A target simulation method for introducing radar equipment into an active guidance system

Abstract

The invention relates to the field of avionics technology, and in particular to a target simulation method for an active guidance system introduced radar equipment. When used specifically, an up-conversion module can realize the first-level processing of an output signal of the introduced equipment, a target signal generator can realize the generation of a target echo and an interference signal in an intermediate frequency and digital domain, and realize the generation of a target echo and an interference radio frequency signal through digital-to-analog conversion and built-in up-conversion, and finally radiate the target echo and the interference radio frequency signal through a microwave antenna; the method can provide signal input for a semi-physical simulation experiment of the introduced equipment, flexibly set target echo and interference parameters, etc., can be applied to the semi-physical simulation experiment of the equipment, comprehensively examine the performance of the introduced equipment, effectively avoid the limitation of local testing, and greatly reduce cost consumption compared with real field testing.

Description

Technical Field

[0001] The invention relates to the field of aviation electronics technology, in particular to a target simulation method for introducing radar equipment into an active guidance system. Background Art

[0002] In the performance test and use process of a certain imported equipment, simulation test for its system is an important link. The existing test system for the imported equipment is mainly used to test the performance indicators of each component of the imported equipment. The target simulation involved is limited to the local mode and the target interference is relatively simple; during the test, the parameters related to the target interference can only be set to fixed values ​​or change according to a certain rule, and cannot be automatically modified. In addition, real field testing requires a lot of manpower and material resources, the cost is high, and it is necessary to pay attention to the disadvantages of uncertainty caused by factors such as weather environment, which greatly limits the use and performance verification of the radar equipment introduced for the active guidance system. Summary of the invention

[0003] The purpose of the present invention is to provide a target simulation method for an imported radar equipment with an active guidance system. The target simulation method can simulate the target echo and interference environment required for testing the imported radar equipment in a laboratory environment. The method adopts a combination of software and hardware, and the host computer software and FPGA can be used to conveniently set the target echo and interference parameters. The method has high reliability and low cost.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] A target simulation method for introducing radar equipment into an active guidance system comprises the following steps:

[0006] S1. First, the hardware part of the target simulation method includes an up-conversion module and a target signal generator; the up-conversion module includes a power divider, a bandpass filter, an amplifier, a mixer and a frequency multiplier; the target signal generator includes a microwave link unit, a baseband processing unit, a display control unit and a structural unit; the input end of the up-conversion module is connected to the output signal of the imported equipment through a radio frequency line; the output end of the up-conversion module is connected to the input end of the target signal generator through a radio frequency line;

[0007] The up-conversion module separates the signal (including the intermediate frequency signal and the radio frequency signal) output by the imported equipment, and multiplies the radio frequency signal to form an echo pre-processing signal;

[0008] S2. Next, the echo preprocessing signal is down-converted. The FPGA generates a baseband signal corresponding to the imported equipment radar according to the echo preprocessing RF signal after down-conversion, and performs Doppler modulation and delay modulation on the baseband signal, and adds interference and clutter;

[0009] S3. Finally, the signal is up-converted through the built-in microwave up-conversion module to output two target simulated echo signals or one target echo signal and one interference signal.

[0010] Furthermore, the power divider of the up-conversion module is used to divide the output signal of the imported equipment into two paths; the amplifier is used to amplify the two signals after power division respectively; the mixer is used to mix the two amplified signals; and the multiplier is used to multiply the frequency of the radio frequency signal.

[0011] Furthermore, the bandpass filter in the up-conversion module is used to filter signals in different frequency bands; a total of four bandpass filters are used to filter signals in the X1-X2 frequency band, the F1-F2 frequency band, the W1-W2 frequency band, and the A1-A2 frequency band, respectively.

[0012] Furthermore, the main parameters of the up-conversion module are as follows:

[0013] RF input frequency: X1~X2;

[0014] IF input frequency: F1~F2;

[0015] Radio frequency test output frequency: A1~A2.

