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Radar signal processing system based on DRFM (Digital Radio-Frequency Memory) technology and dense target jamming generation method

A radar signal processing and dense target technology, applied in the field of high-performance radar signal processing system and dense target interference pattern generation, can solve the problems of sampling period limitation, sub-false target number and quality influence, etc., and achieve high Doppler frequency resolution power, increasing hardware complexity, and optimizing interference performance

Active Publication Date: 2016-06-01
NANJING UNIV OF SCI & TECH
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Problems solved by technology

Intermittent sampling and direct forwarding are limited by the sampling period, and the number and quality of secondary false targets are also affected

Method used

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  • Radar signal processing system based on DRFM (Digital Radio-Frequency Memory) technology and dense target jamming generation method
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  • Radar signal processing system based on DRFM (Digital Radio-Frequency Memory) technology and dense target jamming generation method

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Embodiment Construction

[0021] The radar signal processing system of the present invention is composed of a transceiver unit and a signal acquisition and processing unit, wherein the radar signal acquisition and processing system based on digital radio frequency storage technology includes a broadband digital radio frequency memory based on high-speed ADC / DAC+FPGA+ARM architecture, and a signal based on FPGA processor, all-digital SSB modulator, and FPGA-based timing controller. The broadband digital radio frequency memory completes the high-speed sampling and storage of received intermediate frequency signals; the FPGA-based signal processor performs delay and superposition processing on the stored data according to the density parameters of dense targets, and generates dense target echo signals covering the radar detection range; The digital SSB modulator performs Doppler frequency shift on the delayed and superimposed dense target echo signal to simulate the moving speed and direction of the target...

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Abstract

The invention discloses a radar signal processing system based on DRFM (Digital Radio-Frequency Memory) technology and a dense target jamming generation method. A transmitting and receiving antenna receives a radar transmitting pulse, and an L-waveband microwave transmitting and receiving assembly carries out down conversion processing on a radar signal; a wideband digital radio frequency memory in a signal processing unit receives an intermediate frequency signal, and high-speed sampling and memory are carried out; an FPGA-based signal processor carries out piecewise superposition on the stored data, and an analog echo signal covering a radar detection distance range is generated; an all-digital single-sideband modulator carries out Doppler frequency shift on the echo signal; and an FPGA-based timing controller converts the echo signal through frequency shift into an intermediate frequency output signal. Delayed superposition forwarding increases the number and the density of false targets, dense target jamming approximate to noise can be realized, and functions of the DRFM, control and management and the like can be effectively realized.

Description

technical field [0001] The invention relates to the field of radar electronic countermeasures, in particular to a high-performance radar signal processing system designed for simulating complex radar electromagnetic environments and a method for generating dense target interference patterns. Background technique [0002] In the field of modern electronic countermeasures, compared with broadband noise suppression jamming and other spoofing jamming patterns, coherent jamming signals can accurately imitate radar transmission signal waveforms, obtain the same coherent processing gain as real target echoes, and have better jamming performance. At the same time, with the rapid development of high-speed signal acquisition, VLSI, high-speed signal processing and other technologies, especially the continuous development of digital radio-frequency memory technology (Digital Radio-Frequency Memory, DRFM), it provides a hardware foundation and Technical Support. When using DRFM technol...

Claims

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Application Information

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IPC IPC(8): G01S7/38
CPCG01S7/38
Inventor 蔡雨琦鲍昱蒙孙红磊施镇峰袁美娟蒋芸茹谢仁宏芮义斌李鹏郭山红
Owner NANJING UNIV OF SCI & TECH
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