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A Method for Detection of Target Echo Signals in Random Frequency Hopping Repeating Frequency Agile 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: 2021-04-06
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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 perform phase compensation along the searched motion track, and simultaneously solve the problems of distance migration and pulse-to-pulse phase jitter

Method used

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  • A Method for Detection of Target Echo Signals in Random Frequency Hopping Repeating Frequency Agile Radar
  • A Method for Detection of Target Echo Signals in Random Frequency Hopping Repeating Frequency Agile Radar
  • A Method for Detection of Target Echo Signals in Random Frequency Hopping Repeating Frequency Agile Radar

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Embodiment

[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 target echo signals of random frequency-hopping and frequency-hopping and frequency-agile radar targets. The method performs focusing processing on search tracks before detection, can effectively solve the problem of blind speed side lobes, and reduce the false alarm rate of subsequent detection processing; By searching in the target motion parameter space, phase compensation is performed on the signal, and coherent accumulation is realized. This method can simultaneously solve the problems of distance migration and pulse-to-pulse phase jitter; when there is narrow-band active interference in the scene, the method of the present invention can still Realize the effective accumulation of target signal energy, so as to detect the target from the 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 random frequency hopping and repetition frequency agility radar. Background technique [0002] 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, and random frequency hopping signals and frequency-repeating agility signals 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 system is rel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41
CPCG01S7/411
Inventor 段越田静宁晨崔嵬王烽宇周俊伟张彪吴嗣亮
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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