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Quasi-4-dimension ionospheric modeling and its application in PPP

Satellite Navigation 2022年第3期3卷 207-220,I0005页

作者： Shengfeng Gu Chengkun Gan Chengpeng He Haixia Lyu manuel hernandez-pajares Yidong Lou Jianghui Geng Qile Zhao GNSS Research Center Wuhan University129 Luoyu RoadWuhan430079China Hubei Luojia Laboratory Wuhan University129 Luoyu RoadWuhan430079China UPC-IonSAT/IEEC-UPC UPC Mod.C3 Campus Nord UPCc/Jordi Girona 1-3BarcelonaSpain

Ionospheric delay modeling is not only important for Global Navigation Satellite System(GNSS)based space weather study and monitoring,but also an efficient tool to speed up the convergence time of Precise Point Positioning(PPP).In this study,a novel model,denoted as Quasi-4-Dimension Ionospheric Modeling(Q4DIM)is proposed for wide-area high precision ionospheric delay *** Q4DIM,the Line Of Sight(LOS)ionospheric delays from a GNSS station network are divided into different clusters according to not only the location of latitude and longitude,but also satellite elevation and *** Global Ionosphere Map(GIM)and Slant Ionospheric Delay(SID)models that are traditionally used for wide-area and regional ionospheric delay modeling,respectively,can be regarded as the special cases of Q4DIM by defining proper grids in latitude,longitude,elevation,and ***,Q4DIM presents a resilient model that is capable for both wide-area coverage and high *** different sets of clusters are defined to illustrate the properties of Q4DIM based on 200 EUREF Permanent Network(EPN)*** results indicate that Q4DIM is compatible with the GIM ***,it is proved that by inducting the elevation and azimuth angle dependent residuals,the precision of the 2-dimensional GIM-like model,i.e.,Q4DIM 2-Dimensional(Q4DIM-2D),is improved from around 1.5 Total Electron Content Units(TECU)to better than 0.5 *** addition,treating Q4DIM as a 4-dimensional matrix in latitude,longitude,elevation,and azimuth,whose sparsity is less than 5%,can result in its feasibility in a bandwidth-sensitive applications,e.g.,satellite-based Precising Point Positioning Real-Time Kinematic(PPP-RTK)***,the advantages of Q4DIM in PPP over the 2-dimensional models are demonstrated with the one month's data from 30 EPN stations in both high solar activity year 2014 and low solar activity year 2020.

关键词： Undifferenced and uncombined observation Ionosphere delay modeling PPP Design Wide-area

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Status of CAS global ionospheric maps after the maximum of solar cycle 24

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Satellite Navigation 2021年第1期2卷 263-277页

作者： Zishen Li Ningbo Wang Ang Liu Yunbin Yuan Liang Wang manuel Hernández-pajares Andrzej Krankowski Hong Yuan Aerospace Information Research Institute(AIR) Chinese Academy of Sci-ences(CAS)BeijingChina State Key Laboratory of Geodesy and Earth’s Dynamics Innovation Academy of Precision Measurement Science and Technology(APM)CASWuhanChina University of Chinese Academy of Sciences(UCAS) BeijingChina Universitat Politècnica de Catalunya(UPC-IonSAT IEEC)BarcelonaSpain Space Radio-Diagnostics Research Centre(SRRC) University of Warmia and Mazury(UWM)in OlsztynOlsztynPoland.

As a new Ionosphere Associate Analysis Center(IAAC)of the International GNSS Service(IGS),Chinese Academy of Sciences(CAS)started the routine computation of the real-time,rapid,and final Global Ionospheric Maps(GIMs)in *** method for the generation of CAS rapid and final GIMs and recent updates are presented in the *** quality of CAS post-processed GIMs is assessed during 2015-2018 after the maximum of solar cycle *** perform an independent and fair assessment,Jason-2/3 Vertical Total Electron Contents(VTEC)are first used as the references over the *** differential Slant TECs(dSTEC)generated from 55 Multi-GNSS Experimental(MGEX)stations of the IGS are also employed,which provides a complementing way to evaluate the ability of electron content models to reproduce the spatial and temporal gradients in the *** the test period,Jet Propulsion Laboratory(JPL)GIMs present significantly positive deviations compared to the Jason VTEC and GPS *** University of Catalonia(UPC)rapid GIM UQRG exhibits the best performance in both Jason VTEC and GPS dSTEC *** CAS GIMs show comparable performance with the results of the first four IAACs of the *** expected,the poor performance of all GIMs is in equatorial regions and the high latitudes of the southern *** consideration of generating multi-layer or three-dimensional ionospheric maps is emphasized to mitigate the inadequacy of ionospheric single-layer assumption in the presence of pronounced latitudinal *** use of ionospheric observations from the new GNSS constellations and other space-or ground-based observation techniques is also suggested in the generation of future GIMs,given the sparse GPS/GLONASS stations in the southern hemisphere.

关键词： International GNSS Service(IGS) Global ionospheric map(GIM) Total electron content(TEC) Jason-2/3 Differential Slant TEC(dSTEC)

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西班牙ldrisi精品店

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现代装饰 2013年第12期 72-77页

作者： Gerard Sanmarti Gabriele Schiavon Gemma Fletcher José manuel Fernández Marin Maria Ruíz Ulibarr Cristian Mann Olga pajares Laie Prades Marilo Vila Eugènia Prun 姜敏华 Kontraluz studio lagranja design

除了单一的品牌商店和百货公司外，依然存在着真正的精品店。Idrisi作为西班牙北部最好的精品店之一，顾客们可以在这里尽情挑选来自意大利和法国的时尚品牌，如Prada、Gucci、Yves SaintLaurentDior等。此次，Lagranja的设计对毕尔巴... 详细信息

除了单一的品牌商店和百货公司外，依然存在着真正的精品店。Idrisi作为西班牙北部最好的精品店之一，顾客们可以在这里尽情挑选来自意大利和法国的时尚品牌，如Prada、Gucci、Yves SaintLaurentDior等。此次，Lagranja的设计对毕尔巴鄂这座城市的服装店改革有着举足轻重的作用。

关键词：精品店西班牙时尚品牌百货公司毕尔巴鄂意大利服装店商店

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