Method of compensating motion error of multi-aperture synthetic aperture sonar

Abstract

The invention provides a method of compensating motion error of a multi-aperture synthetic aperture sonar. The method carries out average processing on independent echo data measurement at each time, common motion error information is extracted, and sway error of the multi-aperture synthetic aperture sonar can further be estimated. The method of the invention can estimate the sway error of the multi-aperture synthetic aperture sonar with a small amount of calculation, and thus, the focusing quality of the multi-aperture synthetic aperture sonar image is further improved.

Description

technical field [0001] The invention belongs to the field of signal processing, and in particular relates to a motion error compensation method of a multi-subarray synthetic aperture sonar. Background technique [0002] The image reconstruction of synthetic aperture sonar is based on the receiving and emitting path difference obtained from the geometric relationship between multiple pulse signals. have a noticeable impact on image quality. In practical applications, natural environmental factors such as wind, waves, swells, and human factors such as ship maneuverability can cause the sonar carrier to deviate from the ideal track; not only that, but also factors such as time and space fluctuations and multipath effects of the underwater acoustic medium. This will result in poor focus of the sonar image. Therefore, for a high-resolution synthetic aperture sonar system, it is necessary to accurately estimate and compensate the sonar motion error that deviates from the ideal t...

AI Technical Summary

Problems solved by technology

Generally speaking, navigation equipment can provide accurate rotation information of sonar systems such as yaw and roll, and can also provide robust acceleration information in the direction of roll and heading; but high-precision navigation equipment is expensive, while low-cost navigation equipment The equipment cannot meet the sub-wavelength accuracy requirements required by the high-resolution SAS system, making the motion compensation method based on navigation equipment very uneconomical and practical

The second method has a large amount of calculation and poor real-time performance, and is generally suitable for image post-processing.

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