Accuracy Analysis of GNSS Hourly Ultra-Rapid Orbit and Clock Products from SHAO AC of iGMAS

Chen, Qinming; Song, Shuli; Zhou, Weili

doi:10.3390/rs13051022

Cited by 19 publications

(10 citation statements)

References 27 publications

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“…Since TRR and SRP show similar characteristics that originated from the Sun, the former is often incorporated with SRP in a combined form as done in Equation (6). Ref.…”

Section: Thermal Radiation Pressurementioning

confidence: 99%

“…For the precise orbit determination (POD) of BDS-2 satellites, much research was carried out to improve the GEO orbits with enhanced solar radiation pressure (SRP) models [2,3], observation correction models [4][5][6] or onboard observations from low-earth orbits [7] and MEO satellites [8]. With the adoption of the empirically derived SRP model for BDS GEO satellites, the radial orbit accuracy reached 10 cm as validated by Satellite Laser Ranging (SLR) [3].…”

Section: Introductionmentioning

confidence: 99%

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Improving the Orbits of the BDS-2 IGSO and MEO Satellites with Compensating Thermal Radiation Pressure Parameters

et al. 2022

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The orbit accuracy of the navigation satellites relies on the accurate knowledge of the forces on the spacecraft, in particular the non-conservative perturbations. This study focuses on the Inclined Geosynchronous Orbit (IGSO) and Medium Earth Orbit (MEO) satellites of the regional Chinese BeiDou Navigation Satellite System (BDS-2), for which apparent deficiencies of non-conservative models are identified and evidenced in the Satellite Laser Ranging (SLR) residuals. The orbit errors derived from the empirical 5-parameter Extended CODE Orbit Model (ECOM) as well as a semi-analytical adjustable box-wing model show prominent dependency on the Sun elongation angle, even in the yaw-steering attitude mode. Hence, a periodic acceleration in the normal direction of the +X surface, presumably generated by the mismodeled thermal radiation pressure, is introduced. The SLR validations reveal that the Sun elongation angle-dependent systematic errors were significantly reduced, and the orbit accuracy was improved by 10–30% to approximately 4.5 cm and 3.0 cm for the BDS-2 IGSO and MEO satellites, respectively.

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“…Since TRR and SRP show similar characteristics that originated from the Sun, the former is often incorporated with SRP in a combined form as done in Equation (6). Ref.…”

Section: Thermal Radiation Pressurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improving the Orbits of the BDS-2 IGSO and MEO Satellites with Compensating Thermal Radiation Pressure Parameters

et al. 2022

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“…As GNSS moves towards multi-system integration, the MGEX project [28], aiming at the continuous tracking, collection and analysis of all GNSS (GPS, GLONASS, Galileo, BDS) and RNSS (QZSS) satellites, has been continuously expanded and improved. Currently, there are seven analysis centers capable of providing multi-system precise satellite orbit and clock products, including CNES/Collecte Localisation Satellites (CLS)/Groupe de Recherche de Géodésie Spatiale (GRGS) [29], Center for Orbit Determination in Europe (CODE) [30], GFZ [31], Information and Analysis Center (IAC) [32], Japan Aerospace Exploration Agency (JAXA) [33], Shanghai Observatory (SHAO) [34] and WHU [35]. It should be noted that the analysis center Technische Universität München (TUM) has no longer provided the precise products for MGEX project since 10 November 2019.…”

Section: Precise Products For Bds Gps Glonass Galileo and Qzssmentioning

confidence: 99%

Precise Point Positioning with Almost Fully Deployed BDS-3, BDS-2, GPS, GLONASS, Galileo and QZSS Using Precise Products from Different Analysis Centers

