Adaptive PLL Based Carrier Tracking Algorithm for GPS Signals in High Dynamic Environments
Sheraz Anjum · Dianzi qijian · 2007
A four-dimensional Kalman filter based adaptive phase-locked loop(PLL) algorithm is proposed for the carrier tracking of high dynamic GPS signals.The equivalence between Kalman filer and digital phase-locked loop is derived and the corresponding loop update method is proposed.The simulation results show that the RMS frequency error performance is improved obviously compared with the fixed-gain digital phase-locked loop(DPLL) algorithm.