摘要
在海洋重力测量中,厄特沃什(E tv s)改正误差一直是影响测量精度的主要误差源。对测量过程的分析可以发现,原始采集的重力值实际上是经过低通滤波后一段时间内的平均重力变化,而一般的E tv s改正方法计算所得的只是某一时刻的改正值,这种差异导致了重力数据精度的下降。针对这种情况,提出了合理的滤波E tv s改正方法,使改正值和重力值达到了完全对应。最后以L&R的S型海洋重力仪的测量数据为例,具体地说明了这种新方法的改正效果。
The Etvs effect is one of the most important error sources in marine gravity survey.By analyzing the survey process,we find the measured gravity filtered by low band pass filter is actually averaged over a time interval.However,Etvs correction is usually calculated at a time point.The difference between them decreases the accuracy of gravity data.To this question,the Etvs correction is improved to eliminate the difference in this paper.At last,an example of application is presented by analyzing gravity data obtained from LaCoste&Romberg S model gravimeter and the technique is proved to be successful in improving (data's) accuracy.
出处
《海洋测绘》
2005年第2期17-20,共4页
Hydrographic Surveying and Charting
