Results 91 to 100 of about 8,397 (209)
Exactly Optimal Deterministic Radio Broadcasting with Collision Detection [PDF]
arXiv, 2022 We consider the broadcast problem in synchronous radio broadcast models with collision detection. One node of the network is given a message that must be learned by all nodes in the network. We provide a deterministic algorithm that works on the beeping model, which is a restricted version of the radio broadcast model with collision detection.
arxiv
EphemerisSources.jl: Idiomatic Ephemeris Sourcing and Parsing in Julia [PDF]
Journal of Open Source Software, 9(102), 6914 (2024)Students and professionals in astronomy, astrodynamics, astrophysics, and other related fields often download and parse data about objects in our solar system -- ephemeris data -- from two major providers: JPL's publicly-available [Generic SPICE Kernels](https://naif.jpl.nasa.gov/pub/naif/generic_kernels/) and JPL's [Horizons platform](https://ssd.jpl ...
arxiv +1 more source
Remote Sensing, 2019 Abnormal information of satellite orbits inevitably appears in the broadcast ephemeris. Failure to obtain unhealthy information on GPS satellite orbits in precise orbit determination (POD) degrades GPS service performance.
Fei Ye +4 more
doaj +1 more source
Reports on Geodesy and Geoinformatics, 2015 In computational tasks of satellite geodesy there is a need for transformation of coordinates between reference frames ECEF – Earth Centered, Earth Fixed and ECI – Earth Centered, Inertial.
Krzyżek Robert, Skorupa Bogdan
doaj +1 more source
BeiDou Satellite Unhealthy States and the Impact on System Performance
Sensors, 2018 The BeiDou system satellites may be unhealthy due to many reasons, affecting system performance in different ways. Therefore, it is important to analyze the causes and characteristics of the satellites’ unhealthy states. In this study, these states
Caibo Hu +4 more
doaj +1 more source
Broadcast vs Precise GPS Ephemerides: A Historical Perspective [PDF]
, 2002 In most recent years, both high-resolution imagery systems and images were only available to military and national security organizations. Distinctive changes within the commercial image industry allowed space-borne pioneers to provide high-resolution ...
Warren, David L. M.
core +1 more source
Experiments for improved positioning by means of integrated Doppler satellite observations and the NNSS broadcast ephemeris [PDF]
An effort to improve station position recovery using broadcast ephemeris in Doppler data reduction was studied. A comparison of precise and broadcast ephemerides, treating the former as the standard, yielded information about the state disturbance that ...
Arur, M. G.
core +1 more source
Wireless Broadcast with short labelling [PDF]
arXiv, 2019 In this paper, we study the broadcast problem in wireless networks when the broadcast is helped by a labelling scheme. We focus on two variants of broadcast: broadcast without acknowledgment (i.e. the initiator of the broadcast is not notified at the end of broadcast) and broadcast with acknowledgment. Our contribution is threefold.
arxiv
Artificial Broadcasts as Galactic Populations: II. Comparing Individualist and Collective Bounds on Broadcast Populations in Single Galaxies [PDF]
ApJ 966, 183 (2024)The search for extraterrestrial intelligence includes efforts to constrain populations of artificial broadcasts in other galaxies. Previous efforts use individualist methods, searching for single broadcasts with high signal-to-noise ratio. These would be detected as observables with extreme values. This approach is limited to very bright broadcasts and
arxiv +1 more source
Universal superposition codes: capacity regions of compound quantum broadcast channel with confidential messages [PDF]
, 2019 We derive universal codes for transmission of broadcast and confidential messages over classical-quantum-quantum and fully quantum channels. These codes are robust to channel uncertainties considered in the compound model. To construct these codes we generalize random codes for transmission of public messages, to derive a universal superposition coding
arxiv +1 more source