顾及高频影响的局域GPS水准高程的“RR”方法

来源期刊：中南大学学报(自然科学版)2000年第2期

论文作者：李朝奎 黄力民 傅明

文章页码：95 - 97

关键词：局域GPS高程;高频分量;“RR”方法;广义最小二乘法

Key words：marked-area GPS elevation; high-frequency component; way of“RR”; generalized LS theory

摘    要：地形起伏可以视为重力场的噪声,它极大地影响局域内GPS水准高程的精度.通过分离高频短波分量(由地形变化引起),对中、长波分量作二次解析模拟,利用广义最小二乘法进行高程异常值估计,将估计出的高强异常值加上用物理方法测定的高频分量即得地面点的高程异常值.此外,讨论了GPS水准误差来源及GPS水准高程的质量准则.该方法有助于改善地形起伏地区高程异常的精度,有广泛的应用前景.

Abstract: Terrain undulation which is of the high-frequency component of the geoid hom-owave may be treated as a sort of noise adhered to Gravity. It will greatly reduce the precision of marked-area GPS height .In this paper, a way of “RR” is introduced. Firstly, the high-frequency component is computed, then middle wave and long wave component is fitted by the model of quadratic surface. Taking the model error and gross error into full consideration, estimating the middle and long wave components under the generalized LS guide, the abnormal elevation value of each ground point by adding estimated abormal elevation value to the high-frequency component obtained in physical measurencent can be obtained. The paper discussed the error of GPS level height and its quality rules, which will help improve accuracy of marked-area GPS height. This method will have a wide application.