BDS载波相位历元间差分测速方法研究  

Research of BDS velocity estimation with time differenced carrier phase method

作　　者：闫勇伟 叶世榕[1] 夏敬潮[1] 

机构地区：[1]武汉大学卫星导航定位技术研究中心,武汉430079

出　　处：《测绘科学》2016年第7期193-196,210,共5页Science of Surveying and Mapping

基　　金：水利部公益性行业科研专项基金资助项目(201401072)

摘　　要：针对载波相位历元间差分测速前后历元选取不同广播星历计算时,卫星钟差跳变导致测速结果错误突变的问题,提出前后历元仍采用相同的广播星历来计算卫星位置和钟差的改进方法。用北斗实测数据验证了方法的正确性,并评估了北斗测速的精度。实验结果表明:静态条件下,北斗载波相位历元间差分测速精度可达mm/s级;动态条件下,采样率1Hz,测速结果与高精度组合导航测速结果符合精度为cm/s级;并且测速精度与物体的动态条件(如加速度)有一定的相关性。In view of the problem that there exist spike errors due to the jump of the satellite clock bias when the two consecutive epochs adopt difference broadcast ephemeris, this paper used the same ephemeris set to calculate position and clock bias of satellites in two consecutive epochs when using time-differenced carrier phase （TDCP） technique for velocity determination. Beidou navigation satellite system （BDS） data was used to verify the wilidity of the improved method, and to assess the accuracy of velocity estimation of BDS. Experimental results showed that the velocity precision using TDCP technique could reach mm/s lev- el in static conditions; while in dynamic conditions and a data rate of 1s, the mean square statistics of the velocity discrepancies between TDCP and INS/GPS accorded with cm/slevel; moreover, it had some correlation with the acceleration or jerk of the vehicle.

关 键 词：北斗卫星导航系统 单点测速 载波相位历元间差分 星历选择 

分 类 号：P228[天文地球—大地测量学与测量工程]