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Present-day movement characteristics of the Qinghai Nanshan fault and its surrounding area from GPS observation

Geodesy and Geodynamics 2024年第2期15卷 133-141页

作者： Yang Liu Yuxuan Qiu Jialiang Liu Luyun Xiong Caijun Xu jianghui geng Gang Zheng Tianchen Sheng School of Geodesy and Geomatics Wuhan UniversityWuhan 430079China Key Laboratory of Geospace Environment and Geodesy Ministry of EducationWuhan UniversityWuhan 430079China Key Laboratory of Geophysical Geodesy Ministry of Natural ResourcesWuhan UniversityWuhan 430079China GNSS Research Center Wuhan UniversityWuhan 430079China School of Earth and Environment University of LeedsLeeds LS29JTUK Qinghai Basic Surveying and Mapping Institute Xining 810101China

The Qinghai Nanshan fault is a larger fault in the Northeastern Xizang Plateau.In previous studies,its movement characteristics are mainly investigated with geological and seismic observations,and the tectonic transformation role of the fault on its east is not yet clear.This study uses data fusion to obtain denser GPS observations near the Qinghai Nanshan fault.Based on tectonic characteristics,we establish a block model to investigate the fault slip rate,locking degree,and slip deficit.The results show that the Qinghai Nanshan fault slip rate is characterized by sinistral and convergent movement.Both the sinistral and convergent rates display a decreasing trend from west to east.The locking degree and slip deficit are higher in the western segment(with an average of about 0.74 and 1.1 mm/a)and lower in the eastern segment.Then,we construct a strain rate field using GPS observations to analyze the regional strain characteristics.The results indicate that along the fault,the western segment shows a larger shear strain rate and negative dilation rate.Regional earthquake records show that the frequency of earthquakes is lower near the fault.The joint results suggest that the western segment may have a higher earthquake risk.In addition,the insignificant fault slip rate in the eastern segment may indicate that it does not participate in the tectonic transformation among the Riyueshan,Lajishan,and West Qinling faults.

关键词： The Qinghai Nanshan fault Movement characteristics Block model Slip rate GPS

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Observable-specific phase biases of Wuhan multi-GNSS experiment analysis center’s rapid satellite products

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Satellite Navigation 2022年第3期3卷 91-105,I0003页

作者： jianghui geng Qiyuan Zhang Guangcai Li Jingnan Liu Donglie Liu GNSS Research Center Wuhan University129 Luoyu RoadWuhan430079China Hubei Luojia Laboratory Wuhan University129 Luoyu RoadWuhan430079China Natural Resources Satellite Remote Sensing Application Center 242 Zhonghuabei RoadGuiyang550004China

Precise Point Positioning(PPP)with Ambiguity Resolution(AR)is an important high-precision positioning technique that is gaining popularity in geodetic and geophysical applications.The implementation of PPP-AR requires precise products such as orbits,clocks,code,and phase biases.As one of the analysis centers of the International Global Navigation Satellite System(GNSS)Service(IGS),the Wuhan University Multi-GNSS experiment(WUM)Analysis Center(AC)has provided multi-GNSS Observable-Specific Bias(OSB)products with the associated orbit and clock products.In this article,we first introduce the models and generation strategies of WUM rapid phase clock/bias products and orbit-related products(with a latency of less than 16 h).Then,we assess the performance of these products by comparing them with those of other ACs and by testing the PPP-AR positioning precision,using data from Day of the Year(DOY)047 to DOY 078 in 2022.It is found that the peak-to-peak value of phase OSBs is within 2 ns,and their fluctuations are caused by the clock day boundary discontinuities.The associated Global Positioning System(GPS)orbits have the best consistency with European Space Agency(ESA)products,and those of other systems rank in the medium place.GLObal NAvigation Satellite System(GLONASS)clocks show slightly inconsistency with other ACs’due to the antenna thrust power adopted,while the phase clocks of other GNSSs show no distortion compared with legacy clocks.With well-estimated phase products for Precise Orbit Determination(POD),the intrinsic precision is improved by 14%,17%,and 24%for GPS,Galileo navigation satellite system(Galileo),and BeiDou-3 Navigation Satellite System(BDS-3),respectively.The root mean square of PPP-AR using our products in static mode with respect to IGS weekly solutions can reach 0.16 cm,0.16 cm,and 0.44 cm in the east,north,and up directions,respectively.The multi-GNSS wide-lane ambiguity fixing rates are all above 90%,while the narrow-lane fixing rates above 80%.In conclusion,the phase OSB products at WUM have

