12 papers
Progressive Replacement Sequence Planning for Laser-Enhanced BeiDou Navigation Constellations
Huan Yan, Juan A. Fraire, Ziqi Yang +5
The early satellites of the third-generation BeiDou Navigation Satellite System (BDS-3) are approaching the end of their design lifetime, making progressive constellation replaceme…
Dirty Bits in Low-Earth Orbit: The Carbon Footprint of Launching Computers
Robin Ohs, Gregory F. Stock, Andreas Schmidt +2
Low-Earth Orbit (LEO) satellites are increasingly proposed for communication and in-orbit computing, achieving low-latency global services. However, their sustainability remains la…
Contact Plan Design for Cross-Linked GNSSs: An ILP Approach for Extended Applications
Huan Yan, Juan A. Fraire, Ziqi Yang +10
Global Navigation Satellite Systems (GNSS) employ inter-satellite links (ISLs) to reduce dependency on ground stations, enabling precise ranging and communication across satellites…
Contact Plan Design For Optical Interplanetary Communications
Jason Gerard, Juan A. Fraire, Sandra Cespedes
Space exploration missions generate rapidly increasing volumes of scientific telemetry that far exceed the capacity of today's manually scheduled, RF-based deep-space infrastructur…
POMDP-Based Routing for DTNs with Partial Knowledge and Dependent Failures
Gregory F. Stock, Alexander Haberl, Juan A. Fraire +1
Routing in Delay-Tolerant Networks (DTNs) is inherently challenging due to sparse connectivity, long delays, and frequent disruptions. While Markov Decision Processes (MDPs) have b…
Modeling Pointing, Acquisition, and Tracking Delays in Free-Space Optical Satellite Networks
Jason Gerard, Juan A. Fraire, Sandra Céspedes
Free-space optical inter-satellite links (OISLs) enable high-capacity space communications but require precise Pointing, Acquisition, and Tracking (PAT) between links. Current sche…