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Applications of two-way satellite time and frequency transfer in the BeiDou navigation satellite system

Science China(Physics,Mechanics & Astronomy) 2016年第10期59卷 72-80页

作者： ShanShi Zhou Xiaogong Hu Li Liu Rui Guo LingFeng Zhu ZhiQiao Chang ChengPan Tang xiuqiang gong Ran Li Yang Yu Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China Beijing Satellite Navigation Center Beijing 100094China

A two-way satellite time and frequency transfer(TWSTFT) device equipped in the BeiDou navigation satellite system(BDS)can calculate clock error between satellite and ground master clock. TWSTFT is a real-time method with high accuracy because most system errors such as orbital error, station position error, and tropospheric and ionospheric delay error can be eliminated by calculating the two-way pseudorange difference. Another method, the multi-satellite precision orbit determination(MPOD)method, can be applied to estimate satellite clock errors. By comparison with MPOD clock estimations, this paper discusses the applications of the BDS TWSTFT clock observations in satellite clock measurement, satellite clock prediction, navigation system time monitor, and satellite clock performance assessment in orbit. The results show that with TWSTFT clock observations, the accuracy of satellite clock prediction is higher than MPOD. Five continuous weeks of comparisons with three international GNSS Service(IGS) analysis centers(ACs) show that the reference time difference between BeiDou time(BDT) and golbal positoning system(GPS) time(GPST) realized IGS ACs is in the tens of nanoseconds. Applying the TWSTFT clock error observations may obtain more accurate satellite clock performance evaluation in the 104 s interval because the accuracy of the MPOD clock estimation is not sufficiently high. By comparing the BDS and GPS satellite clock performance, we found that the BDS clock stability at the 103 s interval is approximately 10.12, which is similar to the GPS IIR.

关键词： BDS TWSTFT satellite clock prediction accuracy system reference time Allan variance

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Modeling and application of COMPASS satellite orbits and clocks predicted correction

Modeling and application of COMPASS satellite orbits and clo...

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第五届中国卫星导航学术年会

作者： ZHANG Yize CHEN Junping gong xiuqiang WU Bin WANG Jiexian YANG Sainan LI Mao CollegeofSurveyingandGeo-Informatics TongjiUniversityShanghaiChina ShanghaiAstronomicalObservatory ChineseAcademyofScienceShanghaiChina

ISBN: (纸本)9783642547423

To evaluate the satellite orbit and clock errors for COMPASS, we compare the difference between broadcast ephemeris and precise orbits and clocks, results show that the orbit errors present certain periodicity for GEO and IGSO satellites. The SISRE of COMPASS is larger than GPS and GLONASS overall. However, the broadcast ephemeris of COMPASS appears regular changes in short time. Based on this, we establish different rapid correction models for COMPASS satellite orbits and clocks error. Analysis proves that the result performs well when the length of the arc for the model is shorter than 30 minutes, and the linear model is best for satellite clock corrections. By using this model, we predict the corrections of the satellite orbits and clocks, which is used for pseudo‐range and carrier phase positioning. Results show that the positioning accuracy is on the same level with precise products for pseudo‐range and carrier phase, while the convergence time is longer. This research provides an important basis for the realization of sub‐meter wide area augmentation of COMPASS.

关键词： broadcast ephemeris error Space-In-Space Range Error (SISRE) predicted model single point positioning

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Mathematical model for computing precise local tie vectors for CMONOC co-located GNSS/VLBI/SLR stations

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Geodesy and Geodynamics 2015年第1期6卷 1-6页

作者： Shen Yunzhong You Xinzhao Wang Jiexian Wu Bin Chen Junping Ma Xiaping gong xiuqiang College of Surveying and Geo-informatics Tongji University National Earthquake Infrastructure Service China Earthquake Administration Shanghai Astronomical Observatory Chinese Academic of Science

The seven co-located sites of the Crustal Movement Observation Network of China（CMONOC） in Shanghai, Wuhan, Kunming, Beijing, Xi＇an, Changchun, and Urumqi are equipped with Global Navigation Satellite System（GNSS）, very long baseline interferometry（VLBI）, and satellite laser ranging（SLR） equipment. Co-location surveying of these sites was performed in 2012 and the accuracies of the solved tie vectors are approximately 5 *** paper proposes a mathematical model that handles the least squares adjustment of the 3D control network and calculates the tie vectors in one step, using all the available constraints in the adjustment. Using the new mathematical model, local tie vectors can be more precisely determined and their covariance more reasonably estimated.

