Broadband radar target simulation method and system

Abstract

The present invention relates to a broadband radar target simulation method and system, characterized in that: the received radar radiation signal enters the broadband down-converter of the simulation system through an attenuator and a low-noise amplifier to perform conversion from radio frequency to intermediate frequency, and the down-conversion output IF 70MHz band-pass signal, 70MHz IF modulation signal is low-pass filtered and then band-pass samples the input analog modulation signal, and the output digital data is digitally down-converted in the FPGA, demodulated to the digital baseband signal and delayed; the delayed The data is output to the IQ data processing circuit of the FPGA, and finally the target simulation in the microwave frequency band is radiated to the radar through the signal output by the DAC. The invention adopts space coherent reception, which can fully meet the requirements of radar far-field testing.

Description

technical field [0001] The invention belongs to the technical field of radio frequency simulation, and in particular relates to a wideband radar target simulation method and system for radio frequency radar target simulation, which are mainly used for functional testing, calibration and debugging of air defense radar systems in field environments and laboratory conditions. Background technique [0002] The radar target simulator is the product of the combination of system simulation technology and radar technology. It simulates the target and environment of the radar, and the simulation result is the radio frequency signal including the target and the environment. Radar target simulators are widely used in the testing, calibration and debugging of radar systems. The use of radar target simulation technology for functional testing of radar systems can greatly save field test expenses, effectively speed up radar development and production time, and shorten the radar developmen...

AI Technical Summary

Problems solved by technology

Only the distance of the target can be simulated statically, but the amplitude and Doppler frequency of the target cannot be simulated

[0005] 2. "Research on FPGA-Based Millimeter-Wave Multi-target Signal Formation Technology" published in "Application of Electronic Technology" (by Xu Man, Su Guangzhou) used DSP and FPGA technology to statically simulate multiple targets; using D / A to convert into video The analog signal is then orthogonally modulated to the intermediate frequency signal. Due to the use of D / A converter technology, the system lacks waveform versatility, that is, it can only target specific radar waveforms and does not have generalization characteristics.

[0006] 3. "Design and Implementation of Radiative Radar Multi-target Simulator Transmitter" published in "Modern Radar" (Zhao Fei, Qi Huiying, etc.) uses DRFM technology to simulate radar targets, but the working frequency band covered is L / S / X, does not have broadband characteristics

[0012] ① Existing test equipment cannot complete the search-to-track function test;

[0013] ② Existing test equipment cannot dynamically simulate radar target echo characteristics in real time;

[0014] ③Existing test equipment can only test the receiving branch, and cannot complete the comprehensive dynamic simulation and testing of the whole system from the transmitter→transmitting antenna→target→receiving antenna→receiver→signal processing→data processing→terminal display and control;

[0015] ④ Existing test equipment has problems such as many connections, difficulty in coherence, and easy interference of emission trigger signals when performing target simulation tests;

[0016] ⑤ The foreign advanced radar target simulation system has problems such as high price, huge size, poor portability, and complicated operation, and cannot meet the domestic radar testing needs

Images