Radio frequency signal simulation method and system for anti-target jitter test of aeronautical equipment

Abstract

The invention discloses a radio frequency signal simulation method and system for an anti-target jitter test of aviation equipment. The radio frequency signal simulation system comprises a master console, a high-speed real-time simulation machine, a target signal generation system and an array feed control system. According to the method, the problem that radio frequency signals are difficult to simulate due to radar transmitting / receiving intervals or target aircraft jittering in the testing process of the aviation equipment is solved, the radiation deviation of the target radio frequency signals can be effectively simulated when the method is used for introducing an aviation equipment semi-physical simulation system, the complete performance index testing of the aviation equipment is achieved, and the test efficiency is improved. The guidance precision of the aviation equipment can be assessed more vividly, and suggestions and use guidance are provided for use of the introduced aviation equipment in an external field.

Description

Technical Field

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

[0002] Since the radar of imported aviation equipment cannot receive the target echo signal during the operation of the transmitter or the target aircraft is constantly vibrating or shaking during the field flight, it will cause the angle measurement deviation of the radar seeker of the imported aviation equipment. These deviations actually occur during the equipment combat process. However, in the ground testing of imported aviation equipment in the past, there was no large-scale array feeding system, target signal generation system, and no target external dimensions and jitter sample database was established. As a result, these links were easily overlooked in the ground testing in the past, resulting in the inability to simulate the RF signal radiation angle deviation caused by the transmission / reception interval of the radar of the imported aviation equipment or the aircraft jitter, resulting in insufficient or incomplete confidence in the test results of the imported aviation equipment. Summary of the Invention

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

[0004] The technical solution adopted in the present invention is: A radio frequency signal simulation method for anti-target jitter testing of aviation equipment, comprising the following steps: Step 1: During the aviation equipment test, the main control console selects the target drone type, target altitude, and speed test conditions based on the actual field requirements, and transmits the selected information to the high-speed real-time simulator via optical fiber signals; Step 2: The high-speed real-time simulator receives the optical fiber signal and selects the target jitter sample parameters and physical dimension parameters from the library of all field target jitter data and physical dimension parameters established by the high-speed real-time simulator according to the target drone type required by the main control console, and uses them as sample parameter input; Step 3: The high-speed real-time simulator calculates the target jitter angle; the target angle measured by the aviation equipment radar seeker is divided into high and low Y-direction angles and horizontal Z-direction angles. The high-speed real-time simulator divides the radar signal radiation angle deviation caused by the aviation equipment radar transmission / reception interval and the target jitter, that is, the target jitter angle, into high and low deviation angles. Horizontal deviation angle ; The initial height deviation angle , horizontal deviation angle They are: = 、 ; The height deviation angle at the i-th moment , horizontal deviation angle They are: , , in, , ; U0, U1...U i ; V0, V1...V i is a normal distribution sample of N(0,1) with mean 0 and variance 1; is the Y-axis deviation of the target entity in the missile-target coordinate system, The Z-axis deviation of the target entity in the missile-target coordinate system; is the jitter coefficient in the target jitter sample parameter, The physical dimensions of the target; is the target machine to missile system transformation matrix, is the transformation matrix from the missile body coordinate system to the missile-target line-of-sight coordinate system, For aviation equipment radar transmission / reception interval, is the distance between the aviation equipment and the target; Step 4: The high-speed real-time simulator calculates the actual speed and angle of the target; the actual speed of the target is the actual flight speed of the target aircraft. , which is also the target jitter speed after mixing; the target radar’s radiation high and low angles and horizontal angle They are 、 ; in, They are the distance modulus and the distance vector projection value in space between the aviation equipment and the target respectively; the high and low deviation angles of the target jitter angle are Horizontal deviation angle Radiation elevation angle relative to target radar and horizontal angle Perform superposition and mixing to obtain the actual height angle of the mixed target = , the actual horizontal angle of the target = ; Step 5: The target signal generation system receives the RF reference signal generated by the aviation equipment The actual speed value of the target is received by the high-speed real-time simulator via optical fiber. , then the frequency value can be changed to ,in is the wavelength; it is converted into an intermediate frequency signal by the down-conversion module, and a digital signal is obtained after analog-to-digital sampling, and digital down-conversion processing is performed to perform delay modulation ( ), T is the signal processing time, T is the delay time, Doppler modulation , frequency modulation , amplitude modulation and phase modulation , in , perform digital-to-analog output microwave up-conversion module, and finally output the RF target signal frequency expression as: , and sent to the input of the microwave precision control system of the array feed control system; Step 6: The high-speed real-time simulator will shake the mixed target angle and , the array feed system is sent through the optical fiber signal; the RF signal generated by the target signal generation system undergoes signal attenuation, phase shifting, amplification, and opening of the matrix switch group in the microwave fine control system and microwave coarse control system of the array feed control system, and after power combination, the RF signal is finally and The radiation is synthesized at the antenna horn for detection and reception by aviation equipment.

