关于GPS单星定时提高定时精度的研究

为满足特殊用户或固定站点对高精度定时信息的需求，文中重点研究位置已知情况下基于卡尔曼滤波算法的GPS单颗星定时的方法。理论分析及仿真结果表明：与位置未知时四颗星联合定位／定时方法相比，位置已知情况下单颗星定时的精度优于位置未知时多星联合定位定时的时间精度，同时，利用观测到的多颗GPS卫星分别进行单星定时得到的信息，可进一步提高时间精度。

Improvement on Timing Precision of GPS Single Satellite Timing

In order to satisfy the timing requirement of special users and settled stations, a method of GPS single satellite timing under the condition of provided user position is proposed, and this method is based on algorithm of Kalman filter. The theoretical analysis and simulation results indicate that the timing precision of single satellite excels the combined positioning and timing precision of multiple satellites. In addition, the precision can be further improved by using the information from the respective single satellite timing of multiple GPS satellites.