Design and implementation of multiple channel GPS raw data acquisition system

The implementation and the principle of multiple channels GPS raw data acquisition system based on FPGA implementation are introduced. The design of the frequency-down module, digital module, data transformation, and storage module is accomplished. The software receiver algorithms for the satellite signal acquisition and track are given. Finally, the system test is presented. The test result shows that the process of the acquisition, the track and data demodulation are reasonable. The system has advantages of multiple channel, high speed storage, sampling speed reconfiguration, and optional data format.