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Dirkx, Nic (author), Tiels, Koen (author), Oomen, T.A.E. (author)Frequency response function (FRF) estimation from measured data is an essential step in the design, control, and analysis of complex dynamical systems, including thermal and motion systems. Especially for systems that require long measurement time, missing samples in the data record, e.g., due to measurement interruptions, often occur. The...journal article 2023
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Hu, Xuanyu (author), Stark, Alexander (author), Dirkx, D. (author), Hussmann, Hauke (author), Fienga, Agnès (author), Briaud, Arthur (author), Mémin, Anthony (author), Melini, Daniele (author), Fayolle-Chambe, M.S. (author)We investigate the impact of viscoelastic tidal deformation of the Moon on the motion of a polar orbiter. The dissipative effects in the Moon’s interior, i.e., tidal phase lags, are modeled as Fourier series sampled at given frequencies associated with linear combinations of Delaunay arguments, the fundamental parameters describing the lunar...journal article 2023
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Wörner, L. (author), Root, B.C. (author), Bouyer, P. (author), Braxmaier, C. (author), Dirkx, D. (author), De Teixeira Da Encarnação, J. (author), Hauber, E. (author), Hussmann, H. (author)The aim of this paper is to present the concept of a dedicated gravity field mission for the planet Mars, the Mars Quantum Gravity Mission (MaQuIs). The mission is targeted at improving the data on the gravitational field of Mars, enabling studies on planetary dynamics, seasonal changes, and subsurface water reservoirs. MaQuIs follows well...journal article 2023
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Gurvits, L. (author), Cimò, Giuseppe (author), Dirkx, D. (author), Pallichadath, V. (author), Altobelli, Nicolas (author), Bocanegra Bahamon, T.M. (author), Cazaux, S.M. (author), Vermeersen, L.L.A. (author), Visser, P.N.A.M. (author)Planetary Radio Interferometry and Doppler Experiment (PRIDE) is a multi-purpose experimental technique aimed at enhancing the science return of planetary missions. The technique exploits the science payload and spacecraft service systems without requiring a dedicated onboard instrumentation or imposing on the existing instrumentation any...review 2023
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Kleisioti, E. (author), Dirkx, D. (author), Rovira Navarro, M. (author), Kenworthy, M.A. (author)Context. Exomoons are expected to orbit gas giant exoplanets just as moons orbit Solar System planets. Tidal heating is present in Solar System satellites, and it can heat up their interior, depending on their orbital and interior properties. Aims. We aim to identify a tidally heated exomoon's (THEM) orbital parameter space that would make it...journal article 2023
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Fayolle-Chambe, M.S. (author), Lainey, V. (author), Dirkx, D. (author), Gurvits, L. (author), Cimo, G. (author), Bolton, S. J. (author)Context. Stellar occultations currently provide the most accurate ground-based measurements of the positions of natural satellites (down to a few kilometres for the Galilean moons). However, when using these observations in the calculation of satellite ephemerides, the uncertainty in the planetary ephemerides dominates the error budget of the...journal article 2023
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Fayolle-Chambe, M.S. (author), Magnanini, A. (author), Lainey, V. (author), Dirkx, D. (author), Zannoni, M. (author), Tortora, P. (author)Context. The upcoming JUICE and Europa Clipper missions targeting Jupiter s Galilean satellites will provide radio science tracking measurements of both spacecraft. Such data are expected to significantly help estimating the moons ephemerides and related dynamical parameters (e.g. tidal dissipation parameters). However, the two missions will...journal article 2023
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Dirkx, Nic (author), Tiels, Koen (author), Oomen, T.A.E. (author)Optimal input design plays an important role in system identification for complex and multivariable systems. A known paradox in input design is that the optimal inputs depend on the true but unknown system. The aim of this paper is to design inputs for multivariable systems that are robust to all system variations within a given continuous...conference paper 2023
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Dirkx, Nic (author), Tiels, Koen (author), Oomen, T.A.E. (author)Frequency Response Matrix (FRM) estimation from measured data is an important step towards the control of complex systems, including motion and thermal systems. Missing samples in the measured data records, e.g., due to sensor failure or faulty data transmission, often occur. In this paper, a method is presented for the nonparametric FRM...journal article 2023
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Dirkx, Nic (author), Bosselaar, Marcel (author), Oomen, T.A.E. (author)Handling peak amplitude constraints, or equivalently l∞-norm constraints, is an important application demand in experiment design for system identification. The aim of this letter is to present a method for the design of excitation signals with prescribed power spectrum under l∞-norm constraints for systems with many inputs and outputs. The...journal article 2022