关键词： Multi global navigation satellite system Observable-specific phase bias Precise point positioning with ambiguity resolution Wuhan University multi-GNSS experiment analysis center Precise orbit determination

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Precise orbit determination of Haiyang‑2D using onboard BDS‑3 B1C/B2a observations with ambiguity resolution

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Satellite Navigation 2023年第3期4卷 167-184页

作者： Kecai Jiang Wenwen Li Min Li jianghui geng Haixia Lyu Qile Zhao Jingnan Liu GNSS Research Center Wuhan University129 Luoyu RoadWuhan 430079China Key Laboratory of Space Ocean Remote Sensing and Application Ministry of Natural Resources8 Dahui Temple RoadBeijing 10081China Collaborative Innovation Center of Geospatial Technology 129 Luoyu RoadWuhan 430079China Department of Land Surveying and Geo‑Informatics The Hong Kong Polytechnic University11 Yuk Choi RoadHung HomKowloonHong KongChina

The Haiyang-2D altimetry mission of China is one of the first Low Earth Orbit(LEO)satellites that can receive new B1C/B2a signals from the BeiDou-3 Navigation Satellite System(BDS-3)for Precise Orbit Determination(POD).In this work,the achievable accuracy of the single-receiver ambiguity resolution for onboard LEO satellites is studied based on the real measurements of new BDS-3 frequencies.Under normal conditions,six BDS-3 satellites on average are visible.However,the multipath of the B1C/B2a code observations presents some patchy patterns that cause near-field variations with an amplitude of approximately 40 cm and deteriorate the ambiguity-fixed rate.By modeling those errors,for the B2a code,a remarkable reduction of 53%in the Root Mean Square(RMS)is achieved at high elevations,along with an increase of 8%in the ambiguity-fixed rates.Additionally,an analysis of the onboard antenna’s phase center offsets reveals that when compared to the solutions with float ambiguities,the estimated values in the antenna’s Z direction in the solutions with fixed ambiguities are notably smaller.The independent validation of the resulting POD using satellite laser ranging at 16 selected high-performance stations shows that the residuals are reduced by a minimum of 15.4%for ambiguity-fixed solutions with an RMS consistency of approximately 2.2 cm.Furthermore,when compared to the DORIS-derived orbits,a 4.3 cm 3D RMS consistency is achieved for the BDS-3-derived orbits,and the along-track bias is reduced from 2.9 to 0.4 cm using ambiguity fixing.

关键词： Ambiguity resolution B1C/B2a Onboard BDS-3 Precise orbit determination Haiyang-2D

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

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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 correction.In 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 azimuth.Both 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 azimuth.Thus,Q4DIM presents a resilient model that is capable for both wide-area coverage and high precision.Four different sets of clusters are defined to illustrate the properties of Q4DIM based on 200 EUREF Permanent Network(EPN)stations.The results indicate that Q4DIM is compatible with the GIM products.Moreover,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 TECU.In 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)service.Finally,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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Assessing IGS GPS/Galileo/BDS-2/BDS-3 phase bias products with PRIDE PPP-AR

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Satellite Navigation 2021年第1期2卷 238-252页

作者： jianghui geng Songfeng Yang Jiang Guo GNSS Research Center Wuhan UniversityWuhanChina

