The GPS code acquisition based on pipelined FFT processor
Wei Li, Haibing Zhu, Jun Wang, Shaohong Li · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2007
This paper describes one implementation of the long PN codes acquisition especially for GPS P(Y) code direct acquisition. The design method is based on the parallel method using the ultra long FFT (Fast Fourier Transform) based processing which searches over time uncertainty in parallel and frequency uncertainty serially. The FFT processor is based on R22SDF (single-path delay feedback) pipelined FFT architecture for its least memory use. The design was implemented with the FPGA device, and is tested and verified with the simulated GPS P code. The system can search in less than 60 seconds over 2.5 KHz of frequency uncertainty and 1 sec of time uncertainty with the work speed higher than 100MHz.