Research on High Dynamic GPS Software Receiver
Jinsheng Zhang · Journal of Astronautics · 2009
To improve the capturing speed,tracking accuracy and dynamic adaptability of GPS receiver,a novel scheme of GPS software receiver was presented.First,the C/A code start of every satellite was searched through the delay-multiply configuration,then the delay and accumulation unit was put forward to pretreat the multi-frequency signals.The separation and estimation of Doppler-shift components were fulfilled by frequency domain analysis on post-treatment signals,therefore,the two-dimensional searching process in conventional acquisition scheme was transformed into two one-dimensional searching processes in the proposed acquisition scheme,thus improved the capturing speed.Second,multi-assisted tracking loop was proposed to estimate the frequency and phase of carrier and C/A code.Sampled data from GPS receiver and simulated high dynamic GPS signals were used for simulation experiments.Simulation results indicate the validity of the proposed software receiver scheme.