The Design for High Dynamic GPS Receiver in a Combinated Method of FLL and PLL

Abstract

To solve the problems that the large Doppler shift makes satellite signals difficult to be captured and the high dynamic stress damages the health of the tracking loop, a novel design is proposed for high dynamic GPS receiver, which can rapidly capture signals against the large Doppler shift and has high tolerance of the high dynamic stress in its tracking loop. The satellite signals are captured by means of linear search method. The carrier wave is tracked by carrier tracking loop using Frequency-locked loop (FLL) assisted by phase-locked loop (PLL). The form of Carrier wave aided is adopted in the pseudo-code tracking loop. The experiment shows the receiver prototype can track 100 g/s high dynamic signal, which indicates that the receiver prototype could satisfy the error limits of the tracking loop, and it also can capture the visible satellite signals with a good effect of real-time tracking lock.