【摘 要】
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BeiDou Satellite Navigation System requires accurate real-time orbit products to support high precision real-time PNT services.Currently,BDS treats broadcast ephemeris as real-time orbits,whose precis
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BeiDou Satellite Navigation System requires accurate real-time orbit products to support high precision real-time PNT services.Currently,BDS treats broadcast ephemeris as real-time orbits,whose precision is poor (at the level of meter).Based on characteristics of stations distribution and satellites constellations structure of BDS,this paper studies the method of real-timeorbit determination,designs the corresponding calculative strategy,discusses and analyzes the accuracy and update rate of real-time orbits,draws the following conclusions: (1) when 6-hour real-time orbits areextrapolated by 72-hour observed orbits calculated by BDS regional network,the accuracy of GEO and IGSO/MEO satellite orbits is about 3m and better than 2.5m; while by 72-hour observed orbits calculated byBDS global network,the accuracy of GEO and IGSO/MEO satellite orbits is better than 3m and 30cm respectively.(2) The accuracy of predictionorbitsextrapolated by 24-hour observed orbits calculated by BDS global network attenuates fast with the time period of the prediction increases.The average accuracy of 1-hour prediction orbits of GEO and IGSO/MEO is better than 70cm andabout 40cm,when the prediction duration is 6hours,the average accuracy of GEO and IGSO/MEO is about 120cm and 60cm respectively.Based on the current status and characteristics of BDS,using 3-day measured orbits to predict real-time orbits is the best strategy.With the improvement of stability and accuracy of the orbits calculated by single-dayobservational data,the high-frequency single-day prediction orbits with one hour update rate are the better choice as real-time orbits.
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