Simulation test system and method suitable for radiation type semi-physical radar

Abstract

The invention discloses a simulation test system and method suitable for a radiation type semi-physical radar. The system comprises a semi-physical radar; the three-axis turntable is configured to complete radar antenna motion attitude simulation; the scene visualization and simulation control computer is configured to complete scene planning, deduce a simulation process, distribute a scene situation and calculate target space data; the radar echo simulator is configured to perform time delay, Doppler frequency shift and amplitude modulation on a radar emission radio frequency signal through the FPGA and output a target echo simulation radio frequency signal; the antenna array and feed subsystem performs rough simulation and accurate simulation of a target position, converts a target echo radio frequency signal into an electromagnetic signal and radiates the electromagnetic signal to the space; the test evaluation computer is configured to calculate and display an evaluation index. According to the invention, a real radar is connected to a simulation closed loop, and a plurality of targets and movement thereof can be simulated for the radar according to scene driving, so that the semi-physical radar is fully simulated and tested.

Description

Technical Field

[0001] The invention belongs to the field of simulating target echo signals of a radiative semi-physical radar, and in particular relates to a simulation test system and method suitable for a radiative semi-physical radar. Background Art

[0002] Radiative semi-physical radar simulation and testing usually requires simulating the radar target's echo RF signal in the electromagnetic shielding environment of a microwave darkroom. In actual engineering applications, the simulation of the target echo RF signal of a radiative semi-physical radar generally sets up the radar antenna on a three-axis turntable, installs the antenna of the radar echo simulator at a certain distance in front of the three-axis turntable, and connects the radar excitation signal to the radar echo simulator. The radar echo simulator modulates the echo RF signal to simulate the target's distance and radial velocity, and the radar antenna's posture is simulated by rotating the turntable. However, this technical solution can only simulate a single target in a fixed direction each time, and cannot simulate the movement of the target according to the scene drive, nor can it simulate multiple targets and their movement at the same time, and thus cannot fully simulate and test the semi-physical radar.

[0003] Therefore, there is an urgent need for a complete simulation test system suitable for radiative semi-physical radar, which can connect the real radar into the simulation closed loop and simulate multiple targets and their movements for the radar according to the scenario drive, so as to provide a more realistic and systematic simulation test environment for the radar. Summary of the invention

[0004] The purpose of the present invention is to overcome the problems of the prior art and disclose a simulation test system and method suitable for a radiative semi-physical radar. The system and method of the present invention can simulate multiple targets and their relative motions for the radiative semi-physical radar at the same time through scene driving to solve the above-mentioned problems existing in the prior art.

[0005] On the one hand, the purpose of the present invention is achieved by the following technical solutions:

[0006] A simulation test system suitable for a radiation-type semi-physical radar, characterized in that the simulation test system comprises: a semi-physical radar, a three-axis turntable, a scene visualization and simulation control computer, a radar echo simulator, an antenna array and a feed subsystem, and a test evaluation computer.

[0007] The semi-physical radar transmits radio frequency signals, receives space electromagnetic signals, performs radar function processing, calculates targets and sends them via Ethernet;

[0008] The three-axis turntable provides a radar antenna mounting structure and is configured to receive scene situation data distributed by a scene visualization and simulation control computer and complete the simulation of the motion posture of the radar antenna;

[0009] The scene visualization and simulation control computer is configured to complete scene planning, deduce simulation processes, distribute scene situations, calculate target space data, and perform three-dimensional situation display;

[0010] The radar echo simulator is configured to perform time delay, Doppler frequency shift and amplitude modulation on the radar transmission radio frequency signal through FPGA and output a target echo simulation radio frequency signal;

[0011] The antenna array and feed subsystem performs rough and precise simulation of the target position by controlling the relative amplitude and phase difference compensation values ​​of the radio frequency switch matrix and the spherical array triplet, and converts the target echo radio frequency signal into an electromagnetic signal to radiate into space;

[0012] The test evaluation computer is configured to calculate and display evaluation indicators.

[0013] According to a preferred embodiment, the semi-physical radar comprises a radar integrated processing unit, a radar display and control unit, and a radar antenna.

[0014] The radar integrated processing unit is used to calculate and generate radar transmission radio frequency signals and send them to the radar antenna and radar echo simulator via radio frequency cables, receive the received radio frequency signals from the radar antenna to perform radar function processing, receive control instructions for radar display and control, and feed back instruction execution results and detection results, and send the detection results to the test evaluation computer;

[0015] The radar display and control is used to realize human-computer interaction of the radar, send control instructions to the radar integrated processing unit, receive and display the instruction execution results and detection results fed back by the radar integrated processing unit;

[0016] The radar antenna is installed on a three-axis turntable, receives the radar transmission radio frequency signal of the radar integrated processing unit through the radio frequency cable, converts it into an electromagnetic signal and radiates it into space, and receives the electromagnetic signal in space, converts it into a received radio frequency signal and sends it to the radar integrated processing unit.

