基于GPS的多站实时时间传递算法

提出了一种基于GPS的多站实时时间传递算法,该算法将卫星钟差作为未知参数进行实时估计,利用测站间的共视卫星建立起各测站误差方程之间的联系,同时解算站间时间传递结果和卫星钟差。摆脱了对外部事后精密卫星钟差产品的依赖,不受卫星精密钟差产品精度和实时性的限制,只要站间有足够的共视卫星,即可实现时间传递。实验结果表明:该算法时间传递精度可以达到亚纳秒量级,能够应用于高精度实时时间传递。

A Real-Time Multi-Station Time Transfer Algorithm Based on GPS

A real-time multi-station time transfer algorithm based on GPS is proposed.Satellite clock offsets are estimated as the unknown parameters in real time,and the connection among each station observations error equations is established by the common-view satellites.The time and frequency transfer result and satellite clock offsets are simultaneously solved.This method gets rid of the reliance of the external post precision satellite clock products,and is not limited by the accuracy and real-time of precision satellite clock products.As long as there is enough common-view satellite,inter-station time transfer can be realized.Experiments result show that the time transfer accuracy of the proposed algorithm can reach sub-nanosecond magnitude,and it can applied to high precision real-time time transfer.