A Block Synthetic Aperture Sonar Image Processing Method

Abstract

The present invention belongs to the synthetic aperture sonar image processing and splicing field and relates to a synthetic aperture sonar echo block processing and image splicing method. The method comprises the following steps that: (1) the operating parameters of a system are set; (2) the volume of single-block processing original sonar echo data is calculated, and an initial echo storage space is distributed; (3) a carrier velocity corresponding to a current data block is calculated according to sensor data; (4) a point-by-point or line-by-line synthetic aperture imaging algorithm is adopted to complete the imaging of the current data block; and (5) the overlapping portions of adjacent synthetic aperture imaging data blocks are removed, so that the seamless splicing of the adjacent data blocks is realized. According to the synthetic aperture sonar echo block processing and image splicing method of the invention, the velocity change characteristics of the motion of a carrier platform are fully considered; as for different data blocks, different velocities are adopted to perform synthetic aperture imaging, so that high-resolution imaging can be realized; the seamless splicing of different imaging data blocks is realized; and therefore, subsequent synthetic aperture sonar image processing and target recognition can be benefitted.

Description

technical field [0001] The invention belongs to the field of synthetic aperture sonar image processing, in particular to a block synthetic aperture sonar image processing method. Background technique [0002] Synthetic Aperture Sonar (SAS) is a high-resolution imaging sonar, which has the advantage that the imaging resolution is independent of the imaging distance and operating frequency, and can greatly improve the ability to detect small underwater targets. [0003] The premise of high-resolution synthetic aperture sonar imaging is that the carrier must meet the condition of uniform linear motion. Uniform linear motion is a prerequisite for ensuring the stability of platform motion. Although the stability of platform motion can be improved by optimizing the carrier design, it is still It is impossible to achieve the ideal state of uniform linear motion. In addition, in order to improve the imaging efficiency of synthetic aperture sonar, a line-by-line algorithm is usually...

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a synthetic aperture sonar image processing method, which can solve the problem of seamless splicing between adjacent data blocks in the synthetic aperture sonar resolution imaging process

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