A synthetic aperture imaging sonar slant range non-uniform segmentation compensation method and system

Abstract

The invention belongs to the technical field of imaging sonar signal processing, and in particular relates to a synthetic aperture imaging sonar slant range non-uniform segmentation compensation method, the method comprising: acquiring the ground range echo received by the synthetic aperture sonar in the entire large survey zone data; divide the acquired echo data into N segments evenly along the ground distance direction, and obtain the echo data of each non-uniform sub-segment in the slope distance direction through the ground distance direction slant distance mapping; according to the sway error and heave error, Calculate the sound path difference of the non-uniform sub-section in each slant distance direction; based on the obtained sound path difference of the non-uniform sub-section in each slant distance direction and the echo data of the non-uniform sub-section in the slant distance direction, for N Motion compensation is performed on the echo data of the non-uniform sub-segment in the slant range direction, so as to realize the motion compensation of the received echo data in the range direction in the entire survey zone.

Description

technical field [0001] The invention belongs to the technical field of imaging sonar signal processing, and in particular relates to a method and system for compensating non-uniform segments in the oblique range direction of synthetic aperture imaging sonar. Background technique [0002] Synthetic aperture sonar synthesizes a virtual large aperture by moving the small-aperture array along the azimuth direction, and then performs coherent superposition processing on the received echoes at different positions according to the spatial position and phase relationship to obtain high-resolution images. Synthetic aperture sonar has strict requirements on the state of motion. To achieve high-resolution imaging, ideal uniform linear motion is required. [0003] However, in the actual field environment, affected by factors such as sea waves, undercurrents, and the mother ship, synthetic aperture sonar will inevitably produce motion errors, which will cause changes in the amplitude and...

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Problems solved by technology

[0005] The object of the present invention is, in order to solve the above-mentioned defect that existing motion compensation method exists, the present invention proposes a kind of synthetic aperture imaging sonar oblique distance direction non-uniform segmentation compensation method, this method is based on large surveying swath; overcomes large surveying and mapping The sound path difference caused by the motion error of the synthetic aperture sonar has the problem of spatial variability in the slant range direction. By segmenting the echo data uniformly along the ground range direction and using the range compression effect, multiple non-uniform sub-segments in the slant range direction are obtained. , conforming to the space change law of "first fast and then slow" of sound path difference caused by motion error, to achieve more accurate motion compensation

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