Phased array radar radio frequency simulation test system

Abstract

A phased array radar radio frequency simulation test system relates to the technical field of radar simulation test and comprises a radio frequency injection system connected with a phased array radar, and radar wave control information of a wave beam control subsystem in the phased array radar enters a wave control and echo information simulation subsystem. The wave control and echo information simulation subsystem generates simulation wave control information according to a test scene, and sends the simulation wave control information back to the phased array radar transmitting and receiving and phased array antenna subsystem as wave control information of a phased array radar array; echo information generated by the transmitting and receiving subsystem of the phased array radar and the phased array antenna subsystem enters the wave control and echo information simulation subsystem, and generated simulation echo information enters an information processor of the phased array radar to be processed. Echo information obtained through processing is sent to the radio frequency signal simulation subsystem through the transmitting, receiving and phased-array antenna subsystem; the problems that the phased array radar antenna is large in size, the number of channels is large and expenditure is large under the condition that a phased array radar is tested through a traditional testing method are solved.

Description

Technical Field

[0001] This invention relates to the field of radar simulation testing technology, and in particular to a phased array radar radio frequency simulation testing system. Background Technology

[0002] As is generally known, radar testing is typically divided into field testing and indoor testing. Field testing generally performs performance tests on the radar in actual working environments. It is suitable for relatively simple working environments with few cooperative targets, but it is more costly. For radar performance testing in multi-target and complex environments, indoor testing is generally used. It has advantages such as a large number of targets, controllable environment, and good repeatability. There are two common methods for radio frequency (RF) signal interaction in indoor testing: one is the open-feed method, which uses an antenna array to radiate RF signals in a microwave anechoic chamber and transmits them to the radar through space; the other is the wire-feed method, which uses an RF cable to directly inject the RF signal into the radar receiver. When using the open-feed method… While the inter-system connections are relatively simple, the distance between the radar and the antenna array radiating elements needs to meet far-field conditions. Therefore, when the phased array radar antenna is large, it is often not possible to use an open-feed method in a microwave anechoic chamber. When using a line-feed method, it is necessary to connect each antenna output channel. However, when the number of channels of a phased array radar is large, the implementation of its simulation test system cannot bear such a large overhead. Therefore, this invention proposes a phased array radar radio frequency signal simulation test system to solve the problem that, under the open-feed method, the size of the microwave anechoic chamber of a general simulation system is difficult to meet the requirements of far-field conditions, but the antenna array detached from the microwave anechoic chamber is difficult to simulate the target angular position motion characteristics. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention discloses a phased array radar radio frequency simulation test system.

[0004] To achieve the aforementioned objective, the present invention employs the following technical solution:

[0005] A phased array radar radio frequency simulation test system includes a radio frequency injection system connected to the phased array radar. The radio frequency injection system includes a control subsystem, a beam control and echo information simulation subsystem, an antenna motion control subsystem, a radio frequency signal simulation subsystem, and a motion support and antenna. The radar beam control information from the beam control subsystem of the phased array radar enters the beam control and echo information simulation subsystem. The simulated beam control information generated by the beam control and echo information simulation subsystem based on the test scenario is sent back to the transmitting, receiving, and phased array antenna subsystems of the phased array radar as the beam control information of the phased array radar array. The echo information generated by the transmitting, receiving, and phased array antenna subsystems of the phased array radar enters the beam control and echo information simulation subsystem. The generated simulated echo information enters the information processor of the phased array radar for processing. The processed echo information is sent to the radio frequency signal simulation subsystem through the transmitting, receiving, and phased array antenna subsystems.

[0006] The phased array radar RF simulation test system comprises a control subsystem consisting of a server, GPU, timing module, and real-time network module. This subsystem is used to complete test scenario planning, test system configuration, test scenario operation data calculation, timing signal generation and distribution, and to perform real-time control of the entire system's simulation operation. Based on the planned test scenario, it configures target generation channels, calculates motion data for each target platform within the planned scenario space, calculates data projected from the physical radar detection space to the test scenario space, and sends this data to the wave control and echo information simulation subsystem, antenna motion control subsystem, RF signal simulation subsystem, and motion support and antenna subsystem under the control of the timing module.

