海洋重力测量中的重力基点读数改正新方法

A new method for correction of gravity base station readings in marine gravimetric survey

海洋重力测量中的重力基点读数改正是精准传递重力基点绝对重力值的基础,为精准传递重力基点绝对重力值和提高海洋重力测量精度,针对海洋重力测量技术规范中的海洋重力测量基点读数改正公式的不足,提出了精准度更高的海洋重力测量重力基点读数改正新方法,建立了重力基点读数改正新公式,新公式将海洋重力仪读数归算到重力基点在基准面的投影位置的同一纬度上,并做了中间水层改正、固体潮改正和重力仪与重力基点南北向距离引起的重力差校正,与海洋重力测量技术规范中的重力基点读数改正公式相比,新重力基点读数改正公式提高了重力基点绝对重力值传递的精准度,更适合用于重力基点读数改正,对提高海洋重力测量精度具有重要意义。

The correction of gravity base station readings in marine gravimetric survey is the basis of accurate transmission of the absolute gravity values at gravity base station.In order to allow accurate transmission of the absolute gravity values at gravity base station and improve the accuracy of marine gravimetric survey,this paper puts forward a new method for the correction of gravity base station readings in marine gravimetric survey with higher accuracy,and establishes a new correction formula of gravity base station readings in terms of the deficiency of the correction formula of gravity base station readings in the technical specifications for marine gravimetric survey.This new formula resets the readings of marine gravimeter to the same latitude of the projection position of gravity base station on the base level,and makes the correction of intermediate water layer,earth tide correction and the gravity difference correction caused by the distance between gravimeter and gravity base station in the north-south direction.Compared with the correction formula of gravity base station readings in the technical specifications for marine gravimetric survey,the new correction formula of gravity base station readings improves the transmission accuracy of absolute gravity values at gravity base station,which is more appropriate for the correction of gravity base station readings,and is of great significance to improve the accuracy of marine gravimetric survey.