Dynamic orbit parameterization and assessment in the frame of current GOCE gravity models

Papanikolaou, Thomas; Tsoulis, Dimitrios

doi:10.1016/j.pepi.2014.08.003

Cited by 6 publications

(14 citation statements)

References 18 publications

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“…Nevertheless, the space-wise model has yielded low performance in the analysis of the GRACE satellites orbit and inter-satellite K-band ranging (KBR) observations (Papanikolaou and Tsoulis 2014). The analysis of the GPS/levelling data reveals systematic errors that can be absorbed through the estimation of a constant bias (Table 2).…”

Section: Computing and Resultsmentioning

confidence: 99%

“…The assessment of global gravity models may be investigated by a variety of quality tests such as the analysis of satellite orbits and terrestrial data (Förste et al 2008, Arabelos and Tscherning 2010, Tapley et al 2005, Featherstone 2001, Lemoine et al 1998, Perosanz et al 1997, space-borne data analysis (Hashemi Farahani et al 2013a, Papanikolaou andTsoulis 2014) or even spectral assessment and error analysis of the harmonics coefficients Patlakis 2013, Baur et al 2014). …”

Section: Introductionmentioning

confidence: 99%

“…The aforementioned degree-wise cumulative approach has been previously applied for global gravity models validation through a scheme of dynamic orbit analysis by Papanikolaou and Tsoulis (2014).…”

Section: Introductionmentioning

confidence: 99%

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High-frequency analysis of Earth gravity field models based on terrestrial gravity and GPS/levelling data: a case study in Greece

Papanikolaou¹,

Papadopoulos²

2015

Journal of Geodetic Science

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The present study aims at the validation of global gravity field models through numerical investigation in gravity field functionals based on spherical harmonic synthesis of the geopotential models and the analysis of terrestrial data. We examine gravity models produced according to the latest approaches for gravity field recovery based on the principles of the Gravity field and steadystate Ocean Circulation Explorer (GOCE) and Gravity Recovery And Climate Experiment (GRACE) satellite missions. Furthermore, we evaluate the overall spectrum of the ultra-high degree combined gravity models EGM2008 and EIGEN-6C3stat. The terrestrial data consist of gravity and collocated GPS/levelling data in the overall Hellenic region. The software presented here implements the algorithm of spherical harmonic synthesis in a degree-wise cumulative sense. This approach may quantify the bandlimited performance of the individual models by monitoring the degree-wise computed functionals against the terrestrial data. The degree-wise analysis performed yields insight in the short-wavelengths of the Earth gravity field as these are expressed by the high degree harmonics.

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Section: Computing and Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High-frequency analysis of Earth gravity field models based on terrestrial gravity and GPS/levelling data: a case study in Greece

Papanikolaou¹,

Papadopoulos²

2015

Journal of Geodetic Science

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“…Our software has been developed by Papanikolaou (2012) in Matlab and C (minor part) while the current version implements the dynamic orbit modelling as summarized in Table 2. The performed computations consider the Matlab double precision (64 bits) floating point numerical representation.…”

Section: Goce and Grace Orbit Analysismentioning

confidence: 99%

“…The basic data which were considered, are briefly described here. The detailed GRACE and GOCE data processing which is implemented here follows the standard procedures that are documented in the relevant literature (Papanikolaou and Tsoulis 2014;Papanikolaou 2012). For the case of GRACE, it incorporates the corrections to the initial KBR observations (Case et al 2010) as well as the use of precise calibration parameters for the accelerometers provided by the TU Delft thermosphere web server thermosphere.tudelft.nl Helleputte et al 2009).…”

Section: Goce and Grace Orbit Analysismentioning

confidence: 99%

Assessment of numerical integration methods in the context of low Earth orbits and inter-satellite observation analysis

Papanikolaou

Tsoulis

2016

Acta Geod Geophys

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The integration of differential equations is a fundamental tool in the problem of orbit determination. In the present study, we focus on the accuracy assessment of numerical integrators in what refers to the categories of single-step and multistep methods. The investigation is performed in the frame of current satellite gravity missions i.e. Gravity Recovery and Climate Experiment (GRACE) and Gravity Field and steady-state Ocean Circulation Explorer (GOCE). Precise orbit determination is required at the level of a few cm in order to satisfy the primary missions' scope which is the rigorous modelling of the Earth's gravity field. Therefore, the orbit integration errors are critical for these low earth orbiters. As the result of different schemes of numerical integration is strongly affected by the forces acting on the satellites, various validation tests are performed for their accuracy assessment. The performance of the numerical methods is tested in the analysis of Keplerian orbits as well as in real dynamic orbit determination of GRACE and GOCE satellites by taking into account their sophisticated observation techniques and orbit design. Numerical investigation is performed in a wide range of the fundamental integrators' parameters i.e. the integration step and the order of the multistep methods.

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Assessment of chosen GRACE-related gravity models based on the GOCE satellite precise science orbit

Bobojć

2019

Acta Geophys.

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Eight selected geopotential models obtained through the International Center for Global Earth Models were used in the dynamic orbit determination process of the satellite of the Gravity Field and Steady-State Ocean Circulation Explorer (GOCE) mission. For the estimation of various GOCE orbital arc variants, the following gravity models were taken into account: HUST-GRACE2016S, ITU_GRACE16, ITSG-GRACE2014S, ITSG-GRACE2014K, TONGJI-GRACE01, EIGEN-51C, EIGEN5S, EGM2008. The official kinematic and reduced-dynamic precise science orbit (PSO) of the GOCE satellite received via the European Space Agency was adopted as the reference orbit. Cartesian coordinates of the GOCE satellite in this orbit were treated as pseudo-observations in the estimation process using the classical least-squares method. The estimated orbital arcs were fitted to the corresponding arcs of the reference orbit. This allowed the values of 3D root-mean-square (RMS) of the distance between the estimated and reference arcs to be computed. The averages for these 3D RMS values, computed for ten and fifty orbital arcs, made it possible to compare the orbital performance of selected gravity models. Additionally, the fit to both types of the GOCE PSO, i.e., the kinematic orbit and the reduced-dynamic orbit made it possible to compare their quality. Investigation of the gravity model performance was also the opportunity to describe the effectiveness of dynamic orbit determination solutions, depending on the estimated arc lengths, type of reference orbit and the use (or not) of the background models.

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Dynamic orbit parameterization and assessment in the frame of current GOCE gravity models

Cited by 6 publications

References 18 publications

High-frequency analysis of Earth gravity field models based on terrestrial gravity and GPS/levelling data: a case study in Greece

High-frequency analysis of Earth gravity field models based on terrestrial gravity and GPS/levelling data: a case study in Greece

Assessment of numerical integration methods in the context of low Earth orbits and inter-satellite observation analysis

Assessment of chosen GRACE-related gravity models based on the GOCE satellite precise science orbit

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