Atmospheric limitations of the accuracy of determination of earth rotation parameters

1986 ◽  
Vol 29 (4) ◽  
pp. 282-284
Author(s):  
L. S. Yunoshev
Keyword(s):  
Earth Rotation ◽  
Earth Rotation Parameters ◽  
Rotation Parameters

scholarly journals Stability of Determining the Earth Rotation Parameters (ERP) with VLBI

1988 ◽  
Vol 129 ◽  
pp. 417-420
Author(s):  
Shifang Luo ◽  
Dawei Zheng
Keyword(s):  
Earth Rotation ◽  
Polar Motion ◽  
Systematic Errors ◽  
Geometric Effect ◽  
The Earth ◽  
Geometric Uncertainty ◽  
Earth Rotation Parameters ◽  
Rotation Parameters ◽  
The Stability

By using the observations of IRIS network, the stability of determinang ERP with VLBI is studied. It is concluded that the uncertainties from initial values of ERP, the errors of other parameters are at the same level as the formal errors in determination of ERP. The geometric effect on determination of ERP is important and appears as systematic errors. Geometric uncertainty on polar motion is greater than that on UT1. and specially much worse for the continenal network. The stability of determining ERP with VLBI can be improved either by increasing new stations at reasonable location in a VLBI network or by increasing new networks.

The International DORIS Service is preparing the future

2020 ◽  
Author(s):  
Pascale Ferrage ◽  
Laurent Soudarin ◽  
Frank Lemoine
Keyword(s):  
Earth Rotation ◽  
International Association ◽  
Tracking System ◽  
Tectonic Plate ◽  
Plate Motions ◽  
The Earth ◽  
Earth Rotation Parameters ◽  
The Future ◽  
Rotation Parameters

<p>The DORIS system recorded its first measurement on February 3rd, 1990, from the SPOT-2 remote sensing satellite. 30 years after, the system is at its best. DORIS has proven greatly valuable for geodesy and geophysics applications: measuring tectonic plate motions, determination of the rotation and the gravity parameters of the Earth, contributing to the international reference system. Technological and methodological improvements have allowed the improvement in the estimates of the positions of the DORIS tracking ground stations, the Earth rotation parameters and other geodetic variables such as the geocenter and the scale of the ITRF.<br>The International DORIS Service (IDS) was created in 2003 under the umbrella of the International Association of Geodesy (IAG) to foster scientific research related to the French DORIS tracking system and to deliver scientific products, mostly related to the International Earth rotation and Reference systems Service (IERS). Since its start, the organization has continuously evolved, leading to additional and improved operational products from an expanded set of DORIS Analysis Centers. IDS is now based on a reinforced structure with two Data Centers, six Analysis Centers, four Associate Analysis Centers, and a Combination Center. Using the experience gained in the preparation of the ITRFs, many improvements were made all along both in data analysis and on technical aspects. After the IDS Retreat held in June 2018, the IDS GB worked on the development of a strategic plan for the IDS. In the coming years, IDS will focus on growing the community, extending the DORIS applications, and improving the technology, the infrastructure and the processing.<br>This presentation addresses the recent achievements made by IDS and how the service is preparing the future.</p>

scholarly journals Is Lunar Ranging a Viable Component in a Next-Generation Earth Rotation Service?

1979 ◽  
Vol 82 ◽  
pp. 257-260 ◽  
Author(s):  
J. Derral Mulholland
Keyword(s):  
Earth Rotation ◽  
Laser Ranging ◽  
Next Generation ◽  
Lunar Laser Ranging ◽  
New Techniques ◽  
Lunar Laser ◽  
Earth Rotation Parameters ◽  
New Space ◽  
Rotation Parameters

Several new “space” techniques have been used for episodic determination of Earth rotation parameters, usually the variation in apparent longitude (UT0) and apparent latitude of an observing station. Earth rotation services require more than episodic determinations; they need near-daily determinations. Since 1975, planning has been underway for a demonstration of the viability of lunar laser ranging for such a usage. The observing campaign named Earth Rotation from Lunar Distances (EROLD) was organized with the proposed activity to cover the years 1977–78. Progress has not been so rapid as hoped, but it remains true that lunar ranging has produced more Earth rotation information than other new techniques.

scholarly journals The NAVOBSY/NRL Program for the Determination of Earth Rotation and Polar Motion

1979 ◽  
Vol 82 ◽  
pp. 211-215
Author(s):  
K. J. Johnston ◽  
J. H. Spencer ◽  
C. H. Mayer ◽  
W. J. Klepczynski ◽  
G. Kaplan ◽  
...  
Keyword(s):  
Earth Rotation ◽  
Polar Motion ◽  
The United States ◽  
Precise Determination ◽  
Naval Research ◽  
Radio Sources ◽  
Naval Observatory ◽  
Earth Rotation Parameters ◽  
Rotation Parameters

The joint program of NAVOBSY/NRL is discussed.The United States Naval Observatory (NAVOBSY) and the Naval Research Laboratory (NRL) are collaborating in a program to apply radio interferometric techniques to the determination of variations in Earth rotation, polar motion, and improved astronomical position reference systems. Investigations of VLBI and connected interferometer techniques and radio sources for astrometic application have been in progress for several years as part of the NRL radio astronomy program, and currently NRL and NAVOBSY are carrying out experimental programs to investigate VLBI time transfer techniques and UT determination using the connected element interferometer of the NRAO in Green Bank. Some previous results of observations using the Green Bank interferometer and proposed plans for operation as a dedicated system over a period of time to evaluate effectiveness for precise determination of Earth rotation parameters are discussed.

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