Ambiguity Resolution in Precise Point Positioning (PPP-AR) is important to achieving high-precision positioning in wide areas. The International GNSS (Global Navigation Satellite System) Service (IGS) and some other academic organizations have begun to provide phase bias products to enable PPP-AR, such as the integer-clock like products by Centre National d’Etudes Spatials (CNES), Wuhan University (WUM) and the Center for Orbit Determination in Europe (CODE), as well as the Uncalibrated Phase Delay (UPD) products by School of Geodesy and Geomatics (SGG). To evaluate these disparate products, we carry out Global Positioning System (GPS)/Galileo Navigation Satellite System (Galileo) and BeiDou Navigation Satellite System (BDS-only) PPP-AR using 30 days of data in 2019. In general, over 70% and 80% of GPS and Galileo ambiguity residuals after wide-lane phase bias corrections fall in ± 0.1 cycles, in contrast to less than 50% for BeiDou Navigation Satellite (Regional) System (BDS-2);moreover, around 90% of GPS/Galileo narrow-lane ambiguity residuals are within ± 0.1 cycles, while the percentage drops to about 55% in the case of BDS products. GPS/Galileo daily PPP-AR can usually achieve a positioning precision of 2, 2 and 6 mm for the east, north and up components, respectively, for all phase bias products except those based on German Research Centre for Geosciences (GBM) rapid satellite orbits and clocks. Due to the insufficient number of BDS satellites during 2019, the BDS phase bias products perform worse than the GPS/Galileo products in terms of ambiguity fixing rates and daily positioning precisions. BDS-2 daily positions can only reach a precision of about 10 mm in the horizontal and 20 mm in the vertical components, which can be slightly improved after PPP-AR. However, for the year of 2020, BDS-2/BDS-3 (BDS-3 Navigation Satellite System) PPP-AR achieves about 50% better precisions for all three coordinate components.

关键词： Precise point positioning Phase bias products Ambiguity resolution Multi-GNSS

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The Progress of IGS Analysis Center at Wuhan University

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Journal of Geodesy and Geoinformation Science 2023年第3期6卷 46-57页

作者： Weiping JIANG Qile ZHAO Min LI Jing GUO jianghui geng Zhao LI Shengfeng GU Qiang ZHANG Zhigang HU Na WEI GNSS Research Center Wuhan UniversityWuhan 430079China

As one of the Analysis Centers(AC)of the International GNSS Service(IGS),Wuhan University(WHU)has been contributing to the IGS by providing ultra-rapid as well as rapid orbit and clock solutions for the established GPS and GLONASS since 2012.In the same year,the IGS initiated the Multi-GNSS Experiment(MGEX)to support the analysis of the emerging GNSS systems and prepare the IGS for Multi-GNSS,which includes GPS,GLONASS,the European Galileo system,the Chinese Beidou Navigation Satellite System(BDS),the Japanese Quasi-Zenith Satellite System(QZSS)and the Indian Regional Navigation Satellite System(IRNSS/NaVIC).The major products,i.e.,orbits,Earth Orientation Parameters(EOPs),satellite clock as well as attitude have also been provided by WHU since 2012.More recently,WHU has engaged the third reprocessing of IGS for generating the highly accurate station coordinates as inputs for establishment of the International Terrestrial Reference Frame(ITRF)2020 during 2019—2020.This article presents the recent major advancements of the IGS AC at Wuhan University,including precise products,real-time products,bias products,antenna phase center calibration,and the non-linear motion modeling for GNSS Reference Stations.

关键词： GNSS BDS International GNSS Service orbit and clock products non-linear motion

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低轨卫星精密运动学定轨性能差异分析

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测绘地理信息 2024年第1期49卷 1-9,I0001页

作者：耿江辉曾竞赵磊武汉大学卫星导航定位技术研究中心湖北武汉430079 湖北珞珈实验室湖北武汉430079

基于全球导航卫星系统(global navigation satellite system,GNSS),采用精密单点定位(precise point positioning,PPP)技术的低轨卫星运动学定轨是广泛研究的热点。然而不同低轨卫星搭载星载接收机性能不同,基于其星载GNSS数据的运动学... 详细信息

