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igmas GNSS钟差产品综合与评估

测绘学报 2016年第S2期45卷 46-53页

作者：陈康慷徐天河杨玉国蔡洪亮陈国长安大学地质工程与测绘学院陕西西安710054 苏黎世联邦理工学院大地测量与摄影测量研究所山东大学空间科学研究院山东威海264209 地理信息工程国家重点实验室陕西西安710054 北京跟踪与通信技术研究所北京100094 武汉大学测绘学院湖北武汉430079

高精度卫星导航定位离不开精密钟差改正信息,钟差产品综合与评估是产品综合与服务中心(ISC)的重要任务之一。本文首先介绍了ISC钟差产品综合策略和抗差估计方法,重点阐述了非线性系统误差处理、钟差参考基准统一及残余线性偏差补偿;然后... 详细信息

高精度卫星导航定位离不开精密钟差改正信息,钟差产品综合与评估是产品综合与服务中心(ISC)的重要任务之一。本文首先介绍了ISC钟差产品综合策略和抗差估计方法,重点阐述了非线性系统误差处理、钟差参考基准统一及残余线性偏差补偿;然后,对比逐历元对准方法和"三步"校准法两种不同综合产品的精度和稳定性,并对igmas近两年的钟差产品进行了评估和详细分析;最后,为验证综合产品的精度和一致性,采用5个测站的静态数据进行了PPP测试。计算结果表明:综合钟差的RMS最优且稳定,可作为评估分析中心产品精度的参考解。此外,综合产品北斗单系统静态PPP的结果优于多数分析中心,位置精度在4cm以内。

关键词： igmas Multi-GNSS 钟差综合系统误差抗差估计

应用igmas超快速星历的实时精密单点定位研究

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中国空间科学技术 2021年第1期41卷 29-37页

作者：徐伟证康国华彭攀周宏涛刘宗强赵腾南京航空航天大学航天学院南京210016 上海卫星工程研究所上海201109

中国主导建设的国际GNSS监测评估系统(igmas)相比国际上比较成熟的IGS系统在产品精度等方面存在差别,目前实时精密单点定位应用多采用IGS实时、近实时产品。为改变这一现状,针对igmas产品特性以及实时精密单点定位对超快速精密星历的需... 详细信息

中国主导建设的国际GNSS监测评估系统(igmas)相比国际上比较成熟的IGS系统在产品精度等方面存在差别,目前实时精密单点定位应用多采用IGS实时、近实时产品。为改变这一现状,针对igmas产品特性以及实时精密单点定位对超快速精密星历的需求,对igmas超快速星历的精度和稳定性方面进行评估,设计了igmas产品实时/事后下载应用程序,开展了基于igmas超快速星历的实时精密单点定位研究,并结合NovAtel OEM617双频接收机进行了GPS实时精密单点定位试验。实验结果表明,在连续观测23 min后定位误差即可收敛到分米级,较接收机原始定位精度高一个量级,且稳定性好,最终在E/N/U方向定位误差均方根分别为7.2 cm、6.4 cm、15.2 cm,与应用IGS超快速星历实时PPP试验取得相近的结果。研究实现了igmas数据获取、评估和实时PPP应用的一整套方案,验证了igmas超快速产品的性能,对推进igmas产品的应用提供了借鉴。

关键词： igmas 超快速星历实时下载精度和稳定性实时精密单点定位

MGEX和igmas的多系统轨道和钟差产品精度分析

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大地测量与地球动力学 2019年第1期39卷 13-19页

作者：计国锋杨志强贾小林长安大学地质工程与测绘学院西安市雁塔北路126号710054 地理信息工程国家重点实验室西安市雁塔中路1号710054 西安测绘研究所西安市雁塔中路1号710054

采用分析中心间互比、SLR残差检核、卫星钟差拟合以及阿伦方差等方法对MGEX和igmas提供的多系统轨道和钟差产品精度进行综合分析。结果表明,GPS和GLONASS卫星的轨道精度分别在1.0～1.3cm和2.0～3.6cm,其中igmas提供的轨道产品较优。Gali... 详细信息

采用分析中心间互比、SLR残差检核、卫星钟差拟合以及阿伦方差等方法对MGEX和igmas提供的多系统轨道和钟差产品精度进行综合分析。结果表明,GPS和GLONASS卫星的轨道精度分别在1.0～1.3cm和2.0～3.6cm,其中igmas提供的轨道产品较优。Galileo卫星的轨道一致性在10～17cm,采用ECODE2模型或附加先验模型可有效提高轨道精度。BDS GEO卫星的轨道一致性在数m级,径向精度约为25cm;IGSO和MEO卫星的轨道一致性分别在21～40cm和11～18cm左右,且径向精度分别优于10cm和5cm。MGEX和igmas提供的GPS和GLONASS卫星的钟差精度较好,但稳定性和可靠性仍有待提升。Galileo卫星的钟差一致性约为0.2～0.4ns,且钟差产品中吸收了未被模型化的轨道误差。BDS GEO、IGSO和MEO卫星的钟差一致性分别在0.35～0.46ns、0.25～0.33ns和0.11～0.21ns,其中CODE提供的BDS IGSO/MEO卫星的钟差产品受偏航姿态模式影响较大。