[0017] According to a preferred embodiment, the simulation test system also includes a RF cable, which connects the RF transmission channel of the semi-physical radar integrated processing unit with the RF receiving channel of the radar echo simulator, and connects the various RF output channels of the radar echo simulator with the various RF input channels corresponding to the antenna array and the feed subsystem according to the correspondence between the target echo RF channels.

[0018] According to a preferred embodiment, the scene visualization and simulation control computer hardware is internally installed with scenario editing software, simulation guidance software, electromagnetic simulation calculation software, and three-dimensional situation software;

[0019] The scenario visualization and simulation control computer runs the scenario editing software to set the scenario scenario situation, target scattering characteristics, target echo RF channel correspondence and other test parameters according to the simulation test plan, and generate the scenario script file;

[0020] The scenario visualization and simulation control computer runs the simulation guidance software to load the scenario script file, deduce the simulation process, and distribute the scenario situation;

[0021] The scene visualization and simulation control computer runs the electromagnetic simulation software to receive the scene situation, calculate the relative distance and radial velocity data of each target and send them to the radar echo simulator, calculate the relative angle information of the target and send it to the antenna array and the feed subsystem;

[0022] The scene visualization and simulation control computer runs the three-dimensional situation software to receive the scene situation and display it based on the three-dimensional map.

[0023] According to a preferred embodiment, the radar echo simulator down-converts, samples and measures the frequency of the RF signal input through the RF cable, receives the relative distance and radial velocity of each target sent by the electromagnetic simulation calculation software, calculates the corresponding signal transmission delay and Doppler shift parameters, calculates the power attenuation parameters based on the target radial distance and target scattering characteristic parameters, and uses FPGA to perform delay, Doppler frequency shift and amplitude modulation on the sampled data according to the target in sequence. The modulated intermediate frequency signal is digitally up-converted and D / A converted to generate an RF signal, which is output to the RF input channel corresponding to the antenna array and the feed subsystem through the RF output channel corresponding to the target echo.

[0024] According to a preferred embodiment, the antenna array and feed subsystem comprises a spherical array of horn antennas, a position control unit, a radio frequency switch matrix, a programmable attenuator, a phase shifter and a power divider.

[0025] The power divider, phase shifter, programmable attenuator, RF matrix switch, and horn antenna are connected in sequence through RF cables to form several RF channels, which respectively receive each target echo RF signal output by the radar echo simulator, and then convert the RF signal into an electromagnetic signal through the horn antenna and radiate it into space.

[0026] According to a preferred embodiment, the horn antennas of the spherical array of horn antennas point to the rotation center of the three-axis turntable, and each three adjacent horn antennas are arranged in an equilateral triangle to form a triplet, and the three electromagnetic signals radiated by each triplet can be synthesized into an equivalent electromagnetic signal at the rotation center of the three-axis turntable;

[0027] At any moment of scene advancement, by selecting different triplets on the spherical array and controlling the position of the equivalent electromagnetic signal in the triplets, the different positions of the target on the spherical array at that moment can be simulated, and then the motion trajectory of the target on the spherical array at each moment can be simulated according to the scene time drive;

[0028] The position control unit receives the target relative angle information sent by the scene visualization and simulation control computer, calculates the triplet position corresponding to each target and controls the RF switch matrix to achieve rough control of the target echo radiation position among the triplet, calculates the relative amplitude and phase difference compensation value between the three antenna radiation signals in the triplet and controls the programmable attenuator and phase shifter to achieve precise control of the target echo radiation position within the triplet.

[0029] According to a preferred embodiment, the test evaluation computer runs the test evaluation software to receive the scene situation and radar detection results, and completes the evaluation calculation of the evaluation indicators and displays the evaluation results according to the simulation test task requirements.

[0030] According to a preferred embodiment, the simulation test system also includes a network switch, which connects the semi-physical radar, three-axis turntable, scene visualization and simulation control computer, radar echo simulator, antenna array and feed subsystem position control unit, and test evaluation computer into a local area network, and uses Ethernet UDP communication to achieve mutual communication.

