Radar scene simulation method, system and device for recorder

Abstract

The present invention discloses a radar scene simulation method, system and device for a recorder, belonging to the field of radar technology, the method comprising obtaining a real-record environment echo played back by the recorder, and extracting carrier inertial navigation data, current beam B code time and beam pointing parameters from the real-record environment echo; generating target scene data through interpolation filtering according to the carrier inertial navigation data, current beam B code time and scene simulation parameters, the target scene data comprising target information and interference information; based on the target scene data and the current beam B code time, filtering the target scene data into target simulation control parameters through interpolation filtering; based on the target simulation control parameters, generating a target simulation echo and a corresponding interference beam; superimposing the target simulation echo and the interference beam on the real-record environment echo to obtain a synthetic echo signal. Compared with the traditional offline simulation based on real-record clutter, the present invention has the advantages of fast and flexible real-time performance, and greatly shortens the processing time.

Description

Technical Field

[0001] The present invention relates to the field of radar technology, and in particular to a radar scene simulation method, system and device for a recorder. Background Art

[0002] Due to the downward-looking method, airborne radars include airborne early warning radars, airborne fire control radars, and airborne measurement radars, and their performance is closely related to ground clutter. Strong clutter will not only reduce radar detection performance, but also lead to a large distance and speed blind spot, thus causing target loss. Clutter has become a key factor in radar detection and tracking performance. Through technologies such as repetition frequency optimization and waveform design, the distance and speed blind spot of airborne radars can be effectively reduced, but most optimizations are based on theoretical model calculations or simulated clutter. The airborne radar echo is a superposition of a large number of surface clutter, which is complex, diverse, and time-varying, and it is difficult to model and simulate with a high degree of fit. Using test flights to obtain real echoes has practical difficulties such as high cost and long time. Therefore, it is necessary to improve the utilization rate of the hard-won actual ground object recorded echoes.

[0003] Large-capacity recorders can record radar echo data for a long time, which reduces the cost of obtaining radar echoes and effectively reduces the number of flights. At the same time, the radar adopts a parametric design, which greatly enriches the diversity of radar echoes by loading a variety of pre-arranged waveform parameters or adjusting parameters online in real time. Through a limited number of flight tests, radar ground object echoes with different waveforms can be fully obtained, but the diversity of test targets is difficult to meet: in a limited number of flights, there are test target types and a single flight track, which cannot represent all target types.

[0004] In the related technology, a Chinese invention application with application publication number CN107765226A discloses a SAR radar echo simulation method, system and medium, which determines the current antenna pointing of the satellite according to the attitude information transmitted by the satellite in real time; interpolates and infers the current position of the satellite by looking up the PVT table to obtain the position, velocity and acceleration information of the satellite; calculates the distance between the satellite and the simulated target on the ground and the gain of the current target echo; establishes a mathematical model of the echo signal of the satellite-borne SAR point target; generates the echo signal of the satellite-borne SAR scene by superimposing the target echo models of multiple points, and finally obtains the SAR satellite echo signal data, thereby improving the authenticity of the SAR echo simulation. The method of forming a SAR scene by superimposing multiple point targets can generate scenes of different styles more quickly.

[0005] However, the SAR radar echo simulation method is to accurately obtain the satellite position and attitude in real time to complete the parameter confirmation of the echo model. The method mainly adopts table lookup and time accurate acquisition, and generates the final echo by superimposing the echo signals of multiple point targets. The key is to solve the simulation error caused by the inaccurate motion state of the SAR satellite on orbit. In addition, this method cannot be used for airborne radar, especially realistic airborne radar echo simulation, which only superimposes limited point target echoes and cannot represent the superposition of vast ground objects. Summary of the invention

[0006] The technical problem to be solved by the present invention is how to quickly and in real time realize offline scene simulation based on recorded clutter.

[0007] The present invention solves the above technical problems through the following technical means:

[0008] The present invention proposes a radar scene simulation method for a recorder, the method comprising:

[0009] Acquire the recorded environment echo played back by the recorder, and extract the carrier inertial navigation data, current beam B code time and beam pointing parameters from the recorded environment echo;

[0010] Generate target scene data through interpolation filtering according to the carrier inertial navigation data, the current beam B code time and scene simulation parameters, wherein the target scene data includes target information and interference information;

[0011] Based on the target scene data and the current beam B code time, the target scene data is filtered and converted into target simulation control parameters through interpolation filtering;

[0012] Based on the target simulation control parameters, generating a target simulation echo and a corresponding interference beam;

[0013] The target simulated echo and the interference beam are superimposed on the recorded environment echo to obtain a synthetic echo signal.

