高程及卫星轨道误差对Z坐标的影响

The Influence of the Satellite Orbit Errors and Height Errors on Z-Coordinate

从Z坐标与高程的关系入手 ,分析讨论了卫星轨道误差及高程误差对Z坐标精度的影响。结果表明 :高程误差对Z坐标的影响随着纬度的增高而增大 ,在南北半球具有互相抵偿性 ;卫星轨道径向误差是影响高程精度的重要因素 ,对高程的影响与基线长成正比。文中提出了改善Z坐标精度的有效途径 ,针对GPS数据处理中如何合理选择IGS站 ,以便有效提高Z坐标的精度提供了一定的理论依据。

This paper discusses the influence of the satellite orbit errors and height errors on Z coordinate precision, on the basic of the ralationsship of Z coordinate and height. We draw the conclusion that the influence of height errors on Z coordinate increases as the latitude rising. The influences of height errors on Z coordinate cancel out in the south and north hemisphere.