一种改善GPS接收机载波相位连续性的相位预测方法

针对GPS信号受短时遮挡等影响导致载波相位不连续问题，提出一种基于载波开环跟踪的相位预测方法。通过对失锁通道的多普勒进行精确预测实现对载波相位进行开环跟踪，重点改善接收机晶振钟漂对多普勒估计精度的影响。基于软件接收机对该方法进行性能评估，在部分GPS信号连续中断15 s情况下，其估计的载波相位误差小于1/4周的概率在90%以上。

A Phase Prediction Method for Improving Carrier Phase Continuity of GPS Receiver

We propose a phase prediction method based on carrier open-loop tracking to solve the problem of carrier phase discontinuity in the case of short-time occlusion of GPS signals. The prediction method realizes the open-loop tracking of carrier phase by accurately predicting the doppler of the lost-locked channel, and focuses on improving the influence of the receiver clock drift on the doppler estimation accuracy. The performance of the proposed method is evaluated based on the software receiver. The test results show that the probability of carrier phase error less than 1/4 cycles is more than 90% when the partial GPS signal is interrupted by 15 s.