[0014] The present invention adds scene targets based on recorded echoes, and compared with the traditional clutter modeling simulation method, the background environment is more realistic and reliable. Compared with the traditional offline simulation based on recorded clutter, it has the advantages of fast and flexible real-time performance, greatly shortening the processing time.

[0015] Furthermore, the generating target scene data through interpolation filtering according to the carrier inertial navigation data, the current beam B code time and the scene simulation parameters includes:

[0016] Setting scene simulation parameters, wherein the scene simulation parameters include target motion trajectory, target Swerling type, target RCS value and interference information;

[0017] Based on the carrier inertial navigation data, the current beam B code time and the scene simulation parameters, multiple data frames containing the target scene at a future moment are updated in real time as the target scene data.

[0018] Further, based on the target scene data and the current beam B code time, filtering the target scene data into target simulation control parameters through interpolation filtering includes:

[0019] According to the target scene data and the current beam B code time, the position, angle and speed of the target at the current beam moment are obtained through interpolation filtering;

[0020] Calculate the target signal amplitude in the beam according to the amplitude ratio angle measurement curve;

[0021] The position, angle and speed of the target and the target signal amplitude in the beam are used as the target simulation control parameters.

[0022] In addition, the present invention also proposes a radar scene simulation system for a recorder, the system comprising:

[0023] An acquisition module is used to acquire the recorded environment echo played back by the recorder, and extract the carrier inertial navigation data, the current beam B code time and the beam pointing parameter from the recorded environment echo;

[0024] A target scene data generation module, used to generate target scene data through interpolation filtering according to the carrier inertial navigation data, the current beam B code time and scene simulation parameters, wherein the target scene data includes target information and interference information;

[0025] A conversion module, configured to convert the target scene data into target simulation control parameters through interpolation filtering based on the target scene data and the current beam B code time;

[0026] An echo generation module, used for generating a target simulation echo and a corresponding interference beam based on the target simulation control parameter;

[0027] The echo synthesis module is used to superimpose the target simulated echo and the interference beam onto the recorded environment echo to obtain a synthesized echo signal.

[0028] Furthermore, the target scene data generation module includes:

[0029] A setting unit, used to set scene simulation parameters, wherein the scene simulation parameters include target motion trajectory, target Swerling type, target RCS value and interference information;

[0030] The target scene data generating unit is used to update multiple data frames containing target scenes at future moments in real time based on the carrier inertial navigation data, the current beam B code time and the scene simulation parameters as the target scene data.

[0031] Furthermore, the conversion module includes:

[0032] A filtering unit, configured to obtain the position, angle and speed of the target at the current beam moment through interpolation filtering according to the target scene data and the current beam B code time;

[0033] An amplitude calculation unit calculates the amplitude of the target signal in the beam according to the amplitude ratio angle measurement curve;

[0034] The target simulation control parameter generating unit is used to take the position, angle and speed of the target and the amplitude of the target signal in the beam as the target simulation control parameters.

[0035] In addition, the present invention also proposes a radar scene simulation device for a recorder, the device comprising: a recorder, a scene simulation computer and a signal processing extension, the signal processing extension comprising a digital signal processing board and a data interface board;

[0036] The recorder and the scene simulation computer are connected via a network for two-way communication, the recorder and the data interface board are connected via an optical fiber, the scene simulation computer and the data interface board are connected via a network for two-way communication, and the digital signal processing board and the data interface board are connected via an SRIO interface;

[0037] The recorder is used to play back the recorded environmental echo;

[0038] The data interface board is used to receive the real recorded environment echo played back by the recorder via optical fiber, and distribute it to the digital signal processing board through the SRIO interface; and is used to convert the target scene data sent by the scene simulation computer into target simulation control parameters;

[0039] The digital signal processing board is used to extract the carrier inertial navigation data, the current beam B code time and the beam pointing parameters from the recorded environment echo, and forward the extracted data to the scene simulation computer via the data interface board; and is used to generate the target simulation echo and the corresponding interference beam according to the target simulation control parameters sent by the data interface board, and superimpose the target simulation echo and the interference beam on the recorded environment echo; and complete the pulse compression, PD filtering, CFAR detection and other radar signal processing functions of the synthesized echo;

[0040] The scenario simulation computer is used to set DSP processing parameters and scenario simulation parameters, and generates target scenario data according to the carrier inertial navigation data, the current beam B code time and scenario simulation parameters, and sends the target scenario data to the data interface board.