[0031] On the other hand, the present invention also discloses:

[0032] A simulation test method applicable to a radiation-type semi-physical radar, using the above-mentioned simulation test system, the simulation test method comprises:

[0033] Step 1: Install the semi-physical radar antenna on the three-axis turntable, and connect the RF transmission and receiving channels of the radar integrated processing unit to the radar antenna with RF cables;

[0034] Step 2: Scenario visualization and simulation control The computer runs the scenario editing software to set the scenario scenario situation, target scattering characteristics, target echo RF channel correspondence and other test parameters according to the simulation test plan, and generate the scenario script file;

[0035] Step 3: Connect the RF transmission channel of the integrated processing unit to the radar echo simulator with an RF cable, and connect each RF output channel of the radar echo simulator to each RF input channel corresponding to the antenna array and the feed subsystem with an RF cable according to the corresponding relationship between the target echo RF channels;

[0036] Step 4: The scene visualization and simulation control computer runs the simulation guidance software to load the assumption script file, deduce the simulation process, and distribute the scene situation; the scene visualization and simulation control computer runs the electromagnetic simulation calculation software to receive the scene situation, calculates the relative distance and radial velocity data of each target and sends it to the radar echo simulator, calculates the target relative angle information and sends it to the antenna array and the feed subsystem; the scene visualization and simulation control computer runs the three-dimensional situation software to receive the scene situation and display it based on the three-dimensional map;

[0037] Step 5: The three-axis turntable receives the scene situation data distributed by the scene visualization and simulation control computer, and completes the simulation of the radar antenna motion posture;

[0038] Step 6: The radar display and control controls the semi-physical radar to work according to the simulation and test design requirements. The radar integrated processing unit generates a radar transmission RF signal according to the function scheduling and sends it to the radar antenna and radar echo simulator through the RF cable; the radar antenna receives the radar transmission RF signal from the radar integrated processing unit and converts it into an electromagnetic signal to radiate into space;

[0039] Step 7: The radar echo simulator down-converts, samples and measures the frequency of the RF signal input through the RF cable, receives the relative distance and radial velocity of each target sent by the electromagnetic simulation calculation software, calculates the corresponding signal transmission delay and Doppler shift parameters, calculates the power attenuation parameters based on the target radial distance and target scattering characteristic parameters, and performs delay, Doppler frequency shift and amplitude modulation on the sampled data in turn according to the target through FPGA. The modulated intermediate frequency signal is digitally up-converted and D / A converted to generate an RF signal, which is output to the RF input channel corresponding to the antenna array and the feed subsystem through the RF output channel corresponding to the target echo;

[0040] Step 8: The position control unit of the antenna array and feed subsystem receives the target relative angle information sent by the electromagnetic simulation calculation software of the scene visualization and simulation control computer, calculates the triplet position corresponding to each target and controls the RF switch matrix to achieve rough control of the target echo radiation position between the triplet, calculates the relative amplitude and phase difference compensation value between the three antenna radiation signals in the triplet and controls the programmable attenuator and phase shifter to achieve precise control of the target echo radiation position in the triplet; the horn antenna in the triplet converts the RF signal into an electromagnetic signal to radiate into space, and synthesizes an equivalent electromagnetic signal at the rotation center of the three-axis turntable;

[0041] Step 9: The radar antenna of the semi-physical radar receives the electromagnetic signal radiated from space and converts it into a radio frequency signal for the radar integrated processing unit to process the radar function; the radar integrated processing unit calculates the radar detection result and reports it to the radar display control and test evaluation computer;

[0042] Step 10: The test evaluation computer runs the test evaluation software to receive the scene situation and radar detection results, and uses a specially designed evaluation method to complete the evaluation calculation of the evaluation indicators and display the evaluation results according to the simulation test task requirements.

[0043] The aforementioned main scheme of the present invention and its further options can be freely combined to form multiple schemes, all of which are schemes that can be adopted and claimed for protection by the present invention. After understanding the scheme of the present invention, those skilled in the art can understand that there are multiple combinations based on the prior art and common knowledge, all of which are technical schemes to be protected by the present invention, and they are not exhaustively listed here.

[0044] Beneficial effects of the present invention:

[0045] The present invention provides a complete simulation test system and method suitable for a radiation semi-physical radar, which connects a real radar into a simulation closed loop and can simulate multiple targets and their movements for the radar according to scene driving, thereby fully simulating and testing the semi-physical radar. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a schematic diagram of the principle of the simulation test system of the present invention;

[0047] Figure 2 It is a layout diagram of a spherical array of horn antennas established in an embodiment of the present invention. DETAILED DESCRIPTION

[0048] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0049] It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, and it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In addition, the present invention should be pointed out that, in the present invention, unless the specific structure, connection relationship, positional relationship, power source relationship, etc. are specifically written out, the structure, connection relationship, positional relationship, power source relationship, etc. involved in the present invention are all known by those skilled in the art on the basis of the prior art without creative work.

