论旁侧声纳图像镶嵌技术

TECHNIQUES FOR SIDE SCAN SONAR IMAGE MOSAICKING

本文介绍了新一代旁侧声纳系统的技术性能;论述了关于海底声纳图像的镶嵌方法;讨论了影响声纳镶嵌图质量的若干问题;还通过区域性海底地貌研究,局部场地调查,搜寻海底目标等实际例证来阐明声纳镶嵌图的广泛用途。

The exploration and development of the offshore mineral resources make it necessary to conduct detailed seafloor mapping of potential areas and/or specific sites. The sophisticated microcomputerized side scan sonar system is an effective tool for seafloor mapping. Sonar mosaics, composed of numerous adjacent sonographs, visually reveal continuous high resolution spatial context of the seafloor in a large area, locate and identify the geohazards and constraints. Side scan sonar data provide the basic geological information for the safety of various offshore activities, e.g. platform installation and pipeline laying. Sonar mosaics can also be extensively applied to regional geomorphological studies, marine archeaology assessment and searching for submerged objects and wrecks.This paper describes the advanced technical properties of the up-to-date side scan sonar system and the principles of signal amplitude correction, slant range correction and speed correction. The methods and techniques for sonar image mosaicking are expounded in detail. The problems that affect the quality of sonar mosaics are discussed in the following aspects: (1) discontinuity of sonar signal; (2) error of input speed; (3) anomalous operational state of tow-fish; and (4) survey condition restraints. Suggestions for achieving optimum side scan sonar survey results are brought forward.