GPS与格洛纳斯电离层电子总含量建模的差异性分析及改进
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摘要
为了提高多模GNSS(global navigation satellite system)电离层电子总含量(TEC)的计算精度,基于全球及中国区域研究了GPS(global positioning system)TEC和GLONASS(global orbiting navigation satellite system)TEC的差异及变化规律.GPS TEC精度要优于GLONASS TEC,两者相关性随纬度降低而降低,并且GLONASS TEC较之GPS TEC存在一定程度的低估;TEC精度差异与星座配置、信号体制及轨道周期差异有关,并受到本地时影响,F2层临界频率(foF2)存在类似情况.基于GPS TEC和GLONASS TEC的差异性,对组合建模时伪距观测权函数进行改进,平均偏差约改进20%,内符精度约改进15%.
To improve the total electron content(TEC) accuracy retrieved by multi-mode GNSS(global navigation satellite system), this paper addresses the distinctions of TEC retrieved from GPS(global positioning system) and GLONASS(global orbiting navigation satellite system) using global and Chinese GNSS stations. It indicates that TEC retrieved from GPS is more accurate than that from GLONASS. The regional model results in China show that the GPS/GLONASS TEC correlation coefficients increase with latitude and GLONASS underestimates TEC compared with GPS. The difference has the relationship with constellation configuration, signal system and orbit design difference. The TEC difference has latitude and local time dependency, and critical frequency of F2 layer(foF2) has similar phenomena with local time and geographic latitude dependency. Based on the study, a newly weighting function is designed for GLONASS measurements. The results show that the method will improve the bias and the root mean square(RMS) by 15% and 20% respectively in GPS and GLONASS combine mode.
To improve the total electron content(TEC) accuracy retrieved by multi-mode GNSS(global navigation satellite system), this paper addresses the distinctions of TEC retrieved from GPS(global positioning system) and GLONASS(global orbiting navigation satellite system) using global and Chinese GNSS stations. It indicates that TEC retrieved from GPS is more accurate than that from GLONASS. The regional model results in China show that the GPS/GLONASS TEC correlation coefficients increase with latitude and GLONASS underestimates TEC compared with GPS. The difference has the relationship with constellation configuration, signal system and orbit design difference. The TEC difference has latitude and local time dependency, and critical frequency of F2 layer(foF2) has similar phenomena with local time and geographic latitude dependency. Based on the study, a newly weighting function is designed for GLONASS measurements. The results show that the method will improve the bias and the root mean square(RMS) by 15% and 20% respectively in GPS and GLONASS combine mode.
引文
[1] COSTER A,GAPOSCHKIN E,THORNTON L.Real-time ionospheric monitoring system using GPS[J].Navigation,1992,39(2):191.
[2] ANGHEL A,CARRANO C,KOMJATHY A,et al.Kalman filter-based algorithms for monitoring the ionosphere and plasmasphere with GPS in near-real time[J].Journal of Atmospheric and Solar-Terrestrial Physics,2009,71(1):158.
[3] 谢益炳,伍吉仓,陈俊平,等.GPS和GLONASS组合的全球实测电离层TEC建模[J].武汉大学学报:信息科学版,2014,39(8):930.XIE Yibing,WU Jicang,CHEN Junping,et al.Global ionospheric TEC modeling using measured GPS and GLONASS[J].Geomatics and Information Science of Wuhan University,2014,39(8):930.
[4] 陈鹏,陈家君.GPS/GLONASS融合的全球电离层格网模型结果分析[J].大地测量与地球动力学,2014,34(5):70.CHEN Peng,CHEN Jiajun.Analysis of global ionospheric grid model integrated GPS/GLONASS[J].Journal of Geodesy and Geodynamic,2014,34(5):70.
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[6] SHAGIMURATOV I,VHERNYAK Y,ZAKHARENKOVA I,et al.Use of GLONASS for studying the ionosphere[J].Russian Journal of Physical Chemistry,2015,9(5):770.
[7] BIRCH M J,HARGREAVES J K,BAILEY G J.On the use of an effective ionospheric height in electron content measurement by GPS reception[J].Radio Science,2002,37(1):15.
[8] BLEWITT G.An automatic editing algorithm for GPS data[J].Geophysical Research Letters,1990,17(3):199.
[9] MEGGS R W,MITCHELL C N.A study into the errors in vertical total electron content mapping using GPS data[J].Radio Science,2006,41(1):8.
[10] RRAMA R,NIRANJAN K.On the validity of the ionospheric pierce point (IPP) altitude of 350 km in the Indian equatorial and low-latitude sector[J].Annals of Geophysics,2006,24:2159.