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Dirkx, Nic (author), Tiels, Koen (author), Oomen, T.A.E. (author)Frequency Response Function (FRF) identification plays a crucial role in the design, the control, and the analysis of complex dynamical systems, including thermal and motion systems. Especially for applications that require long measurements, missing data samples, e.g., due to interruptions in the data transmission or sensor failure, often...journal article 2022
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van der Zwaard, R.K. (author), Dirkx, D. (author)When the BepiColombo spacecraft arrives at Mercury in late 2025, it will be able to measure the orbit of the planet with unprecedented accuracy, allowing for more accurate measurements of the perihelion advance of the planet, as predicted by the Theory of General Relativity (GR). A similar effect is produced by the gravitational oblateness of...journal article 2022
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Plumaris, M.K. (author), Dirkx, D. (author), Siemes, C. (author), Carraz, Olivier (author)Interplanetary missions have typically relied on Radio Science (RS) to recover gravity fields by detecting their signatures on the spacecraft trajectory. The weak gravitational fields of small bodies, coupled with the prominent influence of confounding accelerations, hinder the efficacy of this method. Meanwhile, quantum sensors based on Cold...journal article 2022
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Fayolle-Chambe, M.S. (author), Dirkx, D. (author), Lainey, V. (author), Gurvits, L. (author), Visser, P.N.A.M. (author)When reconstructing natural satellites' ephemerides from space missions' tracking data, the dynamics of the spacecraft and natural bodies are often solved for separately, in a decoupled manner. Alternatively, the ephemeris generation and spacecraft orbit determination can be performed concurrently. This method directly maps the available data...journal article 2022
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Fayolle-Chambe, M.S. (author), Dirkx, D. (author), Visser, P.N.A.M. (author), Lainey, V. (author)Context. The apparent close encounters of two satellites in the plane of the sky, called mutual approximations, have been suggested as a different type of astrometric observation to refine the moons' ephemerides. The main observables are then the central instants of the close encounters, which have the advantage of being free of any scaling...journal article 2021
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Rovira Navarro, M. (author), van der Wal, W. (author), Steinke, T. (author), Dirkx, D. (author)Thousands of exoplanets have been discovered; however, the detection of exomoons remains elusive. Tidally heated exomoons have been proposed as candidate targets for observation; vigorous tidal dissipation can raise the moon's surface temperature, making direct imaging possible, and cause widespread volcanism that can have a signature in...journal article 2021
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Pallichadath, V. (author), Gurvits, L. (author), Dirkx, D. (author), Vermeersen, L.L.A. (author)Planetary Radio Interferometry and Doppler Experiment (PRIDE) will exploit the signal recording and processing technology developed originally for Very Lonag Baseline interferometric (VLBI). The essence of PRIDE is in observing the spacecraft radio signal with a network of Earth-based radio telescopes. The PRIDE technique developed at the Joint...abstract 2020
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Speretta, S. (author), Oei, Hong Yang (author), Verhoeven, C.J.M. (author), Dirkx, D. (author), Karunanithi, Visweswaran (author), Bentum, Mark (author), Miraglia, Antonio (author), Rotteveel, Jeroen (author), Alvarez, Marco (author)This paper presents a software-defined testbed to perform hardware-in-The-loop test of miniaturized coherent transponders. Such a setup has been designed to minimize the access threshold for future users, heavily relying on available open source applications and commercial hardware, targeting future coherent transponders for interplanetary...conference paper 2019
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Dirkx, D. (author), Mooij, E. (author), Root, B.C. (author)Next-generation planetary tracking methods, such as interplanetary laser ranging (ILR) and same-beam interferometry (SBI) promise an orders-of-magnitude increase in the accuracy of measurements of solar system dynamics. This requires a reconsideration of modelling strategies for the translational and rotational dynamics of natural bodies, to...journal article 2019
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Pallichadath, V. (author), Bocanegra Bahamon, T.M. (author), Dirkx, D. (author), Gurvits, L. (author), Vermeersen, L.L.A. (author)Planetary Radio Interferometry and Doppler Experiment (PRIDE) is a multi-purpose experimental technique aimed at enhancing the science return of planetary missions. It is based on, the near-field phase-referencing VLBI (Very Long Baseline Interferometry) and radial Doppler measurements. It has been developed initially by the Joint Institute for...poster 2018
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