Novel multi-subarray synthetic aperture sonar fast imaging algorithm

Abstract

The invention provides a novel multi-subarray synthetic aperture sonar fast imaging algorithm. In accordance with a subsystem composed of a single receiving array element and a transmitting array element,two-dimensional frequency domain system function is calculated. Based on the characteristics that the azimuth focusing and the range direction processing are relatively independent, azimuth pulse-compression phase modulation function is calculated. Based on the phases of the two-dimensional frequency domain system function and the azimuth pulse-compression phase modulation function, the distance-azimuth coupling phase term is calculated. The subsystem echo data is made uniform correction process through coupling phase. The range direction data is partitioned. The differential correction of coupling phase is utilized to realize the participant range cell migration correction of the subsystem signal. The subsystem signal is performed azimuth pulse compression. After imaging and processing echo data of the subsystem composed of each receiving array element and the transmitting array element, all of coarse resolution images are performed coherence stack, so as to obtain the final high resolution image of the synthetic aperture sonar. The novel multi-subarray synthetic aperture sonar fast imaging algorithm has the advantages of overcoming the complex design process of the traditional imaging algorithm and improving the imaging performance of the imaging algorithm within the whole swath.

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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