A prediction model of real time satellite clock error and its application
Aiming at the problem that global navigation satellite system(GNSS)real-time precise point positioning(PPP)relies on high-accuracy real-time satellite clock and orbit corrections services,while short-term communication interruptions can easily cause the real-time service of International GNSS Service(IGS)to be unavailable,the paper proposed a satellite clock error short-term prediction scheme based on quadratic polynomials and eighth-order harmonic-based function:the quartile method was adopted to detect and eliminate gross errors in the real-time satellite clock error sequence between epochs,and to calculate the clock error model coefficients;then,the real-time clock error between epochs during communication interruption was predicted;finally,the satellite clock error during the interruption period was recovered by combining the latest clock error received before the real-time service interruption.Experimental results showed that when communication was interrupted for a short period,the clock error prediction model modeled using 2-hour data could achieve a prediction accuracy of mean standard deviation(STD)of 0.184 ns,and the accuracy of rubidium clock error prediction would be better than that of cesium clock;moreover,the proposed clock error prediction scheme for 2 minutes could achieve kinematic PPP accuracy comparable to IGS real time satellite clock error products,ensuring the continuity and stability of real-time high-precision positioning applications.
satellite clockreal-time servicecommunication outageprecise point positioning(PPP)gross error detection
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