关键词: C A码, GPS, 捕捉算法, 跟踪算法

Abstract:

The satellite positioning requires the capture and tracking of satellite signals. In this paper a C/A code of L1 band GPS signals were located. The visible satellite signal parameters that can be roughly estimated from the received signal are captured for the receiver to initialize the tracking loop and start tracking the signal. Parameter refinement is performed by the code tracking and carrier tracking module, after which the navigation data are demodulated. Simulation results show that the proposed method is accurate and fast in capturing and tracking the scheduled satellite signals from 32 satellites.

Key words: C A code, GPS, capture algorithm, tracking algorithm