ACTA AERONAUTICAET ASTRONAUTICA SINICA >
A Robust GNSS Vector Tracking Loop
Received date: 2013-12-13
Revised date: 2014-04-14
Online published: 2014-04-17
Supported by
National Natural Science Foundation of China (61201120); National High-tech Research and Development Program of China (2010AA7010213)
Reliable and continuous navigation over challenging environment is an important research focus in satellite navigation. Because the vector tracking loop has some limitations in dynamic environments and the errors spread among all the channels, this paper proposes a robust global navigation satellite system (GNSS) vector tracking loop. Firstly, the extended Kalman filter (EKF) is modeled with the states of pseudo range, pseudo range-ratio and pseudo range-acceleration errors of all the channels. The channels can be easily coupled and decoupled through adjusting the process noise covariance. Then, the code delay and Doppler shift errors are produced by the maximum likelihood estimator (MLE)-based discriminators. Lastly, the predicted pseudo range-ratios drive the local numerical control oscillator (NCO) to match the incoming signals and close the loop. Simulation results show that during the signal fading and blockage areas, the presented robust vector tracking loop can keep excellent tracking for all the channels and prevent the normal channels from being infected by the degraded ones, and provide a more robust tracking than traditional vector delay frequency lock loop.
CHENG Junren , LIU Guangbin , YAO Zhicheng , LIU Dong , YAO Zhiying . A Robust GNSS Vector Tracking Loop[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014 , 35(11) : 3106 -3114 . DOI: 10.7527/S1000-6893.2014.0055
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