[0007] The aforementioned phased array radar RF simulation test system comprises an RF signal simulation subsystem that receives the low-power transmitted signal from the phased array radar and simultaneously generates the RF signals required for the radar test, namely radar target signals, clutter signals, and interference signals, according to the planned test scenario. The RF signal simulation subsystem consists of a display control unit, a baseband signal processing unit, and an RF signal processing unit. The RF signal processing unit performs frequency measurement and down-conversion processing of the low-power transmitted radar signal. The baseband signal processing unit performs digital sampling of the frequency-converted signal and, based on the test scenario operation data, performs information modulation and signal generation of radar echo signals, environmental signals, and interference signals. The RF signal processing unit then performs up-conversion processing of the signal. The display control unit receives the signal information processed by the baseband signal processing unit and displays the signal information to the operator.

[0008] The phased array radar radio frequency simulation test system consists of a beam control and echo information simulation subsystem, which comprises a display control and information processing unit and an interface unit. The interface unit is used to receive and transmit beam control and echo information from the phased array radar. After receiving the beam control and echo information from the radar, the display and information processing unit modifies the beam control pointing information and echo information, and projects the simulated target environment generated by the phased array radar and the radio frequency injection system into the space set by the system, so that the radar can complete the detection in the set space.

[0009] The phased array radar RF simulation test system includes an antenna motion control subsystem for receiving target platform information, calculating and outputting antenna motion drive signals. This subsystem comprises a display control and information processing unit and a drive and measurement unit. The display control and information processing unit receives target and interference information, motor angular position, and other feedback information calculated based on the test scenario, and completes the calculation and output of the antenna motion control drive signals. The drive and measurement unit controls the power of the drive signals and the motor drive, while also encoding and feeding back the angular position.

[0010] The phased array radar RF simulation test system includes a motion support and antenna that receive drive signals from the antenna motion control subsystem to move the antenna. Simultaneously, the antenna position is measured and fed back to the antenna motion control subsystem. The antenna also radiates the RF echo signal output by the RF signal simulation subsystem to the phased array radar. The number of motion supports and antennas is set according to the number of targets simultaneously simulated in the test scenario. The motion support and antenna include an azimuth drive mechanism, an elevation drive mechanism, and the antenna itself. The antenna is connected to the azimuth drive mechanism via the elevation drive mechanism and to the radar base via an RF cable. The azimuth drive mechanism is mounted on the radar base and drives the antenna and elevation drive mechanism to scan in the azimuth direction. The elevation drive mechanism is fixed to the azimuth drive mechanism and drives the antenna to scan in the elevation direction.

[0011] The phased array radar RF simulation test system described above mainly performs the conversion of the phased array radar antenna beam pointing in the data projection from the physical radar detection space to the test scenario space. The calculation method for its beam pointing information is as follows:

[0012] In the planned test scenario, the radar beam direction is (α0, β0), and the target's angular position is (α0, β0). t ,β t );

[0013] In real space, the angle between the simulated target's physical antenna and the radar is (α). s ,β s If ), then the modified simulation pointing calculation formula is:

[0014]

[0015] The phased array radar radio frequency simulation test system includes a beam control and echo information simulation subsystem that receives the target platform position information and the pointing information (azimuth angle, elevation angle) (α0, β0) of each radar detection beam, and modifies the beam pointing information to (α1, β1); at the same time, it receives the echo information generated by the radar detection and modifies the angle information (α1, β1) in the echo information to (α0, β0).

[0016] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0017] The phased array radar radio frequency simulation test system described in this invention simulates complex scenarios of phased array radar by projecting the actual working space of the physical radar onto the space planned for the test scene. It is convenient to use and highly efficient. This invention uses the method of spatial radiation radio frequency signals to radiate electromagnetic signals of the radar target and the environment into the radar, which can solve the problems of large antenna size, large number of channels and high overhead of phased array radar under traditional testing methods. It realizes the air-feed signal interaction of phased array radar without relying on microwave anechoic chamber. Attached Figure Description

[0018] Figure 1 This is a system block diagram of the present invention and a schematic diagram of the connection between the radar and the radar.

