Stefan Hackel

TL;DR: A refined strategy for carrier phase generation out of low-level measurements is employed to cope with half-cycle ambiguities in the tracking of the Sentinel-3 GPS receiver that have so far inhibited ambiguity-fixed POD solutions.

TL;DR: In this article, a parameter estimation approach is presented to investigate systematic orbit errors and it is shown that SLR validation of LEO satellites is not only able to detect radial but also along-track and cross-track offsets.

TL;DR: The 5 cm orbit accuracy requirement in 3D is fulfilled according to the results of the orbit comparisons between the different orbit solutions from the QWG, and an error in the given geometry information about the satellite is found.

TL;DR: In this paper, the first 4 years of the Swarm mission have been generated from onboard GPS measurements in a systematic reprocessing using refined models and processing techniques, including macro-models for a more elaborate non-gravitational force modeling (solar radiation pressure, atmospheric drag and lift, earth albedo), as well as carrier phase ambiguity fixing.

TL;DR: In this article, the benefits of refined dynamical models on orbit accuracy as well as estimated empirical accelerations and compares different dynamic models in a reduced-dynamic (RD) orbit determination are discussed.