Reduced-Dynamic Precise Orbit Determination Based on Helmert Transformation
Four fundamental approaches in the Precise Satellite Orbit Determination (POD) are Dynamic POD, Reduced-Dynamic POD, Kinematic POD, and Reduced-Kinematic POD (Svehla & Rothacher, 2003, Liu et al. 2004). Generally, two kinds of information are considered: dynamic parameters and kinematic factors. In the dynamic method, the orbit precision mainly depends on the initial orbits and the dynamic models. Using the dynamic models recommended by IERS, the 12-hour extrapolated orbits reach a precision of several centimeters. Therefore the main task for dynamic POD is to get the precise initial orbits. On the other hand, in the kinematic method, the main problem is how to reduce influence of weak geometry and phase breaks.
We suggest a reduced-dynamic POD model based on the Helmert transformation. The model connects the dynamic integrated orbits and the precise kinematic orbits. Using GPS data, we get the results that the orbit-precision of none-corrected orbits is at the level of decimeter, while the corrected orbit-precision using the proposed model is several millimeters.
KeywordsDynamic orbit kinematic orbit precise orbit determination helmert transformation
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