A method and system for simulating radio frequency signals for anti-target jitter testing of airborne equipment

Abstract

This invention introduces a method and system for simulating radio frequency (RF) signals in anti-target jitter testing of aviation equipment, including a main control console, a high-speed real-time simulator, a target signal generation system, and an array feed control system. This invention overcomes the difficulty in simulating RF signals caused by radar transmit / receive intervals or target aircraft jitter during aviation equipment testing. By applying this method to a hardware-in-the-loop (HIL) simulation system for imported aviation equipment, it can effectively simulate the radiation deviation of target RF signals, achieving complete performance testing of aviation equipment and more realistically assessing the guidance accuracy of aviation equipment. This provides suggestions and guidance for the field use of imported aviation equipment.

Description

Technical Field

[0001] This invention relates to the field of aviation equipment performance testing technology, and in particular to a radio frequency signal simulation method and system for testing the anti-target jitter of aviation equipment. Background Technology

[0002] Because imported aircraft radar cannot receive target echo signals during transmitter operation, or because the target aircraft is constantly vibrating or shaking during field flight, the angle measurement of the radar seeker head of the imported aircraft radar will be deviated. These deviations are actually occurring during the equipment's combat process. However, in the past ground tests of imported aircraft, there was no large array power supply system, target signal generation system, or a database of target shape dimensions and shaking samples. As a result, these aspects were easily overlooked in the past ground tests. Consequently, the deviation of the radio frequency signal radiation angle caused by the transmission / reception interval of the imported aircraft radar or the shaking of the aircraft could not be simulated, resulting in insufficient confidence or incompleteness of the test results of the imported aircraft. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a radio frequency signal simulation method and system for testing the anti-target jitter of aviation equipment, thereby improving the confidence of the test results of imported aviation equipment and more comprehensively testing the combat performance of the equipment.

[0004] The technical solution adopted in this invention is:

[0005] A method for simulating radio frequency signals in anti-target jitter testing of aircraft equipment, comprising the following steps:

[0006] Step 1: In the testing of aviation equipment, the main control console selects the target drone type, target altitude, and speed test conditions according to the actual needs of the field, and transmits the selected information to the high-speed real-time simulator through fiber optic signals.

[0007] Step 2: The high-speed real-time simulator receives the fiber optic signal and, based on the target type required by the main control console, selects the target jitter sample parameters and physical dimension parameters from all the field target jitter data and shape dimension parameter libraries established by the high-speed real-time simulator, and uses these as the sample parameter input.

[0008] Step 3: The high-speed real-time simulator calculates the target jitter angle. The target angle measured by the aircraft equipment radar seeker is divided into elevation (Y-axis) angle and horizontal (Z-axis) angle. The high-speed real-time simulator further divides the radar signal radiation angle deviation caused by the radar transmit / receive interval and target jitter (i.e., the target jitter angle) into elevation deviation angle. Horizontal deviation angle Then the initial elevation deviation angle Horizontal deviation angle They are respectively:

[0009] = , ;

[0010] The elevation deviation angle at time i Horizontal deviation angle They are respectively:

[0011] ,

[0012] ,

[0013] in, , ;

[0014] U0, U1...U i V0, V1...V i The sample is an N(0,1) normally distributed sample with a mean of 0 and a variance of 1. The Y-axis deviation of the target entity in the target-missile coordinate system. The Z-axis deviation of the target entity in the target-missile coordinate system; The jitter coefficient in the target jitter sample parameters. The physical dimensions of the target's external shape; The target aircraft body to missile system transformation matrix. This is the transformation matrix from the projectile coordinate system to the projectile-target line-of-sight coordinate system. For radar transmit / receive intervals in aviation equipment, The distance between the aircraft and the target;

[0015] Step 4: The high-speed real-time simulator calculates the actual speed and angle values ​​of the target; the actual speed of the target is the actual flight speed of the target drone. It is also the target jitter speed after mixing; the radiation elevation angle of the target radar. and horizontal angle They are respectively , ;

[0016] in, These are the distance modulus and spatial projection values ​​of the distance vector between the aircraft and the target; the elevation deviation angle of the target jitter angle. Horizontal deviation angle Radiation elevation angle with the target radar and horizontal angle By performing superposition and blending, the actual elevation angle of the target after blending is obtained. = Target actual level angle = ;

[0017] Step 5: The target signal generation system receives the radio frequency reference signal generated by the aircraft equipment. The actual speed value of the target is received and transmitted via fiber optic receiver to a high-speed real-time simulator. Then it can be converted into a frequency value ,in The wavelength is used; it is down-converted to an intermediate frequency signal by a down-conversion module, and after analog-to-digital sampling, a digital signal is obtained, which is then digitally down-converted and delayed modulated. T is the signal processing time. T represents the delay time and Doppler modulation. Frequency modulation Amplitude Modulation and phase modulation ,

[0018] in The microwave upconversion module performs digital-to-analog output, and the final output RF target signal frequency expression is: And send it to the input of the microwave precision control system of the array feed control system;

[0019] Step Six: The high-speed real-time simulator calculates the mixed target jitter angle. and The signal is transmitted via fiber optic signal transmission to the array feed system. The radio frequency signal generated by the target signal generation system undergoes signal attenuation, phase shifting, amplification, and matrix switching in the microwave fine control system and microwave coarse control system of the array feed control system. After power combining, the radio frequency signal finally reaches... and The antenna horn emits a composite radiation for detection and reception by aviation equipment.