关键词： Co-located site Tie vector(TV) Reference point Global Navigation satellite system(GNSS) Very long baseline interferometry(VLBI)

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Analysis of RDSS positioning accuracy based on RNSS wide area differential technique

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Science China(Physics,Mechanics & Astronomy) 2013年第10期56卷 1995-2001页

作者： XING Nan SU RanRan ZHOU JianHua HU Xiaogong gong xiuqiang LIU Li HE Feng GUO Rui REN Hui HU GuangMing ZHANG Lei Shanghai Astronomical Observatory Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences Beijing Satellite Navigation Center

The BeiDou Navigation Satellite System(BDS) provides Radio Navigation Service System(RNSS) as well as Radio Determination Service System(RDSS).RDSS users can obtain positioning by responding the Master Control Center(MCC) inquiries to signal transmitted via GEO satellite *** positioning result can be calculated with elevation constraint by *** primary error sources affecting the RDSS positioning accuracy are the RDSS signal transceiver delay,atmospheric trans-mission delay and GEO satellite position *** GEO orbit maneuver,poor orbit forecast accuracy significantly impacts RDSS services.A real-time 3-D orbital correction method based on wide-area differential technique is raised to correct the orbital *** from the observation shows that the method can successfully improve positioning precision during orbital maneuver,independent from the RDSS reference *** improvement can reach 50% in *** calibration of the RDSS signal transceiver delay precision and digital elevation map may have a critical role in high precise RDSS positioning services.

关键词： BeiDou Navigation Satellite System (BDS) RDSS RNSS wide-area differential technique

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Analysis of BDS Satellite Clock Prediction Contribution to Rapid Orbit Recovery

Analysis of BDS Satellite Clock Prediction Contribution to R...

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第九届中国卫星导航学术年会

作者： Qian Chen Junping Chen Yize Zhang Shan WU xiuqiang gong Shanghai Astronomical Observatory Chinese Academy of Sciences School of Astronomy and Space Science University of Chinses Academy of Sciences

The BDS-2 system is designed as a GEO/IGSO/MEO mixed ***,there exists satellite maintaining operation for GEO or IGSO satellite every 7 to 10 *** this period the maneuver satellite is out of *** will be about 5 to 6 hours starting from the beginning of satellite maneuver to the release of the first group of recovery *** of satellite clock assisted precise orbit determination(POD) is normally implement,where the most critical factor that contributes to the availability of maneuver satellites is the length of accumulation of ***,the last hour of real-time observed pseudo-range data of tracking station could not be included in POD,due to the reason that the satellite clock could not be observed in real-time..In this paper,we propose to use the polynomial fitting method to forecast the satellite clocks and use it in *** analyze the accuracy of satellite clocks prediction and its contribution to the rapid orbit *** show that the satellite unavailability time could be shortened by at least 1 hour,which effectively improves satellite *** it improves the accuracy of orbit determination and prediction by more than 15% and 70%.

关键词： BDS Time Synchronization Satellite Clock Precise Orbit Determination Rapid Orbit Recovery Satellite Availability

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The Establishment And Precision Analysis Of Global Ionospheric Model Of COMPASS System

The Establishment And Precision Analysis Of Global Ionospher...

