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Inter-satellite link augmented BeiDou-3 orbit determination for precise point positioning

Chinese Journal of Aeronautics 2022年第4期35卷 332-343页

作者： Liqian ZHAO Xiaogong HU Chengpan TANG Shanshi ZHOU Yueling CAO Qianxin WANG ranran su Space Star Technology Co. Ltd.Beijing 100095China Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China School of Environment Science and Spatial Informatics China University of Mining and TechnologyXuzhou 221116China Beijing Satellite Navigation Center Beijing 100094China

Precise Point Positioning(PPP) requires precise products, including high-accuracy satellite orbit and clock parameters. It is impossible to obtain an orbit solution that is sufficiently accurate for PPP services with a regional tracking network;therefore, satellite orbits are usually estimated by a global tracking network with a large number of ground stations. However, it is expensive to build globally distributed stations. Fortunately, BeiDou-3 satellites carry an InterSatellite Link(ISL) payload, which can track the whole arc of the BeiDou-3 satellites and enhance the orbit determination accuracy with regional ground stations. In this contribution, a novel orbit determination strategy for BeiDou-3 PPP is proposed, in which the BeiDou-3 satellite orbits are enhanced by the ISL. First, the generation of precise satellite products is demonstrated in *** addition, the products are assessed by Satellite Laser Ranging(SLR) residuals and overlap comparisons. Moreover, the products are used for receivers in China's Mainland to carry out the static and kinematic modes to research the PPP performance of Bei Dou-3’s 3IGSO/24MEO *** SLR validations of the satellite orbits demonstrate an accuracy better than 0.1 m in the radial component, and the orbit overlap comparisons show accuracies of 0.016 m in the radial component,0.088 m in the along-track component and 0.087 m in the cross-track component. The Standard Deviation(STD) in the differences in overlapping arcs for the estimated satellite clocks is approximately 0.10 ns. The static PPP results demonstrate that the error in both the horizontal and vertical components is smaller than 10 cm after 30 minutes of convergence. After 24 hours of convergence,the errors are 0.70 cm, 0.63 cm and 1.99 cm for the north, east and up components, *** kinematic PPP experiment illustrates that the Root Mean Square(RMS) position errors in the north, east and up components are approximately 3.23 cm, 5.27 cm a

关键词： BeiDou-3 Clock offsets Convergence Inter-satellite link Precise Point Positioning Regional ground stations Satellite orbits

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Compass RDSS Positioning Accuracy Analysis

Compass RDSS Positioning Accuracy Analysis

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第五届中国卫星导航学术年会

作者： Guo Rui su ranran Liu Li Hu Guangming Chang Zhiqiao Beijing Satellite Navigation Center

ISBN: (纸本)9783642547393

The RDSS service is an important component in the Compass system, which is accomplished by the GEO satellites with the restriction of known elevation. The RDSS observation model was deduced, and the positioning model was given with the elevation restriction. RDSS positioning tests were implemented with real observation data, the results were as follows: 1) the PDOP value was improved greatly to 1.5, with elevation restriction;2) the RDSS observation noise is about 0.6ns, which was greater than the pseudoranging and phase ranging in the RNSS;3) the horizontal accuracy could reach 4.6 m in the Beijing region. 4) the main factors influenced the positioning accuracy include the elevation error, the time delay of both satellites and ground equipment, therefore in order to realize 10 m horizontal position accuracy, the elevation error should be less than 10 m, and the equipment time delay should be less than 10 ns.

关键词： GEO RDSS, positioning elevation equipment time delay

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Forecast of equivalent clock correction and its application

Forecast of equivalent clock correction and its application

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第五届中国卫星导航学术年会

作者： XING Nan HU Xiaogong CAO Yueling su ranran WU Xiaoli Beijing Research Institute of Telemetry Shanghai Astronomical Observatory Chinese Academy of Sciences Beijing Global Information Center of Application and Exploitation

ISBN: (纸本)9783642547393

Beidou Navigation Satellite System provides two kinds of services: basic navigation service and wide area differential service. To enhance the positioning accuracy, both services are challenged by orbit error reduction problem, especially during yaw‐steering mode. Besides basic information, additional parameters, such as satellite pseudorange differential correction, could efficiently correct satellite orbit error and clock error. However, since it needs to be calculated in real‐time, differential correction is only broadcast to authorized users. Through investigation of the historical record, we find that shortly （an hour） forecasting for differential correction is doable. We proposed two forecasting methods in this work, and tested them with real observation data. We find that positioning precision of basic navigation service could be efficiently improved with the forecasted differential correction, in some cases could even reach the level of wide area differential service.