[0005] A radio frequency signal simulation system for 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; The main control console binds the target type to the high-speed real-time simulator and aviation equipment respectively. The high-speed real-time simulator completes the calculation of the target jitter speed signal and the target jitter angle signal according to the specific target and external battlefield conditions, and transmits the mixed target jitter speed signal to the target signal generation system. The target signal generation system combines the aviation equipment radio frequency reference signal, and completes the radar signal generation radio frequency signal through signal microwave down-conversion, sampling, modulation, digital-to-analog conversion, and up-conversion, and outputs it to the array feed control system; the high-speed real-time simulator transmits the mixed target jitter angle signal to the array feed control system, and after signal attenuation, phase shifting, amplification, opening the corresponding angle matrix switch, and signal power combination, it is radiated from the corresponding angle antenna array for detection and reception by the aviation equipment.

[0006] Due to the adoption of the above technical solution, the present invention has the following advantages: The present invention overcomes the difficulty in simulating radio frequency signals caused by the radar transmission / reception interval or the jitter of the target aircraft during the test 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, thereby achieving complete testing of aviation equipment performance indicators, more realistically assessing the guidance accuracy of aviation equipment, and providing suggestions and usage guidance for the field use of imported aviation equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is the overall joint test structure diagram of the present invention.

[0008] Figure 2 It is a schematic diagram of the present invention. DETAILED DESCRIPTION

[0009] The present invention will be further explained below with reference to the accompanying drawings and embodiments, which should not be used to limit 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.

[0010] Combined with attachment Figure 1-2 The RF signal simulation method for anti-target jitter testing of aviation equipment shown in the figure has the following specific steps: Step 1: During aviation equipment testing, the main control console selects the target drone type, target altitude, and speed test conditions based on actual field requirements, and transmits the selected information to the high-speed real-time simulator via optical fiber signals.

[0011] Step 2: The high-speed real-time simulator receives the optical fiber signal and selects the target jitter sample parameters and physical size parameters from the library of all field target jitter data and physical size parameters established by the high-speed real-time simulator according to the target type required by the main control console, and uses them as sample parameter input.

[0012] Step 3: The high-speed real-time simulator calculates the target jitter angle; the target angle measured by the aviation equipment radar seeker is divided into high and low Y-direction angles and horizontal Z-direction angles. The high-speed real-time simulator divides the radar signal radiation angle deviation caused by the aviation equipment radar transmission / reception interval and the target jitter, that is, the target jitter angle, into high and low deviation angles. Horizontal deviation angle ; The initial height deviation angle , horizontal deviation angle They are: = 、 ; The height deviation angle at the i-th moment , horizontal deviation angle They are: , , in, , ; U0, U1...U i ; V0, V1...V I is a normal distribution sample of N(0,1) with mean 0 and variance 1; is the Y-axis deviation of the target entity in the missile-target coordinate system, The Z-axis deviation of the target entity in the missile-target coordinate system; is the jitter coefficient in the target jitter sample parameter, The physical dimensions of the target; is the target machine to missile system transformation matrix, is the transformation matrix from the missile body coordinate system to the missile-target line-of-sight coordinate system, For aviation equipment radar transmission / reception interval, The distance between the aviation equipment and the target.

[0013] Step 4: The high-speed real-time simulator calculates the actual speed and angle of the target; the actual speed of the target is the actual flight speed of the target aircraft. , which is also the target jitter speed after mixing; the target radar’s radiation high and low angles and horizontal angle They are 、 ; in, They are the distance modulus and the distance vector projection value in space between the aviation equipment and the target respectively; the high and low deviation angles of the target jitter angle are Horizontal deviation angle Radiation elevation angle relative to target radar and horizontal angle Perform superposition and mixing to obtain the actual height angle of the mixed target = , the actual horizontal angle of the target = .

[0014] Step 5: The target signal generation system receives the RF reference signal generated by the aviation equipment The actual speed value of the target is received by the high-speed real-time simulator via optical fiber. , then the frequency value can be changed to ,in is the wavelength; it is converted into an intermediate frequency signal by the down-conversion module, and a digital signal is obtained after analog-to-digital sampling, and digital down-conversion processing is performed to perform delay modulation ( ), T is the signal processing time, T is the delay time, Doppler modulation , frequency modulation , amplitude modulation and phase modulation , in , perform digital-to-analog output microwave up-conversion module, and finally output the RF target signal frequency expression as: , and sent to the input of the microwave precision control system of the array feed control system.

[0015] Step 6: The high-speed real-time simulator will shake the mixed target angle and , the array feed system is sent through the optical fiber signal; the RF signal generated by the target signal generation system undergoes signal attenuation, phase shifting, amplification, and opening of the matrix switch group in the microwave fine control system and microwave coarse control system of the array feed control system, and after power combination, the RF signal is finally and The radiation is synthesized at the antenna horn for detection and reception by aviation equipment.

