Assessment of the Contribution of BeiDou GEO, IGSO, and MEO Satellites to PPP in Asia—Pacific Region

Zhao, Qile; Wang, Chen; Guo, Jing; Liu, Xianglin

doi:10.3390/s151229780

Cited by 22 publications

(16 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3.1, the precision of BDS products especially for GEOs is still limited. Zhao et al (2015) investigated the BDS PPP performance with BDS GEOs included and excluded, and found that in some cases BDS GEOs could slightly degrade the position accuracy. Hence, two schemes have been explored for BDSbased POD: with BDS GEOs (with GEOs) and without BDS GEOs (w/o GEOs).…”

Section: Bds-based Pod Resultsmentioning

confidence: 99%

“…Several simulation studies have already been performed to investigate the BDS-based LEO POD precision. Zhao et al (2015) analyzed the BDS data coverage and positioning accuracy with simulation scenarios based on the China's Tiangong-1 spacelab and International Space Station, and indicated that the positioning using onboard BDS data only was valid for 32 min per orbit revolution (90 min) for Tiangong-1, and the positioning accuracy was about 10 m with an average position dilution of precision (PDOP) of 1.9 . Liu et al (2014) simulated the onboard BDS data with 14 BDS-2 satellites and considered the BDS orbit errors and the observation noise in the observation simulation setup.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Precise orbit determination of the Fengyun-3C satellite using onboard GPS and BDS observations

Shi

et al. 2017

J Geod

View full text Add to dashboard Cite

The GNSS Occultation Sounder instrument onboard the Chinese meteorological satellite Fengyun-3C (FY-3C) tracks both GPS and BDS signals for orbit determination. One month's worth of the onboard dual-frequency GPS and BDS data during March 2015 from the FY-3C satellite is analyzed in this study. The onboard BDS and GPS measurement quality is evaluated in terms of data quantity as well as code multipath error. Severe multipath errors for BDS code ranges are observed especially for high elevations for BDS medium earth orbit satellites (MEOs). The code multipath errors are estimated as piecewise linear model in 2 • ×2 • grid and applied in precise orbit determination (POD) calculations. POD of FY-3C is firstly performed with GPS data, which shows orbit consistency of approximate 2.7 cm in 3D RMS (root mean square) by overlap comparisons; the estimated orbits are then used as reference orbits for evaluating the orbit precision of GPS and BDS combined POD as well as BDS-based POD. It is indicated that inclusion of BDS geosynchronous orbit satellites (GEOs) could degrade POD precision seriously. The precisions of orbit estimates by combined POD and BDS-based POD are 3.4 and 30.1 cm in B Wenwen Li 3D RMS when GEOs are involved, respectively. However, if BDS GEOs are excluded, the combined POD can reach similar precision with respect to GPS POD, showing orbit differences about 0.8 cm, while the orbit precision of BDSbased POD can be improved to 8.4 cm. These results indicate that the POD performance with onboard BDS data alone can reach precision better than 10 cm with only five BDS inclined geosynchronous satellite orbit satellites and three MEOs. As the GNOS receiver can only track six BDS satellites for orbit positioning at its maximum channel, it can be expected that the performance of POD with onboard BDS data can be further improved if more observations are generated without such restrictions.

show abstract

Section: Bds-based Pod Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Precise orbit determination of the Fengyun-3C satellite using onboard GPS and BDS observations

Shi

et al. 2017

J Geod

View full text Add to dashboard Cite

show abstract

“…Conventional PPP algorithm is a technique that uses precise orbit, clock and ionosphere-free observations for highly accurate positioning to achieve centimeter or decimeter level accuracy. The zenith tropospheric delay is estimated along with the position and ambiguity parameters in the conventional PPP algorithm [ 25 , 26 , 27 , 28 , 29 ]. In this step of evaluation, the conventional PPP algorithm is modified according to different tropospheric delay resolutions: using different empirical models ( i.e.…”

Section: Methodology and Datamentioning

confidence: 99%

Assessment of Three Tropospheric Delay Models (IGGtrop, EGNOS and UNB3m) Based on Precise Point Positioning in the Chinese Region

