positioning information of the target to be measured based on the reference signal and at least one detection signal reflected by the received target to be measured includes:

[0121] Performing coherent detection on the reference signal and at least one detection signal to obtain a detection result, wherein the detection result includes a detection signal corresponding to a second reference signal matching the first reference signal;

[0122] Based on the detection results and signal reception time, the time difference positioning information of the target to be detected is obtained.

[0123] In an optional implementation, the target time difference positioning information includes a time delay difference between a first reference signal and at least one detection signal.

[0124] The communication bus mentioned above can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The communication bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, only one thick line is used in the figure, but it does not mean that there is only one bus or one type of bus.

[0125] The communication interface is used for communication between the above electronic device and other devices.

[0126] The memory may include a random access memory (RAM) or a non-volatile memory (NVM), such as at least one disk memory. Optionally, the memory may also be at least one storage device located away from the aforementioned processor.

[0127] The above-mentioned processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0128] The implementation methods and beneficial effects of the components of the electronic device in the above embodiments to solve the problems can be seen in Figure 4 The various steps in the illustrated embodiment are implemented, therefore, the specific working process and beneficial effects of the electronic device provided by the embodiment of the present invention are not repeated here.

[0129] In another embodiment of the present invention, a computer-readable storage medium is provided. The computer-readable storage medium stores instructions. When the instructions are executed on a computer, the computer executes the target positioning method described in any one of the above embodiments.

[0130] In another embodiment of the present invention, a computer program product including instructions is provided. When the computer program product is executed on a computer, the computer executes the target positioning method described in any one of the above embodiments.

[0131] Those skilled in the art will appreciate that the embodiments in the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt a complete hardware embodiment, a complete software embodiment, or a form of an embodiment combining software and hardware. Moreover, the present application may adopt a form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0132] The embodiments of the present application are described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0133] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0134] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0135] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the embodiments of the present application.

[0136] Obviously, those skilled in the art can make various changes and modifications to the embodiments in the present application without departing from the spirit and scope of the embodiments in the present application. Thus, if these modifications and variations of the embodiments in the present application fall within the scope of the claims and their equivalents in the embodiments of the present application, the embodiments of the present application are also intended to include these modifications and variations.

Claims

1. A passive radar system based on target positioning, characterized in that: The system comprises: a transmitting station, a receiving station and a radar monitoring center; The transmitting station is used to receive a radio signal sent by a target satellite; perform preset signal processing on the radio signal to obtain a second reference signal; and broadcast the second reference signal; The receiving station is used to receive the radio signal sent by the target satellite; perform the preset signal processing on the radio signal to obtain a first reference signal, wherein the first reference signal and the second reference signal are signals with the same frequency spectrum, and the signal acquisition time of the first reference signal is the same as the signal acquisition time of the second reference signal; receiving at least one detection signal reflected by the target to be measured, wherein the detection signal is a signal obtained by the target to be measured reflecting the second reference signal; The radar monitoring center is used to obtain the time difference positioning information of the target to be measured based on the first reference signal and the at least one detection signal; the time difference positioning information of the target to be measured includes the time delay difference between the first reference signal and the at least one detection signal; The transmitting station includes a first receiving device and a transmitting device connected to the first receiving device, and each receiving station includes the first receiving device and at least one second receiving device; The first receiving device of the transmitting station is used to receive the radio signal sent by the target satellite; perform preset signal processing on the radio signal to obtain a second reference signal; The sending device is used to broadcast and send the second reference signal; The first receiving device of the receiving station is used to receive the radio signal sent by the target satellite; perform the preset signal processing on the radio signal to obtain a first reference signal; The second receiving device is used to receive the detection signal reflected by the target to be detected.

2. The system according to claim 1, characterized in that The first receiving device comprises: a satellite receiving unit, a GPS clock unit, a synchronization adaptation unit and a modulation unit; The satellite receiving unit is used to receive the radio signal sent by the target satellite; The GPS clock unit is used to output a preset synchronization clock control signal to the synchronization adaptation unit; The synchronization adaptation unit is used to obtain a synchronization signal based on the preset synchronization clock control signal and the radio signal; The modulation unit is used to adopt a preset modulation mechanism to perform signal modulation on the synchronization signal to obtain a reference signal.

3. The system according to claim 1, characterized in that The system also includes a storage device; The storage device is used to record the signal acquisition time of the first reference signal and the signal reception time of the at least one detection signal.

4. The system according to claim 3, characterized in that The radar monitoring center is specifically configured to perform coherent detection on the first reference signal and the at least one detection signal to obtain a detection result, wherein the detection result includes a detection signal corresponding to the second reference signal that matches the first reference signal; Based on the detection result, the signal acquisition time and the signal reception time, the time difference positioning information of the target to be detected is obtained.

5. A target positioning method, applied to the passive radar system based on target positioning as claimed in claim 1, characterized in that: The method comprises: Receive radio signals sent by target satellites; Performing preset signal processing on the radio signal to obtain a reference signal; Broadcasting and sending the reference signal; Based on the reference signal and at least one detection signal reflected by the received target to be measured, the time difference positioning information of the target to be measured is obtained.

6. The method according to claim 5, characterized in that Performing preset signal processing on the radio signal to obtain a reference signal includes: Acquire a synchronization signal based on a preset synchronization clock control signal and the radio signal; A preset modulation mechanism is adopted to perform signal modulation on the synchronization signal to obtain a reference signal.

7. The method according to claim 5, characterized in that Before acquiring the time difference positioning information of the target to be measured, the method further includes: The signal acquisition time of the reference signal and the signal reception time of the at least one detection signal are recorded.

8. The method according to claim 7, characterized in that Acquiring time difference positioning information of the target to be measured based on the reference signal and at least one detection signal reflected by the target to be measured, including: Performing coherent detection on the reference signal and the at least one detection signal to obtain a detection result, wherein the detection result includes a detection signal corresponding to the second reference signal that matches the first reference signal; Based on the detection result, the signal acquisition time and the signal reception time, the time difference positioning information of the target to be detected is obtained.

9. The method according to any one of claims 5 to 8, characterized in that: The time difference positioning information of the target to be detected includes the time delay difference between the first reference signal and the at least one detection signal.

10. An electronic device, characterized in that: The electronic device comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus; Memory, used to store computer programs; A processor is used to implement the method steps described in any one of claims 5-9 when executing a program stored in a memory.

11. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method steps described in any one of claims 5 to 9 are implemented.

Images