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precise orbit determination for LEO satellites:single-receiver ambiguity resolution using GREAT products

Geo-Spatial Information Science 2022年第1期25卷 63-73页

作者： Xingxing Li Yujie Qin Keke Zhang Jiaqi Wu Wei Zhang Qian Zhang Hongmin Zhang School of Geodesy and Geomatics Wuhan UniversityWuhanHubeiChina Department of Geodesy and Remote Sensing of the German Research Centre for Geosciences(GFZ) PotsdamGermany

In recent years,the large Low Earth orbit(LEO)constellations have become a hot topic due to their great potential to improve the Global Navigation Satellite Systems(GNSS)positioning *** of the important focus is how to obtain the accurate and reliable orbits for these constellations with dozens of LEO *** GNSS-based precise orbit determination(POD)will be exclusively performed to achieve this goal,where the Integer Ambiguity Resolution(IAR)plays a key role in acquiring high-quality *** this study,we present a comprehensive analysis of the benefit of the single-receiver IAR in LEO POD and discuss its implication for the future LEO *** perform ambiguity-fixed LEO POD for four typical missions,including Gravity Recovery and Climate Experiment(GRACE)Follow-On(GRACE-FO),Swarm,Jason-3 and Sentinel-3,using the Uncalibrated Phase Delay(UPD)products generated by our GREAT(GNSS+REsearch,Application and Teaching)*** results show that the ambiguity fixing processing can significantly improve the accuracy of LEO *** are negligible differences between our UPD-based ambiguity-fixed orbits and those based on the Observable Signal Bias(OSB)and Integer Recovery Clock(IRC)products,indicating the good-quality of UPD products we *** to the float solution,the fixed solution presents a better consistency with the external precise science orbits and the largest accuracy improvement of 5 mm is achieved for GRACE-FO ***,the benefit can be observed in laser ranging residuals as well,with a Standard Deviation(STD)reduction of 3–4 mm on average for the fixed *** from the absolute orbits,the relative accuracy of the space baseline is also improved by 20–30%in the fixed *** result demonstrates the superior performance of the ambiguity-fixed LEO POD,which appears as a particularly promising technique for POD of future LEO constellations.

关键词： precise orbit determination single-receiver ambiguity resolution onboard GPS observation LEO

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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 *** normal conditions,six BDS-3 satellites on average are ***,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 *** 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 ***,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 *** 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 ***,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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precise orbit determination for TH02-02 satellites based on BDS3 and GPS observations

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Chinese Journal of Aeronautics 2023年第5期36卷 475-485页

作者： Houzhe ZHANG Bing JU Defeng GU Ying LIU Kai SHAO Xiaojun DUAN Zhiyong HUANG College of Science National University of Defense TechnologyChangsha 410073China National Key Laboratory of Science and Technology on Aerospace Flight Dynamics Beijing Aerospace Control CenterBeijing 100094China MOE Key Laboratory of TianQin Mission TianQin Research Center for Gravitational PhysicsFrontiers Science Center for TianQinCNSA Research Center for Gravitational WavesSun Yat-sen University(Zhuhai Campus)Zhuhai 519082China School of Artificial Intelligence Sun Yat-sen University(Zhuhai Campus)Zhuhai 519082China School of Physics and Astronomy Sun Yat-sen University(Zhuhai Campus)Zhuhai 519082China Information Engineering University Zhengzhou 450001China

