Cross-distance-unit and cross-Doppler-unit quick coherent accumulation detection method for radar maneuvering target

Abstract

The invention relates to a cross-distance-unit and cross-Doppler-unit quick coherent accumulation detection method for a radar maneuvering target, and belongs to the technical field of radar signal processing and detection. The method comprises the following steps that: firstly, carrying out a time reversal operation on slow time dimension data after radar pulse pressure, eliminating a phase odd-order item, and utilizing second-order matching Fourier transform to estimate a second-order phase parameter; secondly, carrying out quick time dimension Fourier transform and second-order phase compensation; thirdly, carrying out a slow time dimension phase difference order reduction operation, and carrying out second-order Keystone transform; and finally, carrying out distance frequency dimensioninverse Fourier transform and slow time Fourier transform to finish cross-unit coherent accumulation, and constructing detection statistical magnitude to carry out maneuvering target detection. By use of the method, the cross-distance-unit and cross-Doppler-unit energy coherent accumulation of the maneuvering target can be realized, and an accumulation gain is high. Meanwhile, the method is a nonparametric search method which is high in operation efficiency and is suitable for engineering application. Through a peak value, the motion parameters of the target can be estimated, and the detection and estimation ability of the radar maneuvering target can be improved.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing and detection. More specifically, the invention relates to a rapid coherent accumulation detection method of a radar maneuvering target across a distance and a Doppler unit, which can be used for rapid detection and estimation of a radar maneuvering target. Background technique [0002] Robust and effective radar moving target detection is always a difficult problem in the field of radar signal processing, and it is of great significance to study signal processing methods to improve the ability of radar to detect weak moving targets. In recent years, with the development of target equipment, high-speed and high-mobility targets have emerged in an endless stream, which poses a great threat to radar and increases the difficulty of radar detection targets, such as hypersonic aircraft, high-mobility missiles, fighter jets, drones, and surface speedboats. . Since the echo of a maneuver...

AI Technical Summary

Problems solved by technology

At the same time, high maneuvering targets are also prone to cross-range and Doppler unit walking problems, which makes the target energy dispersed in the time domain and frequency domain, reducing the coherent accumulation gain

[0003] At present, the main technical approaches in this field are as follows: First, the distance walking compensation method based on Keystone transformation, which performs scale transformation on the original coordinate axis through interpolation, thereby effectively correcting the distance migration, which can only compensate for the first-order distance walking, That is, cross-unit walking caused by uniform motion, and Doppler walking cannot be compensated; the second is the path search matching accumulation method, such as Radon-Fourier transform and Radon-fractional Fourier transform, determined by pre-setting the motion parameters Motion trajectory, on which coherent accumulation of signals can compensate for distance and Doppler movement at the same time, but this method requires high-dimensional parameter search. For high-order maneuvering targets, there are many parameters to be searched, and the calculation amount is very large

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