CNSVPGets软件获取声速剖面精度分析

提出最大差、中误差和全程平均差作为声速剖面曲线比较的精度指标。使用CNSVPGets软件对218条实测声速剖面曲线与软件获取剖面曲线进行对比计算,统计了比对曲线的最大水深、最大差、中误差、全程平均差;全部对比曲线的平均水深为1231.36m,平均最大差为6.74m/s,平均中误差为2.68m/s,全程平均差为1.72m/s。全程平均差小于5m/s的对比剖面对占95.4%,由此推论软件获取声速剖面的全程平均差极限误差为5m/s,中误差为2.5m/s;用软件获取声速剖面取代实测剖面用于水深测量计算,对测深精度的影响比海道测量规定的深度测量极限误差低1个数量级,因此可以使用软件获取声速剖面用于海道测量的深度测量声速改正。基于软件获取声速剖面的效率和重要性提出了建立和维护中国的全球声速剖面模型的建议。

Precision Analysis of CNSVPGets Soft Got SVPs

Max difference,RMS and entire journey Md.are proposed as precision indices of SVP curvecomparing.CNSVPGets soft is applied to comparing 21 8.measured SVP curves with corresponding soft got ones,and the max depth,max difference,RMS,entire journey Md.are counted.For all comparing SVP curves,theaverage depth value is 1231.4.m,the average max difference value is 6.7 4.m/ s,the average RMS value is 2.6 8.m/s,and the entire journey Md.value is 1.7 2.m/ s.The comparing SVPs whose entire journey Md.value are less than 5.m/ s,have the proportion of 95.4%,from which it is concluded that the limit error of the entire journey Md.ofthe soft got SVPs is 5.m/ s,and RMS is 2.5.m/ s.The result about the entire journey Md.value states that the softgot SVPs can replace the measured ones to be applied to the hydrographic sounding,and the impact on thesounding precision is lower than 1.order of the sounding limit error of hydrographic regulations,hence the softgot SVPs can be used in the hydrographic sounding for sound velocity corrections.Based on the efficiency andimportance of the soft got SVPs,the global SVP model of China should be created and maintained.