海域航空重力测量数据向下延拓的实用方法

Practical Methods for the Downward Continuation of Airborne Gravity Data in the Sea Area

针对航空重力测量向下延拓过程固有的不确定性,根据海域重力场的变化特点和现有技术条件,分别提出了利用卫星测高重力向上延拓和超高阶位模型(EGM2008)直接计算延拓改正数,从而实现航空重力测量向下延拓归算的两种实用方法,联合使用卫星测高、海面船测和航空重力测量数据进行了实际数值计算和精度评估,验证了新方法的有效性。

Two practical downward continuation methods are proposed for the sea surveying areas in accordance with their gravity characteristics and available information addressing the uncertainty of downward continuation for airborne gravity data. In the first method, the continuation corrections are calculated by using the upward continuation of satellite gravity data, and in the other, by using EGM2008 gravity field model. A satellite gravity data set, two sea-borne gravity data sets, and an airborne gravity data set are used as a case study to test the efficiency of these new methods.