A Comparison for GLONASS Satellite Coordinate Calculation

To reduce the satellite orbit errors imported by the perturbation model simplification, a new method of satellite coordinate calculation for GLONASS is introduced, which is based on the assumption that the lunar and solar accelerations variations follow the linear function in a 30-minute interval. The given examples show that the method can improve the accuracy of satellite coordinate calculation for GLONASS slightly. In addition, the method for satellite coordinate calculation using the built-in MATLAB function ODE45 was examined also. Compared to the classical Runge-Kutta integration method (integral step= 30 seconds), this method can be used easily without degrading the accuracy according to the results of the given cases. With the same accuracy requirement, the method using ODE45 is more efficient than the classical one as well.