[0041] Furthermore, the data interface board includes a PowerPC chip and an FPGA chip, the PowerPC chip and the scene simulation computer are connected via a network for two-way communication, and the PowerPC chip and the digital signal processing board are connected via an SRIO interface for two-way communication;

[0042] The input end of the FPGA chip is connected to the output end of the recorder via an optical fiber, and the output end of the FPGA chip is connected to the input end of the digital signal processing board via an SRIO interface. High-speed access and distribution of data are mainly completed in the FPGA chip.

[0043] Further, the FPGA chip is used to forward the real recorded environment echo played back by the recorder to the digital signal processing board, so that the digital signal processing board extracts data from the real recorded environment echo;

[0044] The PowerPC chip is used to receive the data extracted from the recorded environment echo by the digital signal processing board and forward it to the scene simulation computer, and to receive the target scene data sent by the scene simulation computer, and convert the target scene data into target simulation control parameters and send them to the digital signal processing board.

[0045] Further, the target scene data includes: current beam B code time, number of valid targets, jammer motion information, target motion information, target Swerling type, target RCS value and interference information;

[0046] The target simulation control parameters include: working mode, wave sequence number, effective target quantity, target radial distance, target radial speed, target signal amplitude in each beam, interference quantity and interference information.

[0047] The advantages of the present invention are:

[0048] (1) The present invention adds scene targets based on recorded echoes. Compared with the traditional clutter modeling and simulation method, the background environment is more realistic and reliable, and realistic airborne radar echo simulation can be achieved. In addition, although network communication is continuously iterated, it is not real-time. The present invention adopts respective interpolation filtering to achieve real-time simulation. At the same time, interpolation filtering also solves the contradiction between the uniform moment of the scene and the real-time moment of the data in the digital signal processing board.

[0049] (2) The PowerPC chip has powerful computing power, so after the digital signal processing board sends the inertial navigation and B code information, it responds very quickly, in the order of tens of microseconds, while the digital signal processing board performs full-process processing in 40-60 milliseconds. Therefore, the PowerPC interaction inserted in the normal signal processing process does not affect the real-time performance of the entire process. Based on the powerful computing and fast response capabilities of the PowerPC chip, the high-speed SRIO communication with the digital signal processing board, and the parallel independent interpolation filtering between the PowerPC chip and the scene simulation computer, the target simulation control parameter generation and writing time is in the order of hundreds of microseconds, which is less than 5% of the full-process signal processing. Therefore, it does not affect the subsequent signal processing, ensuring the real-time performance of the system. Compared with the traditional offline simulation based on real-time clutter, it has the real-time advantages of fast modeling and flexible parameter setting, which greatly improves the simulation efficiency.

[0050] (3) By constructing an architecture for adding scene targets based on recorded echoes, the configuration characteristics of the corresponding implementation device are clarified, which can be used for radar systems with similar configurations, as well as for target detection performance evaluation and radar waveform and signal processing parameter setting optimization in typical environments of airborne early warning radars and measurement radars, as well as carrier route planning of measurement radars in range tests.

[0051] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 is a flow chart of a radar scene simulation method for a recorder in a first embodiment of the present invention;

[0053] Figure 2 is a schematic structural diagram of a radar scene simulation system for a recorder in a second embodiment of the present invention;

[0054] Figure 3 is a structural diagram of a radar scene simulation device for a recorder in a third embodiment of the present invention;

[0055] Figure 4 It is a flow chart of the scene simulation method based on recorded echo in the present invention;

[0056] Figure 5 It is a schematic diagram of the signal processing extension plug-in composition of the present invention;

[0057] Figure 6 It is a principle block diagram of the signal processing extension plug-in in the present invention;

[0058] Figure 7 It is a principle block diagram of the data interface board in the present invention. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] like Figure 1 As shown, the first embodiment of the present invention proposes a radar scene simulation method for a recorder, and the method includes the following steps:

[0061] S10, obtaining the recorded environment echo played back by the recorder, and extracting the carrier inertial navigation data, the current beam B code time and the beam pointing parameter from the recorded environment echo;

[0062] S20, generating target scene data through interpolation filtering according to the carrier inertial navigation data, the current beam B code time and scene simulation parameters, wherein the target scene data includes target information and interference information;

[0063] S30, based on the target scene data and the current beam B code time, converting the target scene data into target simulation control parameters through interpolation filtering;

[0064] S40, generating a target simulation echo and a corresponding interference beam based on the target simulation control parameter;

[0065] S50, superimposing the target simulated echo and the interference beam onto the recorded environment echo to obtain a synthetic echo signal.

