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第五届中国卫星导航学术年会

作者： Feng He Xiaogong Hu Li Liu Hua Huang Shanshi Zhou Shan Wu Li Gu He Zhao Xiao Liu Beijing Satellite Navigation center Shanghai Astronomical Observatory Chinese Academy of Sciences

Broadcast ephemeris parameter is an important reflection of navigation system service performance. In hybrid constellation, GEO, IGSO and MEO satellites have different dynamic characteristics which lead to different fitting performances. In this article, the basic physical meaning of ephemeris parameters are analyzed, and the evaluation for the variation characteristics of fitting parameters is carried on. Several improved algorithms are proposed from the aspect of mathematical processing, which effectively eliminates the unsuitability in the parameter fitting of GEO. The fitting accuracy of 3 types of satellites are analyzed based on the 16‐parameter model, and then the evaluation of fitting performance is completed. It is proved in the experiments: the high accuracy can be realized for the 3 types of satellites, and even the accuracy is prior to 1cm for most time. For GEO, the accuracy can be sub‐centimeter, while the accuracy can be millimeter for IGSO and MEO satellites. In summary, the 16‐parameter model is enough to meet the centimeter level application requirement .

关键词： hybrid constellation ephemeris fitting biased estimate satellite navigation

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Satellite-station time synchronization information based real-time orbit error monitoring and correction of navigation satellite in Beidou System

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Science China(Physics,Mechanics & Astronomy) 2014年第7期57卷 1395-1403页

作者： HE Feng ZHOU ShanShi HU XiaoGong ZHOU JianHua LIU Li GUO Rui LI XiaoJie WU Shan Shanghai Astronomical Observatory Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences Beijing Satellite Navigation Center

Satellite-station two-way time comparison is a typical design in Beidou System(BDS)which is significantly different from other satellite navigation *** a type of two-way time comparison method,BDS time synchronization is hardly influenced by satellite orbit error,atmosphere delay,tracking station coordinate error and measurement model ***,single-way time comparison can be realized through the method of Multi-satellite Precision Orbit Determination(MPOD)with pseudo-range and carrier phase of monitor *** is proved in the constellation of 3GEO/2IGSO that the radial orbit error can be reflected in the difference between two-way time comparison and single-way time comparison,and that may lead to a substitute for orbit evaluation by *** this article,the relation between orbit error and difference of two-way and single-way time comparison is illustrated based on the whole constellation of *** the all-weather and real-time operation mode of two-way time comparison,the orbit error could be quantifiably monitored in a real-time mode through comparing two-way and single-way time *** addition,the orbit error can be predicted and corrected in a short time based on its periodic *** is described in the experiments of GEO and IGSO that the prediction accuracy of space signal can be obviously improved when the prediction orbit error is sent to the users through navigation message,and then the UERE including terminal error can be reduced from 0.1 m to 0.4 m while the average accuracy can be improved more than 27%.Though it is still hard to make accuracy improvement for Precision Orbit Determination(POD)and orbit prediction because of the confined tracking net and the difficulties in dynamic model optimization,in this paper,a practical method for orbit accuracy improvement is proposed based on two-way time comparison which can result in the reflection of orbit error.

关键词： satellite navigation orbital mechanics time synchronization ephemeris fitting

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