Accuracy of GPS single point positioning solution using IGS precise products

Abstract

GPS Single Point Positioning (SPP) is the common usage of navigation and meets the meter-level positioning requirements. The error sources including orbital error and satellite clock offset significantly affect the accuracy of the SPP solution. International GNSS Service (IGS) focuses on improvements of orbital and clock products since 1994. In this study, the SPP solution was performed with IGS final precise products using an in-house Matlab program. The ten-days dataset was evaluated with the program. Systematic errors decreasing the accuracy of the SPP solutions were modeled and then removed. Estimating GPS SPP solution was performed by the weighted least squares method for each epoch. It was observed that the accuracy of the solutions was associated with the number of satellites and GDOP values. The results revealed that the positioning accuracy was achieved at a maximum 21 centimeter level for the daily average, and RMSE values of all components were less than 1 meter. It was also clearly seen that the IGS precise products contributed to the accuracy of the GPS-SPP solution.