北斗三频电离层延迟及码硬件延迟解算方法
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摘要
准确固定非差模糊度是利用相位观测量获取高精度电离层延迟的关键。三频观测条件下常规的处理策略需依次固定超宽巷、宽巷以及窄巷模糊度,通常利用MW(melbourne-wubbena)组合解算宽巷模糊度时易受到码硬件延迟和观测噪声的影响而固定错误。利用北斗三频数据和GIM(grid ionosphenimap)产品,通过固定的超宽巷模糊度以及构造相位无几何组合解算宽巷模糊度,进而重构得到高精度电离层延迟,并且分离了码硬件延迟总量。结果表明,GIM模型辅助条件下宽巷模糊度固定成功率能达到100%,且消除了系统性偏差;电离层重构值与GIM模型改正值存在约1 m的差异,等效精度约6TECU;分离的码硬件延迟变化平稳,标准偏差不超过0.3 m。
Getting precise undifferenced ambiguity resolution is the key issue when obtaining high-precise ionospheric delay with phase observations.Generally,extreme wide-lane (EWL),wide-lane (WL) and narrowlane ambiguities are needed in the process under triple-frequency conditions.The MW combination wide-lane ambiguity may be fixed into a wrong integer because of the influence of code hardware delay and observation noise.In this paper BDS triple-frequency observation and GIM production are applied to resolve wide-lane ambiguity with a fixed EWL ambiguity and phase geometry-free (GF) combination.In addition,high-precise ionospheric delay is reconstructed and code hardware delay is separated.Test results show that the wide-lane ambiguity fixing success rate rises to 100% when assisted with GIM information,while the ambiguity is free of systemic bias.There is a difference of about 1.0m between the reconstructed ionospheric delay and GIM corrections,meaning an equivalent precision of 6 TECU.The standard deviation of the separated code hardware delay is less than 0.3 m.
Getting precise undifferenced ambiguity resolution is the key issue when obtaining high-precise ionospheric delay with phase observations.Generally,extreme wide-lane (EWL),wide-lane (WL) and narrowlane ambiguities are needed in the process under triple-frequency conditions.The MW combination wide-lane ambiguity may be fixed into a wrong integer because of the influence of code hardware delay and observation noise.In this paper BDS triple-frequency observation and GIM production are applied to resolve wide-lane ambiguity with a fixed EWL ambiguity and phase geometry-free (GF) combination.In addition,high-precise ionospheric delay is reconstructed and code hardware delay is separated.Test results show that the wide-lane ambiguity fixing success rate rises to 100% when assisted with GIM information,while the ambiguity is free of systemic bias.There is a difference of about 1.0m between the reconstructed ionospheric delay and GIM corrections,meaning an equivalent precision of 6 TECU.The standard deviation of the separated code hardware delay is less than 0.3 m.
引文
[1]He Haibo.Precise Kinematic GPS Surveying and Quality Control[D].Zhengzhou:Information Engineering University,2002(何海波.高精度GPS动态测量及质量控制[D].郑州:信息工程大学,2002)
[2]Yuan Yunbin.Study on Theories and Method of Correcting Ionopheric Delay and Monitoring Ionosphere Based on GPS[D].Wuhan:Institute of Geodesy and Geophysics Chinese Academy of Sciences,2002(袁运斌.基于GPS的电离层监测及延迟改正的理论与方法的研究[D].武汉:中国科学院研究生院,2002)
[3]Zhang Hongping.Study on Method of Correcting Ionopheric Delay and Ionosphere Monitoring in Chinese Region Based on GPS[D].Shanghai:Shanghai Observatory Chinese Academy of Sciences,2006(章红平.基于地基GPS的中国区域电离层监测与延迟改正研究[D].上海:中国科学院上海天文台,2006)
[4]H-Pajares M,Juan J M,Sanz J.The IGS VTEC Maps A Reliable Source of Ionospheric Information Since1998[J].J Geod,2009,83(11):263-275
[5]Ruan Rengui,Wu Xianbing,Feng Laiping,et al.Single-Frequency Precise Point Positioning with Simultaneous Ionospheric Delay Estimation[J].Acta Geodaetica et Cartographica Sinica,2012,41:(4):490-495(阮仁桂,吴显兵,冯来平,等.同时估计电离层延迟的单频精密单点定位方法[J].测绘学报,2012,41(4):490-495)