[0019] Figure 2 This is a flowchart of the process of the present invention. Detailed Implementation

[0020] The present invention will be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0021] Combined with appendix Figure 1-2 The aforementioned phased array radar RF simulation test system includes an RF injection system connected to the phased array radar. The RF injection system includes a control subsystem, a beam control and echo information simulation subsystem, an antenna motion control subsystem, an RF signal simulation subsystem, and a motion support and antenna. The radar beam control information from the beam control subsystem of the phased array radar enters the beam control and echo information simulation subsystem. The simulated beam control information generated by the beam control and echo information simulation subsystem based on the test scenario is sent back to the transmitting, receiving, and phased array antenna subsystems of the phased array radar as the beam control information of the phased array radar array. The echo information generated by the transmitting, receiving, and phased array antenna subsystems of the phased array radar enters the beam control and echo information simulation subsystem. The generated simulated echo information enters the information processor of the phased array radar for processing. The processed echo information is sent to the RF signal simulation subsystem through the transmitting, receiving, and phased array antenna subsystems.

[0022] Furthermore, the control subsystem consists of a server, GPU, timing module, and real-time network module. It is used to complete the work of test scenario planning, test system configuration, test scenario operation data calculation, timing signal generation and distribution, and to complete the real-time control of the entire system's simulation operation. According to the planned test scenario, it configures the target generation channel, calculates the motion data of each target platform in the planned scenario space, calculates the data projected from the physical radar detection space to the test scenario space, and sends the phased array radar to the beam control and echo information simulation subsystem, antenna motion control subsystem, radio frequency signal simulation subsystem, and motion support and antenna under the control of the timing module.

[0023] Furthermore, the radio frequency (RF) signal simulation subsystem receives the low-power transmitted signal from the phased array radar and, according to the planned test scenario, simultaneously generates the radar target signal, clutter signal, and interference signal required for the radar test. The RF signal simulation subsystem consists of a display control unit, a baseband signal processing unit, and an RF signal processing unit. The RF signal processing unit is used to perform frequency measurement and down-conversion processing of the low-power transmitted radar signal. The baseband signal processing unit performs digital sampling of the frequency-converted signal and, based on the test scenario operation data, performs information modulation and signal generation of the radar echo signal, environmental signal, and interference signal. The RF signal processing unit then performs up-conversion processing of the signal. The display control unit receives the signal information processed by the baseband signal processing unit and displays the signal information to the operator.

[0024] Furthermore, the beam control and echo information simulation subsystem consists of a display control and information processing unit and an interface unit. The interface unit is used to receive and transmit beam control and echo information from the phased array radar. After receiving the beam control and echo information from the radar, the display and information processing unit modifies the beam control pointing information and echo information, and projects the simulated target environment generated by the phased array radar and the radio frequency injection system into the space set by the system, so that the radar can complete the detection in the set space.

[0025] Furthermore, the antenna motion control subsystem is used to receive target platform information, calculate and output antenna motion drive signals. It includes a display control and information processing unit and a drive and measurement unit. The display control and information processing unit receives target and interference information, motor angular position and other feedback information calculated according to the test scenario, and completes the calculation and output of antenna motion control drive signals. The drive and measurement unit completes the power of the drive signal and motor drive, and at the same time completes the encoding and feedback of angular position.

[0026] Furthermore, the motion support and antenna receive the drive signals from the antenna motion control subsystem to complete the antenna movement. Simultaneously, the antenna position is measured and fed back to the antenna motion control subsystem. At the same time, the antenna radiates the radio frequency echo signal output by the radio frequency signal simulation subsystem to the phased array radar. The number of motion support and antenna sets is set according to the number of targets simultaneously simulated in the test scenario. The motion support and antenna include an azimuth drive mechanism, an elevation drive mechanism, and an antenna. The antenna is connected to the azimuth drive mechanism via the elevation drive mechanism and to the radar base via an radio frequency cable. The azimuth drive mechanism is mounted on the radar base and is used to drive the antenna and elevation drive mechanism to scan in the azimuth direction. The elevation drive mechanism is fixed to the azimuth drive mechanism and is used to drive the antenna to scan in the elevation direction. The motion support and antenna described are existing technologies, and the specific transmission method will not be detailed further.

