地磁偏角测量GPS基准点误差分析

Deviation Analysis of GPS Reference Points in Geomagnetic Declination Surveys

从地磁偏角测量原理与方法入手,针对GPS基准点选取不同对地磁偏角观测带来的影响进行误差模型构建和相关误差分析,绘制地磁偏角误差随GPS基线长度变化曲线图,根据误差模型实例分析评估结果,得到地磁偏角实测GPS基准点设定的误差变化规律与GPS设点方法,根据此方法可以有效控制GPS基准点误差落在预定的误差区间内,使地磁偏角观测满足规范的精度要求。

：Based on the geomagnetic declination survey’s theory and technology,the deviation model is built from the effect of the different GPS reference points’ position selection on the geomagnetic Declination survey accurate evaluation.Then,the deviation analysis is carried on and the relative curve diagram is plotted betweenthe geomagnetic deviation and the GPS base line distance.According to the data analyzing result of the error model estimation example,the regularity of the relative error changing and the methods of GPS points’ position selection are obtained with which the GPS baseline points’ error can be fallen into the predictive error areas and the accuracy of geomagnetic declination survey can be met with the specification.