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GPS phase measurement cycle-slip detection based on a new wavelet function
ZHENG Zuoya,LU Xiushan,WANG Xinzhou,CHEN Chuanfa 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.2 No.-
Presently, cycle-slip detection is done between adjacent two points in many cycle-slip methods. Inherently, it is simple wavelet analysis. A new idea is put forward that the number of difference point can adjust by a parameter factor; we study this method to smooth raw data and detect cycle-slip with wavelet analysis. Taking CHAMP satellite data for example, we get some significant conclusions. It is showed that it is valid to detect cycle-slip in GPS phase measurement based on this wavelet function, and it is helpful to improve the precision of GPS data pre-processing and positioning.
GPS Satellite Orbit Prediction Based on Unscented Kalman Filter
Zuoya ZHENG,Yongqi CHEN,LU Xiushan,DU Zhixing 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.1 No.-
In GPS Positioning, the error of satellite orbit will affect user’s position accuracy directly, it is important to determine the satellite orbit precise. The real-time orbit is needed in kinematic GPS positioning, the precise GPS orbit from IGS would be delayed long time, so orbit prediction is key to real-time kinematic positioning. We analyze the GPS predicted ephemeris, on the base of comparison of EKF and UKF, a new orbit prediction method is put forward based on UKF in this paper, the result shows that UKF improves the orbit predicted precision and stability. It offers a new method for others satellites orbit determination as Galileo, and so on.