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Pixel 5 Versus Pixel 9 Pro XL-Are Android Devices Evolving Towards Better GNSS Performance? [PDF]

Sensors (Basel)
Tomaštík J, Hernández Olcina J, Saloň Š, Tunák D.   +3 more
europepmc   +1 more source

Precision of the ephemerides of outer planetary satellites

Planetary and Space Science, 2010
Abstract Ephemerides of planetary satellites are needed to address many problems. These ephemerides are used for subsequent observations. A comparison of the available ephemerides with new observations allows the accuracy of the former to be assessed. However, the precision of the ephemerides must be known a priori when solving the tasks.
Nikolay Emelyanov
exaly   +5 more sources

Precise On-Board Navigation of LEO Satellites with GNSS Broadcast Ephemerides

ION GNSS+, The International Technical Meeting of the Satellite Division of The Institute of Navigation, 2020
The availability of orbit information with high precision and low latency is a key requirement for many Earthobservation missions, predominantly in the field of radio occultation. Traditionally, precise orbit determination solutions of low-Earth orbit (LEO) satellites are done offline on the ground after dwonloading GNSS measurements and required ...
Hauschild, André, Montenbruck, Oliver
openaire   +3 more sources

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IGS Combination of Precise GPS Satellite Ephemerides and Clocks

International Association of Geodesy Symposia, 1996
Since January 1, 1994, the Geodetic Survey Division (GSD) of Natural Resources Canada (formerly Energy Mines and Resources, EMR) has been combining and comparing the GPS satellite ephemerides and clock corrections produced by the seven Analysis Centres contributing to the International GPS Service for Geodynamics (IGS).
Y. Mireault, J. Kouba, F. Lahaye
exaly   +2 more sources

Broadcast versus precise ephemerides: a multi-GNSS perspective

GPS Solutions, 2014
A consistent analysis of signal-in-space ranging errors (SISREs) is presented for all current satellite navigation systems, considering both global average values and worst-user-location statistics. The analysis is based on 1 year of broadcast ephemeris messages of the Global Positioning System (GPS), GLONASS, Galileo, BeiDou and QZSS collected with a ...
André Hauschild, Peter Steigenberger, Oliver Montenbruck   +2 more
exaly   +3 more sources

Effect of broadcast and precise ephemerides on estimates of the frequency stability of GPS Navstar clocks

International Journal of Satellite Communications and Networking, 1994
AbstractFrequency stability analysis of on‐orbit Navstar clocks is performed by the Naval Research Laboratory using both the broadcast and the precise post‐processed ephemerides. The phase offset between the Navstar clock and the reference clock is computed from pseudorange measurements obtained by dual‐frequency GPS receivers at the five GPS monitor ...
Thomas B. McCaskill, Wilson G. Reid, James A. Buisson, Hugh E. Warren   +3 more
exaly   +2 more sources

First use of IGEX precise ephemerides for intercontinental GLONASS P-code time transfer

Journal of Geodesy, 2001
Until recently, the Global Positioning System (GPS) was the only operational means of distributing time to an arbitrary number of users and of synchronizing clocks over large distances with a high degree of precision and accuracy. Over the last few years it has been shown that similar performance can be achieved using the Russian Global Navigation ...
W Lewandowski, J Nawrocki
exaly   +2 more sources

The dynamics of global positioning system orbits and the determination of precise ephemerides

Journal of Geophysical Research, 1989
Analytical orbit perturbation theory suggests that the errors in the ephemerides of the Global Positioning System (GPS) satellites should be mostly resonant effects that can be corrected by adjusting a few parameters in a simple empirical acceleration formula, despite the complexity of their causes (mismodeling of gravity, radiation pressure, etc.), at
exaly   +2 more sources

Broadcast vs. precise GPS ephemerides: a historical perspective

GPS Solutions, 2003
John F Raquet
exaly   +2 more sources

The quality of precise glonass ephemerides

Advances in Space Research, 2002
Abstract To set up a global observation network, and to get experience in modelling GLONASS satellite orbits have been identified as key issues of the International GLONASS Experiment (IGEX), proposed in the late 1997. Thus in October 1998 the official IGEX field campaign was launched as a common effort of more than 60 institutions contributing to ...
R. Weber, E. Fragner
openaire   +1 more source