关键词： Beidou Navigation Satellite System satellite pseudorange differential correction positioning accuracy

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Kinematic Wide Area Differential Corrections for BeiDou Regional System basing on two-way Time Synchronization

Kinematic Wide Area Differential Corrections for BeiDou Regi...

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第五届中国卫星导航学术年会

作者： Cao Yueling Hu Xiaogong Zhou Jianhua Wu Bin Liu Li Zhou Shanshi su ranran Chang Zhiqiao Wu Xiaoli Shanghai Astronomical Observatory Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences Beijing Global Information Application and Development Center

ISBN: (纸本)9783642547393

Real-time wide area differential corrections are provided to BeiDou authorized users to satisfy the need of high-accuracy navigation service. The algorithm of wide area differential corrections are studied based on independent two-way time synchronization system and the performance of two kinds of differential modes with one-dimensional （also the equivalent satellite clock correction introduced in BeiDou ICD file） or four-dimensional correction are comparatively analyzed. The results show that for the current one-dimensional mode, the correction accuracy will decrease when the orbital errors are large, especially for the situations such as quickly orbit determination recovery after satellite failure or maneuver. While for the four-dimensional mode, the stability and precision of the separation of ephemeris and satellite clock parameters are seriously limited by the regional monitoring network. Applying the two-way time synchronization observations, the high-precision separation of orbital and satellite clock errors is realized with kinematic method, and with actual observations, the processing results show that user differential range error may be minimized to decimeter level and the positioning accuracy is also improved by 40% in the area lacked monitor stations. The four-dimensional mode may process in real-time and once be applied in BeiDou Wide Area Differential Augmentation System, the accuracy, continuity and availability of the system will all be improved.

关键词： Time synchronization system Separation of orbital and clock error DOP

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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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The wide-area difference system for the regional satellite navigation system of COMPASS

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Science China(Physics,Mechanics & Astronomy) 2012年第7期55卷 1307-1315页

作者： CAO YueLing HU XiaoGong WU Bin ZHOU ShanShi LIU Li su ranran CHANG ZhiQiao HE Feng ZHOU JianHua Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030 China Graduate University of Chinese Academy of Seiences Beijing 100049 China Beijing Global Information Application and Development Center Beijing 100094 China

The regional satellite navigation system of COMPASS (Phase I) provides both open services and authorized services. Authorized services offer differential corrections and integrity information to users to support higher positioning, navigation and timing precision. Experimenting with real data, positioning accuracy is estimated with a 3GEO/4IGSO COMPASS constellation. The results show that with dual-frequency and single-frequency pseudo-range measurements, the positioning errors are respectively 8 and 10 m (RMS) for open service users, while for authorized users, the errors are 4 and 5 m (RMS), respectively. The COMPASS constellation geometry may cause large error to occur in the height component by 7-9 m for dualor single-frequency users, which can be effectively reduced with the differential corrections supplied by the authorized services. Multipath errors are identified and corrected for COMPASS, resulting in 25% positioning accuracy improvement for dual-frequency users and 10% improvement for single-frequency users.

关键词： COMPASS equivalent satellite clock error ionospheric grid multipath error positioning error

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Design of refractory multi-principal-element alloys for high-temperature applications

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npj Computational Materials 2023年第1期9卷 884-893页

作者： Gaoyuan Ouyang Prashant Singh ranran su Duane D.Johnson Matthew J.Kramer John H.Perepezko Oleg N.Senkov Daniel Miracle Jun Cui Division of Materials Science and Engineering Ames LaboratoryAmesIA 50011USA Department of Materials Science and Engineering University of Wisconsin-MadisonMadisonWI 53706USA Department of Materials Science and Engineering Iowa State UniversityAmesIA 50011USA Air Force Research Laboratory Materials and Manufacturing DirectorateWright-Patterson Air Force BaseDaytonOH 45433USA

