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0.02ns,恢复后的卫星钟差精度优于0.25ns.
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,non-difference 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.
作者
代桃高
赵静
王子龙
DAI Taogao;ZHAO Jing;WANG Zilong(China Luoyang Electronic Equipment Testing Center, Luoyang 471000, China;Caton Luoyang Intelligent Technology co.,Ltd, Luoyang 471000, Chinga)
出处
《全球定位系统》
CSCD
2018年第2期79-83,共5页
Gnss World of China
关键词
历元差分模型
北斗
卫星钟差
载波相位
平方根滤波
Epoch difference model
BeiDou satellite
satellite clock offset
carrier phase
square root filter
