The Research on GPS Signal Acquisition Algorithm Based on Coherent Integration

In the flight test, GPS data plays a very important role in the post-processing of telemetry data. It is required to ensure the continuity of GPS data in the complex environment, and it can he quickly and accurately recovered if breakpoints appear. Therefore, this paper will carry out a research on GPS signal acquisition algorithm. Based on the coherent integration algorithm, a combination of coarse and fine acquisition is proposed. The coherent integration algorithm realizes the coarse acquisition of GPS signal, improving the FFT frequency precision to realize the fine acquisition, and finally using the frequency-domain frequency offset estimation algorithm to further improve the frequency acquisition accuracy .Simulation results show that the algorithm proposed in this paper can keep the acquisition error in a small range under different signal-to-noise ratios.