Abstract: Signal capture in dynamic environment is the key technology of the Global Positioning System(GPS) receiver. The phase delay of GPS signal and doppler frequency shift are produced by the receiver within a state of high speed movement, and the signal capture difficulty is increased. Two algorithms including FFT capturing and sliding relative to capture are analyzed. The FPGA implementation architecture based on FFT capturing algorithm is given，and the GPS signal simulator is adopted to verify the feasibility of the design which can capture signal. The results show that capture based on FFT algorithm can realize reliable signal capture in the navigation astrology for carrier rate of 1000m/s and acceleration of 5g cases.

Key words: GPS, Receiver, High speed movement, Carrier acquisition