一种卫星钟自相关的实时钟差预报算法A real-time clock offset prediction algorithm based on satellite clock offset autocorrelation
杨旭,王潜心,吕伟才
摘要(Abstract)：
针对实时精密单点定位(RT-PPP)中实时数据流存在中断、延迟等问题,该文构建了顾及卫星钟自相关的随机模型,提出了一种基于方差分量估计的自适应卡尔曼滤波钟差超短期/短期预报算法,评估了连续27 d实测法国空间研究中心(CNES)实时数据流CLK93产品完整率和精度水平,利用哈达玛方差对比分析了该实时产品与德国地学研究中心(GFZ)事后GBM产品的频率稳定性。利用本文算法与传统卡尔曼算法对两类产品进行预报,结果显示:CLK93产品BDS系统(C)、GPS系统(G)、GLONASS系统(R)、Galileo系统(E)30 s和1 min预报精度分别平均提升了8.50%、8.44%、7.20%、6.96%;GBM产品相应4个系统12 h和24 h预报精度分别平均提升了3.14%、3.53%、0.96%、10.01%。
关键词(KeyWords)： 实时钟差预报;自相关性;多GNSS;自适应Kalman滤波
基金项目(Foundation): 安徽理工大学引进人才科研启动基金项目;; 国家自然科学基金项目（41874039,41404033）;国家自然科学基金重点项目（41730109）;; 国家科技基础性专项（2015FY310200）
作者(Author): 杨旭,王潜心,吕伟才
DOI: 10.16251/j.cnki.1009-2307.2021.01.004
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