小地区GPS点正常高确定的一个新方法

A NEW METHOD OF GETTING NORMAL HEIGHT OF A GPS POINT IN A SMALL AREA

将ＧＰＳ获得的大地高转换为各地区所使用的正常高，一直是众所关心的研究课题。本文讨论了在小地区水准点的个数较少的情况下，借助于少量的三角高程点，采用线性及非线性改正的方法，对ＧＰＳ高程进行改正，以确定ＧＰＳ点的正常高。试验表明，采用该法可获得较为满意的结果。

It is a question for study or discussion to change ellipsoidal height given by GPS into normal height for using in a small area. In an area where there are only few benchmarks,by making use of a few trigonometric leveling points on the area and utilizing the method of linear correction or nonlinear correction, we can amend the ellipsoidal height of a GPS point and get its normal height. The experiment has testified that the result of so doing is a good one.