A New Fast Imaging Algorithm for Multi-Subarray Synthetic Aperture Sonar

Abstract

The invention provides a new multi-subarray synthetic aperture sonar fast imaging algorithm, which calculates the two-dimensional frequency domain system function for the subsystem composed of a single receiving array element and transmitting array element; Independent features, calculate the azimuth pulse compression phase modulation function; calculate the range-azimuth coupling phase item based on the phase of the two-dimensional frequency domain system function and the azimuth pulse compression modulation function; perform coupling phase consistency correction processing on the echo data of the subsystem ; Data block in the range direction; Use the coupling phase difference correction to realize the participation range migration correction of the subsystem signal; Perform azimuth pulse compression on the subsystem signal; Echo of the subsystem composed of each receiving array element and transmitting array element After the data is imaged and processed, all coarse-resolution images are coherently superimposed to obtain the final synthetic aperture sonar high-resolution image, which overcomes the complex design process of traditional imaging algorithms and improves the imaging performance of imaging algorithms in the entire survey zone.

Description

technical field [0001] The invention belongs to the field of signal processing, in particular to a new multi-subarray synthetic aperture sonar fast imaging algorithm. Background technique [0002] Synthetic aperture sonar technology relies on the uniform linear motion of small-sized primitives to virtually synthesize a large-aperture array whose length is proportional to the detection distance. Through the coherent superposition of sampling signals at different positions in space, high-resolution azimuths that are independent of distance and frequency are obtained. It solves the problem that the imaging resolution of traditional side-scan sonar is restricted by factors such as the real aperture length of the base array, the signal frequency, and the operating distance, and improves the azimuth resolution of conventional side-scan sonar by 1 to 2 orders of magnitude. The adoption of sub-array technology has solved the contradiction between high-resolution in azimuth and dista...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the complex design process of the traditional imaging algorithm and improve the imaging performance of the imaging algorithm in the entire survey zone, and provide a multi-subarray synthetic aperture sonar high-resolution imaging algorithm suitable for wide survey zones

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