Aiming at the orbit floating or so called constellation rotation in navigation satellite autonomous orbit determination, an
approach based on multi sources data fusion was introduced, that is to introduce angle observation from on board star
sensor toward fixed star to fix the ascending node Ω, one of the six orbit elements so as to avoid constellation rotation.
During data processing, a generalized measurement model based on matrix Cholesky decomposition and the method of
measurement noises de-correlation was adopted. On the foundation of roundly analysis of present theories and methods
of multi sources data fusion, and characteristics of multi sources measurement data fusion taken into account, two sorts
of multi sources data fusion measurement models based on independent same distribution and correlation of
measurement noises were conducted. Theoretical analysis and simulation experiment show that navigation satellite
autonomous orbit determination based on multi sources data fusion can well solve the problem of orbit floating
contrasting against that of only inter-satellite observations used.
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