Pan

2021

Remote Sensing

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The space segment of all the five satellite systems capable of providing precise position services, namely BeiDou Navigation Satellite System (BDS) (including BDS-3 and BDS-2), Global Positioning System (GPS), GLObal NAvigation Satellite System (GLONASS), Galileo and Quasi-Zenith Satellite System (QZSS), has almost been fully deployed at present, and the number of available satellites is approximately 136. Currently, the precise satellite orbit and clock products from the analysis centers European Space Agency (ESA), GeoForschungsZentrum Potsdam (GFZ) and Wuhan University (WHU) can support all five satellite systems. Thus, it is necessary to investigate the positioning performance of a five-system integrated precise point positioning (PPP) (i.e., GRECJ-PPP) using the precise products from different analysis centers under the current constellation status. It should be noted that this study only focuses on the long-term performance of PPP based on daily observations. The static GRECJ-PPP can provide a convergence time of 5.9–6.9/2.6–3.1/6.3–7.1 min and a positioning accuracy of 0.2–0.3/0.2–0.3/1.0–1.1 cm in east/north/up directions, respectively, while the corresponding kinematic statistics are 6.8–8.6/3.3–4.0/7.8–8.1 min and 1.0–1.1/0.8/2.5–2.6 cm in three directions, respectively. For completeness, although the real-time precise products from the analysis center Centre National d’Etudes Spatiales (CNES) do not incorporate QZSS satellites, the performance of real-time PPP with the other four satellite systems (i.e., GREC-PPP) is also analyzed. The real-time GREC-PPP can achieve a static convergence time of 8.7/5.2/11.2 min, a static positioning accuracy of 0.6/0.8/1.3 cm, a kinematic convergence time of 11.5/6.9/13.0 min, and a kinematic positioning accuracy of 1.7/1.6/3.6 cm in the three directions, respectively. For comparison, the results of single-system and dual-system PPP are also provided. In addition, the consistency of the precise products from different analysis centers is characterized.

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“…The MGEX provides observations, clock and orbit files, DCBs (Differential Clock Biases), and broadcast ephemeris [9,10]. In recent years, multiple studies concerning the analysis of clock or orbit products of four GNSS systems have been conducted, e.g., by analysing rapid products [11], considering the correction of inter-satellite code biases [12], prediction models of GNSS satellite clock errors [13], and assessment of multi-GNSS precise orbit and clock products from different analysis centres [14]. Other authors also Sensors 2024, 24, 799 2 of 9 analysed different aspects using raw clock products from MGEX, like clock estimation using the dual-thread parallel method [15], or by methods of removing day-boundary discontinuities on GNSS clocks [16] or impact of satellite clock offset on differential code biases estimation using undifferenced GPS triple-frequency observations [17].…”

Section: Introductionmentioning

confidence: 99%

A Study of Outliers in GNSS Clock Products

Maciuk,

Varna,

Krzykowska-Piotrowska

2024

Sensors

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Time is an extremely important element in the field of GNSS positioning. In precise positioning with a single-centimetre accuracy, satellite clock corrections are used. In this article, the longest available data set of satellite clock corrections of four GNSS systems from 2014 to 2021 was analysed. This study covers the determination of the quality (outliers number and magnitude), availability, stability, and determination of the specificity and nature of the clock correction for each satellite system. One problem with the two newest satellite systems (Galileo and BeiDou) is the lack of availability of satellite signals in the early years of the analysis. These data were available only in the later years of the period covered by the analysis, as most of the satellites have only been in orbit since 2018–2019. Interestingly, the percentage of outlying observations was highest in Galileo and lowest in BeiDou. Phase and frequency plots showed a significant number of outlying observations. On the other hand, after eliminating outlying observations, each system showed a characteristic graph waveform. The most consistent and stable satellite clock corrections are provided by the GPS and GLONASS systems. The main problems discussed in this paper are the determination of the number and magnitude of outliers in clock products of four GNSS systems (GPS, GLONASS, Galileo, Beidou) and the study on the long-term stability of GNSS clocks analysis, which covers the years 2014–2021.

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Accuracy Analysis of GNSS Hourly Ultra-Rapid Orbit and Clock Products from SHAO AC of iGMAS

Cited by 19 publications

References 27 publications

Improving the Orbits of the BDS-2 IGSO and MEO Satellites with Compensating Thermal Radiation Pressure Parameters

Improving the Orbits of the BDS-2 IGSO and MEO Satellites with Compensating Thermal Radiation Pressure Parameters

Precise Point Positioning with Almost Fully Deployed BDS-3, BDS-2, GPS, GLONASS, Galileo and QZSS Using Precise Products from Different Analysis Centers

A Study of Outliers in GNSS Clock Products

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