The adjusted optical properties for Galileo/BeiDou-2/QZS-1 satellites and initial results on BeiDou-3e and QZS-2 satellites

Duan, Bingbing; Hugentobler, Urs; Selmke, Inga

doi:10.1016/j.asr.2018.11.007

Cited by 35 publications

(20 citation statements)

References 23 publications

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“…For such a geometry, the STD of SLR residuals is mitigated from 36.5 mm for the solution E2, to 24.7 mm for the solution B1, and to 23.3 mm for the solution B0. The hybrid solutions B0 and B1 provide the Galileo-FOC orbit accuracy, as measured by SLR, at the level of 25.3 and 25.0 mm, respectively, which is by 9 mm better than obtained by Li et al (2019) and by 17 mm better than given by Duan et al (2018). We also checked the stability of the orbit predictions calculated based on particular solutions.…”

Section: Discussion and Summarymentioning

confidence: 90%

“…Such a hybrid model has also been developed for the BeiDou Geostationary Earth Orbit satellites (Wang et al 2018) and the very first satellite of the Japanese Quasi-Zenith Satellite System (QZSS), the QZS-1 (Montenbruck et al 2017a). Duan et al (2018) performed the evaluation of the optical properties for Galileo satellites and indicated only little corrections for the official parameters. Therefore, we present the a priori box-wing model for the Galileo satellites, based on the official parameters released by the European Global Navigation Satellite Systems Agency (GSA).…”

Section: Pseudo Stochastic Pulsesmentioning

confidence: 99%

“…Therefore, we present the a priori box-wing model for the Galileo satellites, based on the official parameters released by the European Global Navigation Satellite Systems Agency (GSA). In the case of the Galileo metadata usage, Duan et al (2018), in the best case, obtained the RMS of SLR residuals at the level of 42 mm for the solution based on the box-wing model with the estimation of the classical ECOM. Li et al (2019) performed the Galileo-FOC orbit determination using the box-wing model together with ECOM and obtained the STD of the SLR residuals at the level of 34 mm for the Galileo-FOC satellites.…”

Section: Pseudo Stochastic Pulsesmentioning

confidence: 99%

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Accounting for perturbing forces acting on Galileo using a box-wing model

2019

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In November 2017, the European Global Navigation Satellite System Agency (GSA) released geometrical and optical information for the Galileo satellites which allowed for the composition of a box-wing model whose main goal is absorption of the direct solar radiation pressure, earth's albedo, and infrared radiation. In order to evaluate the efficiency of the box-wing model, we test solutions based solely on the empirical models, the pure analytical box-wing model, and a series of hybrid models including the box-wing with different sets of additionally estimated empirical parameters. The hybrid solution, which is based on the box-wing model and on a reduced number of estimated empirical parameters, substantially reduces variabilities of the satellite laser ranging (SLR) residuals, especially for the low elevation angles of the sun above the orbital plane (β), i.e., for eclipsing Galileo satellites. The standard deviation of SLR residuals for |β| < 12.3° decreases from 37 to 25 mm between the solution based on the ECOM2 and the hybrid solution, respectively. We found significant mitigation of the spurious geocenter signal in the Z component and its formal errors, when reducing the number of estimated empirical parameters, and a substantial reduction of the dependency between geocenter coordinates, the geometry of Galileo orbital planes, and the position of the sun. The hybrid box-wing solution with a reduced set of empirical parameters provides thus the best solution for precise orbit determination, orbit predictions, and estimation of geodetic parameters.

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Section: Discussion and Summarymentioning

confidence: 90%

Section: Pseudo Stochastic Pulsesmentioning

confidence: 99%

Section: Pseudo Stochastic Pulsesmentioning

confidence: 99%

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Accounting for perturbing forces acting on Galileo using a box-wing model

2019

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“…When the optical properties are unknown, it is possible to formulate the approximate cuboid box-wing model such as the one provided by Montenbruck et al (2015a) The feasible usage of the analytical or semi-analytical models for the Galileo satellites is possible since late 2017 when GSA released the physical properties for the Galileo constellation. 1 Tests of the optical properties were performed by Duan et al (2018), whereas the overview of the precise orbit determination strategies based on the Galileo metadata are studied by Bury et al (2019) and Li et al (2019). Based on the optical properties, it is possible to evaluate the accelerations resulting from SRP, albedo, and IR and take them into account for the Galileo precise orbit determination (Rodriguez-Solano et al 2012b).…”

