基于广播星历改正的实时精密星历与钟差获取研究  

Research on the Acquisition of Real-Time Precise Ephemeris and Satellite Clock Corrections Based on the Broadcast Ephemeris

作　　者：王俊杰[1] 许杭[1] 高俊强[1] 

机构地区：[1]南京工业大学测绘学院,江苏南京210000

出　　处：《全球定位系统》2015年第2期21-25,共5页Gnss World of China

摘　　要：卫星位置误差和钟差是GPS导航与定位的重要误差源。通过NTRIP协议,利用Internet方式向全球发布实时广播星历的卫星轨道和钟差改正信息。结果表明：由广播星历计算得到的卫星位置和精密星历中给出的位置值相差为分米级,而经过改正后的卫星位置相差仅为厘米级。采用广播星历中给出的钟差参数,其精度约为2~4ns;经过钟差改正后,精度相差约0.3-0.4ns.Satellite position error and clock error are an important error source of GPS positioning and navigation.Based on the NTRIP agreement,this article makes use of the Internet to publish real-time broadcast ephemeris of satellite orbit and clock correction information to the global.Results show that the satellite position calculated by the broadcast ephemeris and the position given by precise ephemeris value differs as the decimeter level,however,after correction,satellite position differs only to cm.Using the clock difference parameters given by the broadcast ephemeris,the accuracy is about 2~4ns;After the clock error correction,the accuracy is about 0.3~0.4ns.

关 键 词：广播星历 卫星位置 卫星钟差 NTRIP协议 

分 类 号：P228.4[天文地球—大地测量学与测量工程]