未知声速分布下的一种水下目标GPS定位修正算法  

A modified algorithm of underwater GPS localization under unknowing sound speed profile

作　　者：李志伟[1] 杨益新[1] 

机构地区：[1]西北工业大学航海学院,西安710072

出　　处：《声学技术》2013年第5期362-367,共6页Technical Acoustics

基　　金：国家自然科学基金资助项目(10974153)

摘　　要：由于海洋中声速分布不均匀,要实现水下目标GPS的精确定位,必须进行误差修正。阐述了采用应答器工作模式的水下目标GPS系统定位原理,在水下目标GPS系统定位过程中,分析了一种基于欧氏几何原理的修正算法在声速分布未知时的定位修正效果和局限性,研究了算法出现盲区的原因,并据此对该算法进行了改进。仿真计算结果表明改进后的算法可有效减小声速分布未知时声速估计不准确造成的定位误差,提高了水下目标GPS的定位精度。Due to the maldistribution of the sound velocities in ocean, it is necessary to make error correction for accu-rate localization. In this paper, the positioning theory of underwater target GPS system with the transponder mode is stated. The error correction algorithm for target localization based on the Euclidean geometry is applied to the under-water target GPS system, which is suitable for the case of unknowing sound velocity distribution. The correction per-formance of the algorithm is analyzed, and the blind zone of correction is deduced. A modified version of the algorithm is proposed to deal with the blind zone problem. The simulations show that the modified algorithm can effectively reduce the localization error caused by nonuniform sound velocity distribution and the estimated sound velocity error, so that the underwater target GPS positioning accuracy can be improved.

关 键 词：GPS 水下定位 声速分布 修正算法 

分 类 号：TB556[理学—物理]