InSAS干涉测深系统误差分析

The bathymetric error of interferometric synthetic aperture sonar

对由海水折射引起的InSAS干涉测深误差进行了分析。在分析InSAS测深原理的基础上,采用射线声学理论分析了两种典型的中国海浅海声速剖面条件下,距离深度比对测深精度的影响。结果表明,对于典型的中国海浅海声速剖面,在水深为40m的情况下,当距离深度比达到5～10倍时,InSAS干涉测深系统将带来5～20m的深度测量误差和1～3m的水平距离误差。因此,为提高InSAS干涉测深系统精度,必须要进行声速补偿。

The bathymetric error of interferometric synthetic aperture sonar（InSAS） caused by sound transmission bending is analyzed in this paper.Based on the principle of the interferometric synthetic aperture sonar, the effect of range to depth ratio on the bathymetric accuracy is studied for two typical sound profiles in China shallow sea by ray acoustics.The results indicate that when the depth of water is 40m and the ratio of range to depth is between 5 and 10, an INSAS may bring 5 to 20m depth error and 1 to 3m horizon distance error.Therefore the compensation of sound ve-locity is necessary to improve the InSAS bathymetric accuracy.