C/A code of GPS software receiver fast acquisition based on FPGA

According to the further study on the signal acquisition of GPS C/A, the decline of SNR (Signal Noise Ratio) in the process of the signal acquisition lead to capture the signal too hard. The GPS C/A fast acquisition algorithm-secondary sample non-coherent algorithm based on FPGA was presented. The whole hardware and pipeline techniques were introduced in the process of GPS C/A signal acquisition, and the secondary sample non-coherent algorithm was simulated by the program of DSP Builder on FPGA . The simulation results showed that it took less than 100μs to capture the first-satellite signal and 20.48μs to capture the residual satellites, and its performance was better than that of the DSP chip. At the same time, the resources occupation of the chip was decreased and the signal acquisition speed was improved. The new algorithm can fast capture the GPS C/A signal code. The study of the secondary sample non-coherent algorithm on FPGA benefits the practicality of GPS software receiver.