北斗新一代导航卫星的组合钟差预报模型及精度评估  

Combined Clock Error Prediction Model and Accuracy Evaluation of BeiDou New Generation Navigation Satellite

作　　者：王冬霞 郭睿 谢金石[1,2] 胡小工 袁运斌[2] WANG Dongxia;GUO Rui;XIE Jinshi;HU Xiaogong;YUAN Yunbin(Beijing Satellite Navigation Center,Beijing 100094,China;State Key Laboratory of Geodesy and Earth’s Dynamics,Wuhan 430037,China;Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China)

机构地区：[1]北京卫星导航中心,北京100094 [2]大地测量与地球动力学国家重点实验室,湖北武汉430077 [3]中国科学院上海天文台,上海200030

出　　处：《测绘学报》2018年第B12期61-70,共10页Acta Geodaetica et Cartographica Sinica

基　　金：国家自然科学基金(61603397; 41874043);大地测量与地球动力学国家重点实验室开放基金(SKLGED2017-3-3-E)~~

摘　　要：星载原子钟是导航卫星的核心设备,其性能及钟差预报精度直接决定了导航定位授时精度。本文利用星地星间双向时间同步数据,评估了新一代导航卫星星载原子钟的在轨实际性能及钟差预报精度。首先,研究了卫星钟性能评估方法,利用组合MAD粗差探测法对钟差数据进行预处理,采用最小二乘拟合多项式函数法评估频率准确度和频率漂移率,采用重叠哈达玛方差计算并讨论频率稳定度。其次,研究了卫星钟差预报模型,采用经典权方法对多项式模型和灰色模型进行综合,设计了一种加权组合钟差预报模型。最后,利用新一代导航卫星和北斗区域卫星的钟差实测数据进行分析,评估了原子钟性能及钟差预报精度,并研究性能指标与钟差预报精度的相关性。结果表明,与北斗区域系统相比,新一代导航卫星的频率准确度、频率稳定度都有不同程度提高;钟差预报精度约有一倍提升;星间链路大大增加了新一代MEO卫星的钟差测量弧段,提升了重新入境后的预报精度。The atomic clock is the core equipment of navigation satellite,and its performance and prediction accuracy directly determine the PNT accuracy.The authors evaluated the in-orbit performance and prediction accuracy on atomic clock of new generation navigation satellite using bi-directional time synchronization data.Firstly,the performance evaluation method of satellite clock is studied.The clock error data are preprocessed by the combined MAD gross error detection method.The frequency accuracy and frequency drift rate are evaluated by the least square method and polynomial function method.The frequency stability of the satellite clock is calculated and discussed by the overlapping Hadamard variance.Secondly,the weighted combined clock error prediction model is established,which synthesize the polynomial model and the gray model by the classical weighted method.Finally,the performance and prediction accuracy of the atomic clock is evaluated by using the measured data of the new generation satellites and the regional satellites.The results illustrate that the frequency accuracy,stability and prediction accuracy of the new generation satellites are improved.Moreover,the inter-satellite link increases greatly the measure arc of MEO satellite,and simultaneously improves the prediction accuracy of re-entry.

关 键 词：新一代导航卫星 钟差预报 星载原子钟 性能评估 

分 类 号：P228[天文地球—大地测量学与测量工程]