在推求地球外部扰动重力场中数据的采用

APPLICATIONS OF DATA IN THE DETERMINATION OF THE EXTERNAL DISTURBING GRAVITY FIELD OUTSIDE THE EARTH

地球外部点的重力矢量值是由已知的全球重力位模型和各种不同方块的平均重力异常数据推求得到的。过去对选择和使用这些数据的依据不够充分,这就造成了某些随意性。本文对扰动重力在各种高度上的谱信息特征进行了分析,讨论了在一定的精度指标下各类平均异常数据区的大小范围以便为今后的实际工作提供必要的依据。

The gravity vector at a point in space is determined usully with a known global geopotential model and mean gravity anomalies in different size of blocks over a suitable region. In the past, it is not provide a sufficient basis for selecting and using the data so that one minght compute the disturbance with some arbitrary data. This paper gives some analyses of the spectral oharacter of the gravity disturbance at altitude, it will make us to recognize the change of the disturbance in numerical quantities. Then, the paper discusses the distribution range of different type of anomaly data to meet a given precision requirement, that will provide a reference for practical use.