[0066] This embodiment adds scene targets based on recorded echoes. Compared with the traditional clutter modeling and simulation method, the background environment is more realistic and reliable, and realistic airborne radar echo simulation can be achieved. In addition, although network communication is continuously iterated, it is not real-time. This embodiment uses respective interpolation filtering to achieve real-time simulation. At the same time, interpolation filtering also solves the contradiction between the uniform moment of the scene and the real-time moment of the data in the digital signal processing board. Compared with the traditional offline simulation based on recorded clutter, it has the advantages of fast and flexible real-time performance, greatly shortening the processing time.

[0067] In one embodiment, the step S20 includes the following steps:

[0068] Setting scene simulation parameters, wherein the scene simulation parameters include target motion trajectory, target Swerling type, target RCS value and interference information;

[0069] Based on the carrier inertial navigation data, the current beam B code time and the scene simulation parameters, multiple data frames containing target scene data at future moments are updated in real time as the target scene data.

[0070] It should be noted that the target scene data generated in this embodiment is a target scene at a future moment predicted based on historical data, generally includes 3-5 frames of data, and is a rolling update.

[0071] In one embodiment, the step S30 includes the following steps:

[0072] According to the target scene data and the current beam B code time, the position, angle and speed of the target at the current beam moment are obtained through interpolation filtering;

[0073] Calculate the target signal amplitude in the beam according to the amplitude ratio angle measurement curve;

[0074] The position, angle and speed of the target and the target signal amplitude in the beam are used as the target simulation control parameters.

[0075] In addition, if Figure 2 As shown, the second embodiment of the present invention proposes a radar scene simulation system for a recorder, characterized in that the system includes:

[0076] An acquisition module 10 is used to acquire the recorded environment echo played back by the recorder, and extract the carrier inertial navigation data, the current beam B code time and the beam pointing parameter from the recorded environment echo;

[0077] A target scene data generating module 20 is used to update and generate multiple data frames containing target scene data at future moments according to the carrier inertial navigation data, the current beam B code time and the scene simulation parameters, wherein the target scene data includes target information and interference information;

[0078] A conversion module 30, configured to filter and convert the target scene data into target simulation control parameters based on the target scene data and the current beam B code time;

[0079] An echo generation module 40, configured to generate a target simulation echo and a corresponding interference beam based on the target simulation control parameter;

[0080] The echo synthesis module 50 is used to superimpose the target simulated echo and the interference beam onto the recorded environment echo to obtain a synthesized echo signal.

[0081] In one embodiment, the target scene data generation module includes:

[0082] A setting unit, used to set scene simulation parameters, wherein the scene simulation parameters include target motion trajectory, target Swerling type, target RCS value and interference information;

[0083] The target scene data generating unit is used to update multiple data frames containing target scenes at future moments in real time based on the carrier inertial navigation data, the current beam B code time and the scene simulation parameters as the target scene data.

[0084] In one embodiment, the conversion module includes:

[0085] A filtering unit, configured to obtain the position, angle and speed of the target at the current beam moment through interpolation filtering according to the target scene data and the current beam B code time;

[0086] An amplitude calculation unit calculates the amplitude of the target signal in the beam according to the amplitude ratio angle measurement curve;

[0087] The target simulation control parameter generating unit is used to take the position, angle and speed of the target and the amplitude of the target signal in the beam as the target simulation control parameters.

[0088] It should be noted that other embodiments or implementation methods of the radar scene simulation system for recorders described in the present invention can refer to the above-mentioned method embodiments, which will not be repeated here.

