【摘要】 <正> 整理海洋重力测量资料时,很重要的是合理计算厄特维斯改正值。如果计算不当,使厄特维斯改正过头或不足,都不能达到海上测量的应有精度,同时会使重力异常造成畸变。 计算厄特维斯改正值,关键是要获得正确的船速和航迹方位角。在以前,有从定位图版上直接量取航速航向的,这在定位精度高的情况下还可以,在定位精度不高的情况下,往往会带来很大误差,再加上量图作业本身的误差,就有可能造成相邻测点航速航向,以及厄特维斯改正值的跳动。后来,根据海洋重力测量要求船只尽可能作匀速直线运动,对每条测线上更多还原

【Abstract】 It is important to calculate the Eotvos correction for the data of marine gravity accurately.If the calculation is inaccurate,we cannot obtain the due precision of the gravitymetre operating at the sea and anamorphosis of the gravity anomaly will occur.The crux of calculating the Eotvds correction depends upon the correct velocity and bearing of the ship.When the marine gravity survey is going on,we need the moving of the ship to keep a straight line,and the velocity of the ship should be constant,but they always change owing to the influences of wind and tidal current.We try to get the true approaching velocity and track of the ship by application of "spline function" to reproducing track lines.Based on the approach,requirements of the velocity and track of the ship,three objective functions and three methods of algorithm are given in this paper.In the gravity survey over an area about 170,000km2 of the East China Sea,we have used the second method and got a good result.更多还原