[0051] Example 1

[0052] refer to Figure 1 As shown, the present invention discloses a simulation test system and method suitable for a radiative semi-physical radar, wherein the system comprises: a semi-physical radar, a three-axis turntable, a scene visualization and simulation control computer, a radar echo simulator, an antenna array and a feed subsystem, a test evaluation computer, a network switch and a radio frequency cable.

[0053] Preferably, the semi-physical radar includes a radar integrated processing unit, a radar display and control, and a radar antenna.

[0054] Specifically, the radar integrated processing unit is composed of radar signal processing and information processing hardware, runs radar signal processing and information processing algorithms, calculates and generates radar transmit RF signals and sends them to the radar antenna and radar echo simulator via RF cables, receives RF signals from the radar antenna to perform radar function processing, receives control instructions from the radar display and control, and feeds back the instruction execution results and detection results, and sends the detection results to the test evaluation computer.

[0055] Specifically, the radar display and control realizes the human-computer interaction interface of the radar, sends control instructions to the radar integrated processing unit, receives and displays the instruction execution results and detection results fed back by the radar integrated processing unit.

[0056] Specifically, the radar antenna is installed on a three-axis turntable, and receives the radar transmission RF signal of the radar integrated processing unit through the RF cable, converts it into an electromagnetic signal and radiates it into space, and receives the electromagnetic signal in space, converts it into a received RF signal and sends it to the radar integrated processing unit.

[0057] Preferably, the three-axis turntable is a mechanical device that controls the direction and angle of movement, provides a radar antenna installation structure, receives scene situation data distributed by a scene visualization and simulation control computer, and completes the simulation of the radar antenna movement posture.

[0058] Preferably, the scene visualization and simulation control computer is installed with scenario editing software, simulation guidance software, electromagnetic simulation calculation software, and three-dimensional situation software.

[0059] The scene visualization and simulation control computer runs the assumption editing software to set the scene assumption situation, target scattering characteristics, target echo radio frequency channel correspondence and other test parameters according to the simulation test plan, and generates the assumption script file; the scene visualization and simulation control computer runs the simulation guidance software to load the assumption script file, deduce the simulation process, and distribute the scene situation; the scene visualization and simulation control computer runs the electromagnetic simulation calculation software to receive the scene situation, calculate the relative distance and radial velocity data of each target and send it to the radar echo simulator, calculate the target relative angle information and send it to the antenna array and feed subsystem; the scene visualization and simulation control computer runs the three-dimensional situation software to receive the scene situation and display it based on the three-dimensional map.

[0060] Preferably, the radar echo simulator down-converts, samples and measures the frequency of the RF signal input through the RF cable, receives the relative distance and radial velocity of each target sent by the electromagnetic simulation calculation software, calculates the corresponding signal transmission delay and Doppler shift parameters, calculates the power attenuation parameters based on the target radial distance and target scattering characteristic parameters, and performs delay, Doppler frequency shift and amplitude modulation on the sampled data in sequence according to the target through FPGA. The modulated intermediate frequency signal is digitally up-converted and D / A converted to generate an RF signal, which is output to the RF input channel corresponding to the antenna array and the feed subsystem through the RF output channel corresponding to the target echo.

[0061] Preferably, the antenna array and feed subsystem includes a spherical array of horn antennas, a position control unit, an RF switch matrix, a programmable attenuator, a phase shifter and a power divider. The power divider, the phase shifter, the programmable attenuator, the RF matrix switch and the horn antenna are connected in sequence through RF cables to form multiple RF channels and respectively receive each target echo RF signal output by the radar echo simulator, and then convert the RF signal into an electromagnetic signal through the horn antenna and radiate it into space.

[0062] The horn antennas in the spherical array of horn antennas point to the rotation center of the three-axis turntable, and each three adjacent horn antennas are arranged in an equilateral triangle to form a plurality of triplets. The three electromagnetic signals radiated by each triplet can be synthesized into an equivalent electromagnetic signal at the rotation center of the three-axis turntable.

