A study of GPS signal fast acquisition algorithm aided by interia information

A large doppler frequency shift will be produced under high dynamic environment,and GPS receiver cost longer time to capture satellite signals. That is a great drawback to some high dynamic carrier especially to some high-speed guided weapons. The paper proposed an acquisition algorithm aided by inertia information under high dynamic environment. Here the real-time speed and position of carrier is estimated by the inertial information and the doppler shift is estimated by ephemeris combined with inertial information. The algorithm can decrease range of frequency, reduce the search time and increase the acquisition speed. The semi-physical simulation experiment was performed to test the acquision performance of receiver that work at static state and high dynamic environment and it proves that algorithm can increase the acquisition speed.