Real-time imaging method for synthetic aperture sonar

Abstract

The invention discloses a real-time imaging method for a synthetic aperture sonar. The method disclosed by the invention does not need to build a delay table in advance, complexity is reduced by simplifying a delay solving structure, adopting segmented addressing and participating in a virtual aperture synthesis processing mode, cache consumption is reduced, operating rate is increased, and imaging can be completed in real time. The method disclosed by the invention has the advantages that aperture processing is performed in batch, data acquisition and algorithm processing are synchronously performed, all the echo data is not stored in an imaging process any longer, hardware overhead is reduced, and algorithm operation efficiency is improved. The technology of the method disclosed by the invention has expandability, namely modular parallel processing can be performed on delay index calculation according to the actual needs, thus the operating rate is further increased.

Description

technical field [0001] The invention relates to the technical field of synthetic aperture sonar in underwater acoustic communication, in particular to a method for real-time imaging of synthetic aperture sonar. Background technique [0002] Synthetic aperture sonar (SAS) is a high-resolution underwater imaging sonar. Its principle is to use multiple small-sized arrays to move at a uniform speed in azimuth to virtualize large-sized apertures, thereby obtaining high-resolution images independent of distance. SAS is widely used in underwater environmental survey, shipwreck search and submarine pipeline survey and other fields. With the development of SAS imaging technology and the improvement of practical application requirements, the requirements for real-time processing of imaging systems are increasing. [0003] The core algorithm of the commonly used SAS beamforming is the delay sum imaging algorithm. According to the principle of spherical wave focusing, the algorithm cal...

AI Technical Summary

Problems solved by technology

Therefore, the currently commonly used SAS imaging processing method is: the sonar platform stores the collected echo data in advance, and then transmits them to the algorithm processor, and then the post-processing software in the algorithm processor generates the transmitted signal according to the designed operating parameters. The reference signal is used to perform range pulse compression on the echo data, and the imaging algorithm based on the delay table is used to complete the aperture synthesis processing, and finally the display and control host computer receives and displays the imaging data, which cannot meet the requirements of real-time imaging

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