[11] SMITH D A,ARAUJO-PRADERE E A,MINTER C,et al.A comprehensive evaluation of the errors inherent in the use of a two-dimensional shell for modeling the ionosphere[J].Radio Science,2008,43(6):23.
[12] LI L X,ZHANG D H,ZHANG S R,et al.Influences of the day-night differences of ionospheric variability on the estimation of GPS differential code bias[J].Radio Science,2015,50:339.
[13] 薛军琛,宋淑丽,朱文耀,等.区域GPS网实测电离层变化和卫星硬件延迟的可靠性研究[J].天文学报,2012,36:73.XUE Junchen,SONG Shuli,ZHU Wenyao,et al.A study on the reliability of the ionospheric VTEC and satellite DCB derived from regional GPS network[J].Chinese Astronomy and Astrophysics,2012,36:73.
[14] VHERNYAK Y,MYLNIKOVA A,KUNITSYNC V.Influence of GPS/GLONASS differential code biases on the determination accuracy of the absolute total electron content in the ionosphere[J].Geomagnetism and Aeronomy,2015,55(6):763.
[15] SINGH A K,SARDAR N,RIZVI S,et al.Night time enhancement of ionospheric parameters [J].Indian Journal of Radio & Space Physics,2013,42:240.
[2] ANGHEL A,CARRANO C,KOMJATHY A,et al.Kalman filter-based algorithms for monitoring the ionosphere and plasmasphere with GPS in near-real time[J].Journal of Atmospheric and Solar-Terrestrial Physics,2009,71(1):158.
[3] 谢益炳,伍吉仓,陈俊平,等.GPS和GLONASS组合的全球实测电离层TEC建模[J].武汉大学学报:信息科学版,2014,39(8):930.XIE Yibing,WU Jicang,CHEN Junping,et al.Global ionospheric TEC modeling using measured GPS and GLONASS[J].Geomatics and Information Science of Wuhan University,2014,39(8):930.
[4] 陈鹏,陈家君.GPS/GLONASS融合的全球电离层格网模型结果分析[J].大地测量与地球动力学,2014,34(5):70.CHEN Peng,CHEN Jiajun.Analysis of global ionospheric grid model integrated GPS/GLONASS[J].Journal of Geodesy and Geodynamic,2014,34(5):70.
[5] JAKOWSKI N,HEISE S,WEHRENPFENNING A,et al.GPS/GLONASS-based TEC measurements as a contributor for space weather forecast[J].Journal of Atmospheric and Solar-Terrestrial Physics,2002,64:729.
[6] SHAGIMURATOV I,VHERNYAK Y,ZAKHARENKOVA I,et al.Use of GLONASS for studying the ionosphere[J].Russian Journal of Physical Chemistry,2015,9(5):770.
[7] BIRCH M J,HARGREAVES J K,BAILEY G J.On the use of an effective ionospheric height in electron content measurement by GPS reception[J].Radio Science,2002,37(1):15.
[8] BLEWITT G.An automatic editing algorithm for GPS data[J].Geophysical Research Letters,1990,17(3):199.
[9] MEGGS R W,MITCHELL C N.A study into the errors in vertical total electron content mapping using GPS data[J].Radio Science,2006,41(1):8.
[10] RRAMA R,NIRANJAN K.On the validity of the ionospheric pierce point (IPP) altitude of 350 km in the Indian equatorial and low-latitude sector[J].Annals of Geophysics,2006,24:2159.
[11] SMITH D A,ARAUJO-PRADERE E A,MINTER C,et al.A comprehensive evaluation of the errors inherent in the use of a two-dimensional shell for modeling the ionosphere[J].Radio Science,2008,43(6):23.
[12] LI L X,ZHANG D H,ZHANG S R,et al.Influences of the day-night differences of ionospheric variability on the estimation of GPS differential code bias[J].Radio Science,2015,50:339.
[13] 薛军琛,宋淑丽,朱文耀,等.区域GPS网实测电离层变化和卫星硬件延迟的可靠性研究[J].天文学报,2012,36:73.XUE Junchen,SONG Shuli,ZHU Wenyao,et al.A study on the reliability of the ionospheric VTEC and satellite DCB derived from regional GPS network[J].Chinese Astronomy and Astrophysics,2012,36:73.
[14] VHERNYAK Y,MYLNIKOVA A,KUNITSYNC V.Influence of GPS/GLONASS differential code biases on the determination accuracy of the absolute total electron content in the ionosphere[J].Geomagnetism and Aeronomy,2015,55(6):763.
[15] SINGH A K,SARDAR N,RIZVI S,et al.Night time enhancement of ionospheric parameters [J].Indian Journal of Radio & Space Physics,2013,42:240.
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