手持GPS单点定位精度分析

Analysis on the single point positioning accuracy of hand-held GPS

手持GPS标称精度一般在10 m左右,条件比较好的情况下可以达到3 m,实际应用中手持GPS的定位精度还有待提高。几种不同的方案系统地研究了手持GPS的精度,结果表明:四参数与三参数同时改正的情况下坐标精度最高,平面点位误差一般在3 m左右,高程误差一般在5 m左右;四参数与高程拟合参数改正的精度与三参数改正的平面坐标精度差不多,但前者高程测量精度要高一些。

The general accuracy of hand-held GPS was 10 m or so,it could reach 3 m in the better condition. Accuracy of hand-held GPS was still to be improved in the practical application. Accuracy of hand-held GPS was systematically studied by several different schemes. The results showed that the coordinate accuracy was the highest when the four parameters and the three parameters were corrected at the same time. Plane position error was generally about 3 m,elevation error was generally about 5 m; The precision of the four parameters and the elevation fitting parameter were almost the same as that of the three parameters correction. However,the former elevation accuracy was higher.