[0016] Furthermore, the working process of the up-conversion module is as follows:

[0017] The imported equipment outputs one signal, including an intermediate frequency signal and an RF signal. The signal is split into two signals by a power divider, and band-pass filtering is performed respectively. The intermediate frequency signal and the RF signal after band-pass filtering enter the amplifier respectively, and the two amplified signals enter the mixer for mixing. After filtering, the signal is frequency-multiplied and finally filtered by a band-pass filter to form an echo preprocessing signal; that is, the input of the up-conversion module is the output signal of the imported equipment, and the output of the up-conversion module is the echo preprocessing signal.

[0018] Furthermore, the microwave link unit is composed of a built-in microwave down-conversion module, a built-in microwave up-conversion module, and a built-in microwave frequency synthesis module, and realizes frequency conversion between radio frequency signals and intermediate frequency signals;

[0019] The function of the built-in microwave down-conversion module is to down-convert the radio frequency signal into an intermediate frequency signal, including three-stage down-conversion, which uses three independent local oscillator signals as inputs to perform three-stage down-conversion, converting the received radio frequency signal into an intermediate frequency signal, and also includes a low noise amplifier and automatic gain control to control the input radio frequency signal to obtain an intermediate frequency signal of the same power;

[0020] The function of the built-in microwave up-conversion module is to up-convert the intermediate frequency signal into a radio frequency signal, including three-stage up-conversion, using three independent local oscillator signals as inputs for three-stage up-conversion, converting the analog intermediate frequency signal into a target echo simulation signal, and controlling and adjusting the signal power to meet the radio frequency output power requirements required for the simulation;

[0021] The built-in microwave frequency synthesizer module adopts direct digital frequency synthesis technology to provide local oscillator signals for the up-conversion module and the down-conversion module, and provides clock synchronization signals for the baseband processing unit.

[0022] Furthermore, the baseband processing unit is composed of a high-speed AD daughter card, a high-speed DA daughter card, a signal processing board, and a storage daughter card. The baseband processing unit can realize baseband processing of the signal and generate a target echo signal and an interference signal;

[0023] The high-speed AD daughter card is an ADC module, which can perform analog-to-digital conversion on the analog intermediate frequency signal to obtain a digital intermediate frequency signal;

[0024] The high-speed DA daughter card is a DAC module, which can perform digital-to-analog conversion on the digital intermediate frequency signal to obtain an analog intermediate frequency signal;

[0025] The signal processing board can perform Doppler modulation, interference modulation, and amplitude modulation on the digital signal to generate a target echo signal and an interference signal;

[0026] The memory daughter card can provide a buffer for delaying the digital signal.

[0027] Furthermore, the display control unit is composed of a switch board, a single board computer, and an optical reflector card, and the display control unit can exchange data and perform overall control with other units of the target signal generator through a user interaction interface;

[0028] The switch board can provide an external serial port to support information exchange between boards;

[0029] The single board computer can be equipped with target signal generator software to perform human-computer interaction, configure working modes, parameters, etc., and thus control output signals;

[0030] The optical reflector card is used for optical fiber communication.

[0031] Furthermore, the structural unit is composed of a chassis, a backplane, and a power supply adopting a CPCI bus architecture, and the structural unit is used to provide a data exchange PCIE bus and power supply for each unit board.

[0032] Furthermore, the output of the microwave down-conversion module is connected to the output of the up-conversion module by a radio frequency line, the output of the built-in microwave down-conversion module is connected to the radio frequency input port of the baseband processing unit by a radio frequency line, the built-in microwave frequency synthesizer is connected to the built-in microwave up-conversion module and the built-in microwave down-conversion module by a radio frequency line, and the built-in microwave frequency synthesizer is connected to the baseband processing unit by a radio frequency line, the output of the baseband processing unit is connected to the input of the built-in microwave up-conversion module by a radio frequency line, and the output of the built-in microwave up-conversion module is connected to the horn antenna by a radio frequency line, so as to radiate the radio frequency signal. The display control unit single-board computer sends control instructions through the chassis backplane PCIE bus, transmits them to the switch board, and then the switch board forwards and controls the boards of the microwave link unit and the baseband unit through the backplane PCIE bus.