Refractory multi-principal-element alloys(RMPEAs)exhibit high specific strength at elevated temperatures(T).However,current RMPEAs lack a balance of room-temperature(RT)ductility,high-T strength,and high-T creep *** density-functional theory methods,we scanned composition space using four criteria:(1)formation energies for operational stability:-150250 GPa;(3)inverse Pugh ratio for ductility:G/B2500°*** rapid bulk alloy synthesis and characterization,we validated theory and down-selected promising alloy compositions and discovered Mo72.3W12.8Ta10.0Ti2.5Zr2.5 having well-balanced RT and high-T mechanical *** alloy has comparable high-T compressive strength to well-known MoNbTaW but is more ductile and more creep *** is also superior to a commercial Mo-based refractory alloy and a nickel-based superalloy(Haynes-282)with improved high-T tensile strength and creep resistance.

关键词： creep alloy alloys

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The Method for Inter-satellite Time Compare and Satellite-clock Prediction

The Method for Inter-satellite Time Compare and Satellite-cl...

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第五届中国卫星导航学术年会

作者： Guifen TANG Weifen YANG Bin WU Li LIU ranran su Beijing Satellite Navigation Center Haidian information center Shanghai Astronomical Observatory the Chinese Academy of Sciences

Inter-satellite observations realize continuous observation for mobile satellite,which has great significance for enhancing satellite clock prediction *** paper derives comparison model for inter-satellite time *** also gives method to calculate satellite-ground clock error form inter-satellite clock *** theory,Mobile satellite clock prediction accuracy can be greatly enhanced after adding inter-satellite clock ***,the observed heterogeneity of devices led to clock error sequence is not enough *** paper research a detection and compensation technology for slight jump clock *** propose a combined method with traditional gross error detection and subtraction adjacent epochs,which can eliminate the heterogeneous clock errors caused inconsistency observation equipment and enhance the satellite clock prediction ***,we make experiment with real and simulation data to verify the validity and effectiveness for the proposed theories and methods

关键词： Time Compare with Inter-Satellite links Satellite-clock error Satellite-clock Predict

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A Method Based on the Orbital Error Correction of the Wide Area Differential Positioning Algorithm

A Method Based on the Orbital Error Correction of the Wide A...

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第四届中国卫星导航学术年会

作者： ranran su Nan Xing Lei Zhang Li Liu Guifen Tang Guangming Hu Min Ma Beijing Satellite Navigation Center Shanghai Astronomical Observatory Chinese Academy of Sciences

Satellite navigation service using GEO satellite provides positioning service to local users. Continuous services ask for kinetic method to determine orbit during the GEO satellite orbital maneuver phase. However, kinetic method brings larger orbital error so that the positioning accuracy will drop. This paper presents a method based on the orbital error correction of the wide area differential positioning algorithm. Based on analysis of the GEO satellite orbit maneuver characteristics and other factors that affect positioning accuracy, an improved algorithm is designed, which can enhance the positioning accuracy during orbit maneuver.

关键词： satellite navigation service orbital maneuver orbit error correction wide-area differential positioning

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基于星地/星间联合观测的时间比对方法

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武汉大学学报（信息科学版） 2018年第2期43卷 183-187页

作者：唐桂芬杨伟锋苏冉冉夏爱民北京卫星导航中心北京100094 北京市海淀信息中心北京100063

星间观测实现了移动卫星的连续跟踪,是提升卫星钟时间比对精度的重要手段。研究了基于星地/星间联合观测时间比对技术;推导了星地/星间时间同步比对模型;给出了星间钟差到星地钟差的一致性归算方法。理论上加入星间观测移动卫星钟差预... 详细信息

星间观测实现了移动卫星的连续跟踪,是提升卫星钟时间比对精度的重要手段。研究了基于星地/星间联合观测时间比对技术;推导了星地/星间时间同步比对模型;给出了星间钟差到星地钟差的一致性归算方法。理论上加入星间观测移动卫星钟差预报精度能大幅提升,但异质观测设备导致钟差观测序列不连续,影响了卫星钟预报精度。研究了小幅钟差跳变的探测与补偿技术,提出了基于传统粗差探测与相邻历元组差相结合的钟差跳变探测方法,有效消除了异质观测设备带来的钟差不一致性,提升了卫星钟预报精度。最后利用实测与仿真数据验证了所提出的理论和方法的正确性和有效性。

关键词：星地测距星间测距时间同步星地钟差钟差预报

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