A Real-time Imaging Method of Synthetic Aperture Sonar

Abstract

The invention discloses a synthetic aperture sonar real-time imaging method. The invention does not need to construct a delay table in advance. By simplifying the delay solution structure and adopting a processing method of segment addressing and participating in virtual aperture synthesis, the complexity and Cache consumption speeds up the calculation speed and can complete imaging in real time. The invention adopts aperture processing in batches, data collection and algorithm processing are carried out synchronously, the imaging process does not need to store all echo data, reduces hardware overhead, and improves algorithm operation efficiency. The technology of the present invention has scalability, that is, according to actual needs, the delay index calculation can be processed in parallel in a modular manner, and the calculation speed can be further accelerated.

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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