[0033] The beneficial effects of the present invention are as follows: the target simulation method of the active guidance system introduced radar equipment provided by the present invention mainly relies on two parts of hardware during specific use, namely, an up-conversion module and a target signal generator; the up-conversion module can realize the first-level processing of the output signal of the introduced equipment, and the target signal generator can realize the generation of target echo and interference signal in the intermediate frequency and digital domain, and realize the generation of target echo and interference radio frequency signal through digital-to-analog conversion and built-in up-conversion, and finally radiate it through the microwave antenna; the target simulation method provided by the present invention can provide signal input for the semi-physical simulation experiment of the introduced equipment under laboratory environment conditions, flexibly set the target echo, interference parameters, etc., and can be applied to the semi-physical simulation test of the equipment, comprehensively examine the performance of the introduced equipment, effectively avoid the limitations of local testing, and greatly reduce cost consumption compared with real field testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a principle diagram of a target simulation method for introducing an active guidance system into radar equipment provided by the present invention;

[0035] Figure 2 It is a block diagram of the working principle of the up-conversion module in the simulation method of the present invention;

[0036] Figure 3 It is a block diagram of the target signal generator in the simulation method of the present invention. DETAILED DESCRIPTION

[0037] Specific embodiment 1: The technical scheme of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention. It should be noted that: in the present invention, if there is no special description, all the embodiments and preferred implementation methods mentioned herein can be combined with each other to form a new technical scheme. In the present invention, if there is no special description, all the technical features and preferred features mentioned herein can be combined with each other to form a new technical scheme. The "scope" disclosed in the present invention is in the form of lower limit and upper limit, which can be one or more lower limits, and one or more upper limits respectively. In the present invention, unless otherwise specified, each reaction or operation step can be carried out sequentially or in sequence.

[0038] As the instruction manual Figure 1 As shown, in order to solve the problem that the simulation of the target in the imported equipment test system is limited to the local mode, the parameters related to the target interference are fixed and cannot be modified, and at the same time, a large amount of manpower and material resources are consumed in the real field test, and the cost is high, the present invention designs and provides a target simulation method for the imported radar equipment with an active guidance system. The target echo generation principle diagram of the imported radar equipment with the active guidance system is shown in the attached specification. Figure 1 As shown, first, the up-conversion module separates a signal (including an intermediate frequency signal and a radio frequency signal) output by the imported equipment, and multiplies the radio frequency signal to form an echo pre-processing signal; secondly, the echo pre-processing signal is down-converted, and the FPGA generates a baseband signal corresponding to the imported equipment radar according to the echo pre-processing radio frequency signal after down-conversion, and performs Doppler modulation and delay modulation on the baseband signal, and adds interference and clutter; finally, the signal is up-converted by the built-in microwave up-conversion module to output a target simulation signal; the main hardware parts of the target simulation method of the active guidance system imported radar equipment of the present invention are the up-conversion module and the target signal generator; the main components of the up-conversion module include: a power divider, a bandpass filter, an amplifier, a mixer, a multiplier, etc., as shown in the attached manual Figure 2As shown; the input end of the up-conversion module is connected to the output signal of the imported equipment through a radio frequency line; the power divider of the up-conversion module is used to divide the output signal of the imported equipment into two paths; the bandpass filter in the up-conversion module is used to filter signals in different frequency bands; wherein a total of four bandpass filters are used to filter the signals of the X1-X2 frequency band, the F1-F2 frequency band, the W1-W2 frequency band, and the A1-A2 frequency band respectively; the amplifier in the up-conversion module is used to amplify the two signals after power division respectively; the mixer in the up-conversion module is used to mix the two amplified signals; the frequency multiplier in the up-conversion module is used to multiply the frequency of the radio frequency signal; the output end of the up-conversion module is connected to the input end of the target signal generator through a radio frequency line;