[0063] At any moment in the scene advancement, by selecting different triplets on the spherical array and controlling the position of the equivalent electromagnetic signal in the triplets, the different positions of the target on the spherical array at that moment can be simulated, and then the motion trajectory of the target on the spherical array at each moment can be simulated according to the scene time drive;

[0064] The position control unit receives the target relative angle information sent by the scene visualization and simulation control computer, calculates the triplet position corresponding to each target and controls the RF switch matrix to achieve rough control of the target echo radiation position among the triplet, calculates the relative amplitude and phase difference compensation value between the three antenna radiation signals in the triplet and controls the programmable attenuator and phase shifter to achieve precise control of the target echo radiation position within the triplet.

[0065] Furthermore, the spherical array layout of the horn antenna is as follows: Figure 2 As shown in the figure, the horn antenna is installed on a spherical structure with a radius R, and R needs to meet the far-field condition of the radar antenna. The center of the sphere is located at the rotation center of the three-axis turntable. Every three adjacent horn antennas are arranged in an equilateral triangle to form multiple triplets. Each triplet contains three types of horn antennas numbered A, B, and C. All triplets form a spherical array. A three-dimensional rectangular coordinate system is established with the rotation center of the three-axis turntable as the coordinate origin. The X-axis points to the center of the spherical array, the Y-axis points to the right, and the Z-axis points directly upward. In this coordinate system, all horn antennas on the spherical array can be regarded as arranged according to the spherical longitude and latitude numbers, and the horn antennas with the same longitude column number col have the same azimuth, and the horn antennas with the same latitude row number row have the same elevation angle. The values ​​of col and row can be..., -3, -2, -1, 0, 1, 2, 3,...; at any moment of scene advancement, the horn antennas on the spherical array can be selected by selecting the triplets (row i ,col i ) to simulate the radiation position of the target i radar echo, Figure 2 The middle curve is a schematic diagram of the complete motion trajectory of target i in the scene simulated on the spherical array of horn antennas.

[0066] Preferably, the test evaluation computer runs the test evaluation software to receive the scene situation and radar detection results, and uses a specially designed evaluation method to complete the evaluation calculation of the evaluation indicators and display the evaluation results according to the simulation test task requirements. The test evaluation computer is optional.

[0067] Furthermore, the scene visualization and simulation control computer and the test evaluation computer both use Windows 10 operating system.

[0068] Preferably, the network switch connects the semi-physical radar, three-axis turntable, scene visualization and simulation control computer, radar echo simulator, antenna array and position control unit of the feed subsystem, and test evaluation computer into a local area network, and uses Ethernet UDP communication to realize mutual communication functions.

[0069] Preferably, the RF cable connects the RF transmission channel of the semi-physical radar integrated processing unit with the RF receiving channel of the radar echo simulator, and connects each RF output channel of the radar echo simulator with each RF input channel corresponding to the antenna array and the feed subsystem according to the correspondence between the target echo RF channels.

[0070] Example 2

[0071] On the basis of Example 1, this embodiment further discloses a simulation test method applicable to a radiation-type semi-physical radar, comprising the following steps:

[0072] Step 1: Install the semi-physical radar antenna on the three-axis turntable, and connect the RF transmission and receiving channels of the radar integrated processing unit to the radar antenna with RF cables.

[0073] Step 2: Scenario visualization and simulation control The computer runs the scenario editing software to set the scenario scenario situation, target scattering characteristics, target echo RF channel correspondence and other test parameters according to the simulation test plan, and generate a scenario script file.

[0074] Step 3: Connect the RF transmission channel of the integrated processing unit to the radar echo simulator with an RF cable, and connect each RF output channel of the radar echo simulator to each RF input channel corresponding to the antenna array and the feed subsystem with an RF cable according to the corresponding relationship between the target echo RF channels.

[0075] Step 4: The scene visualization and simulation control computer runs the simulation guidance software to load the scenario script file, deduce the simulation process, and distribute the scene situation; the scene visualization and simulation control computer runs the electromagnetic simulation calculation software to receive the scene situation and calculate the relative distance r of each target i and radial velocity v i The data is sent to the radar echo simulator to calculate the target relative angle (a i ,e i ) information is sent to the antenna array and feed subsystem, where i represents the target number, a is the azimuth angle, and e is the pitch angle. The scene visualization and simulation control computer runs the three-dimensional situation software to receive the scene situation and display it based on the three-dimensional map.

[0076] Step 5: The three-axis turntable receives the scene situation data distributed by the scene visualization and simulation control computer, and completes the simulation of the radar antenna motion posture.

[0077] Step 6: Control the semi-physical radar through radar display and control to work according to the simulation and test design requirements. The radar integrated processing unit generates radar transmit RF signals according to functional scheduling and sends them to the radar antenna and radar echo simulator through RF cables; the radar antenna receives the radar transmit RF signals from the radar integrated processing unit and converts them into electromagnetic signals to radiate into space.

