Abstract: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.
LI Zhuo,ZHANG Tisheng,YAN Kunlun et al. A Phase Prediction Method for Improving Carrier Phase Continuity of GPS Receiver[J]. jgg, 2018, 38(12): 1280-1284.