[0039] The main parameters of the up-conversion module are:

[0040] 1) RF input frequency: X1~X2;

[0041] 2) IF input frequency: F1~F2;

[0042] 3) Radio frequency output: A1~A2;

[0043] The main working process of the up-conversion module in the target simulation method is as follows:

[0044] The imported equipment outputs a signal, including an intermediate frequency signal and an RF signal. The signal is split into two signals through a power divider, and bandpass filtering is performed on each signal. The intermediate frequency signal and RF signal after bandpass filtering enter the amplifier respectively. The two signals after amplification enter the mixer for mixing, and then after filtering, the signal is frequency-multiplied, and finally filtered through a bandpass filter to form an echo preprocessing signal. That is, the input of the up-conversion module is the output signal of the imported equipment, and the output of the up-conversion module is the echo preprocessing signal.

[0045] As the instruction manual Figure 3As shown, the main components of the target signal generator in the target simulation method include: a microwave link unit, a baseband processing unit, a display control unit, and a structural unit, wherein the microwave link unit is composed of a built-in microwave down-conversion module, a built-in microwave up-conversion module, and a built-in microwave frequency synthesis module to realize frequency conversion between radio frequency signals and intermediate frequency signals; the function of the built-in microwave down-conversion module is to down-convert the radio frequency signal into an intermediate frequency signal, including three-stage down-conversion, using three independent local oscillator signals as inputs for three-stage down-conversion, and converting the received radio frequency signal into an intermediate frequency signal, and also including a low noise amplifier and an automatic gain control The function of the built-in microwave up-conversion module is to up-convert the intermediate frequency signal into the radio frequency signal, including three-stage up-conversion, which uses three independent local oscillator signals as input for three-stage up-conversion, converts the analog intermediate frequency signal into the target echo analog signal, and controls and adjusts the signal power to meet the radio frequency output power requirements required for the simulation; it should be noted that the built-in microwave frequency synthesis module adopts direct digital frequency synthesis technology to provide local oscillator signals for the up-conversion module and the down-conversion module, and provides clock synchronization signals for the baseband processing unit; the baseband processing unit consists of a high-speed AD daughter card, The high-speed DA daughter card, signal processing board, and storage daughter card are used to realize baseband processing of signals and generate target echo signals, interference signals, etc. The high-speed AD daughter card is the ADC module, and its function is to perform analog-to-digital conversion on analog intermediate frequency signals to obtain digital intermediate frequency signals. The high-speed DA daughter card is the DAC module, and its function is to perform digital-to-analog conversion on digital intermediate frequency signals to obtain analog intermediate frequency signals. The function of the signal processing board is based on digital radio frequency memory (DRFM) technology and uses FPGA chips to perform Doppler modulation, interference modulation, amplitude modulation, etc. on digital signals to generate target echo signals, interference signals, etc. The function of the storage daughter card is Provides buffering for the delay of digital signals; the display control unit is composed of a switch board, a single-board computer, and an optical reflector card, and exchanges data and performs overall control with other units of the target signal generator through a user interaction interface; the function of the switch board is to provide an external serial port and support information interaction between boards; the function of the single-board computer is to carry the target signal generator software, perform human-computer interaction, configure the working mode, parameters, etc., and thus control the output signal; the function of the optical reflector card is to perform optical fiber communication; the structural unit is mainly composed of a chassis, a backplane, and a power supply using a CPCI bus architecture, which can provide a data interaction PCIE bus and power supply for each unit board;During installation, the connection relationship of each component of the target signal generator is as follows: Among them, the output of the built-in microwave down-conversion module and the up-conversion module are connected by RF lines, the output of the built-in microwave down-conversion module is connected to the RF input port of the baseband processing unit through RF lines, the built-in microwave frequency synthesizer is connected to the built-in microwave up-conversion module and the built-in microwave down-conversion module through RF lines, and the built-in microwave frequency synthesizer is connected to the baseband processing unit through RF lines, the output of the baseband processing unit is connected to the input of the built-in microwave up-conversion module through RF lines, and the output of the built-in microwave up-conversion module is connected to the horn antenna through RF lines, so as to radiate the RF signal. The display control unit single-board computer sends control instructions through the chassis backplane PCIE bus and transmits them to the switch board, and then the switch board forwards and controls the microwave link unit and the baseband unit board through the backplane PCIE bus. ;