[0020] A radio frequency signal simulation system for anti-target jitter testing of aviation equipment includes a main control console, a high-speed real-time simulator, a target signal generation system, and an array power supply control system;

[0021] The main control console assigns target types to the high-speed real-time simulator and the aviation equipment respectively. The high-speed real-time simulator calculates the target jitter velocity signal and the target jitter angle signal according to the specific target and the field battlefield conditions, and transmits the mixed target jitter velocity signal to the target signal generation system. The target signal generation system combines the aviation equipment's radio frequency reference signal, and completes the radar signal generation radio frequency signal output to the array feed control system after microwave down-conversion, sampling, modulation, digital-to-analog conversion, and up-conversion. The high-speed real-time simulator transmits the mixed target jitter angle signal to the array feed control system. After signal attenuation, phase shifting, amplification, opening the corresponding angle matrix switch, and signal power combining, the signal is radiated from the corresponding angle antenna array for detection and reception by the aviation equipment.

[0022] Due to the adoption of the technical solution described above, the present invention has the following advantages:

[0023] This invention overcomes the problem of simulating radio frequency signals caused by radar transmission / reception intervals or target aircraft jitter during the testing of aviation equipment. By applying this method to the semi-physical simulation system of imported aviation equipment, the radiation deviation of the target radio frequency signal can be effectively simulated, enabling complete testing of aviation equipment performance indicators and more realistic assessment of the guidance accuracy of aviation equipment. This provides suggestions and guidance for the field use of imported aviation equipment. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0025] Figure 2 This is a schematic diagram of the present invention. Detailed Implementation

[0026] The present invention will be further explained and described below with reference to the accompanying drawings and embodiments. However, this should not be construed as limiting the scope of protection of the present invention. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0027] Combined with appendix Figure 1-2 The method for simulating radio frequency signals in the anti-target jitter test of aviation equipment, as shown, includes the following steps:

[0028] Step 1: In the testing of aviation equipment, the main control console selects the target drone type, target altitude, and speed test conditions according to the actual needs of the field, and transmits the selected information to the high-speed real-time simulator via fiber optic signal.

[0029] Step 2: The high-speed real-time simulator receives the fiber optic signal and, based on the target type required by the main control console, selects the target jitter sample parameters and physical dimension parameters from all the field target jitter data and shape dimension parameter libraries established by the high-speed real-time simulator, and uses these as the input sample parameters.

[0030] Step 3: The high-speed real-time simulator calculates the target jitter angle. The target angle measured by the aircraft equipment radar seeker is divided into elevation (Y-axis) angle and horizontal (Z-axis) angle. The high-speed real-time simulator further divides the radar signal radiation angle deviation caused by the radar transmit / receive interval and target jitter (i.e., the target jitter angle) into elevation deviation angle. Horizontal deviation angle Then the initial elevation deviation angle Horizontal deviation angle They are respectively:

[0031] = , ;

[0032] The elevation deviation angle at time i Horizontal deviation angle They are respectively:

[0033] ,

[0034] ,

[0035] in, , ;

[0036] U0, U1...U i V0, V1...V I The sample is an N(0,1) normally distributed sample with a mean of 0 and a variance of 1. The Y-axis deviation of the target entity in the target-missile coordinate system. The Z-axis deviation of the target entity in the target-missile coordinate system; The jitter coefficient in the target jitter sample parameters. The physical dimensions of the target's external shape; The target aircraft body to missile system transformation matrix. This is the transformation matrix from the projectile coordinate system to the projectile-target line-of-sight coordinate system. For radar transmission / reception intervals in aviation equipment, The distance between the aircraft and the target.

[0037] Step 4: The high-speed real-time simulator calculates the actual speed and angle values ​​of the target; the actual speed of the target is the actual flight speed of the target drone. It is also the target jitter speed after mixing; the radiation elevation angle of the target radar. and horizontal angle They are respectively , ;

[0038] in, These are the distance modulus and spatial projection values ​​of the distance vector between the aircraft and the target; the elevation deviation angle of the target jitter angle. Horizontal deviation angle Radiation elevation angle with the target radar and horizontal angle By performing superposition and blending, the actual elevation angle of the target after blending is obtained. = Target actual level angle = .

[0039] Step 5: The target signal generation system receives the radio frequency reference signal generated by the aircraft equipment. The actual speed value of the target is received and transmitted via fiber optic receiver to a high-speed real-time simulator. Then it can be converted into a frequency value ,in The wavelength is used; it is down-converted to an intermediate frequency signal by a down-conversion module, and after analog-to-digital sampling, a digital signal is obtained, which is then digitally down-converted and delayed modulated. T is the signal processing time. T represents the delay time and Doppler modulation. Frequency modulation Amplitude modulation and phase modulation ,

[0040] in The microwave upconversion module performs digital-to-analog output, and the final output RF target signal frequency expression is: And send it to the input of the microwave precision control system of the array feed control system.

