Results 91 to 100 of about 135,353 (193)
Development of a pulsar-based timescale [PDF]
, 2012 Using observations of pulsars from the Parkes Pulsar Timing Array (PPTA) project we develop the first pulsar-based timescale that has a precision comparable to the uncertainties in international atomic timescales.
Bailes, M. +23 more
core +4 more sources
Chinese Astronomy and Astrophysics, 2009 Abstract The satellite-borne GPS receivers dedicated to precise orbit determination are now being carried by more and more low earth orbit (LEO) satellites and the satellite-borne GPS has become one of the main means for the precise orbit determination of low earth orbit satellites.
Dong-ju, P., Bin, W.
openaire +4 more sources
Engineering Reports, Volume 7, Issue 1, January 2025.ABSTRACT Due to the long transmission distance of the constellation network represented by the low‐orbit satellite system, the satellite‐to‐ground link is subject to large path loss and limited communication performance. This paper uses multi‐satellite and multi‐beam joint transmission technology to form a virtual multiplex network with ground multi ...
Yuyang Liu, Tong Shi, Hua Wang
wiley +1 more source
A New Asynchronous RTK Method to Mitigate Base Station Observation Outages
Sensors, 2019 Real-time kinematic (RTK) positioning is a satellite navigation technique that is widely used to enhance the precision of position data obtained from global navigation satellite systems (GNSS).
Yuan Du +4 more
doaj +1 more source
Stability Tests for the Network of Permanent GNSS Stations of the Republic of Srpska
AGG+, 2020 The network of permanent GNSS stations of the Republic of Srpska is located in a fairly seismic area and belongs to different sides of regional faults.
Tanja Fržović +2 more
doaj +1 more source
Visibility Analysis of Domestic Satellites on Proposed Ground Sites for Optical Surveillance [PDF]
Journal of Astronomy and Space Sciences, 2011 The objectives of this study are to analyze the satellite visibility at the randomly established ground sites, to determine the five optimal ground sites to perform the optical surveillance and tracking of domestic satellites, and to verify the ...
Jung Hyun Jo1 +7 more
doaj +1 more source
A new ephemeris and an orbital solution of ε Aurigae [PDF]
2010IBVS.5937....1C, 2010 We collected rich series of RV measurements covering last 110 years and photometric observations from the past 6 primary eclipses, complemented them by our new observations and derived a new precise ephemeris and an orbital solution of epsilon Aur.
arxiv
The Transit Light Curve Project. X. A Christmas Transit of HD 17156b [PDF]
, 2008 Photometry is presented of the Dec. 25, 2007 transit of HD 17156b, which has the longest orbital period and highest orbital eccentricity of all the known transiting exoplanets. New measurements of the stellar radial velocity are also presented.
Avi Shporer +39 more
core +2 more sources
A Durable Electron Density Profile Near the Inner Edge of the Io Torus
Journal of Geophysical Research: Space Physics, Volume 130, Issue 1, January 2025.Abstract The Juno Waves instrument can be used to accurately determine the electron density inside Io's orbit, the inner Io torus. These observations have revealed a local peak in the electron density just inside M = 5 and at centrifugal latitudes above about 10° ${}^{\circ}$ that is likely the ’cold torus' as identified in Earth‐based observations of ...
W. S. Kurth +10 more
wiley +1 more source
Astrometry of Cassini with the VLBA to Improve the Saturn Ephemeris [PDF]
, 2014 Planetary ephemerides have been developed and improved over centuries. They are a fundamental tool for understanding solar system dynamics, and essential for planetary and small body mass determinations, occultation predictions, high-precision tests of general relativity, pulsar timing, and interplanetary spacecraft navigation.
arxiv +1 more source