GPS定位精度的影响因素及差分GPS

Influencing Factors of the Positioning Accuracy of GPS and Differential GPS

从ＧＰＳ的误差来源出发，分析了ＧＰＳ定位精度的影响因素。结果表明，“选择可用性”（ＳＡ）是影响ＧＰＳ定位精度的主要因素。提出了两种消除ＳＡ干扰、提高ＧＰＳ定位精度的差分ＧＰＳ测量方法。实例说明差分ＧＰＳ比非差分常规定位的水平精度平均提高近６０ｍ，高程精度提高约３０ｍ。

Based on the analysis of positioning reasons of GPS(Navigation Satellite Timing and Ranging/Global Positioning System),influencing factors of the positioning accuracy of GPS are evaluated and the result shows that “selective availability”(SA) is a major factor.Two measurement methods to reduce the disturbance of SA and to improve the positioning accuracy are presented Observed results show that the average positioning accuracy in the differential GPS measurement is improved by about 60 meters in horizon and by about 31 meters in altitude than that in the conventional GPS measurement.