[0089] In addition, if Figure 3 to Figure 4 As shown, the third embodiment of the present invention proposes a radar scene simulation device for a recorder, the device comprising: a recorder 1, a scene simulation computer 2 and a signal processing extension 3, the signal processing extension 3 comprising a digital signal processing board 32 and a data interface board 31;

[0090] The recorder 1 and the scene simulation computer 2 are connected via a network for two-way communication, the recorder 1 and the data interface board 31 are connected via an optical fiber, the scene simulation computer 2 and the data interface board 31 are connected via a network for two-way communication, and the digital signal processing board 32 and the data interface board 31 are connected via an SRIO interface;

[0091] The recorder 1 is used to play back the recorded environmental echo;

[0092] The data interface board 31 is used to receive the real recorded environment echo played back by the recorder 1 via optical fiber, and distribute it to the digital signal processing board 32 through the SRIO interface; and is used to convert the target scene data sent by the scene simulation computer 2 into target simulation control parameters;

[0093] The digital signal processing board 32 is used to extract the carrier inertial navigation data, the current beam B code time and the beam pointing parameters from the recorded environment echo, and forward the extracted data to the scene simulation computer 2 via the data interface board 31; and is used to generate a target simulation echo and a corresponding interference beam according to the target simulation control parameters sent by the data interface board 31, and superimpose the target simulation echo and the interference beam on the recorded environment echo, and complete the radar signal processing;

[0094] The scenario simulation computer 2 is used to set DSP processing parameters and scenario simulation parameters, and generates target scenario data according to the carrier inertial navigation data, the current beam B code time and scenario simulation parameters, and sends the target scenario data to the data interface board 31 .

[0095] Specifically, Figures 5 to 7 The recorder 1 is used for recording and replaying the environmental echo.

[0096] The data interface board 31 is used for environmental echo distribution and target echo simulation control.

[0097] The data interface board 31 is used to receive the recorded echo from the recorder 1 through optical fiber and distribute it to an idle digital signal processing board through SRIO (Serial Rapid I / O, also known as RapidIO), forward the carrier inertial navigation data parsed from the echo data by the digital signal processing board to the scene simulation computer 2 to generate subsequent scene data, and filter and convert the scene data generated by the scene computer into target simulation control parameters required by the digital signal processing board.

[0098] When adjusting the parameters of the digital signal processing board, the data interface board 31 distributes the DSP processing parameters sent by the scene computer to all digital signal processing boards through the SRIO interface in a single action.

[0099] The data interface board 31, for the target scene sent from the scene simulation computer 2 and the current beam B code time sent from the digital signal processing board, performs interpolation filtering in the PowerPC chip to obtain the position, angle, speed, etc. of the target and carrier corresponding to the current beam, and then calculates the amplitude of the sum, difference, difference and shadow beams based on the amplitude ratio angle measurement curve, and sends it to all digital signal processing boards through the SRIO interface.

[0100] The scene simulation computer 2 uses an X86 architecture CPU, which has the characteristics of good versatility. It sends the target scene to the PowerPC chip in the data interface board 31 through the network, and the sending frequency is uniformly 20 Hz.

[0101] The scenario simulation computer 2 receives the carrier inertial navigation, B code and beam pointing parameters of the PowerPC chip in the interface board through the network. The data is non-time uniform and is smoothed by interpolation filtering.

[0102] The scene simulation computer 2 (usually combined with the radar display and control computer) is used to generate matching carrier predictions and target position, attitude, and speed data based on the current time and carrier inertial navigation data in the echo data.

[0103] After receiving the echo data distributed by the data interface board 31, the digital signal processing board 32 first parses the inertial navigation, B code and other information, packages them and sends them to the PowerPC chip in the data interface board 31 through SRIO, and then performs subsequent target simulation echo generation, pulse pressure, PD filtering and other processing after it returns the corresponding target simulation control parameters.

[0104] It should be noted that the digital signal processing board 32 in this embodiment includes multiple DSP chips. The specific model of the DSP chip may be TMS320C6678. There are dozens of DSP chips for processing real-time IQ data in turn. For example, there are 40 DSP chips used in this embodiment.

[0105] This embodiment adds scene targets based on recorded echoes, and compared with the traditional clutter modeling simulation method, the background environment is more realistic and reliable. Compared with the traditional offline simulation based on recorded clutter, it has the advantages of fast and flexible real-time performance, greatly shortening the processing time.