[0027] Furthermore, the data calculation for the projection from the physical radar detection space to the test scenario space mainly involves the conversion of the phased array radar antenna beam pointing. The calculation method for its beam pointing information is as follows:

[0028] In the planned test scenario, the radar beam direction is (α0, β0), and the target's angular position is (α0, β0). t ,β t );

[0029] In real space, the angle between the simulated target's physical antenna and the radar is (α). s ,β s If ), then the modified simulation pointing calculation formula is:

[0030]

[0031] Furthermore, the beam control and echo information simulation subsystem receives the target platform position information and the pointing information (azimuth angle, elevation angle) (α0, β0) of each detection beam of the radar, and modifies the beam pointing information to (α1, β1); at the same time, it receives the echo information generated by the radar detection, and modifies the angle information (α1, β1) in the echo information to (α0, β0).

[0032] When implementing the phased array radar radio frequency simulation test system described in this invention, as shown in the attached figure... Figure 2 As shown, the operation steps are as follows:

[0033] a) The control subsystem first initializes, then configures the target channel according to the planned experimental scenario, completes the experimental scenario initialization, and after the simulation experiment begins, it calculates the motion data and other parameters of each target platform in the planned experimental scenario space, calculates the data projected from the physical radar detection space to the experimental scenario space, and sends the calculated antenna position control data to the antenna motion control subsystem, the radio frequency signal modulation data to the radio frequency signal simulation subsystem, and the beam control information simulation and echo information simulation data to the beam control and echo information simulation subsystem, according to the phased array radar under the control of the timing module.

[0034] b) The calculation of the data projected from the physical radar detection space to the test scenario space mainly completes the conversion of the phased array radar antenna beam pointing. The calculation method for its beam pointing information is as follows:

[0035] In the planned test scenario, the radar beam direction is (α0, β0), and the target's angular position is (α0, β0). t ,β t ).

[0036] In real space, the angle between the simulated target's physical antenna and the radar is (α). s ,β sIf ), then the modified simulation pointing calculation formula is:

[0037]

[0038] c) The radio frequency signal simulation subsystem receives the low-power transmitted signal from the radar and, according to the planned test scenario, simultaneously generates the radar target signal, clutter signal, and interference signal required for the radar test.

[0039] d) The antenna motion control subsystem receives data from the target platform, calculates and outputs antenna motion drive signals;

[0040] e) The motion support and antenna receive the drive signal from the antenna motion control subsystem, drive the motion support to complete the antenna movement, measure the antenna position and feed it back to the antenna motion control subsystem, and at the same time, the antenna radiates the radio frequency signal output by the radio frequency signal analog subsystem to the radar.

[0041] f) The beam control and echo information simulation subsystem receives the target platform position information and the pointing information (azimuth angle, elevation angle) (α0,β0) of each detection beam of the radar, and modifies the beam pointing information to (α1,β1); at the same time, it receives the echo information generated by the radar detection, and modifies the angle information (α1,β1) in the echo information to (α0,β0).

[0042] g) If the test data is recorded after the test is completed and the test is ended, or if the test is not completed, return to the step of calculating the target platform parameters and repeat step bf.

[0043] The parts of this invention not described in detail are prior art.

[0044] The embodiments selected herein for the purpose of disclosing the inventive objectives are currently considered suitable; however, it should be understood that the invention is intended to include all variations and modifications of the embodiments that fall within the scope of this concept and invention.

Claims

1. A phased array radar radio frequency simulation test system, comprising a radio frequency injection system connected to a phased array radar, characterized in that: The RF injection system includes a control subsystem, a beam control and echo information simulation subsystem, an antenna motion control subsystem, a RF signal simulation subsystem, and a motion bracket and antenna. The radar beam control information of the beam control subsystem in the phased array radar enters the beam control and echo information simulation subsystem. The simulated beam control information generated by the beam control and echo information simulation subsystem according to the test scenario is sent back to the transmitting, receiving and phased array antenna subsystems of the phased array radar as the beam control information of the phased array radar array. The echo information generated by the transmitting, receiving and phased array antenna subsystems of the phased array radar enters the beam control and echo information simulation subsystem. The generated simulated echo information enters the information processor of the phased array radar for processing. The processed echo information is sent to the RF signal simulation subsystem through the transmitting, receiving and phased array antenna subsystems.

