一、引言 GPS卫星系统的实现使原子钟的信号能到达任何一个拥有接收机的用户。原子钟和用户网两者的确切表征对获取最佳的时间和频率信息是重要的。本文将叙述从GPS的一套数据中获取最佳的时间和频率信息的方法和某些接近最佳且简单的数据处理技术。考虑三种简单的情况:情况A为“共视法”(Common-View approach);情况B为直接观测单个卫星,采样时间为几秒到几小时;情况C为观测单个卫星,每天几分钟, I. INTRODUCTION The realization of GPS satellite system enables the signal of atomic clock to reach any user who owns the receiver. The exact characterization of both the atomic clock and the user network is important for obtaining the best information on time and frequency. This article describes ways to get the best possible time and frequency information from a set of GPS data and some near-optimal and simple data processing techniques. Consider three simple cases: case A is the “Common-View approach”; Case B is direct observation of a single satellite with a sampling time of a few seconds to a few hours; Case C is the observation of a single satellite for a few minutes a day,