Study on Correlation and Prediction Accuracy of GPS Satellite Clock Bias Prediction in IGS Ultra-Rapid Products

In real-time GPS precise point positioning (PPP), it is the key to predict precise satellite clock bias (SCB) for real-time PPP. But it is difficult to hold the nuisance and inenarrable performance of space-borne GPS satellite atomic clock because of its high-frequency, sensitivity and impressionable, well. The correlation of SCB and residual are discussed from IGS ultra-rapid products, Taking the observations of IGS ultra-rapid products on 7^th and 8^th, Dec, 2004 for example, grey model, linear model and quadratic polynomial model are discussed in this paper, and got some helpful primary conclusions.