[0016] A radio frequency signal simulation system for 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; The main control console binds the target type to the high-speed real-time simulator and aviation equipment respectively. The high-speed real-time simulator completes the calculation of the target jitter speed signal and the target jitter angle signal according to the specific target and external battlefield conditions, and transmits the mixed target jitter speed signal to the target signal generation system. The target signal generation system combines the aviation equipment radio frequency reference signal, and completes the radar signal generation radio frequency signal through signal microwave down-conversion, sampling, modulation, digital-to-analog conversion, and up-conversion, and outputs it to the array feed control system; the high-speed real-time simulator transmits the mixed target jitter angle signal to the array feed control system, and after signal attenuation, phase shifting, amplification, opening the corresponding angle matrix switch, and signal power combination, it is radiated from the corresponding angle antenna array for detection and reception by the aviation equipment.

[0017] The parts not described in detail in this invention are prior art.

[0018] The embodiments selected herein for the purpose of disclosing the invention are presently considered suitable, but it should be understood that the invention is intended to include all variations and modifications of the embodiments that fall within the scope of the concept and invention.

Claims

1. A radio frequency signal simulation method for anti-target jitter testing of aviation equipment, characterized in that: The specific steps are: Step 1: During the aviation equipment test, the main control console selects the target drone type, target altitude, and speed test conditions based on the actual field requirements, and transmits the selected information to the high-speed real-time simulator via optical fiber signals; Step 2: The high-speed real-time simulator receives the optical fiber signal and selects the target jitter sample parameters and physical dimension parameters from the library of all field target jitter data and physical dimension parameters established by the high-speed real-time simulator according to the target drone type required by the main control console, and uses them as sample parameter input; Step 3: The high-speed real-time simulator calculates the target jitter angle; the target angle measured by the aviation equipment radar seeker is divided into high and low Y-direction angles and horizontal Z-direction angles. The high-speed real-time simulator divides the radar signal radiation angle deviation caused by the aviation equipment radar transmission / reception interval and the target jitter, that is, the target jitter angle, into high and low deviation angles. Horizontal deviation angle ; The initial elevation deviation angle is , horizontal deviation angle They are = 、 ; The height deviation angle at the i-th moment , horizontal deviation angle They are: ， ， in, , , U0, U1...U i ; V0, V1...V I is a normal distribution sample of N(0,1) with mean 0 and variance 1; is the Y-axis deviation of the target entity in the missile-target coordinate system, The Z-axis deviation of the target entity in the missile-target coordinate system; is the jitter coefficient in the target jitter sample parameter, The physical dimensions of the target; is the target machine to missile system transformation matrix, is the transformation matrix from the missile body coordinate system to the missile-target line-of-sight coordinate system, For aviation equipment radar transmission / reception interval, is the distance between the aviation equipment and the target; Step 4, the high-speed real-time simulator calculates the actual speed and angle of the target; the actual speed of the target is the actual flight speed of the target aircraft , which is also the target jitter speed after mixing; Radiation elevation and depression angles of target radar and horizontal angle They are: 、 ;in, They are the distance modulus and the distance vector projection value in space between the aviation equipment and the target respectively; the high and low deviation angles of the target jitter angle are Horizontal deviation angle Radiation elevation angle relative to target radar and horizontal angle Perform superposition and mixing to obtain the actual height angle of the mixed target = , the actual horizontal angle of the target = ; Step 5: The target signal generation system receives the RF reference signal generated by the aviation equipment The actual speed value of the target is received by the high-speed real-time simulator via optical fiber. , then the frequency value can be changed to ,in is the wavelength; it is converted into an intermediate frequency signal by the down-conversion module, and a digital signal is obtained after analog-to-digital sampling, and digital down-conversion processing is performed to perform delay modulation ( ), T is the signal processing time, T is the delay time, Doppler modulation , frequency modulation , amplitude modulation and phase modulation , in , perform digital-to-analog output microwave up-conversion module, and finally output the RF target signal frequency expression as: , and sent to the input of the microwave precision control system of the array feed control system; Step 6, the high-speed real-time simulator will mix the target jitter angle and , the array feed system is sent through the optical fiber signal; the RF signal generated by the target signal generation system undergoes signal attenuation, phase shifting, amplification, and opening of the matrix switch group in the microwave fine control system and microwave coarse control system of the array feed control system, and after power combination, the RF signal is finally and The radiation is synthesized at the antenna horn for detection and reception by aviation equipment.

2. A radio frequency signal simulation system for anti-target jitter testing of aviation equipment, characterized by: It includes a main control console, a high-speed real-time simulator, a target signal generating system and an array feed control system; the main control console binds the target type to the high-speed real-time simulator and the aviation equipment respectively; the high-speed real-time simulator completes the calculation of the target jitter speed signal and the target jitter angle signal according to the specific target and the external battlefield conditions, and transmits the mixed target jitter speed signal to the target signal generating system; the target signal generating system combines the aviation equipment radio frequency reference signal, and completes the radar signal generation radio frequency signal through signal microwave down-conversion, sampling, modulation, digital-to-analog conversion, and up-conversion, and outputs it to the array feed control system; the high-speed real-time simulator transmits the mixed target jitter angle signal to the array feed control system, and after signal attenuation, phase shifting, amplification, opening the corresponding angle matrix switch, and signal power combination, it is radiated from the corresponding angle antenna array for detection and reception by the aviation equipment.

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