Results 71 to 80 of about 20,578 (146)
Combinations of Earth Orientation Measurements: SPACE2012, COMB2012, and POLE2012 [PDF]
Independent Earth orientation measurements taken by the space-geodetic techniques of lunar and satellite laser ranging, very long baseline interferometry, and the Global Positioning System have been combined using a Kalman filter.
Gross, R. S., Ratcliff, J. T.
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Employing combination procedures to short-time EOP prediction
, 2010 A well known problem with Earth Orientation Parameters (EOP) prediction is that a prediction strategy proved to be the best for some testing time span and prediction length may not remain the same for other time intervals.
Alexander Tolstikov +10 more
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Observation model and parameter partials for the JPL VLBI parameter estimation software MASTERFIT-1987 [PDF]
This report is a revision of the document of the same title (1986), dated August 1, which it supersedes. Model changes during 1986 and 1987 included corrections for antenna feed rotation, refraction in modelling antenna axis offsets, and an option to ...
Fanselow, J. L., Sovers, O. J.
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U.S. Naval Observatory VLBI Analysis Center [PDF]
This report summarizes the activities of the VLBI Analysis Center at the United States Naval Observatory for the 2012 calendar year. Over the course of the year, Analysis Center personnel continued analysis and timely submission of IVS-R4 databases for ...
Boboltz, David A. +4 more
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Subnanosecond GPS-based clock synchronization and precision deep-space tracking [PDF]
Interferometric spacecraft tracking is accomplished by the Deep Space Network (DSN) by comparing the arrival time of electromagnetic spacecraft signals at ground antennas separated by baselines on the order of 8000 km. Clock synchronization errors within
Border, J. S. +3 more
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Achieving better than 1 minute accuracy in the Heliocentric and Barycentric Julian Dates
, 2010 As the quality and quantity of astrophysical data continue to improve, the precision with which certain astrophysical events can be timed becomes limited not by the data themselves, but by the manner, standard, and uniformity with which time itself is ...
Eastman, Jason +2 more
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Independent Confirmation of the Pioneer 10 Anomalous Acceleration
, 2002 I perform an independent analysis of radio Doppler tracking data from the Pioneer 10 spacecraft for the time period 1987-1994. All of the tracking data were taken from public archive sources, and the analysis tools were developed independently by myself.
Markwardt, Craig B.
core
Prediction of Earth rotation and polar motion [PDF]
Based on the analysis of the polar motion behavior, the possibility of predicting polar motion up to one year in advance was found. Comparing these predicted polar coordinates with the observed ones (smoothed), the root mean square (rms) of the ...
Zhu, S. Y.
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Analysis Center of Saint Petersburg University [PDF]
This report briefly summarizes the activities of the Analysis Center of Saint Petersburg University during 2012.
Trofimov, Dmitriy, Vityazev, Veniamin
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Combinations of Earth Orientation Measurements: SPACE2011, COMB2011, and POLE2011 [PDF]
Independent Earth orientation measurements taken by the space-geodetic techniques of lunar and satellite laser ranging, very long baseline interferometry, and the Global Positioning System have been combined using a Kalman filter.
Gross, R. S., Ratcliff, J. T.
core +1 more source