2. The phased array radar radio frequency simulation test system according to claim 1 is characterized in that: The control subsystem consists of a server, GPU, a time synchronization module and a real-time network module. It is used to complete the test scene planning, test system configuration, test scene operation data calculation, time synchronization signal generation and distribution, and complete the real-time control of the simulation operation of the entire system; according to the planned test scene, the target generation channel is configured, and the motion data of each target platform is calculated in the planned scene space. The data projection from the physical radar detection space to the test scene space is calculated, and sent to the wave control and echo information simulation subsystem, antenna motion control subsystem, RF signal simulation subsystem and motion bracket and antenna according to the phased array radar under the control of the time synchronization module.

3. The phased array radar radio frequency simulation test system according to claim 1, characterized in that: The RF signal simulation subsystem receives the low-power transmission signal of the phased array radar, and generates the RF signals required for the radar test, namely, the radar target signal, clutter signal and interference signal, according to the planned test scenario; the RF signal simulation subsystem consists of a display control unit, a baseband signal processing unit and a RF signal processing unit. The RF signal processing unit is used to complete the frequency measurement and down-conversion processing of the radar low-power transmission signal; the baseband signal processing unit completes the digital sampling of the converted signal, and according to the test scenario operation data, completes the information modulation and signal generation of the radar echo signal, environmental signal and interference signal, and then the RF signal processing unit completes the up-conversion processing of the signal. The display control unit receives the signal information processed by the baseband signal processing unit and displays the signal information to the operator.

4. The phased array radar radio frequency simulation test system according to claim 1, characterized in that: The beam control and echo information simulation subsystem consists of a display control and information processing unit and an interface unit. The interface unit is used to complete the reception and transmission of beam control information and echo information with the phased array radar. After the display and information processing unit receives the beam control and echo information of the radar, it modifies the beam control pointing information and echo information, and projects the simulated target environment generated by the phased array radar and the RF injection system into the space set by the system, so that the radar can complete detection in the set space.

5. The phased array radar radio frequency simulation test system according to claim 1, characterized in that: The antenna motion control subsystem is used to receive target platform information, calculate and output antenna motion drive signals. It includes a display control and information processing unit and a drive and measurement unit. The display control and information processing unit receives target and interference information, motor angular position and other feedback information obtained according to the test scenario, and completes the solution and output of the antenna motion control drive signal; the drive and measurement unit completes the power and motor drive of the drive signal, and completes the encoding and feedback of the angular position.

6. The phased array radar radio frequency simulation test system according to claim 1, characterized in that: The motion bracket and antenna receive the driving signal of the antenna motion control subsystem, complete the movement of the antenna, measure the antenna position and feed it back to the antenna motion control subsystem, and at the same time, the antenna radiates the RF echo signal output by the RF signal simulation subsystem to the phased array radar; the number of sets of motion brackets and antennas is set according to the number of targets simulated simultaneously in the test scenario; the motion bracket and antenna include an azimuth transmission mechanism, a pitch transmission mechanism and an antenna, the antenna is connected to the azimuth transmission mechanism through the pitch transmission mechanism, and is connected to the radar base through a RF cable, the azimuth transmission mechanism is installed on the radar base, and is used to drive the antenna and the pitch transmission mechanism to scan in the azimuth direction, and the pitch transmission mechanism is fixed on the azimuth transmission mechanism, and is used to drive the antenna to scan in the pitch direction.

7. The phased array radar radio frequency simulation test system according to claim 1, characterized in that: The data calculation of the projection from the physical radar detection space to the test scene space mainly completes the conversion of the phased array radar antenna beam pointing. The calculation method of its beam pointing information is as follows: In the planned test scenario, the radar beam is pointed to (α0, β0) and the angular position of the target is (α t ,β t ); In real space, the angle of the physical antenna of the simulated target relative to the radar is (α s ,β s ), then the modified simulation pointing calculation formula is: The phased array radar RF simulation test system, the beam control and echo information simulation subsystem receives the target platform position information and each detection beam pointing information (azimuth, pitch angle) of the radar (α0, β0), and modifies the beam pointing information to (α1, β1); at the same time, it receives the echo information generated by the radar detection, and modifies the angle information (α1, β1) in the echo information to (α0, β0).

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