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第四届中国卫星导航学术年会

作者： xiuqiang gong Nan Xing Shanshi Zhou Yueling Cao Xiaogong Hu Bin Wu Shanghai Astronomical Observatory Chinese Academy of Sciences

Ionospheric delay is one of the main error sources affecting the positioning and timing precision of satellite navigation system for single frequency users. China’s regional satellite navigation system uses ionospheric puncture point data of monitoring stations to fit the 8 parameters of klobuchar model in geographic coordinate system,and broadcasts them to users through the navigation message which is valid for two hours. Long-term monitoring shows that this model can correct the ionospheric delay up to 74% in service area around China. Due to the lack of ionospheric measured data in the southern hemisphere and high latitudes of the northern hemisphere , this model can not guarantee the correction accuracy in equatorial belt and high latitudes. This paper improves the klobuchar model expressed in the form of 9 parameters. Not only this model can keep the ionospheric double-peak characteristic but also ensure global fitting precision. In order to obtain real-time ionospheric data outside regional monitoring network, this paper examines the precision of forecasting model based on ionosphere spherical harmonic coefficient. According to the results of comparison,the model in this paper can correct the ionospheric delay for the next 24 hours up to 72% in China. Globally, the correction accuracy reaches 70% in the north hemisphere, while 69% in the south hemisphere. As a result, the correction precision of the model is better than the model broadcasted by GPS.

关键词： COMPASS. Ionosphere. Klobuchar. Amplitude. Spherical harmonics. Magnetic symmetry

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圆锥形曲面的拟合

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工程勘察 2010年第10期38卷 79-82页

作者：巩秀强王解先同济大学测量系上海200092 现代工程测量国家测绘局重点实验室上海200092

为测定空间任意放置的圆锥设备的变形和空间位置的变化,可以根据全站仪采集到的设备表面离散点的坐标,求得圆锥体的空间位置、方向和大小。本文介绍了根据观测点到圆锥面的距离偏差,列误差方程。根据最小二乘原理的要求,认为"最佳"地拟... 详细信息

为测定空间任意放置的圆锥设备的变形和空间位置的变化,可以根据全站仪采集到的设备表面离散点的坐标,求得圆锥体的空间位置、方向和大小。本文介绍了根据观测点到圆锥面的距离偏差,列误差方程。根据最小二乘原理的要求,认为"最佳"地拟合于各观测点的估计圆锥面,应使各观测点到该圆锥面偏差的平方和最小。从而可以拟合出圆锥的顶点坐标、轴线方程和顶角。

关键词：圆锥轴线方程顶点顶角

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北斗广播电文钟差模型精度评估及改善策略

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测绘学报 2021年第2期50卷 181-188页

作者：巩秀强袁俊军胡小工王彬陈俊平周善石中国科学院上海天文台上海200030 中国科学院大学北京100049 上海市空间导航与定位技术重点实验室上海200030

星载原子钟是北斗卫星导航系统(BDS)的核心设备,其钟差模型是北斗广播电文的重要组成部分,模型精度直接影响BDS的服务性能。本文采用星地双向时频传递(TWSTF)钟差测量为参考,评估了BDS广播电文钟差模型精度,结果表明BDS广播电文钟差模... 详细信息

星载原子钟是北斗卫星导航系统(BDS)的核心设备,其钟差模型是北斗广播电文的重要组成部分,模型精度直接影响BDS的服务性能。本文采用星地双向时频传递(TWSTF)钟差测量为参考,评估了BDS广播电文钟差模型精度,结果表明BDS广播电文钟差模型精度优于2 ns(数据龄期小于12 h)。针对BDS广播电文钟差参数解算问题,结合BDS地面段的钟差模型解算策略,本文提出进一步提升精度的多种策略。对于1 h时长的短期预报,本文提出加权线性模型与混合区间线性模型的钟差拟合预报方法,短期预报精度可提高20%以上;对于预报时长大于6 h的中长期预报,本文采用谱分析钟差时间序列,并根据谱分析结果构造预报模型,与简单的二次多项式模型预报相比,预报6 h精度提高13%,预报12 h平均提高了21%;对于IGSO/MEO卫星,本文提出将TWSTF的设备时延值作为参数估算,使钟差模型在设备切换后精度提高18%。最后,利用本文提出的改进策略对2017年1月—6月的钟差数据重新处理,获得了新的广播电文钟差模型时间序列。利用新的广播电文钟差模型进行北斗监测接收机定位,结果表明,N、E、U 3个方向精度分别提高14.22%、29.39%、14.91%,显著提升了BDS广播电文钟差服务性能。

关键词： BDS 广播电文钟差 TWSTF 精度评估谱分析精度提升

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Accuracy analyses of precise orbit determination and timing for COMPASS/Beidou-2 4GEO/5IGSO/4MEO constellation

Accuracy analyses of precise orbit determination and timing ...

