Application in BeiDou Satellite Clock Offset Real-time Determination with Epoch Differential Model
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摘要: 卫星钟差是影响卫星定位精度的重要误差源之一,而实时精密单点定位又要求卫星钟差实时更新。卫星钟差的解算可通过非差模型或历元差分模型实现,但非差模型涵盖较多的载波相位模糊度参数,相比消掉模糊度参数的历元差分模型,计算效率要慢许多。历元差分模型仅利用载波相位观测量就可获得高精度卫星钟差历元间差,恢复后的卫星钟差仍可达到一定精度水平。利用历元差分模型可实现北斗卫星钟差的实时解算,试验结果表明:通过滤波得到的卫星钟差历元间差精度优于0.02 ns,恢复后的卫星钟差精度优于0.25 ns.Abstract: Satellite clock offset is an important error source affecting the positioning accuracy, and real-time precise point positioning requests satellite clock updated in real time. The Satellite clock offset can be calculated by epoch difference model and non-difference model. Compared to eliminating ambiguity parameters of epoch difference model, nondifference model covers so many carrier phase ambiguity parameters that its computational efficiency is much slower. Epoch difference model can work out epoch difference of satellite clock offset with high accuracy only using carrier phase observation, and the restored satellite clock offset can retain a certain level. Using epoch difference model can realize real-time solution of Beidou satellite clock offset. The experimental results show that the accuracy of satellite clock offset difference between near epoch by the filter is better than 0.02 ns, and the restored satellite clock offset accuracy is better than 0.25 ns.
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Key words:
- Epoch difference model /
- BeiDou satellite /
- satellite clock offset /
- carrier phase /
- square root filter
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[1] 李征航,丁文武,李昭. GPS广播星历的轨道误差分析［J］.大地测量与地球动力学,2008,1(28):50-54. [2] 黄观文. GNSS星载原子钟质量评价及精密钟差算法研究［D］.西安:长安大学,2012. [3] 何明宪,李星星,李盼. 基于非差与历元差分两种观测模型估计精密卫星钟差的方法比较［J］. 大地测量与地球动力学, 2011,1(31):95-99. [4] 隋立芬,宋力杰,柴洪洲.误差理论与测量平差基础［M］.北京,测绘出版社,2010. [5] 施展,孟祥广,郭际明. GPS精密单点定位中对流层延迟模型改正法与参数估计法的比较［J］.测绘通报,2009(6):9-11. [6] 张国良,曾静.组合导航原理与技术［M］.西安:西安交通大学出版社,2008. [7] 许国昌.GPS理论、算法与应用［M］.北京:清华大学出版社,2011. [8] 宋伟伟. 导航卫星实时精密钟差确定及实时精密单点定位理论方法研究［D］.武汉:武汉大学,2011. [9] 潘宗鹏,蔡洪洲,董冰泉. 实时GPS精密卫星钟差估计及实时精密单点定位［J］. 海洋测绘,2015,5(35):12-15. [10] 李星星,徐运,王磊. 非差导航卫星实时／事后精密钟差估计［J］. 武汉大学学报,2010,6(35):661-664. [11] 楼益栋,施闯,周小青,等.GPS精密卫星钟差估计与分析［J］. 武汉大学学报,2009,1(34):88-91. -
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