Results 31 to 40 of about 12,904 (207)

Performance Assessment of Non-Integer-Hour Data Blocks in BDS Broadcast Ephemeris

IEEE Access
Due to system anomalies, BeiDou navigation satellite system (BDS) sometimes updates the broadcast ephemeris at non-integral hours. The gross errors contained in the non-integer-hour data blocks of broadcast ephemeris will lead to the signal-in-space (SIS)
Jingjing Wang, Chao Zhou
doaj   +1 more source

Analysis and Assessment of BDS-2 and BDS-3 Broadcast Ephemeris: Accuracy, the Datum of Broadcast Clocks and Its Impact on Single Point Positioning

Remote Sensing, 2020
For the global ordinary users, the broadcast ephemeris plays important roles in positioning, navigation and timing (PNT) services. With the construction of a new generation of the BeiDou navigation satellite system (BDS), the development of BDS has ...
G. Jiao, Shuli Song, Yangyang Liu, Ke Su, N. Cheng, Shengli Wang   +5 more
semanticscholar   +1 more source

Constraint on the Yukawa suppression of the Newtonian potential from the planetary ephemeris INPOP19a [PDF]

, 2020
We use the latest solution of the ephemeris INPOP (19a) in order to improve our previous constraint on the existence of a Yukawa suppression to the Newtonian potential, generically associated to a graviton's mass.
L. Bernus, O. Minazzoli, A. Fienga, M. Gastineau, J. Laskar, P. Deram, A. Di Ruscio   +6 more
semanticscholar   +1 more source

Confirmation of a Non‐Transiting Planet in the Habitable Zone of the Nearby M Dwarf L 98‐59

Astronomische Nachrichten, EarlyView.
ABSTRACT Only 40 exoplanetary systems with five or more planets are currently known. These systems are crucial for our understanding of planet formation and planet‐planet interaction. The M dwarf L 98‐59 has previously been found to show evidence of five planets, three of which are transiting.
Paul I. Schwarz, Stefan Dreizler, René Heller   +2 more
wiley   +1 more source

A long‐term broadcast ephemeris model for extended operation of GNSS satellites

, 2021
GNSS positioning relies on orbit and clock information, which is predicted on the ground and transmitted by the individual satellites as part of their broadcast navigation message.
O. Montenbruck, P. Steigenberger, Moritz Aicher   +2 more
semanticscholar   +1 more source

Digital Twin‐Based Optimization of Service Availability in LEO Mega Constellations Considering Handover Delays in Open RAN

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT As non‐terrestrial networks (NTNs) become integral to future 6G systems, ensuring seamless connectivity and service continuity over low Earth orbit (LEO) satellite constellations is essential. This work investigates the impact of open radio access network (RAN) functional splits on handover performance in NTNs, focusing on minimizing service ...
Siva Satya Sri Ganesh Seeram, Luca Feltrin, Mustafa Ozger, Cicek Cavdar   +3 more
wiley   +1 more source

The fettered and the flea: a new poem by Edmund Waller☆

Renaissance Studies, EarlyView.
Abstract This contribution explores for the first time a 22‐line poem in a British Library manuscript, ‘To a young lady that kept a flea chay'nd in a box’, which can be convincingly ascribed to Edmund Waller. Its most famous relative is Donne's ‘The Flea’, but its ancestry differs.
Stuart Gillespie
wiley   +1 more source

Galileo Broadcast Ephemeris and Clock Errors Analysis: 1 January 2017 to 31 July 2020

Italian National Conference on Sensors, 2020
A preliminary analysis of Galileo F/NAV broadcast Clock and Ephemeris is performed in this paper with 43 months of data. Using consolidated Galileo Receiver Independent Exchange (RINEX) navigation files, automated navigation data monitoring is applied ...
M. T. Alonso, J. Sanz, J. Juan, A. Rovira‐Garcia, G. González‐Casado   +4 more
semanticscholar   +1 more source

THE ASTROMETRIC RESULTS OF OBSERVATIONS OF PERIODICAL COMETS AT KT-50 TELESCOPE IN RI “MAO”

Odessa Astronomical Publications, 2017
The  astrometric  results  of  the observations  of  10  periodical  comets  in  2017  are presented.  The  observations  were  made  with  telescope KT-50  telescope  in  RI  «Mykolaiv  Astronomical Observatory».
A. V. Pomazan, N. V. Maigurova, O. V. Shulga   +2 more
doaj   +1 more source

CNN‐Based Model for 3D CME Parameter Prediction – A Proof of Concept

Journal of Geophysical Research: Machine Learning and Computation, Volume 2, Issue 4, December 2025.
Abstract Accurate 3D reconstruction of coronal mass ejections (CMEs) is essential for understanding their propagation and improving space weather forecasts. In this study, we present a proof‐of‐concept deep learning framework that predicts seven parameters from synthetic multi‐view coronagraph images.
Harshita Gandhi, Huw Morgan, Cory Thomas
wiley   +1 more source