Modeling and Simulation on GNSS Vector Tracking Loop Based on Extended Kalman Filter
Zeng Guang-y · Acta Armamentarii · 2015
Considering a limited public information about analysis of GNSS vector tracking algorithm control process,a vector delay / frequency lock loop( VDFLL) tracking model is established,and a derivation on the model's linearization process is proposed. The sequential control logic of vector tracking algorithmis analyzed. For the fact that VDFLL cannot lock the carrier phase,a message demodulation mode based on series phase-locked loop( PLL) is put forward. And a vector VDFLL model is implemented on the platform of a software receiver. The simulation results indicate that the controlling model not only can output correct and optimal estimate for receiver state information,but also has an excellentdynamic tracking performance.