星载GPS 伪距观测量重建及定轨精度分析

讨论了如何从星上下传的卫星位置数据中重建星载GPS 伪距观测量, 分析了重建伪距数据事后动力学 定轨精度及该方法对提高LEO 卫星位置精度的贡献。GRACE-A 卫星2008 年3 月1 日—14 日实测数据计算结果表明: 重建数据事后动力学定轨能显著提高地面主控站接收到的LEO 卫星实时位置精度; 其中由C/A 码伪距和广播星历 实时单点定位得到的卫星位置精度约为15m, 重建伪距事后动力学定轨得到的卫星位置精度约为2m。

Accuracy of dynamic orbit determination using rebuilt space-borne\nGPS pseudo-range measurements from real-time navigation solutions

The method to rebuild space-borne pseudo-range measurements from real-time position data is discussed first in this paper. And then, the accuracy of dynamic orbit determination using rebuilt pseudo-range measurements and precise GPS ephemeris is analyzed in detail. Data from GRACE-A satellite from March 1 to 14 in 2008 is processed for this purpose. Research results show that the accuracy of real-time single point positioning using C/A code pseudo-range measurements and GPS broadcast ephemeris is about 15m, and the accuracy of dynamic orbit determination in post-processing mode is about 2m. It is demonstrated that dynamic orbit determination using rebuilt pseudo-range measurements in post-processing mode can not only significantly improve the position accuracy of real-time navigation solutions, but also provide consecutive satellite orbits.