Analysis of Orbit Determination Accuracy of GEO Satellite Navigation Data

Aiming at the problem of rank deficiency of orbit determination algorithm equation caused by weak navigation signal, poor geometric structure of signal and small number of visible satellites of a GEO satellite, a weighted least square orbit determination algorithm with additional constraints are proposed based on the relative geostationary characteristics of GEO satellite, which can improve the success rate of orbit determination of GEO satellite navigation signal when the number of navigation satellites are less than 4 and the measurement value is poor. Shorten the initialization time of the receiver. Based on the characteristics of strong radial constraint, weak lateral constraint, strong lateral constraint and strong longitudinal constraint of the ground-based orbit measurement data, the feasibility of the above algorithm is verified by the space-based heterogeneous data fusion orbit determination test. The results show that the accuracy of the two kinds of orbit determination test results are the same, and the root mean square error of the total position in the overlapping trackarc is superior to 5 m. The root mean square error of the total velocity is superior to 2 mm/s. It is concluded that the effectiveness of GNSS system supporting orbit determination of high orbit spacecraft is verified, which provides technical support for the application of GNSS orbit determination mission in the future.