Zhang

Yuan

et al. 2016

Sensors

View full text Add to dashboard Cite

Tropospheric delays are one of the main sources of errors in the Global Navigation Satellite System (GNSS). They are usually corrected by using tropospheric delay models, which makes the accuracy of the models rather critical for accurate positioning. To provide references for suitable models to be chosen for GNSS users in China, we conduct herein a comprehensive study of the performances of the IGGtrop, EGNOS and UNB3m models in China. Firstly, we assess the models using 5 years’ Global Positioning System (GPS) derived Zenith Tropospheric Delay (ZTD) series from 25 stations of the Crustal Movement Observation Network of China (CMONOC). Then we study the effects of the models on satellite positioning by using various Precise Point Positioning (PPP) cases with different tropospheric delay resolutions, the observation data processed in PPP is from 21 base stations of CMONOC for a whole year of 2012. The results show that: (1) the Root Mean Square (RMS) of the IGGtrop model is about 4.4 cm, which improves the accuracy of ZTD estimations by about 24% for EGNOS and 19% for UNB3m; (2) The positioning error in the vertical component of the PPP solution obtained by using the IGGtrop model is about 15.0 cm, which is about 30% and 21% smaller than those of the EGNOS and UNB3m models, respectively. In summary, the IGGtrop model achieves the best performance among the three models in the Chinese region.

show abstract

“…After orbit maneuvering, satellite positions will vary by tens of kilometers, causing serious impacts on it services due to having to perform the positioning and orbit determination [ 7 , 8 , 9 ]. To adjust the strategies for positioning and orbit determination in a correct and timely manner, the abnormal conditions and maneuvers must be identified as soon as possible after they occur [ 10 , 11 , 12 , 13 , 14 , 15 , 16 ]. In practice, BeiDou satellite maneuver information is not available publicly, and only the hourly ephemeris broadcasts marks the satellite’s health status.…”

Section: Introductionmentioning

confidence: 99%

A Real-Time Robust Method to Detect BeiDou GEO/IGSO Orbital Maneuvers

Huang

Qin

Zhang

et al. 2017

Sensors

View full text Add to dashboard Cite

The frequent maneuvering of BeiDou Geostationary Orbit (GEO) and Inclined Geosynchronous Orbit (IGSO) satellites affects the availability of real-time orbit, and decreases the accuracy and performance of positioning, navigation and time (PNT) services. BeiDou satellite maneuver information cannot be obtained by common users. BeiDou broadcast ephemeris is the only indicator of the health status of satellites, which are broadcast on an hourly basis, easily leading to ineffective observations. Sometimes, identification errors of satellite abnormity also appear in the broadcast ephemeris. This study presents a real-time robust detection method for a satellite orbital maneuver with high frequency and high reliability. By using the broadcast ephemeris and pseudo-range observations, the time discrimination factor and the satellite identification factor were defined and used for the real-time detection of start time and the pseudo-random noise code (PRN) of satellites was used for orbital maneuvers. Data from a Multi-GNSS Experiment (MGEX) was collected and analyzed. The results show that the start time and the PRN of the satellite orbital maneuver could be detected accurately in real time. In addition, abnormal start times and satellite abnormities caused by non-maneuver factors also could be detected using the proposed method. The new method not only improves the utilization of observations for users with the data effective for about 92 min, but also promotes the reliability of real-time PNT services.

show abstract

Assessment of the Contribution of BeiDou GEO, IGSO, and MEO Satellites to PPP in Asia—Pacific Region

Cited by 22 publications

References 14 publications

Precise orbit determination of the Fengyun-3C satellite using onboard GPS and BDS observations

Precise orbit determination of the Fengyun-3C satellite using onboard GPS and BDS observations

Assessment of Three Tropospheric Delay Models (IGGtrop, EGNOS and UNB3m) Based on Precise Point Positioning in the Chinese Region

A Real-Time Robust Method to Detect BeiDou GEO/IGSO Orbital Maneuvers

Contact Info

Product

Resources

About