Journal ArticleDOI
Robust and precise baseline determination of distributed spacecraft in LEO
TLDR
A strategy based on a reduced-dynamics filtering of dual-frequency GPS measurements for precise baseline determination along with a dedicated scheme for integer ambiguity resolution is proposed, consisting of a hybrid sequential/batch algorithm based on the maximum a posteriori and integer aperture estimators.About:
This article is published in Advances in Space Research.The article was published on 2016-01-01. It has received 35 citations till now. The article focuses on the topics: Robustness (computer science).read more
Citations
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Journal ArticleDOI
Precise orbit determination of the Sentinel-3A altimetry satellite using ambiguity-fixed GPS carrier phase observations
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.
Journal ArticleDOI
Impact of Swarm GPS receiver updates on POD performance
TL;DR: In this article, several modifications have been implemented to the Swarm GPS receivers to improve the robustness against ionospheric scintillation, and the bandwidths of the GPS receiver tracking loops have been widened.
Journal ArticleDOI
Simulations of imaging the event horizon of Sagittarius A* from space
Freek Roelofs,Heino Falcke,Heino Falcke,Heino Falcke,Christiaan D. Brinkerink,Monika Mościbrodzka,Leonid I. Gurvits,Leonid I. Gurvits,Manuel Martin-Neira,Volodymyr Kudriashov,Marc Klein-Wolt,Remo P. J. Tilanus,Remo P. J. Tilanus,Michael Kramer,Luciano Rezzolla +14 more
TL;DR: In this paper, the Event Horizon Imager (EHI) was proposed to image the shadow of the Sagittarius A* (Sgr A*) in the center of our Milky Way, and test basic predictions of the theory of general relativity.
Journal ArticleDOI
Enhanced GPS-based GRACE baseline determination by using a new strategy for ambiguity resolution and relative phase center variation corrections
TL;DR: In this article, the authors proposed an independent baseline determination method based on a new strategy of integer ambiguity resolution and correction of relative receiver antenna phase center variation (PCV) estimation, and implemented the method in the NUDTTK software package.
Journal ArticleDOI
Impact of GPS antenna phase center and code residual variation maps on orbit and baseline determination of GRACE
TL;DR: In this article, an Extended Kalman Filter (EKF) was used to optimize relative spacecraft dynamics and iteratively fix the DD carrier-phase ambiguities, which significantly improved the baseline solution.
References
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BookDOI
Probability theory : the logic of science
TL;DR: In this article, a survey of elementary applications of probability theory can be found, including the following: 1. Plausible reasoning 2. The quantitative rules 3. Elementary sampling theory 4. Elementary hypothesis testing 5. Queer uses for probability theory 6. Elementary parameter estimation 7. The central, Gaussian or normal distribution 8. Sufficiency, ancillarity, and all that 9. Repetitive experiments, probability and frequency 10. Advanced applications: 11. Discrete prior probabilities, the entropy principle 12. Simple applications of decision theory 15.
Book
Global Positioning System: Signals, Measurements, and Performance
TL;DR: This advanced tutorial will describe the GPS signals, the various measurements made by the GPS receivers, and estimate the achievable accuracies, and focus on topics which are more unique to radio navigation or GPS.
Journal ArticleDOI
The gravity recovery and climate experiment: Mission overview and early results
TL;DR: In this paper, the gravity models developed with this data are more than an order of magnitude better at the long and mid wavelengths than previous models and the error estimates indicate a 2-cm accuracy uniformly over the land and ocean regions, a consequence of the highly accurate, global and homogenous nature of the GRACE data.
Journal ArticleDOI
The least-squares ambiguity decorrelation adjustment: a method for fast GPS integer ambiguity estimation
TL;DR: In this article, an ambiguity decorrelation approach is introduced to flatten the typical discontinuity in the GPS-spectrum of ambiguity conditional variances and return new ambiguities that show a dramatic improvement in correlation and precision.