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Modified measurement model of stellar horizon atmospheric refraction

HU Jing,YANG Bo(School of Astronautics,Beihang University,Beijing 100191,China)  
The basic and key issue of Stellar Horizon Atmospheric Refraction concept for satellite autonomous navigation is to establish the accurate measurement model.However,the positioning precision of the model at home and abroad is limited due to the uncertainty of the atmospheric parameters.According to the rule that atmospheric density would vary with altitude,latitude,seasons,and by thoroughly studying on the principle of the atmospheric refraction,the data of stratospheric atmosphere,the atmospheric model,the continuous density atmospheric model was set up.On this basis,a self-adapted continuous measurement model(20~50 km)was established through changing fixed altitude and single density,which could improve the precision of the satellite autonomous navigation and the dependability as well in the whole.At the same time,the system equation with the orbit perturbations was established based on analyzing the effect of several sorts of perturbations on the system state model.Then a simulation testing was performed using the Unscented Kalman Filter algorithm,and finally the error source was analyzed.
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