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第四届中国卫星导航学术年会

作者： Shanshi ZHOU Xiaogong HU Jianhua ZHOU Junping CHEN xiuqiang gong Chengpan TANG Bin WU Li LIU Rui GUO Feng HE Xiaojie LI Hongli TAN Shanghai Astronomical Observatory Chinese Academy of Sciences

Up to the end of October 2012, 14 COMPASS/Beidou-2 regional satellite navigation satellites are fully operational. Different with Global Positioning System （GPS）, the space segment of COMPASS consists of Geostationary Earth Orbit （GEO） satellites, Inclined Geosynchronous Satellite Orbit （IGSO） satellites and Medium Earth Orbit （MEO） satellites, and navigation information is provided by monitoring stations limited in regional area. Besides, attitude control mode is different for each type of satellites. The predictability of satellite attitude will make broadcast ephemeris precisely predicted. In this study, satellite telemetry data are compared with nominal attitude to assess the accuracy of satellite attitude prediction. Experiments show that the accuracy is different for each type satellites, and overall prediction accuracy is better than 1°. The analyses of pseudo-range multipath noise for receivers from different manufacturers show that the random noise characteristics is significantly for the US and European manufacturers’ receivers, and the magnitude is larger than domestic manufacturers’, but strong daily repeatability of multipath noise characteristics is displayed for domestic receivers. The accuracy of precision orbit determination （OD） for COMPASS using regional and global monitoring stations data are compared to evaluate the impact of monitoring stations’ distribution on the accuracy of satellite OD. Satellite Leaser Range （SLR） residuals are adopted to assess the satellite orbit accuracy in station line-of-sight direction. The results show that the accuracy of satellite orbit overlap is about 0.2m, 1.2m and 0.6m in R/T/N direction for regional monitor network, the accuracy for MEO overlap is slightly worse than two other type satellites, and the SLR residual is better than 1m. The two-way satellite time frequency transfer （TWSTFT） observations are adopted to evaluate the accuracy of satellite clock error estimations. Experiments show that the standard d

关键词： COMPASS/Beidou-2 Satellite attitude Multi-path noise POD Timing

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北斗广播星历偏差分析及改正

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测绘学报 2016年第S2期45卷 64-71页

作者：张益泽陈俊平周建华杨赛男王彬陈倩巩秀强同济大学测绘与地理信息学院上海200092 中国科学院上海天文台上海200092 中国科学院大学北京100049 北京卫星导航中心北京100094

以后处理精密轨道钟差为参考,分析了2014年2月至2016年10月北斗广播星历误差及空间信号精度,分析结果表明,北斗广播星历存在偏差,最大超过2m。在此基础上,基于广域差分改正数,采用18个MGEX站不同频点及频点组合连续97d的数据对以上广播... 详细信息

以后处理精密轨道钟差为参考,分析了2014年2月至2016年10月北斗广播星历误差及空间信号精度,分析结果表明,北斗广播星历存在偏差,最大超过2m。在此基础上,基于广域差分改正数,采用18个MGEX站不同频点及频点组合连续97d的数据对以上广播星历偏差进行了进一步验证。验证结果表明,不同卫星的伪距观测残差存在与广播星历偏差一致的系统性偏差。比较后处理给出的TGD和广播星历给出的TGD参数的偏差(dTGD),发现dTGD与基于广域差分参数的BEB的相关系数达到0.89,这表明经广域差分参数改正后的星历偏差可能是由广播电文中的TGD偏差造成。将北斗广播星历偏差改正到TGD参数上,分析对用户定位的影响。结果表明,经改正后,双频用户在N、E、U 3个方向单点定位精度分别提高14.9%、28.4%、15.5%,其定位残差也明显得到改善。

关键词： MGEX 伪距残差广播星历偏差群延迟单点定位

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