[0106] In one embodiment, if Figure 7 As shown, the data interface board 31 includes a PowerPC chip and an FPGA chip, the PowerPC chip and the scene simulation computer 2 are connected via a network for two-way communication, and the PowerPC chip and the digital signal processing board are connected via an SRIO interface for two-way communication;

[0107] The input end of the FPGA chip is connected to the output end of the recorder 1 via an optical fiber, and the output end of the FPGA chip is connected to the input end of the digital signal processing board via an SRIO interface.

[0108] Specifically, the FPGA chip is used to forward the real-recording environment echo played back by the recorder 1 to the digital signal processing board;

[0109] The PowerPC chip is used to forward the data extracted by the digital signal processing board from the recorded environment echo to the scene simulation computer 2, and to receive the target scene data sent by the scene simulation computer 2, and convert the target scene data into target simulation control parameters and send them to the digital signal processing board.

[0110] It should be noted that the data interface board 31 adopts the PowerPC+FPGA architecture. The FPGA chip is responsible for the real-time playback of large-capacity recorded beam data. The multi-core PowerPC chip is responsible for network interaction, scene filtering, and the calculation and forwarding of various DSP parameters required. It also receives inertial navigation data extracted from the echo data sent back by dozens of DSP chips. It is equipped with RapidIO, a high-speed transmission method, and 1GB of DDR3, which is suitable for high-speed, real-time calculation and transmission. It is the basis for ensuring the real-time operation of the entire system. It should be noted that the real-time playback speed of echo data is above 3GB / s, and the interaction frequency of echo data between the top-level scene and the bottom-level real-time playback is as high as 20Hz.

[0111] In one embodiment, the target scene data includes: current beam B code time, number of valid targets, jammer motion information, target motion information, target Swerling type, target RCS value and interference information;

[0112] The target simulation control parameters include: working mode, wave sequence number, effective target quantity, target radial distance, target radial speed, target signal amplitude in each beam, interference quantity and interference information.

[0113] like Figure 4 As shown, the implementation steps of this device are as follows:

[0114] (1) Simulation initialization: In the radar display and control, switch the mode to the recorder 1 model mode. In the scene simulation interface, click Initialize to switch to the recorder 1 control interface. Starting from the specified time point, replay the data with a duration of 1-60 seconds. This step is mainly to obtain the carrier motion trajectory as a reference for the operator to plan the target trajectory and to obtain the start of the simulation recursion. The duration depends on the situation. After becoming familiar with the carrier route, the duration can be shortened to 1 second or even shorter (the initial moment needs to be obtained from the data). When the recorded data is played back to the digital signal processing board 32, the digital signal processing board 32 will extract and package the carrier inertial navigation, time, and beam pointing data in the data and send it to the PowerPC chip on the data interface board 31 through the SRIO interface. The PowerPC chip processes the package and transmits it back to the scene simulation computer 2 through the gigabit network. In the initialization stage, the digital signal processing board 32 only transmits data back and does not perform subsequent processing. The information contained in the transmitted data is shown in Table 1:

[0115] Table 1 DSP chip feedback information

[0116] Serial number name Number of bytes 1 Message Header 24 2 Wave number 4 3 time 8 4 Aircraft Inertial Navigation 12 5 Beam pointing (40 beams) 320

[0117] In the scene simulation interface, plan the target trajectory, set the target Swerling type, RCS size, and set the interference options, including the interference type, jammer route, etc. Click Save and Send. The specific information is shown in Table 2:

[0118] Table 2 Scenario simulation delivery parameters

[0119]

[0120] (2) Switch to scene simulation control, click Start, and then operate recorder 1 to restart playback from the specified time.

[0121] The data interface board 31 is connected to the recorder 1, and will distribute the echo data of the recorder 1 to the idle priority DSP chip according to the idle status of the DSP chip. The DSP chip that processes the first pulse group sends the inertial navigation, B code time and beam pointing in the echo data to the PowerPC chip in the data interface board 31 through the SRIO interface. The latter forwards it to the scene simulation computer 2 through the Gigabit network. The information format is the same as in the initialization step.

[0122] The scene simulation computer 2 updates 3-5 frames of scene information including the target and interference tracks in real time according to the target track planned by the operator and the time sent back by the current PowerPC chip, and returns it to the PowerPC chip through the Gigabit network. The information updated by the scene simulation computer 2 is a scene description with a uniform interval of 50ms.

