Results 51 to 60 of about 8,397 (209)
Simulating Authenticated Broadcast in Networks of Bounded Degree [PDF]
arXiv, 2022 The authenticated broadcast is simulated in the bounded-degree networks to provide efficient broadcast primitives for building efficient higher-layer Byzantine protocols. A general abstraction of the relay-based broadcast system is introduced, in which the properties of the relay-based broadcast primitives are generalized.
arxiv
Galileo Single Point Positioning Assessment Including FOC Satellites in Eccentric Orbits
Remote Sensing, 2019 On August 2016, the Milena (E14) and Doresa (E18) satellites started to broadcast ephemeris in navigation message for testing purposes. As the Galileo constellation is not yet complete. It is very important to have two more satellites available since the
Umberto Robustelli, Giovanni Pugliano
doaj +1 more source
LEO Onboard Real-Time Orbit Determination Using GPS/BDS Data with an Optimal Stochastic Model
Remote Sensing, 2020 The advancements of Earth observations, remote sensing, communications and navigation augmentation based on low Earth orbit (LEO) platforms present strong requirements for accurate, real-time and autonomous navigation of LEO satellites.
Xuewen Gong +3 more
doaj +1 more source
Analysis of Factors Affecting Asynchronous RTK Positioning with GNSS Signals
Remote Sensing, 2019 For short baseline real-time kinematic (RTK) positioning, the atmosphere and broadcast ephemeris errors can be usually eliminated in double-differenced (DD) processing for synchronous observations.
Bao Shu +5 more
doaj +1 more source
Remote SensingThis study investigates and verifies the feasibility of the precise point positioning (PPP)-B2b enhanced real-time (RT) precise orbit determination (POD) of low Earth orbit (LEO) satellites.
Yali Shi +5 more
doaj +1 more source
Quantum broadcast communication [PDF]
Chin. Phys., 2007, 16 (7): 1868-1877, 2006 Broadcast encryption allows the sender to securely distribute his/her secret to a dynamically changing group of users over a broadcast channel. In this paper, we just consider a simple broadcast communication task in quantum scenario, which the central party broadcasts his secret to multi-receiver via quantum channel. We present three quantum broadcast
arxiv +1 more source
A Flexible Ephemeris Representation for GNSS and Alternative PNT Signal Sources Using B-Splines
Navigation, 2023 Most global navigation satellite systems (GNSSs) ephemeris representations require straightforward, albeit specialized algorithms to compute the transmitter position at a time of interest.
Mikaela Dobbin, Penina Axelrad
doaj +1 more source
Phoebe's orbit from ground-based and space-based observations [PDF]
, 2013 The ephemeris of Phoebe, the ninth satellite of Saturn, is not very accurate. Previous dynamical models were usually too simplified, the astrometry is heterogeneous and, the Saturn's ephemeris itself is an additionnal source of error. The aim is to improve Phoebe's ephemeris by using a large set of observations, correcting some systematic errors and ...
arxiv +1 more source
Updated Ephemeris and Evidence for a Period Change in the Eclipsing Novalike Variable 1RXS J064434.5+334451 [PDF]
arXiv, 2021 We report seven new eclipse timings for the novalike variable 1RXS J064434.5+334451. An analysis of our data, along with all previously available timings (36 published and 16 unpublished), yields a best-fitting linear ephemeris of BJD$_\mathrm{ecl} = 2,453,403.7611(2) + 0.269~374~43(2)~\mathrm{E}$.
arxiv
Characterization of errors in orbits and clocks of GLONASS satellites [PDF]
, 2021 Satellite navigation systems require of knowing satellite positions with a high level of accuracy. Unlike other GNSS constellations, GLONASS ephemeris can not be directly obtained from broadcast navigation messages at any desired epoch.
Costa Garcia, Joan
core