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22
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Introduction
Geodesist working in fields of space geodesy and astrodynamics with expertise in precise orbit determination and gravity field modelling. Currently, working on advanced concepts of future gravity missions and the Orbital Space exploration with a focus on Low Earth Orbiters and space debris.
Creator of the GEORB (Gravity and Precise Orbit Determination system), an open source software for precise orbit determination of LEOs, gravity field modelling and space mission design.
Additional affiliations
December 2020 - November 2023
June 2015 - November 2020
January 2008 - May 2015
Publications
Publications (22)
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. Gravit...
Precise orbit determination is a major objective in satellite geodesy and data analysis of several satellite missions observing Earth or another planet. Satellite gravity missions such as the Gravity Recovery And Climate Experiment (GRACE) Follow-On mission, require high level of orbit precision (cm level) in order to capture the gravity field mode...
Gravity and precisE ORBit determination system (GEORB) is a software for precise orbit determination of low Earth orbiters, gravity field recovery based on satellite gravity missions and orbit design of future space missions. GEORB has been applied in orbit determination of the Gravity Recovery And Climate Experiment (GRACE), GRACE Follow-On (GRACE...
DORUS time-variable gravity models based on GRACE Follow-On mission data analysis (orbit and inter satellite laser ranging data), as produced by the GEORB software system.
Precise orbit data and Gravity field models for the GRACE Follow-On satellite mission as produced by the GEORB software system. Sample dataset of precise orbits of the GRACE-FO satellites and one weekly gravity field solution "DORUS_GRACE-FO_59412-59418.gfc".
Precise orbit determination is a major objective in satellite geodesy and data analysis of several geoscientific satellite missions. Satellite gravity missions such as the Gravity Recovery And Climate Experiment (GRACE) missions (GRACE-FO and GRACE) are equipped with on-board accelerometers that form a key observation instrument for the measurement...
Ocean tides produce significant gravitational perturbations that affect near‐Earth orbiting spacecraft. The gravitational potential induced by tidal mass redistribution is routinely modeled for global gravity analysis and orbit determination, although generally by assuming a spherical Earth and a uniform seawater density. The inadequacy of these si...
Real-time GNSS precise positioning has many societally important applications, such as geohazard monitoring (earthquake, volcano, tsunami early warning), real-time ionospheric and tropospheric monitoring, autonomous navigation and surveying and mapping. At Geoscience Australia, we are currently developing an Analysis Centre Software (ACS) package f...
Precise orbit determination and prediction are major objectives underlying in all real-time GNSS applications. The
accuracy of the GNSS predicted orbits is critical in the case of high precision approaches such as the Precise Point
Positioning (PPP) method. The current study focuses on GNSS orbit propagation based on full force model and the
use of...
An analysis of current static and time-variable gravity field models is presented focusing on the medium to high frequencies of the geopotential as expressed by the spherical harmonic coefficients. A validation scheme of the gravity field models is implemented based on dynamic orbit determination that is applied in a degree-wise cumulative sense of...
The yaw-attitude modelling of GNSS satellites is a critical objective underlying the phase wind-up (PWU) correction and orbit determination. The attitude mis-modelling during the eclipse seasons may lead to a significant impact in the Precise Point Positioning (PPP), applications with demanding availability requirements. The current study focuses o...
The mathematical model of parameter estimation in the frame of dynamic orbit determination includes numerical integration of the equation of motion and implementation of the explicit form of the variational equations. We focus on Gravity Field and Steady-State Ocean Circulation (GOCE) and Gravity Recovery And Climate Experiment (GRACE) orbit analys...
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 prin...
The role of gravity models is fundamental in satellite orbit determination representing the dynamical contribution of the observed gravity field in the equation of motion. We examine the validation of gravity models by implementing numerically an adapted dynamic orbit determination algorithm. We focus on GOCE (Gravity field and steady-state Ocean C...
The procedure of satellite orbit analysis apart from its significance in orbit dynamics can be also used as an independent assessment tool for the available Earth gravity models. The contribution of these models, which represent the main gravitational component in dynamic orbit computations, can be performed in a degree-wise cumulative sense, thus...
The present study aims at the validation of global gravity field models through numerical investigation in gravity filed functionals based on spherical harmonic synthesis of the geopotential models and the analysis of terrestrial data. We examine current gravity models based on the GOCE (Gravity field and steady-state Ocean Circulation Explorer) an...
Satellite orbit modelling and determination is one of the fundamental fields in space geodesy since the era of the first artificial satellites till the current satellite missions’ period. Orbit parameterization along with the space-geodetic observations focuses in the three pillars of geodesy i.e. the reference system, the gravity field and Earth’s...
Dynamic orbit determination is based on the solution of the equation of motion and the accurate modeling of all forces acting on the satellite. The present contribution aims at investigating the role of a geopotential model which is used to evaluate the Earth’s gravitational component in the procedure of dynamic orbit determination. For this reason...
The increasing number of new satellite-only and combined earth gravity models in terms of sets of potential harmonic coefficients up to a truncated maximum degree and order, that are becoming available either from the sole analysis of satellite tracking, accelerometry or gradiometry data, or from the combination of satellite data with terrestrial i...