[0123] The PowerPC chip obtains the target scene simulation control parameters as shown in Table 3 based on the scene information and the current beam B code time sent from the scene simulation computer 2. Specifically, the position, angle, and speed of the target at the current beam moment are obtained by interpolation filtering, and then the amplitude and size of the beams such as the sum, difference, and shadow are calculated according to the amplitude measurement curve, and sent to all DSP chips through the SRIO interface. In the simulation state, the DSP chip will not process the echo data immediately after receiving it, and it needs to wait for the PowerPC chip to write the control parameters before subsequent processing.

[0124] Table 3 Parameters of DSP sent by PowerPC chip

[0125]

[0126]

[0127] The DSP chip generates the corresponding target echo according to the beam amplitude, target position and speed sent by the PowerPC chip. According to the interference information, the DSP chip generates the corresponding noise / interference target beam and superimposes it with the ground object echo played back by recorder 1. The synthesized echo undergoes subsequent pulse compression, pulse Doppler, constant false alarm detection (CFAR) and other processing in the DSP chip. The processing results are sent for point trace processing, and then all subsequent radar data processing is completed and finally sent to the display control.

[0128] (3) Real-time simulation.

[0129] During the real-time simulation process, DSP processing parameters, such as CFAR method, CFAR threshold, filter weighted depth, etc., can be set on the display control and written to the PowerPC chip via the network for real-time changes.

[0130] Table 4 DSP configurable parameters

[0131] Serial number name Number of bytes 1 CFAR Method 24 2 CFAR Threshold 4 3 Distance and speed segment parameters 64 4 Is it invisible? 1 5 Shadow Threshold 2 6 Main clutter removal method 1 7 Pulse Doppler Weighted Depth 2

[0132] It should be noted that the real-time performance of the entire process is ensured through data interaction between the PowerPC chip and the DSP chip, and between the scene computer and the PowerPC chip.

[0133] Through testing, the time consumption of each link is shown in Table 5. In the actual system, the time of one wave position is between 50ms and 300ms, so the time consumption can meet the real-time processing requirements.

[0134] Table 5 Processing time

[0135]

[0136]

[0137] The radar scene simulation device provided in this embodiment makes full use of multiple types of ground echo data recorded in the test flight, uses a recorder for real-time playback, adds scene targets in the echo in real time, and adjusts some signal processing parameters to verify the target detection performance under the actual background. By setting different types of recorded echoes and different signal processing parameters, the radar parameter settings and aircraft routes are optimized. It can be used to assess the actual target detection and tracking performance in the typical environment of airborne early warning radars and measurement radars, thereby assisting in the optimization of radar waveforms, signal processing parameters, and the optimization of carrier aircraft routes during range measurements.

[0138] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0139] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0140] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0141] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0142] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A radar scene simulation method for a recorder, characterized in that: The method comprises: Acquire the recorded environment echo played back by the recorder, and extract the carrier inertial navigation data, current beam B code time and beam pointing parameters from the recorded environment echo; Generate target scene data through interpolation filtering according to the carrier inertial navigation data, the current beam B code time and scene simulation parameters, wherein the target scene data includes target information and interference information; Based on the target scene data and the current beam B code time, the target scene data is filtered and converted into target simulation control parameters through interpolation filtering; Based on the target simulation control parameters, generating a target simulation echo and a corresponding interference beam; The target simulated echo and the interference beam are superimposed on the recorded environment echo to obtain a synthetic echo signal.

2. The radar scene simulation method for a recorder as claimed in claim 1, characterized in that: The generating target scene data by interpolation filtering according to the carrier inertial navigation data, the current beam B code time and the scene simulation parameters comprises: Setting scene simulation parameters, wherein the scene simulation parameters include target motion trajectory, target Swerling type, target RCS value and interference information; Based on the carrier inertial navigation data, the current beam B code time and the scene simulation parameters, multiple data frames containing the target scene at a future moment are updated in real time as the target scene data.

3. The radar scene simulation method for a recorder as claimed in claim 1, characterized in that: The filtering and converting the target scene data into target simulation control parameters based on the target scene data and the current beam B code time through interpolation filtering includes: According to the target scene data and the current beam B code time, the position, angle and speed of the target at the current beam moment are obtained through interpolation filtering; Calculate the target signal amplitude in the beam according to the amplitude ratio angle measurement curve; The position, angle and speed of the target and the target signal amplitude in the beam are used as the target simulation control parameters.