[0078] Step 7: The radar echo simulator down-converts, samples and measures the RF signal input through the RF cable. The signal frequency obtained by the frequency measurement is set to fsamp. The relative distance r of each target sent by the electromagnetic simulation calculation software is received. i and radial velocity v i , calculate the corresponding signal transmission delay tdelay i =2*r i / C and Doppler shift parameter fdop i =2*v i *fsamp / C, where C is the speed of light, and the power attenuation parameters are calculated based on the target radial distance and target scattering characteristic parameters. Where Pt is the radar transmit power, L is the calibrated RF channel gain value, Gt is the radar antenna transmit gain, σ is the target scattering cross-sectional area, and R is the spherical array radius. The sampled data is delayed, Doppler shifted, and amplitude modulated in sequence by the FPGA according to the target. The modulated intermediate frequency signal is digitally up-converted and D / A converted to generate an RF signal, which is output to the RF input channel corresponding to the antenna array and the feed subsystem through the RF output channel corresponding to the target echo.

[0079] Step 8: The position control unit of the antenna array and the feed subsystem receives the target relative angle (a) sent by the electromagnetic simulation calculation software of the scene visualization and simulation control computer. i ,e i ) information, calculate the triplet position (row, col) corresponding to each target and control the RF switch matrix to achieve rough control of the target echo radiation position among the triplet, calculate the relative amplitude and phase difference compensation values ​​between the three antenna radiation signals in the triplet and control the programmable attenuator and phase shifter to achieve precise control of the target echo radiation position within the triplet; the horn antenna in the triplet converts the RF signal into an electromagnetic signal to radiate into space, and synthesizes an equivalent electromagnetic signal at the rotation center of the three-axis turntable.

[0080] Specifically, calculate the triple position (row i ,col i ) Figure 2 As shown, row i =(e i -P) / n, where P is the elevation angle of the 0th row antenna, n is the central angle of the arc corresponding to the height of the equilateral triangle formed by the triplet, and row is the latitude row number of the array antenna, which can be ..., -3, -2, -1, 0, 1, 2, 3, ...; col i =2*(a i-Y) / m, where Y is the azimuth angle of the 0th column antenna, m is the central angle corresponding to the arcs of the sides of the spherical equilateral triangle formed by the triplet, and col is the meridian column number of the array antenna, which can be ..., -3, -2, -1, 0, 1, 2, 3, ...; then the RF switch matrix is ​​controlled accordingly.

[0081] Specifically, the relative amplitude E between the three antenna radiation signals in the triplet is calculated 1 、E 2 、E 3 hour, Among them, a i 、e i is the relative azimuth and elevation angle of target i, φ 1 ,φ 2 ,φ 3 is the azimuth angle of the three antennas of the triplet, θ 1 ,θ 2 ,θ 3 is the elevation angle of the three antennas of the triplet; then the corresponding programmable attenuator control word is generated for control.

[0082] Specifically, when calculating the phase difference compensation value between the three antenna radiation signals in the triplet, first query the calibration table to obtain the phase difference of the three antenna radiation signals in the triplet at the rotation center of the three-axis turntable, calculate the compensation value that makes the phase equal, and then generate the corresponding phase shifter control word for control.

[0083] Step 9: The radar antenna of the semi-physical radar receives the electromagnetic signal radiated from space and converts it into a radio frequency signal for the radar integrated processing unit to perform radar function processing; the radar integrated processing unit calculates the radar detection result and reports it to the radar display control and test evaluation computer.

[0084] Step 10: The test evaluation computer runs the test evaluation software to receive the scene situation and radar detection results, and uses a specially designed evaluation method to complete the evaluation calculation of the evaluation indicators and display the evaluation results according to the simulation test task requirements.

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A simulation test system suitable for a radiation-type semi-physical radar, characterized in that: The simulation test system includes: a semi-physical radar, a three-axis turntable, a scene visualization and simulation control computer, a radar echo simulator, an antenna array and a feed subsystem, and a test evaluation computer. The semi-physical radar transmits radio frequency signals, receives space electromagnetic signals, performs radar function processing, calculates targets and sends them via Ethernet; The three-axis turntable provides a radar antenna mounting structure and is configured to receive scene situation data distributed by a scene visualization and simulation control computer and complete the simulation of the radar antenna motion posture; The scene visualization and simulation control computer is configured to complete scene planning, deduce simulation processes, distribute scene situations, calculate target space data, and perform three-dimensional situation display; The radar echo simulator is configured to perform time delay, Doppler frequency shift and amplitude modulation on the radar transmission radio frequency signal through FPGA and output a target echo simulation radio frequency signal; The antenna array and feed subsystem performs rough and precise simulation of the target position by controlling the relative amplitude and phase difference compensation values ​​of the radio frequency switch matrix and the spherical array triplet, and converts the target echo radio frequency signal into an electromagnetic signal to radiate into space; The test evaluation computer is configured to calculate and display evaluation indicators.

