4 papers
Atmospheric Density Uncertainty Quantification for Satellite Conjunction Assessment
David J. Gondelach, Richard Linares
Conjunction assessment requires knowledge of the uncertainty in the predicted orbit. Errors in the atmospheric density are a major source of error in the prediction of low Earth or…
Real-Time Thermospheric Density Estimation Via Two-Line-Element Data Assimilation
David Gondelach, Richard Linares
Inaccurate estimates of the thermospheric density are a major source of error in low Earth orbit prediction. To improve orbit prediction, real-time density estimation is required.…
On the predictability of Galileo disposal orbits
David J. Gondelach, Roberto Armellin, Alexander Wittig
The end-of-life disposal of Galileo satellites is needed to avoid collisions with operational spacecraft and to prevent the generation of space debris. Either disposal in stable gr…
Element sets for high-order Poincaré mapping of perturbed Keplerian motion
David J. Gondelach, Roberto Armellin
The propagation and Poincaré mapping of perturbed Keplerian motion is a key topic in celestial mechanics and astrodynamics, e.g. to study the stability of orbits or design bounded…