Results 11 to 20 of about 1,109,078 (272)
Geo-spatial Information Science, 2022 With the development of the Low Earth Orbit (LEO) communication constellations, it has become a hot area of research to provide additional navigation augmentation services.
Ziqian Wu +5 more
doaj +1 more source
LEO satellite clock analysis and prediction for positioning applications
Geo-spatial Information Science, 2021 The positioning service aided by low Earth orbit (LEO) mega-constellations has become a hot topic in recent years. To achieve precise positioning, accuracy of the LEO clocks is important for single-receiver users. To bridge the gap between the applicable
Kan Wang, Ahmed El-Mowafy
doaj +1 more source
Geo-spatial Information Science, 2022 In recent years, the large Low Earth Orbit (LEO) constellations have become a hot topic due to their great potential to improve the Global Navigation Satellite Systems (GNSS) positioning performance.
Xingxing Li +6 more
doaj +1 more source
Using Technology to Engage Students and Build Learning Communities to Inform Instructional Decisions [PDF]
Athens Journal of Education, 2014 Saint Leo University is a liberal arts university located in southwest Florida. University campus is a residential campus that teaches the traditional aged student.
Carol Todd +4 more
doaj +1 more source
An optimal design of the broadcast ephemeris for LEO navigation augmentation systems
Geo-spatial Information Science, 2022 As the deployment of large Low Earth Orbiters (LEO) communication constellations, navigation from the LEO satellites becomes an emerging opportunity to enhance the existing satellite navigation systems.
Xueli Guo +5 more
doaj +1 more source
A Wide-Field View of Leo II -- A Structural Analysis Using the SDSS [PDF]
, 2007 Using SDSS I data, we have analysed the stellar distribution of the Leo II dwarf spheroidal galaxy (distance of 233 kpc) to search for evidence of tidal deformation.
Coleman, Matthew G. +4 more
core +1 more source
Wave optics‐based LEO‐LEO radio occultation retrieval [PDF]
Radio Science, 2016 AbstractThis paper describes the theory for performing retrieval of radio occultations that use probing frequencies in the XK and KM band. Normally, radio occultations use frequencies in the L band, and GPS satellites are used as the transmitting source, and the occultation signals are received by a GPS receiver on board a Low Earth Orbit (LEO ...
Benzon, Hans-Henrik, Høeg, Per
openaire +4 more sources
Dynamical evidence for a strong tidal interaction between the Milky Way and its satellite, Leo V [PDF]
, 2017 We present a chemodynamical analysis of the Leo~V dwarf galaxy, based on Keck II DEIMOS spectra of 8 member stars. We find a systemic velocity for the system of $\langle v_r\rangle = 170.9^{+ 2.1}_{-1.9}$kms$^{-1}$, and barely resolve a velocity ...
Bonaca, Ana +5 more
core +2 more sources
The elusive old population of the dwarf spheroidal galaxy Leo I [PDF]
, 1999 We report the discovery of a significant old population in the dwarf spheroidal (dSph) galaxy Leo I as a result of a wide-area search with the ESO New Technology Telescope.
Bertelli G. +12 more
core +2 more sources
The Structure of the {\beta} Leonis Debris Disk [PDF]
, 2010 We combine nulling interferometry at 10 {\mu}m using the MMT and Keck Telescopes with spectroscopy, imaging, and photometry from 3 to 100 {\mu}m using Spitzer to study the debris disk around {\beta} Leo over a broad range of spatial scales, corresponding
Akeson +36 more
core +3 more sources