似大地水准面的误差分析与抑制技术

Error analysis and prevention technique of quasi-geoid

大地水准面误差分析与精度评定是局部重力场逼近技术的重要组成部分,是大地水准面精化工程外业方案优化、算法设计和工程质量评价的基本依据。本文分别从地面重力数据误差和局部重力场算法两个方面,分析cm级大地水准面误差的影响特性,提出重力数据误差与大地水准面精度之间普遍适用的规律,推荐一种GPS水准和地面重力数据联合平差的精度评定方法,结合实例和模拟计算分析,介绍大地水准面误差分析与误差抑制方法。

The error analysis and precision evaluation are very important parts of local gravity field approach,and they are also the foundation of outwork scheme optimization,arithmetic design and quality estimation of engineering in geoid determination.Firstly,this paper presents the general law between error of gravity data and precision of geoid.Then,a new precision evaluation method of geoid is recommended by an adjustment model with gravity and GPS/Leveling data.Finally,some methods of error analysis of geoid and error prevention by instance and simulation are introduced.