[6]Deng Jian,Pan Shuguo,Hong Zhuozhong.A Resolution Method for Ionospheric Delay with Optimal Combination of Three-frequency Data[J].Geomatics and Information Science of Wuhan University,2014,39(5):600-604(邓健,潘树国,洪卓众.利用三频数据最优组合求解电离层延迟的方法[J].武汉大学学报·信息科学版,2014,39(5):600-604)
[7]Li Bofeng,Shen Yunzhong,Zhou Zebo.A New Method for Medium and Long Rang Three Frequency GNSS Rapid Ambiguity Resolution[J].Acta Geodaetica et Cartographica Sinica,2009,38(4):296-301(李博峰,沈云中,周泽波.中长基线三频GNSS模糊度的快速算法[J].测绘学报,2009,38(4):296-301)
[8]Li Jinglong.BDS/GPS Multi-frequency Real-time Kinematic Positioning Theory and Algorithms[D].Zhengzhou:Information Engineering University,2014(李金龙.北斗GPS多频实时精密定位理论与算法[D].郑州:信息工程大学,2014)
[9]Wang Huarun,Chai Hongzhou,Xie Kai.Study of Cycle-Slip Detection Using BDS Triple-frequency Geometry-Free and Ionosphere-Free Combination[J].Journal of Geodesy and Geodynamics,2015,35(3):406-411(王华润,柴洪洲,谢恺.北斗三频无几何、消电离层组合周跳探测方法研究[J].大地测量与地球动力学,2015,35(3):406-411)
[10]Xie Kai.Research on Ambiguity Resolution Based on BDS Triple-frequency[D].Zhengzhou:Information Engineering University,2014(谢恺.基于北斗三频的模糊度解算方法研究[D].郑州:信息工程大学,2014)
[11]Yanming F.GNSS Three Carrier Ambiguity Resolution Using Ionosphere-reduced Virtual Signals[J].Journal of Geodesy,2008,82:847-862
[12]Spits J,Warnant R.Total Electron Content Monitoring Using Triple Frequency GNSS:Results with Giove-A/-B data[J].Adv Space Res.,2011,47:296-303
[2]Yuan Yunbin.Study on Theories and Method of Correcting Ionopheric Delay and Monitoring Ionosphere Based on GPS[D].Wuhan:Institute of Geodesy and Geophysics Chinese Academy of Sciences,2002(袁运斌.基于GPS的电离层监测及延迟改正的理论与方法的研究[D].武汉:中国科学院研究生院,2002)
[3]Zhang Hongping.Study on Method of Correcting Ionopheric Delay and Ionosphere Monitoring in Chinese Region Based on GPS[D].Shanghai:Shanghai Observatory Chinese Academy of Sciences,2006(章红平.基于地基GPS的中国区域电离层监测与延迟改正研究[D].上海:中国科学院上海天文台,2006)
[4]H-Pajares M,Juan J M,Sanz J.The IGS VTEC Maps A Reliable Source of Ionospheric Information Since1998[J].J Geod,2009,83(11):263-275
[5]Ruan Rengui,Wu Xianbing,Feng Laiping,et al.Single-Frequency Precise Point Positioning with Simultaneous Ionospheric Delay Estimation[J].Acta Geodaetica et Cartographica Sinica,2012,41:(4):490-495(阮仁桂,吴显兵,冯来平,等.同时估计电离层延迟的单频精密单点定位方法[J].测绘学报,2012,41(4):490-495)
[6]Deng Jian,Pan Shuguo,Hong Zhuozhong.A Resolution Method for Ionospheric Delay with Optimal Combination of Three-frequency Data[J].Geomatics and Information Science of Wuhan University,2014,39(5):600-604(邓健,潘树国,洪卓众.利用三频数据最优组合求解电离层延迟的方法[J].武汉大学学报·信息科学版,2014,39(5):600-604)
[7]Li Bofeng,Shen Yunzhong,Zhou Zebo.A New Method for Medium and Long Rang Three Frequency GNSS Rapid Ambiguity Resolution[J].Acta Geodaetica et Cartographica Sinica,2009,38(4):296-301(李博峰,沈云中,周泽波.中长基线三频GNSS模糊度的快速算法[J].测绘学报,2009,38(4):296-301)
[8]Li Jinglong.BDS/GPS Multi-frequency Real-time Kinematic Positioning Theory and Algorithms[D].Zhengzhou:Information Engineering University,2014(李金龙.北斗GPS多频实时精密定位理论与算法[D].郑州:信息工程大学,2014)
[9]Wang Huarun,Chai Hongzhou,Xie Kai.Study of Cycle-Slip Detection Using BDS Triple-frequency Geometry-Free and Ionosphere-Free Combination[J].Journal of Geodesy and Geodynamics,2015,35(3):406-411(王华润,柴洪洲,谢恺.北斗三频无几何、消电离层组合周跳探测方法研究[J].大地测量与地球动力学,2015,35(3):406-411)
[10]Xie Kai.Research on Ambiguity Resolution Based on BDS Triple-frequency[D].Zhengzhou:Information Engineering University,2014(谢恺.基于北斗三频的模糊度解算方法研究[D].郑州:信息工程大学,2014)
[11]Yanming F.GNSS Three Carrier Ambiguity Resolution Using Ionosphere-reduced Virtual Signals[J].Journal of Geodesy,2008,82:847-862
[12]Spits J,Warnant R.Total Electron Content Monitoring Using Triple Frequency GNSS:Results with Giove-A/-B data[J].Adv Space Res.,2011,47:296-303