The Tianhui-202(TH02-02)satellite formation,as a supplement to the microwave mapping satellite system Tianhui-201(TH02-01),is the first Interferometric Synthetic Aperture Radar(InSAR)satellite formation-flying system that supports the tracking of BeiDou global navigation Satellite system(BDS3)new B1C and B2a ***,the twin TH02-02 satellites also support the tracking of Global Positioning System(GPS)L1&L2 and BDS B1I&B3I *** the spaceborne receiver employs two independent boards to track the Global Navigation Satellite System(GNSS)satellites,we design an orbit determination strategy by estimating independent receiver clock offsets epoch by epoch for each GNSS to realize the multi-GNSS data fusion from different *** performance of the spaceborne receiver is evaluated and the contribution of BDS3 to the kinematic and reduced-dynamic precise orbit determination(POD)of TH02-02 satellites is *** tracking data onboard shows that the average number of available BDS3 and GPS satellites are 8.7 and 9.1,*** carrier-to-noise ratio and carrier phase noise of BDS3 B1C and B2a signals are comparable to those of ***,strong azimuth-related systematic biases are recognized in the pseudorange multipath errors of B1C and *** pseudorange noise of BDS3 signals is better than that of GPS after eliminating the multipath errors from specific *** the GPS-based reduced-dynamic orbit with single-receiver ambiguity fixing technique as a reference,the results of BDS3-only and BDS3+GPS combined POD are *** Root Mean Square(RMS)of orbit comparison of BDS3-based kinematic and reduced-dynamic POD with reference orbit are better than 7 cm and 3 cm in three-Dimensional direction(3D).The POD performance based on B1C&B2a data is comparable to that based on B1I&*** precision of BDS3+GPS combined kinematic orbit can reach up to 3 cm(3D RMS),which has a more than 25%improvement relative to the GPS-only *** addi

关键词： BDS3 Multi-GNSS precise orbit determination Spaceborne GNSS receiver TH02-02

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Quality assessment of onboard GPS receiver and its combination with DORIS and SLR for Haiyang 2A precise orbit determination

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Science China Earth Sciences 2015年第1期58卷 138-150页

作者： GUO Jing ZHAO QiLe GUO Xiang LIU XiangLin LIU JingNan ZHOU Quan GNSS Research Center Wuhan University School of Geodesy and Geomatics Wuhan University Fugro Intersite B.V. Leidschendam 2263HWNetherlands Collaborative Innovation Center of Earth and Space Science Wuhan University Test and Assessment Research Center China Satellite Navigation Office

The GPS,DORIS,and SLR instruments are installed on Haiyang 2A(HY2A)altimetry satellite for precise orbit determination(POD).Among these instruments,the codeless GPS receiver is the state-of-art Chinese indigenous onboard receiver,and it is the first one successfully used for Low Earth orbit(LEO)***,the contribution assesses the performance of the receiver through an analysis of data integrity,numbers of all tracked and valid measurements as well as multipath *** receiver generally shows good performance and quality despite a few *** example,L2 observations are often missing in low elevations,particularly during the ascent of GPS satellites,and the multipath errors of P1 show a slightly abnormal ***,the PCO(Phase Center Offset)and PCV(Phase Center Variation)of the antenna of the GPS receiver are determined in this contribution.A significant leap for Z-component of PCO up to-1.2 cm has been found on 10 October ***,the obtained PCO and PCV maps are used for GPS only POD *** post-fit residuals of ionosphere-free phase combinations reduce almost 50%,and the radial orbit differences with respect to CNES(Centre National d’Etudes Spatiales)precise orbit Ephemeris(POEs)improve about 13.9%.The orbits are validated using the SLR data,and the RMS of SLR Observed minus Computed(O-C)residuals reduces from 17.5 to 15.9 *** improvements are with respect to the orbits determined without PCO and ***,six types of solutions are determined for HY2A satellite using different combinations of GPS,DORIS,and SLR *** of SLR O-C residuals and cross-comparison of orbits obtained in the contribution and the CNES POEs indicate that the radial accuracy of these orbits is at the 1.0 cm level for HY2A orbit solutions,which is much better than the scientific requirements of this *** is noticed that the GPS observations dominate the achievable accuracy of POD,and the combination of multiple types of observation

关键词： Haiyang 2A GPS receiver multipath precise orbit determination phase center offset phase center variations DORIS SLR

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GEO and IGSO joint precise orbit determination

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Science China(Physics,Mechanics & Astronomy) 2011年第6期54卷 1009-1013页

作者： MAO Yue DU Yu SONG XiaoYong JIA XiaoLin WU XianBing Xi'an Research Institute of Surveying and Mapping Xi'an 710054China China Aerospace Science and Technology Corporation Beijing 100048China

Experiments and analyses are carried out for GEO and joint GEO/IGSO precise orbit determination using data recorded by China's regional tracking *** show that joint GEO/IGSO orbit determination effectively solves the problem of poor observation geometry for GEO *** laser radial evaluation thus confirms that precision is as good as less than 0.1 *** the case of joint orbit determination,solving the empirical acceleration can reduce errors introduced by the imprecise solar radiation pressure model used for Chinese *** method also improves the accuracy of orbit prediction in the radial *** ephemeris accuracy is thus improved and the ephemeris can provide a better service to users with navigation and positioning requirements.

