Research of high sensitive GPS software receiver developing platform
高灵敏度GPS软件接收机开发平台

First, hardware and software architectures of the software GPS receiver developing platform were introduced, especially the frequency domain acquisition algorithm and time domain tracking algorithm were described in details. Furthermore, the demodulation and synchronization of navigation data, capture of the satellite ephemeris, position solution of the user and simulation of the GPS signal were presented. All of these modules had been validated through field test data. Test results show that the PDOP is 2.3534, which is as good as traditional hardware GPS receiver. The platform can also generate simulating signals of the GPS system including different satellite C/A code, different intermediate frequency, and different Doppler frequency shift, which can be used for validating acquisition algorithm and tracking algorithm of a software GPS receiver. All the satellite signals can be acquired when SNR is -37dB in this platform, which means that the sensitivity has been improved remarkably over traditional hardware GPS receiver.