Section: Non-gravitational Forces Acting On Gnss Satellitesmentioning

confidence: 99%

Toward the 1-cm Galileo orbits: challenges in modeling of perturbing forces

Bury

Sośnica

Zajdel

et al. 2020

J Geod

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Precise orbit determination demands knowledge of perturbing forces acting on the satellites of the Global Navigation Satellite Systems (GNSS). The metadata published by the European GNSS Agency for the Galileo satellites allow for the composition of the analytical box-wing model dedicated for coping with the direct solar radiation pressure (SRP), albedo, and infrared radiation (IR). Based on the box-wing model, we evaluated both the magnitude and the characteristic periods of accelerations caused by all the aforementioned forces. We assess which perturbations can be absorbed by the extended Empirical CODE Orbit Model (ECOM2) and what are the consequences of neglecting higher-order ECOM2 coefficients. In order to evaluate the impact of SRP, albedo, IR, and the navigation antenna thrust, we perform a series of precise Galileo orbit determination strategies for Galileo In-Orbit-Validation (IOV), Full Operational Capability (FOC), and two FOC satellites launched into eccentric orbits. The proposed box-wing model is capable of absorbing approximately 97% of the SRP in the Sun-satellite direction, whereas the rest can be mitigated by an additionally estimated small set of empirical parameters. The purely physical box-wing model does not fully handle satellite misorientation and re-radiation effects, such as Y -bias, solar panel rotation lag, that is the misalignment causing a constant acceleration perpendicular to the solar panel axis and the direction to the Sun. However, the box-wing model is especially crucial in terms of the absorption of the higher-order terms of SRP and stabilizes the orbit solutions during the eclipsing periods. Based on the SLR residual analysis, we found a systematic effect at the level up to 50 mm resulting from the omission of the high-order empirical orbit coefficients. We also found that the impact of the albedo, IR, and transmitter antenna thrust on the Galileo orbits reach the level of 5, 14, and 20 mm, respectively. Eventually, we obtain the overall accuracy of the Galileo-FOC orbits at the level of 22.5 mm, even for the eclipsing period for the solution which considers the box-wing model with the estimation of the constant empirical accelerations.

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“…Abbreviations used: Center for Orbit Determination in Europe (CODE, Prange et al 2017); Centre National d'Etudes Spatiales (CNES/CLS, Katsigianni et al 2019); GeoForschungsZentrum Potsdam (GFZ, Uhlemann et al 2016); Shanghai Observatory (SHAO); Japan Aerospace Exploration Agency (JAXA); Natural Resources Canada (NRC); European Space Agency (ESA); Jet Propulsion Laboratory (JPL); NOAA/National Geodetic Survey (NGS); Scripps Institution of Oceanography (SIO); Massachusetts Institute of Technology (MIT); Russian Mission Control Center (MCC); Russian Informational Analytical Center (IAC); Technical University of Munich (TUM,Duan et al 2019). The description of the processing strategies at different IGS analysis centers can be found in Montenbruck (2017, 2019),Li et al (2015),Weiss et al (2017), and Villiger and …”

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confidence: 99%

Quality assessment of experimental IGS multi-GNSS combined orbits

et al. 2020

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The International GNSS Service (IGS) Analysis Center Coordinator initiated in 2019 an experimental multi-GNSS orbit combination service by adapting the current combination software that has been used for many years for IGS GPS and GLONASS combinations. The multi-GNSS orbits are based on individual products generated by IGS and multi-GNSS Pilot Project analysis centers. However, the combinations are not yet considered to be the final products at this time. The goal of this research is to provide a quality assessment of the very first IGS experimental multi-GNSS combined orbits based on Satellite Laser Ranging (SLR) observations and the mean position errors from the orbit combinations. The errors available in the combined orbit files provide information about the consistency between orbits from different analysis centers, whereas SLR provides independent orbit validation results even for those satellites which are considered only by one analysis center, and thus, the quality of the combination is not provided in the orbit files. We found that the BeiDou-3 satellites manufactured by China Academy of Space Technology and Shanghai Engineering Center for Microsatellites are characterized by opposite SLR residual dependencies with respect to the position of the sun which means that the orbit models for BeiDou-3 need further improvement. Smallest SLR residuals are obtained for Galileo, GLONASS-K1, and GLONASS-M+. However, the latter is characterized by a bias of + 29 mm. The mean standard deviations of SLR residuals are 23, 29, 87, 51, 40, and 72 mm for Galileo, GLONASS, BeiDou GEO, BeiDou IGSO, BeiDou MEO, and QZSS, respectively. The mean orbit combination errors in the radial direction are three times lower than those from SLR residuals in the case of MEO satellites and vary between 8 and 14 mm, whereas the orbit errors are four times lower than SLR residuals in the case of GEO and IGSO and equal to 11-21 mm.

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The adjusted optical properties for Galileo/BeiDou-2/QZS-1 satellites and initial results on BeiDou-3e and QZS-2 satellites

Cited by 35 publications

References 23 publications

Accounting for perturbing forces acting on Galileo using a box-wing model

Accounting for perturbing forces acting on Galileo using a box-wing model

Toward the 1-cm Galileo orbits: challenges in modeling of perturbing forces

Quality assessment of experimental IGS multi-GNSS combined orbits

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