关键词： precise orbit determination empirical acceleration regional tracking network GEO IGSO

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precise orbit determination of BeiDou satellites based on BeiDou/GPS data

Precise orbit determination of BeiDou satellites based on Be...

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第三届中国卫星导航学术年会

作者： Min Li, Qile Zhao, Chuang Shi, Zhigang Hu Jingnan Liu GNSS Research Center, Wuhan University ,Wuhan 430079, China

The 10th BeiDou satellite successfully launched, marks the regional satellite navigation systemcom pleted its construction, and the BeiDou system have the ability to provide navigation services in Asia-Pacific region. This paper considering GPS precision ephemeris as space-time base, estimate the precision coordinates,receivers clock, and ZTD parameters firstly, and then compute the precision orbit of BeiDou satellites based on the BeiDou/GPS data of COMPASS Experimental Tracking Stations, and the overlap orbit and observation residuals were derived to assess the orbit quality. The preliminary results shows the 3D and radial precision can reach up to 20cm and 5cm for IGSO satellites, and dm-level and meter-level for GEO satellites respectively.

关键词： BeiDou navigation satellite system precise orbit determination PANDA BeiDou/GPS

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precise orbit determination for Haiyang 2A satellite using un‐differenced DORIS code and phase measurements

Precise orbit determination for Haiyang 2A satellite using u...

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第五届中国卫星导航学术年会

作者： Quan Zhou Jing Guo Qile Zhao Test and Assessment Research Center China Satellite Navigation office GNSS Research Center Wuhan University

Currently , the third generation DORIS instrument named DGXX has been developed and equipped on Jason‐2, Cryosat‐2, Saral and Chinese Haiyang 2A satellite. Compared with the previous ones, the DGXX has seven measurement channels, and is able to provide synchronous dual frequency phase and code measurements. The orbits could be determinated based on the dual frequency phase and pseudo‐range measurements directly, and the systematic errors could be analyzed. This contribution presents the algorithm for precise orbit determination with DORIS code and phase measurements. In addition, the orbit of HY2A are determinated from January to May 2012 using Position And Navigation Data Analyst software. The differences with respect to CNES POE orbits indicate that the accuracy in radial and 3D is 1.0 cm and 5.3 cm, respectively. Satellite laser ranging validation the accuracy of HY2A orbits is about 2.24 cm. Compared with the orbits computed with Doppler measurements, the accuracy of orbits computed with un‐differenced phase observables in along‐track and radial is a bit higher, the lower accuracy in cross‐track maybe caused by inaccuracy receiver DORIS clock.

关键词： HY2A DORIS pseudo‐range and phase precise orbit determination

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precise orbit determination of BeiDou Satellites Using Satellite Laser Ranging

Precise Orbit Determination of BeiDou Satellites Using Satel...

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第四届中国卫星导航学术年会

作者： Gang Zhao Shanshi Zhou Xuhua Zhou Bin Wu Shanghai Astronomical Observatory Chinese Academy of Sciences University of Chinese Academy of Sciences

As a highly accurate technique of satellite orbit tracking, a precise determination method of satellite orbit, and an independent way of external validation on the orbits obtained by other satellite precise orbit determination (POD) means, satellite laser ranging (SLR) has been applied in many international and Chinese satellite projects. In China’s BeiDou (Compass) Navigation Satellite System, as the cooperative targets of international SLR monitoring, multiple satellites have been equipped with on-board laser retro-reflector array, and high-quality observation data have been obtained from around 20 tracking stations distributed all over the world. In this work, we summarized the SLR tracking status on BeiDou satellites and determined the proper SLR dynamic POD strategy. Using SLR tracking data, we determined orbits of four BeiDou satellites, assessed SLR orbits’ accuracies by orbit overlap and orbit comparison with precise ephemeris produced from radio navigation bands, and analyzed characters and possible causes of orbit errors. The results demonstrated that SLR-derived orbits on BeiDou satellites are on the level of meter, and the precisions along radial direction can achieved decimeter level. For current BeiDou satellites in different types of orbits, and in the future construction and improvement of BeiDou Navigation Satellite System, SLR has already and will continue to play an important role in the process of POD and orbit validation.