2. The simulation test system according to claim 1, characterized in that: The semi-physical radar includes a radar integrated processing unit, a radar display and control unit, and a radar antenna. The radar integrated processing unit is used to calculate and generate radar transmission radio frequency signals and send them to the radar antenna and radar echo simulator via radio frequency cables, receive the received radio frequency signals from the radar antenna to perform radar function processing, receive control instructions for radar display and control, and feed back instruction execution results and detection results, and send the detection results to the test evaluation computer; The radar display and control is used to realize human-computer interaction of the radar, send control instructions to the radar integrated processing unit, receive and display the instruction execution results and detection results fed back by the radar integrated processing unit; The radar antenna is installed on a three-axis turntable, receives the radar transmission radio frequency signal of the radar integrated processing unit through the radio frequency cable, converts it into an electromagnetic signal and radiates it into space, and receives the electromagnetic signal in space, converts it into a received radio frequency signal and sends it to the radar integrated processing unit.

3. The simulation test system according to claim 2, characterized in that: The simulation test system also includes a radio frequency cable, which connects the radio frequency transmission channel of the semi-physical radar integrated processing unit with the radio frequency receiving channel of the radar echo simulator, and connects each radio frequency output channel of the radar echo simulator with each radio frequency input channel corresponding to the antenna array and the feed subsystem according to the corresponding relationship between the target echo radio frequency channels.

4. The simulation test system according to claim 2, characterized in that: The scene visualization and simulation control computer hardware is internally installed with scenario editing software, simulation guidance software, electromagnetic simulation calculation software, and three-dimensional situation software; The scenario visualization and simulation control computer runs the scenario editing software to set the scenario scenario situation, target scattering characteristics, target echo RF channel correspondence and other test parameters according to the simulation test plan, and generate the scenario script file; The scenario visualization and simulation control computer runs the simulation guidance software to load the scenario script file, deduce the simulation process, and distribute the scenario situation; The scene visualization and simulation control computer runs the electromagnetic simulation software to receive the scene situation, calculate the relative distance and radial velocity data of each target and send them to the radar echo simulator, calculate the relative angle information of the target and send it to the antenna array and the feed subsystem; The scene visualization and simulation control computer runs the three-dimensional situation software to receive the scene situation and display it based on the three-dimensional map.

5. The simulation test system according to claim 1, characterized in that: The radar echo simulator performs down-conversion, sampling and frequency measurement on the radio frequency signal input through the radio frequency cable, receives the relative distance and radial velocity of each target sent by the electromagnetic simulation calculation software, calculates the corresponding signal transmission delay and Doppler shift parameters, calculates the power attenuation parameters based on the target radial distance and target scattering characteristic parameters, and performs delay, Doppler frequency shift and amplitude modulation on the sampled data in turn according to the target through FPGA. The modulated intermediate frequency signal is digitally up-converted and D / A converted to generate a radio frequency signal, which is output to the antenna array and the radio frequency input channel corresponding to the feed subsystem through the radio frequency output channel corresponding to the target echo.

6. The simulation test system according to claim 1, characterized in that: The antenna array and feed subsystem includes a spherical array of horn antennas, a position control unit, a radio frequency switch matrix, a programmable attenuator, a phase shifter and a power divider. The power divider, phase shifter, programmable attenuator, RF matrix switch, and horn antenna are connected in sequence through RF cables to form several RF channels, which respectively receive each target echo RF signal output by the radar echo simulator, and then convert the RF signal into an electromagnetic signal through the horn antenna and radiate it into space.

7. The simulation test system according to claim 6, characterized in that: The horn antennas of the spherical array of horn antennas point to the rotation center of the three-axis turntable, and each three adjacent horn antennas are arranged in an equilateral triangle to form a triplet, and the three electromagnetic signals radiated by each triplet can be synthesized into an equivalent electromagnetic signal at the rotation center of the three-axis turntable; At any moment of scene advancement, by selecting different triplets on the spherical array and controlling the position of the equivalent electromagnetic signal in the triplets, the different positions of the target on the spherical array at that moment can be simulated, and then the motion trajectory of the target on the spherical array at each moment can be simulated according to the scene time drive; The position control unit receives the target relative angle information sent by the scene visualization and simulation control computer, calculates the triplet position corresponding to each target and controls the RF switch matrix to achieve rough control of the target echo radiation position among the triplet, calculates the relative amplitude and phase difference compensation value between the three antenna radiation signals in the triplet and controls the programmable attenuator and phase shifter to achieve precise control of the target echo radiation position within the triplet.