关键词：多GNSS MGEX igmas 轨道和钟差阿伦方差

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基于PPP的igmas综合产品应用测试

大地测量与地球动力学 2019年第11期39卷 1171-1177页

作者：焦国强宋淑丽中国科学院上海天文台上海市200030 中国科学院大学北京市100049

基于igmas产品综合与服务中心(ISC)发布的ISC产品及德国波茨坦地学研究中心(GFZ)发布的GBM产品和GBM钟差重采样后的GBM-300s产品对MGEX测站进行多系统的精密单点定位(PPP)测试,对2018-01-01~01-15全球15个MGEX测站的定位精度、收敛速度... 详细信息

基于igmas产品综合与服务中心(ISC)发布的ISC产品及德国波茨坦地学研究中心(GFZ)发布的GBM产品和GBM钟差重采样后的GBM-300s产品对MGEX测站进行多系统的精密单点定位(PPP)测试,对2018-01-01~01-15全球15个MGEX测站的定位精度、收敛速度、ZTD求解精度和测站钟差求解精度进行分析。结果表明,在北斗PPP方面,使用ISC产品的3D定位精度和收敛速度优于GBM产品0.89mm和24min,ZTD解算精度和测站钟差求解精度优于GBM产品0.3mm和0.02ns;在GPS、GLONASS、Galileo单系统PPP和四系统组合PPP方面,使用ISC产品的ZTD求解精度和测站钟差求解精度同GBM产品互差小于1.5mm和0.05ns,两者性能一致,没有明显差别,但使用ISC产品的PPP定位精度在高程方向低于GBM产品2~3mm,收敛速度慢于GBM产品5~20min。通过分析igmas产品的精度和服务的可靠性,为现阶段igmas产品性能的进一步提升给出建议。

关键词： igmas 精密单点定位多频多系统钟差间隔定位精度与收敛速度

Time Transfer Analysis of GPS-and BDS-Precise Point Positioning based on igmas Products

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Time Transfer Analysis of GPS-and BDS-Precise Point Position...

第九届中国卫星导航学术年会

作者： Yulong Ge Xuhai Yang Weijin Qin Hang Su Meifang Wu Yuanxi Wang Shengli Wang National Time Service Center Chinese Academy of Sciences Key Laboratory of Precise Positioning and Timing Technology Chinese Academy of Sciences University of Chinese Academy of Sciences School of Astronomy and Space Science University of Chinese Academy of Sciences Institute of Ocean Engineering Shandong University of Science and Technology

International time transfer experiment based on GPS-and BDS-precise point positioning(PPP) technique is carried out using final(ISC) and rapid(ISR) precise satellite clock products provided by iG MAS(international GNSS continuous Monitoring and Assessment System). As a comparison, the same processing is conducted by using COD products provided by the Center for Orbit Determination in Europe(CODE). Experimental data come from observation of seven stations from Multi-GNSS-Experiment(MGEX) and two stations including PT11(PTB) and BRUX(ROB) from time keeping laboratory in 70 days from 5 August to 15 October 2017. With PTB as the center node, the solutions of 8 time-links are formed. In order to verify the type A uncertainty(uA) of time transfer based on GPS-and BDS-PPP by using iG MAS products, this paper compares the differences between GPS-and BDS-PPP results and GPS PPP results using IGR products. The experimental results demonstrate that uA of time transfer based on GPS-and BDS-PPP using iG MAS1 products are roughly equal to CODE products. For the results of time-links based on GPS-and BDS-PPP, the STD of one-day arc solutions can reach better than 0.1 and 0.8 ns for all of processing, while 0.1 and 1 ns were achieved for ten-day arc solutions, respectively. Since uA of GPS-and BDS-PPP time transfer using iG MAS products was up to sub nanosecond, therefore, the experiments can provide a reference for BIPM to use BDS PPP based on iG MAS products for International UTC/TAI comparison. Moreover, this also illustrates iG MAS products is reliable.

关键词： Precise point positioning Time transfer igmas GPS BDS

Preliminary results of igmas BDS/GNSS absolute antenna phase center field calibration

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Preliminary results of iGMAS BDS/GNSS absolute antenna phase...

