广义线性高程拟合法在物探中的应用

Application of general linear height fitting method in geophysical prospecting

地球物理勘探工作需要三维坐标为其定位,尤其是重力勘探,对高程有较高的要求。作为一种先进的现代化测量技术,GPS能实时提供高精度的平面坐标,但因其使用W G S-84坐标系统,高程为大地高,没有实际的地球物理意义。地球物理勘探用的是正常高,故GPS测量的大地高无法直接使用。若联测高程,不仅增加工作难度,时间成本和经济成本也将大大增加。本文以长江中下游某些地区地球物理矿产勘查为例,介绍利用广义线性拟合法来获取高程。该模型不仅能对拟合结果进行评价,亦能评价模型参数的优劣。

Three-dimensional coordinates are constantly required in orientation for geophysical prospecting,especially for gravitational prospecting with strict requirement for height coordinates.As an advanced modernized technique,GPS can provide high-precision planar coordinates,however,the geodetic heights obtained by using WGS-84 coordinate system in using GPS have no practical geophysical significance.In geophysical prospecting the normal heights are adopted,so the geodetic heights measured by GPS can not be directly used.If the continuou height measurement is applied,it increases not only difficulty in the work but also time and economic costs.The present paper introduces the heights acquired by using general linear fitting method,taking the geophysical ore-prospecting in some areas in the middle-low valley of Yangtze river as an example.The fitting model can be used to evaluate not only fitting results but also fitting parameters of the model.