Signal processing method and device of pulse Doppler radar and storage medium

Abstract

The invention discloses a signal processing method and device of apulse Doppler radar and a storage medium. The method comprises the steps of transmitting a pulse group in a circulating manner, wherein the pulse group comprises a plurality of transmission pulses with different frequency codes; receiving an echo signal returned in response to the pulse group; performing matched filtering on the echo signal in sequence by using a matched filter bank, and performing separation of different range ambiguity regions; performing range walk correction on each range ambiguity region by using a Keystone transformation method; traversing Doppler fuzzy numbers in a preset range to perform Doppler fuzzy number compensation; and according to the peak value of the coherent accumulation result after Doppler fuzzy number compensation, determining a corresponding Doppler fuzzy number, and completing Doppler ambiguity resolution. According to the method, range ambiguity and Doppler ambiguity can be solved at the same time under the condition that repetition frequency is not changed, coherent processing capacity of echo pulses in the whole residence time can be achieved, Doppler resolution is improved, more signal-to-noise ratio gains are brought, and distance measurement precision and speed measurement precision are improved.

Description

technical field [0001] The invention relates to the technical field of radar signal processing, in particular to a signal processing method, device and storage medium of a pulse Doppler radar. Background technique [0002] Pulse Doppler radar, such as airborne radar, new land-based radar and ship-borne radar, has excellent characteristics such as all-weather, all-weather, and strong penetration. It has a wide range of applications in civilian or military fields. However, using MPRF to detect targets may have two-dimensional ambiguity of range and Doppler at the same time. In the prior art, for range ambiguity, range search method, hybrid filter de-ambiguity, or inter-pulse phase encoding, pulse frequency Coding and other methods can mark the transmitted waveform sequence to solve the problem of distance ambiguity. In the matched filtering stage, the distance ambiguity area can be separated according to different pulse marks; If the pulses are used as a group of signals for...

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Problems solved by technology

However, there may be two-dimensional ambiguity of range and Doppler in the detection of targets by using MPRF. In the prior art, for range ambiguity, range search method, hybrid filter de-ambiguity, or inter-pulse phase encoding, pulse frequency Coding and other methods can mark the transmitted waveform sequence to solve the problem of distance ambiguity. In the matched filtering stage, the distance ambiguity area can be separated according to different pulse marks; pulses as a group of signals for range deambiguation, the equivalent pulse repetition frequency is reduced, thus increasing the Doppler ambiguity

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