Results 271 to 280 of about 41,139 (300)

Polarised moonlight guides nocturnal bull ants home. [PDF]

Elife
Freas CA, Narenda A, Murray T, Cheng K.
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Ephemeris Error Modeling in Opportunistic LEO Satellite Tracking with Pseudorange and Doppler Measurements

Proceedings of the 36th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2023), 2023
A framework for tracking the ephemerides of low Earth orbit (LEO) satellites is presented. This framework considers a known receiver that tracks the position and velocity states of LEO satellites using pseudorange or Doppler measurements extracted ...
S. Hayek, Joe Saroufim, Z. M. Kassas
semanticscholar   +1 more source

Satellite Ephemeris Broadcasting Architecture for 5G Integrated LEO Satellite Internet

International Conference on Speech Technology and Human-Computer Dialogue, 2022
This paper proposes a satellite ephemeris broadcasting architecture for 5G integrated low earth orbit (LEO) Satellite Internet based on two-line element (TLE) ephemeris. By periodically broadcasting the TLE ephemeris, which can be used to assist the user
Jianwei Li, Dongdong Wang, Lizhe Liu, Bin Wang, Chenhua Sun   +4 more
semanticscholar   +1 more source

Eclipse-Conscious Transfer to Lunar Gateway Using Ephemeris-Driven Terminal Coast Arcs

Journal of Guidance Control and Dynamics, 2021
A novel methodology is proposed for designing low-thrust trajectories to quasi-periodic, near-rectilinear Halo orbits that leverages ephemeris-driven, “invariant manifold analogs” as long-duration ...
Sandeep K. Singh, J. Junkins, B. Anderson, E. Taheri   +3 more
semanticscholar   +1 more source

Ephemeris Closed-Loop Tracking of LEO Satellites with Pseudorange and Doppler Measurements

Proceedings of the 34th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2021), 2021
A framework for refining the ephemerides of low Earth orbit (LEO) space vehicles (SVs) is presented. This framework is based on a known receiver that tracks the LEO SVs using pseudorange and Doppler measurements extracted from the LEO SVs’ signals.
Nadim Khairallah, Z. Kassas
semanticscholar   +1 more source

Ephemeris Tracking and Error Propagation Analysis of LEO Satellites With Application to Opportunistic Navigation

IEEE Transactions on Aerospace and Electronic Systems
A comprehensive study is performed for low Earth orbit (LEO) space vehicles (SVs) tracking by a receiver opportunistically extracting navigation observables from their downlink radio frequency signals.
Nadim Khairallah, Z. M. Kassas
semanticscholar   +1 more source

Single Satellite Emitter Geolocation in the Presence of Oscillator and Ephemeris Errors

IEEE Aerospace Conference, 2020
This paper addresses high-accuracy geolocation of a ground-level, uncooperative RF emitter using a single low earth orbit (LEO) satellite. It is meant to be a real-time, single-pass solution that requires only a few seconds of Doppler and Doppler Rate ...
P. Ellis, F. Dowla
semanticscholar   +1 more source

Ephemeris Error Correction for Tracking Non-Cooperative LEO Satellites with Pseudorange Measurements

IEEE Aerospace Conference
Correcting the ephemeris of a poorly known "non-cooperative" low Earth orbit (LEO) satellite, by utilizing pseudorange measurements by a ground-based receiver is considered.
S. Hayek, Joe Saroufim, Z. M. Kassas
semanticscholar   +1 more source

Ephemeris of Pluto

Icarus, 1980
Abstract The limited period of observational data and the long orbital period have limited the accuracy of the Pluto ephemerides. This condition will continue for some time. Ephemerides of Pluto are compared with the observational data.
K.F. Pulkkiner, T.C. Van Flandern, P. K. Seidelmann, E. J. Santoro, G. H. Kaplan   +4 more
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