8. The simulation test system according to claim 1, characterized in that: The test evaluation computer runs the test evaluation software to receive the scene situation and radar detection results, and completes the evaluation calculation of the evaluation indicators and the display of the evaluation results according to the simulation test task requirements.

9. The simulation test system according to claim 1, characterized in that: The simulation test system also includes a network switch, which connects the semi-physical radar, the three-axis turntable, the scene visualization and simulation control computer, the radar echo simulator, the position control unit of the antenna array and the feed subsystem, and the test evaluation computer into a local area network, and uses Ethernet UDP communication to achieve mutual communication.

10. A simulation test method suitable for a radiation-type semi-physical radar, characterized in that: Using the simulation test system according to any one of claims 1 to 9, the simulation test method comprises: Step 1: Install the semi-physical radar antenna on the three-axis turntable, and connect the RF transmission and receiving channels of the radar integrated processing unit to the radar antenna with RF cables; Step 2: Scenario visualization and simulation control The computer runs the scenario editing software to set the scenario scenario situation, target scattering characteristics, target echo RF channel correspondence and other test parameters according to the simulation test plan, and generate the scenario script file; Step 3: Connect the RF transmission channel of the integrated processing unit to the radar echo simulator with an RF cable, and connect each RF output channel of the radar echo simulator to each RF input channel corresponding to the antenna array and the feed subsystem with an RF cable according to the corresponding relationship between the target echo RF channels; Step 4: The scene visualization and simulation control computer runs the simulation guidance software to load the assumption script file, deduce the simulation process, and distribute the scene situation; the scene visualization and simulation control computer runs the electromagnetic simulation calculation software to receive the scene situation, calculates the relative distance and radial velocity data of each target and sends it to the radar echo simulator, calculates the target relative angle information and sends it to the antenna array and the feed subsystem; the scene visualization and simulation control computer runs the three-dimensional situation software to receive the scene situation and display it based on the three-dimensional map; Step 5: The three-axis turntable receives the scene situation data distributed by the scene visualization and simulation control computer, and completes the simulation of the radar antenna motion posture; Step 6: The radar display and control controls the semi-physical radar to work according to the simulation and test design requirements. The radar integrated processing unit generates a radar transmission RF signal according to the function scheduling and sends it to the radar antenna and radar echo simulator through the RF cable; the radar antenna receives the radar transmission RF signal from the radar integrated processing unit and converts it into an electromagnetic signal to radiate into space; Step 7: The radar echo simulator down-converts, samples and measures the frequency of the RF signal input through the RF cable, receives the relative distance and radial velocity of each target sent by the electromagnetic simulation calculation software, calculates the corresponding signal transmission delay and Doppler shift parameters, calculates the power attenuation parameters based on the target radial distance and target scattering characteristic parameters, and performs delay, Doppler frequency shift and amplitude modulation on the sampled data in turn according to the target through FPGA. The modulated intermediate frequency signal is digitally up-converted and D / A converted to generate an RF signal, which is output to the RF input channel corresponding to the antenna array and the feed subsystem through the RF output channel corresponding to the target echo; Step 8: The position control unit of the antenna array and feed subsystem receives the target relative angle information sent by the electromagnetic simulation calculation software of the scene visualization and simulation control computer, calculates the triplet position corresponding to each target and controls the RF switch matrix to achieve rough control of the target echo radiation position between the triplet, calculates the relative amplitude and phase difference compensation value between the three antenna radiation signals in the triplet and controls the programmable attenuator and phase shifter to achieve precise control of the target echo radiation position in the triplet; the horn antenna in the triplet converts the RF signal into an electromagnetic signal to radiate into space, and synthesizes an equivalent electromagnetic signal at the rotation center of the three-axis turntable; Step 9: The radar antenna of the semi-physical radar receives the electromagnetic signal radiated from space and converts it into a radio frequency signal for the radar integrated processing unit to process the radar function; the radar integrated processing unit calculates the radar detection result and reports it to the radar display control and test evaluation computer; Step 10: The test evaluation computer runs the test evaluation software to receive the scene situation and radar detection results, and uses a specially designed evaluation method to complete the evaluation calculation of the evaluation indicators and display the evaluation results according to the simulation test task requirements.

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