第十三届中国卫星导航年会

作者： Zhigang HU Hongliang Cai Wenhai Jiao Renyu Zhou Qingbin Zhai Xuanzuo Liu Haoyu Kan Qile Zhao GNSS Research Center Wuhan University Beijing Institute of Tracking and Telecommunication Technology National Calibration Center for Surveying Instrument and Chinese Academy of Sueveying&Mapping

The antenna phase center offset and ranging error caused by its variation can reach several cm or even dm level, which is a key error correction term that must be considered for GNSS high-precision applications. China’s independently self-built Beidou navigation satellite system（BDS） has opened global services, but there is no absolute antenna phase center correction model of Beidou-3 in the field of GNSS that is consistent with the definition of IGS. In this paper, based on a high-precision robot, the absolute phase center field calibration method is studied, and the geodetic-grade e antenna of the monitoring station of the international GNSS Monitoring ＆ Assessment Service（igmas） is calibrated for the first time based on the absolute antenna correction platform of Wuhan University. The preliminary results show that the antenna phase model has a frequency binning pattern, and the phase model characteristics with similar frequencies are relatively close. The internal conformity accuracy between the calibration results of multiple time periods is better than 1 mm, and the short baseline positioning verification consistency accuracy can reach 1.5-3 mm.

关键词： BDS-3 igmas Phase center correction Absolute antenna calibration

Positioning Performance Analysis of Combined BDS/GPS-RTK Based on igmas Products

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Positioning Performance Analysis of Combined BDS/GPS-RTK Bas...

第九届中国卫星导航学术年会

作者： Subo Wan Qianxin Wang Wen Wen She Mingbin Zhang School of Environment Science & Spatial Informatics China University of Mining and Technology

With the rapid development of the self-determination navigation system in many countries, multi-band multi-mode GNSS integrated positioning has become the current research hotspot, which can overcome the limitations that the navigation based on single satellite system would be not continuous and reliable while GNSS signal is sheltered seriously. According to the development status of GNSS navigation positioning system in China in recent years, the paper intended to study on the performance of combined BDS/GPS-RTK with the application of products of i GMAS. The result of static experiment showed that the positioning accuracy of single GPS was better than single BDS and combined BDS/GPS in open area, combined BDS/GPS was better than single BDS and single GPS in enclosed area. The result of dynamic vehicle experiment showed that combined BDS/GPS could still provide continuous and stable positioning service although the positioning reliability was greatly affected when the observation environment was bad. The result of antenna movement experiment showed that the positioning accuracy of single GPS and combined BDS/GPS was almost the same in either vertical or horizontal direction in open area and single GPS was better than combined BDS/GPS in enclosed area.

关键词： igmas combined BDS/GPS RTK positioning performance

Assessment of igmas final combination with nearly three-year solutions

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Assessment of iGMAS final combination with nearly three-year...

第九届中国卫星导航学术年会

作者： Hongliang Cai Xing Li Guo Chen Wenhai Jiao Beijing Institute of Tracking and Telecommunication Technology Shanghai Astronomical Observatory of Chinese Academy of Sciences School of Geodesy and Geomatics Wuhan University

The international GNSS continuous Monitoring and Assessment System(i GMAS) is developed as a service platform for multi‐GNSS and the Product Integration and Service Center(ISC) is the products reprocess center which provides global users with different time‐delay *** nearly three‐year products from i GMAS,the present paper focuses on the timeliness and precision of *** results show that there are four analysis centers with products timeliness more than 95% and keep stable,currently,the timeliness of combined solutions are better than 99%.Compared to the IGS products,the precision of final orbit and clock products differs between different satellite system,the GPS shows best among the four systems,the precision of orbit and clock are 1 cm and 0.05 ns,respectively,followed by GLONASS,2 cm and 0.1 ns for satellite orbit and clock,respectively,while the BDS IGSO/MEO and Galileo satellites show identical results,the orbit precision of both systems is about 4 cm,and about 0.2 ns for the satellite clock *** precision of combined final tropospheric delay products is 2 mm,with respect to the products from JPL,while the difference between the combinations of i GMAS and IGS is about 2 TECU.

关键词： igmas orbit clock bias combination precision

An Initial Analysis and Assessment on Final Products of igmas

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An Initial Analysis and Assessment on Final Products of iGMA...

第七届中国卫星导航学术年会

作者： Hongliang Cai Guo Chen Wenhai Jiao Kangkang Chen Tianhe Xu Beijing Institute of Tracking and Telecommunication Technology School of Geodesy and Geomatics Wuhan University School of Geology Engineering and Geomatics Chang’an University State Key Laboratory of Geo-information Engineering State Key Laboratory of Astronautic and Dynamics Xian Research Institute of Surveying and Mapping

The international GNSS Monitoring and Assessment System（iG MAS） is developed as a service platform for multi-GNSS and the Product Integration and Service Center（ISC） is the products reprocess center which provides global users with different time-delay products. The present paper focuses on the final products combination from different analysis centers and the emphasis is put on the consistency between different final products, then an initial assessment about the precision of final products is inhibited with one year data from igmas, including final satellite orbits, clock bias, Earth Rotation Parameters, global ionosphere map and troposphere products, and SLR measurements form ILRS are collected for validation of BDS and Galileo satellite orbits;meanwhile, the consistency between final orbits and ERP is analyzed.

关键词： igmas products combination final products consistency