Research on integrated orbit determination combined satellite-ground and inter-satellite observation based on helmert method of variance components estimate

Abstract

Because of the different precision of the satellite-ground and inter-satellite observations, how to correctly determine the weight of the two kinds of observations is still a key technique in integrated orbit determination. According to the ground stations and different kinds of the inter-satellite cross-link of the Chinese COMPASS satellite navigation system, the weight of the two kinds of observations was determined by the Helmert method of variance components estimate, and then the new weight was used in the integrated orbit determination. The results show that this method could reasonably determine the weight of satellite-ground and inter-satellite observations and improve the precision of integrated orbit determination. For the integrated orbit determination based on the Satellite-Ground and Inter-Satellite cross-link fixed antenna data, the orbit accuracies improve from 0.15 to 0.04 m after use the Helmert estimation weight to replace the priori. And the result is 0.06-0.03 m for the Satellite-Ground and Inter-Satellite cross-link UHF antenna data. © 2012 Springer-Verlag.