Coherent processing method suitable for carrier frequency and repetition frequency combined agile radar

Abstract

The invention provides a coherent processing method suitable for a carrier frequency and repetition frequency combined agile radar. Coherent processing of the carrier frequency and repetition frequency combined agile radar can be achieved with low operation complexity. Comprising the following steps: establishing an echo model of a target, and carrying out matched filtering on a received signal according to the echo model to obtain a matched filtering result of a carrier frequency and repetition frequency combined agile radar receiving echo; performing frequency inversion transformation on the matched filtering result, eliminating frequency hopping phase information, performing RFT coarse processing based on CZT on the transformed result, and preliminarily obtaining distance and speed information of the target; according to the distance information and the speed information, differential evolution processing is carried out in the two distance intervals, and accurate target distance information, accurate target speed information and accurate target acceleration information are obtained.

Description

technical field [0001] The invention belongs to the field of radar signal processing, and in particular relates to a coherent processing method suitable for carrier-frequency-repeat-frequency joint agility radar. Background technique [0002] Waveform agile radar refers to the radar whose carrier frequency, repetition frequency, intra-pulse code and other parameters are agile simultaneously. The radar with only the pulse carrier frequency as the agile variable is called frequency agile (Frequency Agile). , FA) radar, the radar whose pulse transmission interval changes randomly is called random pulse repetition interval (Random Pulse Repetition Interval, RPRI) radar or repetition frequency agility radar. The carrier frequency and pulse repetition frequency are randomly and agilely changed within a certain range at the same time. [0003] In terms of interpulse carrier frequency agile radar coherent processing research, in 2014, Wang Dinghe et al. based on the literature "Rad...

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Problems solved by technology

In 2014, the matched filter used in the document "Long time coherent integration method for frequency agile radar" is the filter with the best output under low-speed target conditions, but high-speed targets will cause gain loss due to mismatch problems

At present, there are relatively few research literatures on the rapid implementation of the coherent processing algorithm of the carrier frequency repetition frequency random agile radar, but the above two types of methods are of reference value. If the random

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