摘要
本文沿两条途径（模型逼近和算子逼近）回顾了确定地球外部重力场的七种主要方法，分析和比较诸种方法理论上的严密性，数学上的可靠性，实用上的易行性。为求完整，在有些方法中，还一并介绍近年来对其改进与完善的研究成果。与逼近方法并列，扰动场数据结构的合理应用，是理想的重力场逼近技术中不可缺少的两翼。本文基于扰动场元的谱特性，简要介绍了当前和未来可能的数据类型及其在局部重力场逼近技术中的功用。最后概述了较好地逼近扰动场任一元素的频谱分析方法。
:
The seven main methods of determining the external gravity field of the earth are reviewed along two approaches-model approximation and operational approximation The strictness in theory the reliability in mathematics and the simplicity in practice of these methods are analysed and compared Also introduced are recent improvements and per fections made in some of these method for the sake of completeness
Proper selection of approximation method and reasonable application of the data structure of disturbing field are two necessary flanks of vital improtance to the ideal gravity field approximation technique Based on the spectral characteristics of disturbing field elements possible data types in present and in the future and their functions in the approximation of local gravity field are briefly introduced Finally a brief account of the spectral analysis method which can better approximate any element of disturbing fi eld is given
出处
《测绘学报》
EI
CSCD
北大核心
1989年第4期313-320,共8页
Acta Geodaetica et Cartographica Sinica