4. A radar scene simulation system for a recorder, characterized in that: The system comprises: An acquisition module is used to acquire the recorded environment echo played back by the recorder, and extract the carrier inertial navigation data, the current beam B code time and the beam pointing parameter from the recorded environment echo; A target scene data generation module, used to generate target scene data at future moments of multiple data frames according to the carrier inertial navigation data, the current beam B code time and scene simulation parameters, wherein the target scene data includes target information and interference information; A conversion module, used for filtering and converting the target scene data into target simulation control parameters based on the target scene data and the current beam B code time; An echo generation module, used for generating a target simulation echo and a corresponding interference beam based on the target simulation control parameter; The echo synthesis module is used to superimpose the target simulated echo and the interference beam onto the recorded environment echo to obtain a synthesized echo signal.

5. The radar scene simulation system for recorders as claimed in claim 4, characterized in that: The target scene data generation module comprises: A setting unit, used to set scene simulation parameters, wherein the scene simulation parameters include target motion trajectory, target Swerling type, target RCS value and interference information; The target scene data generating unit is used to update multiple data frames containing target scenes at future moments in real time based on the carrier inertial navigation data, the current beam B code time and the scene simulation parameters as the target scene data.

6. The radar scene simulation system for recorders as claimed in claim 4, characterized in that: The conversion module comprises: A filtering unit, configured to obtain the position, angle and speed of the target at the current beam moment through interpolation filtering according to the target scene data and the current beam B code time; An amplitude calculation unit calculates the amplitude of the target signal in the beam according to the amplitude ratio angle measurement curve; The target simulation control parameter generating unit is used to take the position, angle and speed of the target and the amplitude of the target signal in the beam as the target simulation control parameters.

7. A radar scene simulation device for a recorder, characterized in that: The device comprises: a recorder, a scene simulation computer and a signal processing extension, wherein the signal processing extension comprises a digital signal processing board and a data interface board; The recorder and the scene simulation computer are connected via a network for two-way communication, the recorder and the data interface board are connected via an optical fiber, the scene simulation computer and the data interface board are connected via a network for two-way communication, and the digital signal processing board and the data interface board are connected via an SRIO interface; The recorder is used to play back the recorded environmental echo; The data interface board is used to receive the real recorded environment echo played back by the recorder via optical fiber, and distribute it to the digital signal processing board through the SRIO interface; and is used to convert the target scene data sent by the scene simulation computer into target simulation control parameters; The digital signal processing board is used to extract the carrier inertial navigation data, the current beam B code time and the beam pointing parameters from the recorded environment echo, and forward the extracted data to the scene simulation computer via the data interface board; and is used to generate the target simulation echo and the corresponding interference beam according to the target simulation control parameters sent by the data interface board, and superimpose the target simulation echo and the interference beam on the recorded environment echo, and complete the radar signal processing; The scenario simulation computer is used to set DSP processing parameters and scenario simulation parameters, and generates target scenario data according to the carrier inertial navigation data, the current beam B code time and scenario simulation parameters, and sends the target scenario data to the data interface board.

8. The radar scene simulation device for a recorder as claimed in claim 7, characterized in that: The data interface board includes a PowerPC chip and an FPGA chip, the PowerPC chip and the scene simulation computer are connected via a network for two-way communication, and the PowerPC chip and the digital signal processing board are connected via an SRIO interface for two-way communication; The input end of the FPGA chip is connected to the output end of the recorder via an optical fiber, and the output end of the FPGA chip is connected to the input end of the digital signal processing board via an SRIO interface.

9. The radar scene simulation device for a recorder as claimed in claim 8, characterized in that: The FPGA chip is used to forward the real recorded environment echo played back by the recorder to the digital signal processing board; The PowerPC chip is used to forward the data extracted by the digital signal processing board from the recorded environment echo to the scene simulation computer, and to receive the target scene data sent by the scene simulation computer, and convert the target scene data into target simulation control parameters and send them to the digital signal processing board.

10. The radar scene simulation device for a recorder as claimed in claim 7, characterized in that: The target scene data includes: current beam B code time, number of valid targets, jammer motion information, target motion information, target Swerling type, target RCS value and interference information; The target simulation control parameters include: working mode, wave sequence number, effective target quantity, target radial distance, target radial speed, target signal amplitude in each beam, interference quantity and interference information.

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