[0041] Step Six: The high-speed real-time simulator calculates the mixed target jitter angle. and The signal is transmitted via fiber optic signal transmission to the array feed system. The radio frequency signal generated by the target signal generation system undergoes signal attenuation, phase shifting, amplification, and matrix switching in the microwave fine control system and microwave coarse control system of the array feed control system. After power combining, the radio frequency signal finally reaches... and The antenna horn emits a composite radiation for detection and reception by aviation equipment.

[0042] A radio frequency signal simulation system for anti-target jitter testing of aviation equipment includes a main control console, a high-speed real-time simulator, a target signal generation system, and an array power supply control system;

[0043] The main control console assigns target types to the high-speed real-time simulator and the aviation equipment respectively. The high-speed real-time simulator calculates the target jitter velocity signal and the target jitter angle signal according to the specific target and the field battlefield conditions, and transmits the mixed target jitter velocity signal to the target signal generation system. The target signal generation system combines the aviation equipment's radio frequency reference signal, and completes the radar signal generation radio frequency signal output to the array feed control system after microwave down-conversion, sampling, modulation, digital-to-analog conversion, and up-conversion. The high-speed real-time simulator transmits the mixed target jitter angle signal to the array feed control system. After signal attenuation, phase shifting, amplification, opening the corresponding angle matrix switch, and signal power combining, the signal is radiated from the corresponding angle antenna array for detection and reception by the aviation equipment.

[0044] The parts of this invention not described in detail are prior art.

[0045] 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 method for simulating radio frequency signals in anti-target jitter testing of aviation equipment, characterized in that, The specific steps are as follows: Step 1: In the testing of aviation equipment, the main control console selects the target drone type, target altitude, and speed test conditions according to the actual needs of the field, and transmits the selected information to the high-speed real-time simulator through fiber optic signals. Step 2: The high-speed real-time simulator receives the fiber optic signal and, based on the target type required by the main control console, selects the target jitter sample parameters and physical dimension parameters from all the field target jitter data and shape dimension parameter libraries established by the high-speed real-time simulator, and uses these as the sample parameter input. Step 3: The high-speed real-time simulator calculates the target jitter angle. The target angle measured by the aircraft equipment radar seeker is divided into elevation (Y-axis) angle and horizontal (Z-axis) angle. The high-speed real-time simulator further divides the radar signal radiation angle deviation caused by the radar transmit / receive interval and target jitter (i.e., the target jitter angle) into elevation deviation angle. Horizontal deviation angle ; Then the initial elevation deviation angle Horizontal deviation angle They are respectively = , ; The elevation deviation angle at time i Horizontal deviation angle They are respectively: ， ， in, , , U0, U1...U i V0, V1...V I The sample is an N(0,1) normally distributed sample with a mean of 0 and a variance of 1. The Y-axis deviation of the target entity in the target-missile coordinate system. The Z-axis deviation of the target entity in the target-missile coordinate system; The jitter coefficient in the target jitter sample parameters. The physical dimensions of the target's external shape; The target aircraft body to missile system transformation matrix. This is the transformation matrix from the projectile coordinate system to the projectile-target line-of-sight coordinate system. For radar transmission / reception intervals in aviation equipment, The distance modulus between the aircraft and the target; Step 4: The high-speed real-time simulator calculates the actual speed and angle values ​​of the target; the actual speed of the target is the actual flight speed of the target drone. This is also the target jitter speed after mixing; Radiation elevation angle of the target radar and horizontal angle They are respectively: , ;in, These are the distance modulus and spatial projection values ​​of the distance vector between the aircraft and the target; the elevation deviation angle of the target jitter angle. Horizontal deviation angle Radiation elevation angle with the target radar and horizontal angle By performing superposition and blending, the actual elevation angle of the target after blending is obtained. = Target actual level angle = ; Step 5: The target signal generation system receives the radio frequency reference signal generated by the aircraft equipment. The actual speed value of the target is received and transmitted via fiber optic receiver to a high-speed real-time simulator. Then it can be converted into a frequency value ,in The wavelength is used; it is down-converted to an intermediate frequency signal by a down-conversion module, and after analog-to-digital sampling, a digital signal is obtained, which is then digitally down-converted and delayed modulated. T is the signal processing time. T represents the delay time and Doppler modulation. Frequency modulation Amplitude Modulation and phase modulation , in The microwave upconversion module performs digital-to-analog output, and the final output RF target signal frequency expression is: And send it to the input of the microwave precision control system of the array feed control system; Step Six: The high-speed real-time simulator calculates the mixed target jitter angle. and The signal is transmitted via fiber optic signal transmission to the array feed system. The radio frequency signal generated by the target signal generation system undergoes signal attenuation, phase shifting, amplification, and matrix switching in the microwave fine control system and microwave coarse control system of the array feed control system. After power combining, the radio frequency signal finally reaches... and The antenna horn emits a composite radiation for detection and reception by aviation equipment.

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