Results 21 to 30 of about 753,460 (195)
IEEE Access, 2023 BDS-3 was formally put into service on July 31, 2020, and now along with BDS-2 provides the positioning, navigation and timing services. In this contribution, different techniques of dual-frequency absolute positioning using the fully serviceable BDS-2 ...
Shengnan Liu, Shaolin Zhu, Jian Zhang
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PRECISION EPHEMERIDES FOR GRAVITATIONAL WAVE SEARCHES. II. CYG X-2 [PDF]
The Astrophysical Journal, 2016 ABSTRACT Accreting neutron stars in low-mass X-ray binaries are candidate high-frequency persistent gravitational wave sources. These may be detectable with next-generation interferometers such as Advanced LIGO/VIRGO within this decade. However, the search sensitivity is expected to be limited principally by the uncertainty in the binary
Sammanani S. Premachandra +4 more
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Models for high-precision spacecraft and planetary and lunar ephemerides [PDF]
Proceedings of the International Astronomical Union, 2006 AbstractWe discuss models for high-precision spacecraft and planetary and lunar ephemerides.
E. Myles Standish, James G. Williams
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PRELIMINARY ANALYSES OF BEIDOU SIGNAL-IN-SPACE ANOMALY SINCE 2013 [PDF]
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2016 As BeiDou navigation system has been operational since December 2012. There is an increasing desire to use multiple constellation to improve positioning performance. The signal-in-space (SIS) anomaly caused by the ground control and the space vehicle is
Y. Wu, J. Ren, W. Liu, W. Liu
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Precision of Ephemerides for Space Missions [PDF]
International Astronomical Union Colloquium, 1971 One of the most extensive programs of systematic observations of minor planets currently being conducted is that at the Crimean Astrophysical Observatory. The observed positions, together with the residuals from the predictions in the annual Ephemeris volumes, have been listed in the Minor Planet Circulars for several years now; and inspection of the ...
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The BeiDou Navigation Message [PDF]
, 2013 The article provides an overview of the BeiDou navigation message contents and highlights its specific communalities and differences with respect to other GNSS constellations. Making use of data collected by multi-GNSS monitoring stations of the MGEX and
Steigenberger, Peter +1 more
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Relative Navigation to Non-Cooperative Targets in LEO: Achievable Accuracy from Radar Tracking Measurements [PDF]
, 2013 Any future space debris removal or on-orbit servicing mission faces the problem of the initial relative orbit determination of the servicing satellite to the non-cooperative target.
Letsch, Klemens +5 more
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PRECISION EPHEMERIDES FOR GRAVITATIONAL-WAVE SEARCHES. I. Sco X-1 [PDF]
The Astrophysical Journal, 2013 9 pages, 6 figures, accepted by ...
Galloway, Duncan +5 more
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High precision GPS network with precise ephemerides and earth body tide model
Revista Brasileira de Geofísica, 1997 The permanent GPS network of the International GPS Service for Geodynamics (IGS) provides a global data set of precise GPS measurements, which is invaluable in the development of algorithms and software for very high accuracy GPS positioning. The intensive EPOCH'92 campaign expanded the core network to include densification in many regions of the world.
Monico, J. F. G. +2 more
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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
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