[0046] In summary, the target simulation method of the active guidance system introduced radar equipment provided by the present invention can simulate the target echo and interference environment required for the test of the introduced radar equipment in a laboratory environment. At the same time, the target echo and interference parameters can be conveniently set by combining the host computer software and FPGA by adopting the method of combining software and hardware. The interval of sending data from the host computer to the FPGA can be controlled to be on the order of 1ms. The whole simulation method system has strong flexibility and real-time performance. At the same time, it does not need to consume a lot of manpower and material resources, and the cost is low. It can be applied to the semi-physical simulation test of the introduced equipment. The above is only the preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as the preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the profession can make some changes or modify the equivalent embodiment of equivalent changes by using the technical content disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still belongs to the scope of the technical solution of the present invention.

Claims

1. A target simulation method for introducing radar equipment into an active guidance system, characterized in that: The steps include: S1. First, the hardware part of the target simulation method includes an up-conversion module and a target signal generator; the up-conversion module includes a power divider, a bandpass filter, an amplifier, a mixer and a frequency multiplier; the target signal generator includes a microwave link unit, a baseband processing unit, a display control unit and a structural unit; the input end of the up-conversion module is connected to the output signal of the imported equipment through a radio frequency line; the output end of the up-conversion module is connected to the input end of the target signal generator through a radio frequency line; The up-conversion module separates the intermediate frequency signal and the radio frequency signal output by the imported equipment, and multiplies the radio frequency signal to form an echo pre-processing signal; S2. Next, the echo preprocessing signal is down-converted. The FPGA generates a baseband signal corresponding to the imported equipment radar according to the echo preprocessing RF signal after down-conversion, and performs Doppler modulation and delay modulation on the baseband signal, and adds interference and clutter; S3. Finally, the signal is up-converted through the built-in microwave up-conversion module to output two target simulated echo signals or one target echo signal and one interference signal; The power divider of the up-conversion module is used to divide the output signal of the imported equipment into two paths; the amplifier is used to amplify the two signals after the power division respectively; the mixer is used to mix the two amplified signals; the multiplier is used to multiply the frequency of the radio frequency signal; The bandpass filter in the up-conversion module is used for filtering signals in different frequency bands; a total of four bandpass filters are used to filter signals in the X1-X2 frequency band, the F1-F2 frequency band, the W1-W2 frequency band, and the A1-A2 frequency band respectively; The working process of the up-conversion module is as follows: The imported equipment outputs one signal, including an intermediate frequency signal and an RF signal. The signal is split into two signals by a power divider, and band-pass filtering is performed respectively. The intermediate frequency signal and the RF signal after band-pass filtering enter the amplifier respectively, and the two amplified signals enter the mixer for mixing. After filtering, the signal is frequency-multiplied and finally filtered by a band-pass filter to form an echo preprocessing signal; that is, the input of the up-conversion module is the output signal of the imported equipment, and the output of the up-conversion module is the echo preprocessing signal.

2. The target simulation method for introducing radar equipment into an active guidance system according to claim 1 is characterized in that: The main parameters of the up-conversion module are as follows: RF input frequency: X1~X2; IF input frequency: F1~F2; Radio frequency test output frequency: A1~A2.

