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Method for detecting target echo signal of random-frequency hopping-frequency agility radar

A technology of echo signal and radar target, which is applied in the field of random frequency hopping repetition frequency agile radar target echo signal detection

Active Publication Date: 2019-04-12
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Application Information

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Problems solved by technology

[0003] In view of this, the purpose of the present invention is to provide a random frequency hopping repetition frequency agile radar target echo signal detection method, which can carry out phase compensation along the motion track of the search, and simultaneously solve the problems of distance migration and pulse-to-pulse phase jitter

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  • Method for detecting target echo signal of random-frequency hopping-frequency agility radar
  • Method for detecting target echo signal of random-frequency hopping-frequency agility radar
  • Method for detecting target echo signal of random-frequency hopping-frequency agility radar

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[0055] In this example, the radar system simulation parameters are as follows: carrier frequency f c =2.5GHz, pulse width T p =10μs, frequency interval Δf=50kHz, number of frequency hopping points M=512, sampling frequency f s =15MHz, average pulse repetition frequency PRF=500Hz, coherent accumulation pulse number N=1024. The simulation target position and motion parameters are as follows: initial radial distance R 0 = 24km, radial velocity v 0 =680m / s, the original signal-to-noise ratio of the target echo received by the radar is SNR=-20dB.

[0056] Step 1, firstly perform pulse pressure processing on the received signal;

[0057] Step 2. Determine the search interval of distance and radial velocity respectively:

[0058] Δr=c / (2f s )=10m represents the distance search interval, where f s is the sampling frequency; Δv=c / (2f c NT)=0.029m / s represents the radial velocity search interval.

[0059] Step 3, determine the search trajectory of the moving target according to...

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Abstract

The invention discloses a method for detecting a target echo signal of a random-frequency hopping-frequency agility radar. According to the method for detecting the target echo signal of the random-frequency hopping-frequency agility radar, focusing treatment before detection is carried out on a search trajectory, the blind velocity sidelobe problem can be effectively solved, and the false alarm rate of subsequent detection treatment is reduced; by searching in a target motion parameter space, the signal is subjected to phase compensation to realize coherent accumulation, and the method can solve the problems of range migration and inter-pulse phase jitter at the same time; and when narrow source interference exists in a scene, the method can still realize the effective accumulation of thetarget signal energy, so that a target is detected from an interference background.

Description

technical field [0001] The invention belongs to the technical field of radar measurement, and in particular relates to a method for detecting target echo signals of a random frequency hopping and repetition frequency agile radar. Background technique [0002] The anti-jamming performance is the key to ensure the battlefield survivability of the radar system, improve the combat level and obtain the initiative in war. Random agility is an effective design measure to obtain anti-jamming capability through the design of transmission waveforms, among which random frequency hopping signal and repeated frequency agility signal are two important random agility signals. Repetition-agile radar can solve the ambiguity problem of low-repetition pulse Doppler radar speed measurement by superimposing random jitter on the uniform pulse repetition interval, and has good anti-intercept and anti-electronic interference performance. However, the speed ambiguity resolution ability of this syst...

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/411
Inventor 田静宁晨崔嵬王烽宇周俊伟张彪段越吴嗣亮
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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