Signal processing method and device for frequency-agile radar based on variable repetition frequency technology

Abstract

The invention provides a signal processing method and device for frequency-agile radar based on a variable repetition frequency technology. The method includes the following steps: designing a frequency point sequence of random hopping according to a random number and the carrier frequency related parameters of radar, and designing a pulse time interval sequence according to the frequency point sequence and the distance range of a target to be detected; emitting a radar pulse signal according to the designed frequency point sequence and the designed pulse time interval sequence, receiving an echo signal of the radar pulse signal, and sampling and preprocessing the echo signal to obtain a baseband echo sampling signal; processing the baseband echo sampling signal by a single pulse to obtaina time-domain echo signal after pulse compression; and coherently accumulating the time-domain echo signal after pulse compression in the two dimensions of frequency point and pulse number, and obtaining the fine resolution distance and Doppler velocity values of the target to be detected through threshold decision. Accurate detection of the distance and velocity of a moving target by coherent frequency-agile radar is realized, and the amount of computation for the processing of coherent frequency-agile signals can be reduced.

Description

technical field [0001] The present invention relates to the technical field of radar signal processing, and more specifically, to a frequency-agile radar signal processing method and device based on variable repetition frequency technology. Background technique [0002] Pulse-to-pulse coherent frequency-agile radar not only realizes the rapid change of radar operating frequency between pulses, but also can effectively obtain the phase information of the echo signal. Pulse-agile frequency coherent radar not only has excellent anti-reconnaissance and anti-jamming capabilities, but also can realize moving target processing and high-resolution imaging through coherent accumulation, which has great application prospects. [0003] When the traditional moving target processing method obtains the speed information of the moving target, it must measure the phase change value of the echo signal of the target at different speeds relative to the transmitted signal, and the phase of the ...

AI Technical Summary

Problems solved by technology

None of the above methods can effectively perform coherent accumulation of pulse-agile frequency radar signals to achieve high-precision detection of the distance and speed of moving targets

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