Software design for performance analysis and prediction of GNSS satellite clock offset

The GNSS satellite clock directly affects the performance of positioning, navigation, and timing services. The analysis and prediction of satellite clock performance is an important task in GNSS monitoring and evaluation. According to the engineering practice requirements for performance analysis and prediction of satellite clocks, a visual satellite clock performance analysis and prediction software is designed and conducted using MATLAB language. The software provides functions such as clock offset data editing, quality control, characteristic analysis, and modeling and prediction. It can achieve batch processing of clock error data with the advantages of simple operation, strong interactivity, and data visualization. The test results show that the developed software can perform satellite clock performance analysis and prediction with just one click. The frequency drift rate, frequency stability and spectrum analysis results of GPS satellite clocks derived from this software are consistent with those from the Stable32 software. As for satellite clock prediction, the mean accuracy of the GPS satellite clock bias prediction for 24 h is 1 ns, which is higher than the 2.13 ns accuracy of the predicted clock products provided by the International GNSS Service (IGS). The prediction accuracy is improved by 53.05%. It proves that the software has high reliability and practicality.