A Multi-subarray Synthetic Aperture Sonar Phase Error Analysis Method

Abstract

The invention provides a multi-subarray synthetic aperture sonar phase error analysis method, comprising the following steps: calculating the two-way slant distance history for each subsystem composed of a receiving array element and a transmitting array element; The phase dwell point is calculated based on the numerical analysis method for the subsystem composed of the transmitting array element and the receiving array element; for each subsystem composed of the receiving array element and the transmitting array element, the two-dimensional frequency domain System function; calculate the two-dimensional frequency domain system function of the model to be evaluated; for each subsystem composed of receiving array elements and transmitting array elements, according to the azimuth space-invariant and distance-space-variant characteristics of the multi-subarray synthetic aperture sonar, Set the target space coordinates; calculate the phase error in the two-dimensional frequency domain for each subsystem composed of the receiving array element and the transmitting array element, which overcomes the problems of long evaluation period of traditional imaging models or imaging algorithms and unintuitive numerical indicators.

Description

technical field [0001] The invention belongs to the field of signal processing, in particular to a phase error analysis method of a multi-subarray synthetic aperture sonar. 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. Rate. The adoption of multi-subarray technology has solved the contradiction between high resolution in azimuth and distance measurement, and made SAS technology start to move towards practical engineering. [0003] Imaging algorithm is the core technology of synthetic aperture sonar technology. At present, there are many geometric models of synthetic aperture sonar imaging at home and abroad. According to ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the traditional imaging model or imaging algorithm evaluation cycle is long, the numerical index is not intuitive enough, etc., to provide a multi-subarray synthetic aperture sonar phase error analysis method, and then according to the error analysis results of various models, there is Carry out research work on imaging algorithms in a targeted manner

Images