3. The target simulation method for introducing radar equipment using an active guidance system according to claim 2 is characterized in that: The microwave link unit is composed of a built-in microwave down-conversion module, a built-in microwave up-conversion module, and a built-in microwave frequency synthesizer module, and realizes frequency conversion between radio frequency signals and intermediate frequency signals; The function of the built-in microwave down-conversion module is to down-convert the radio frequency signal into an intermediate frequency signal, including three-stage down-conversion, which uses three independent local oscillator signals as inputs to perform three-stage down-conversion, converting the received radio frequency signal into an intermediate frequency signal, and also includes a low noise amplifier and automatic gain control to control the input radio frequency signal to obtain an intermediate frequency signal of the same power; The function of the built-in microwave up-conversion module is to up-convert the intermediate frequency signal into a radio frequency signal, including three-stage up-conversion, using three independent local oscillator signals as inputs for three-stage up-conversion, converting the analog intermediate frequency signal into a target echo simulation signal, and controlling and adjusting the signal power to meet the radio frequency output power requirements required for the simulation; The built-in microwave frequency synthesizer module adopts direct digital frequency synthesis technology to provide local oscillator signals for the up-conversion module and the down-conversion module, and provides clock synchronization signals for the baseband processing unit.

4. The target simulation method for introducing radar equipment using an active guidance system according to claim 3 is characterized in that: The baseband processing unit is composed of a high-speed AD daughter card, a high-speed DA daughter card, a signal processing board, and a storage daughter card. The baseband processing unit can realize baseband processing of signals and generate target echo signals and interference signals; The high-speed AD daughter card is an ADC module, which can perform analog-to-digital conversion on the analog intermediate frequency signal to obtain a digital intermediate frequency signal; The high-speed DA daughter card is a DAC module, which can perform digital-to-analog conversion on the digital intermediate frequency signal to obtain an analog intermediate frequency signal; The signal processing board can perform Doppler modulation, interference modulation, and amplitude modulation on the digital signal to generate a target echo signal and an interference signal; The memory daughter card can provide buffering for the delay of digital signals.

5. The target simulation method for introducing radar equipment using an active guidance system according to claim 4 is characterized in that: The display control unit is composed of a switch board, a single board computer, and an optical reflector card. The display control unit can exchange data and perform overall control with other units of the target signal generator through a user interaction interface; The switch board can provide an external serial port to support information exchange between boards; The single board computer can be equipped with target signal generator software to perform human-computer interaction, configure working modes, parameters, etc., and thus control output signals; The optical reflector card is used for optical fiber communication.

6. The target simulation method for introducing radar equipment using an active guidance system according to claim 5 is characterized in that: The structural unit is composed of a chassis, a backplane, and a power supply adopting a CPCI bus architecture. The structural unit is used to provide a data exchange PCIE bus and power supply for each unit board.

7. The target simulation method for introducing radar equipment into an active guidance system according to claim 6 is characterized in that: The output of the microwave down-conversion module is connected to the output of the up-conversion module by a radio frequency line, the output of the built-in microwave down-conversion module is connected to the radio frequency input port of the baseband processing unit by a radio frequency line, the built-in microwave frequency synthesizer is connected to the built-in microwave up-conversion module and the built-in microwave down-conversion module by a radio frequency line, and the built-in microwave frequency synthesizer is connected to the baseband processing unit by a radio frequency line, the output of the baseband processing unit is connected to the input of the built-in microwave up-conversion module by a radio frequency line, and the output of the built-in microwave up-conversion module is connected to the horn antenna by a radio frequency line, so as to radiate the radio frequency signal; The display control unit single board computer sends control instructions through the chassis backplane PCIE bus and transmits them to the switch board, which then forwards and controls the boards of the microwave link unit and baseband unit through the backplane PCIE bus.

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