关键词： satellite navigation satellite laser ranging precise orbit determination

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precise orbit determination of LEO satellite using onboard BDS-3 B1C/B2a observations

Precise orbit determination of LEO satellite using onboard B...

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第十三届中国卫星导航年会

作者： Youcun Wang Qile Zhao Kecai Jiang GNSS Research Center Wuhan University

The precise orbit determination（POD） of low earth orbit（LEO） satellites is always a hotspot topic in the field of satellite geodesy. Current gravity field determination, satellite altimetry, and remote sensing measurement depend crucially on the precise orbits of the spacecraft. BeiDou global navigation satellite system（BDS-3） is officially completed in 2020 and offers positioning, navigation, and timing（PNT） service for global users. The onboard BDS measurements from LEO satellites can be used for LEO POD and served as an effective supplement for BDS tracking geometry. In this study, the BDS-3 observations with B1 C and B2 a signals of HY-2 D spacecraft are employed for reduced-dynamic POD. For superior orbit quality, the extended analytical model for solar radiation pressure（SRP） is used for LEO POD, and in-flight calibration of the LEO receiver antenna is carried out to improve the orbit precision. Two weeks of onboard BDS-3 observation were used to assess the BDS-based POD performance. For HY-2 D satellite based on BDS-3 instruments, the capability of continuous tracking is at the global level, and almost all the epochs can have 5-7 usable BDS satellites. The average RMS of the phase residual from the reduced-dynamic POD is 6.5 mm, and that of pseudorange residual is 1.28 m. The internal precision for the entire arc is in good agreement. Moreover, an orbit self-consistency of 0.94 cm, 0.76 cm, and 0.49 cm is displayed in the along-track, cross-track, and radial directions, respectively. The average consistency for the reduced-dynamic orbit is at the 1.33 cm position RMS level. BDS-3-based LEO orbit determination with the uncertainty of about 2 cm is obtained through independent Satellite Laser Ranging（SLR） validation. These results could be used for the Chinese subsequent LEO satellite equipped with a BDS-3 receiver.

关键词： BDS-3 LEO satellite precise orbit determination B1C/B2a orbit precision

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On simulation of precise orbit determination of HY-2 with centimeter precision based on satellite-borne GPS technique

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Applied Geophysics 2012年第1期9卷 95-107,117页

作者：郭金运秦建孔巧丽李国伟山东科技大学测绘学院青岛266590 海岛(礁)测绘技术国家测绘地理信息局重点实验室青岛266590

The HY-2 satellite carrying a satellite-borne GPS receiver is the first Chinese radar altimeter satellite, whose radial orbit determination precision must reach the centimeter level. Now HY-2 is in the test phase so that the observations are not openly released. In order to study the precise orbit determination precision and procedure for HY-2 based on the satellite- borne GPS technique, the satellite-borne GPS data are simulated in this paper. The HY-2 satellite-borne GPS antenna can receive at least seven GPS satellites each epoch, which can validate the GPS receiver and antenna design. What＇s more, the precise orbit determination processing flow is given and precise orbit determination experiments are conducted using the HY-2-borne GPS data with both the reduced-dynamic method and the kinematic geometry method. With the 1 and 3 mm phase data random errors, the radial orbit determination precision can achieve the centimeter level using these two methods and the kinematic orbit accuracy is slightly lower than that of the reduced-dynamic orbit. The earth gravity field model is an important factor which seriously affects the precise orbit determination of altimeter satellites. The reduced-dynamic orbit determination experiments are made with different earth gravity field models, such as EIGEN2, EGM96, TEG4, and GEMT3. Using a large number of high precision satellite-bome GPS data, the HY-2 precise orbit determination can reach the centimeter level with commonly used earth gravity field models up to above 50 degrees and orders.

关键词： HY-2 satellite satellite-borne GPS technique precise orbit determination reduced-dynamic method kinematic geometry method

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