学术论文

      GPS/BDS精密高频卫星钟差计算及应用

      Generation and application of GPS/BDS precise high rate satellite clock

      摘要:
      为了获得高采样率的GPS/BDS卫星钟差,对基于相位历元间差分的精密钟差加密方法进行了改进,并利用IGS MGEX观测站数据和GFZ提供的5 min采样率卫星钟差生成30 s采样率的GPS/BDS卫星钟差.分析结果表明:与GFZ提供的30 s采样率的精密钟差相比,二者差异在10 ps以内,且测站数量对钟差结果的影响不大;加密得到的30 s钟差与5 min钟差的Allan方差保持高度一致;移动历元动态PPP证实加密钟差并未损失原始钟差的精度.动态PPP统计结果表明加密后的钟差大大缩短了PPP收敛时间,并提高了定位精度.该方法计算效率高,可应用于更高采样率的卫星钟差估计中.
      Abstract:
      To derive high frequency GPS/BDS(global positioning system/Beidou system) satellite clock, an improved algorithm of epoch-differenced GPS/BDS satellite clock densification is proposed.GNSS(global navigation satellite system) data of the IGS(International GNSS Service) MGEX(multi GNSS experiment) tracking network and the GFZ GPS/BDS satellite clocks at 5 min sampling are densified to 30 s for the algorithm evaluation.Analysis results show that, compared with the 30 s clocks provided by GFZ, the satellite clock differences are below 10 ps.The number of stations has neglectable impacts on the precision of the densified clocks.The Allan deviation of 30 s clocks is consistent with that of 5 min.Kinematic PPP (precise point positioning) with shifted epochs demonstrates that the densified clock does not lose accuracy.Kinematic PPP using densified 30 s and original 5 min clocks shows that PPP convergence time is reduced and positioning accuracy is greatly improved using the densified clocks.The computation efficiency of the algorithm is high, so it can be applied in the estimation of higher frequency satellite clocks.
      作者: 张益泽 [1] 陈俊平 [2] 王解先 [3] 吴斌 [2]
      Author: Zhang Yize [1] Chen Junping [2] Wang Jiexian [3] Wu Bin [2]
      作者单位: 同济大学测绘与地理信息学院, 上海 200092;中国科学院上海天文台,上海 200030 中国科学院上海天文台,上海 200030;上海市空间导航与定位技术重点实验室,上海 200030 同济大学测绘与地理信息学院,上海,200092
      年,卷(期): 2017, 47(4)
      分类号: P228.1
      在线出版日期: 2017年8月15日
      基金项目: 国家高技术研究发展计划(863计划)资助项目,国家自然科学基金资助项目