Determination of the earth rotation parameters from optical astrometry observations, 1962.0–1982.0

1986 ◽  
Vol 60 (1) ◽  
pp. 15-28 ◽  
Author(s):  
Zhengxin Li ◽  
Martine Feissel
Keyword(s):  
Earth Rotation ◽  
The Earth ◽  
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 Determination of earth rotation and station coordinates from Lageos data

1988 ◽  
Vol 128 ◽  
pp. 141-146
Author(s):  
A. T. Sinclair ◽  
G. M. Appleby ◽  
J. Y. Xia
Keyword(s):  
Earth Rotation ◽  
Laser Ranging ◽  
Royal Greenwich Observatory ◽  
Absolute Value ◽  
The Earth ◽  
Station Coordinates ◽  
Earth Rotation Parameters ◽  
Rotation Parameters ◽  
Short Arc

A package of computer programs for the analysis of satellite laser ranging data has been written at the Royal Greenwich Observatory. The methods used are described, and the Earth rotation parameters and station coordinates derived from the MERIT Lageos data are given, with comparisons with other determinations. The uncertainty of the absolute value of the z-coordinate of the stations is discussed, and a method of short-arc analysis for determining baselines is described.

scholarly journals Simultaneous determination of the Earth rotation parameters and coordinates of the optical astrometric stations

1988 ◽  
Vol 128 ◽  
pp. 153-158
Author(s):  
Seiji Manabe ◽  
Kiyotaka Tanikawa ◽  
Koichi Yokoyama
Keyword(s):  
Simultaneous Determination ◽  
Earth Rotation ◽  
The Earth ◽  
Earth Rotation Parameters ◽  
Rotation Parameters

The earth rotation parameters and coordinates of optical astrometric stations from 1962. O to 1986. O are estimated simultaneously on the assumption that the system of selected standard stations does not rotate. Longitudes and latitudes of the stations are determined every 2 months. Disagreement of the ERPs with those obtained by the space techniques decreased much compared with the published ERPs of the IPMS. It is expected that the ERPs in the whole period are also improved significantly.

scholarly journals The effect of earthquakes on the ERP during 1977–1985

1988 ◽  
Vol 128 ◽  
pp. 399-404 ◽  
Author(s):  
Richard S. Gross
Keyword(s):  
Earth Rotation ◽  
The Earth ◽  
Time Period ◽  
Earth Rotation Parameters ◽  
Rotation Parameters ◽  
Large Earthquakes

The effect on the Earth Rotation Parameters (ERP) of all the large earthquakes that occurred during 1977–1985 is evaluated. It is found that they cannot have caused the variations observed in the ERP during this time period.

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