海洋重力测量中的厄特弗斯效应分析

Analysis of Etvs Effect in Marine Gravity Measurements

在动态重力测量中,必然产生厄特弗斯效应,而且厄特弗斯效应无法通过改进仪器和增加附属设备来消除,只能通过相应的数据处理加以改正。通过对厄特弗斯效应影响因素的分析,表明纬度误差影响较小,而航向误差、速度误差影响较大,而且各参数误差随着船的航向不同而有差异:当测量船沿着东西方向航行时,测量船航速误差影响较大,而航向误差影响较小;当测量船沿着南北方向航行时,航向误差影响较大,而航速误差影响较小。通过实测重力数据处理,对比厄特弗斯改正前后的重力空间异常,表明厄特弗斯效应影响较大,是动态重力测量中的所有改正项中较大的一项。

The Eotvos effect will be inevitably produced in dynamic gravity measurements and can only be corrected by data processing rather than be eliminated through equipment improvement or addition of ancillary equipment. Analysis shows that the Eotvos effect has a little impact on latitude errors and a bigger impact on course and speed errors and that various parameter errors vary with the ship＇s course. If the course of the survey ship is east-west, the Eotvos effect has a major impact on its speed error and a smaller impact on its course error. If the course of the survey ship is south-north, the Eotvos effect has a great impact on its course error and a little impact on its speed error. A comparison between gravity a- nomalies before and after the Eotvos correction through gravity data measurements shows that the EtitvSs effect has a great impact and is a major correction in dynamic gravity measurements.