顾及卫星钟差插值误差的GPS精密单点定位观测值随机模型

Abstract

针对GPS精密单点定位中观测值随机模型中没有考虑卫星钟差插值误差,提出了一种顾及卫星钟差插值误差的观测值随机模型。实验结果表明,对于精密单点定位中使用的卫星钟差节点时间间隔较大的产品(如5 min),考虑钟差插值误差的观测值随机模型能够显著地削弱卫星钟差插值引起的误差,而对于使用卫星钟差节点时间间隔较小的产品(如30 s),效果就不明显,符合GPS卫星钟差插值误差的特性。 In Present,there is no consideration for GPS satellite clock interpolation error in the observation stochastic model in Precise Point Positioning.An improved stochastic model considering the satellite clock interpolation error has been proposed.Experiments shown that this model could reduce the satellite clock interpolation error dramatically for larger time interval clock product(e.g.5 min) while has little improvement for small time interval product(e.g.30 s).The result accords with the characteristic of GPS satellite clock interpolation error.