基于全球导航卫星系统(global navigation satellite system,GNSS),采用精密单点定位(precise point positioning,PPP)技术的低轨卫星运动学定轨是广泛研究的热点。然而不同低轨卫星搭载星载接收机性能不同,基于其星载GNSS数据的运动学定轨效果也会有所差异。本文首先介绍了GARCE-FO卫星和Swarm卫星及其星载接收机,然后从观测卫星数、伪距多路径以及信号强度对比其数据质量差异,最后基于武汉大学开源的PIRDE PPP-AR软件解算其相应的运动学轨道进行对比。结果表明,GRACE-FO卫星相比Swarm卫星可观测到的GNSS卫星数更多,其各自的伪距多路径分别为0.16~0.19m和0.3~0.44m,并且GRACE-FO卫星的信号强度分布6~9之间,而Swarm卫星L2频率上的信号强度分布在1~7之间。综合来说,Swarm卫星的观测数据质量劣于GRACE-FO。此外,GRACE-FO卫星的模糊度残差表现出良好的近正态分布特性,宽巷模糊度和窄巷模糊度的固定率可达99%和93%,而Swarm卫星的窄巷模糊度残差则分布不规则。与权威机构发布的精密科学轨道对比,GRACE-C在切向、法向和径向3个分量固定解的轨道精度分别为1.39cm、0.98cm和2.59cm,GRACE-D卫星轨道精度与GRACE-C卫星整体一致;Swarm卫星各分量的运动学轨道精度则在3~4 cm左右,相较于GRACE-FO卫星要低1~2 cm。在平差解算时降低参数之间的相关性能有效提高参数估值的精度,使用随机游走估计GRACE-FO卫星的接收机钟差来相较于白噪声在径向分量上有60%左右的提升。此外,欧洲定轨中心(Center for Orbit Determination in Europe,CODE)发布的Swarm卫星运动学轨道以简化动力学解算得到的模糊度作为约束来降低参数相关性,相较于本文解算的运动学轨道在径向分量上也有一定的提升。

关键词：低轨卫星运动学定轨数据质量对比精密单点定位

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Development of Six-Degree-of-Freedom GNSS Seismometer

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Earthquake Research in China 2020年第3期34卷 307-310页

作者： geng jianghui WEN Qiang ZHANG Tisheng GNSS Research Center Wuhan UniversityWuhan 430072China

1 THE DEFICIENCY OF OBSERVATION TECHNIQUES ON STRONG NEARFIELD EARTHQUAKES Catastrophic earthquakes often result in huge loss on people s lives and property.Therefore,techniques concerning earthquake prevention and disaster reduction are closely related to citizens livelihood. It requires that seismologists master the mechanisms of seismic hazards,and perform timely w arning for earthquakes. Unfortunately.

关键词： Development of Six-Degree-of-Freedom GNSS Seismometer

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SMAG2000:一体化GNSS强震仪及其地震监测性能分析

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武汉大学学报（信息科学版） 2023年第3期48卷 443-452页

作者：曾燃耿江辉辛绍铭张琦武汉大学卫星导航定位技术研究中心武汉430079

地震监测可以帮助人们了解地震形成的机制,对地震预警也有着重要意义。结合加速度计和全球导航卫星系统(global navigation satellite system,GNSS)高精度数据处理方法,利用嵌入式开发技术,研制了一体化GNSS强震仪SMAG2000用于实时地震... 详细信息

地震监测可以帮助人们了解地震形成的机制,对地震预警也有着重要意义。结合加速度计和全球导航卫星系统(global navigation satellite system,GNSS)高精度数据处理方法,利用嵌入式开发技术,研制了一体化GNSS强震仪SMAG2000用于实时地震监测。该仪器具有以下特点:(1)将GNSS与加速度计数据融合,仪器没有量程限制,并可以获得永久位移。(2)通过振动台测试,对不同频率的正弦波和模拟的地震波信号,仪器测量的结果与参考值残差的标准差优于0.4 cm,相关系数大于0.99。(3)所使用的核心组件与配件均为国产,成本可控,可以在中国地震监测网实施布设,实现地震台网和大地测量台网的深度融合,响应《国家地震科技创新工程》。

关键词：实时精密单点定位数据融合地震监测

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Research on Electronic and Electrical Architecture Design Based on SOA

Research on Electronic and Electrical Architecture Design Ba...

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2022中国汽车工程学会年会暨展览会

作者： geng Zhicheng Sun jianghui Feng Shuo Zhang Zhaolong Beijing Automotive Technology Center Co. Ltd.

The paper takes the electronic and electrical architecture based on SOA as the research object.Firstly,the architecture of electrical development based on SOA is introduced;secondly,it focuses on the development process and methods in the SOA architecture design stage,guided by scenarios and functions,it studies the methods of function implementation design,service design and development and communication design and development;finally,it describes the development content and work in the development and verification stage of SOA architecture.

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