Intercomparison of the earth rotation parameters determined by two independent VLBI networks

Details Intercomparison of the earth rotation parameters determined by two independent VLBI networks Intercomparison of the earth rotation parameters determined by two independent VLBI networks

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...224..316y&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 224, no. 1-2, Oct. 1989, p. 316-320.

Astronomy and Astrophysics

Astronomy

Celestial Reference Systems, Earth Rotation, Very Long Base Interferometry, Astrometry, Radio Sources (Astronomy), Satellite Observation

Scientific paper

The earth rotation parameters (ERP) are being monitored independently with three very long baseline interferometry (VLBI) networks in the International Earth Rotation Service (IERS) program. The available ERP from different VLBI networks should be consistent and comparable with each other for accurate ERP monitoring. However, systematic offsets have been found between the ERP results of the IRIS-Pacific (IRIS-P) and IRIS-Atlantic (IRIS-A) networks. Since the IRIS-P VLBI network consists of two station groups belonging to different global VLBI projects, the source and station coordinates used in each group are required to be expressed in a unified system for analysis. The data base of the Crustal Dynamics Project (CDP) experiment series 'POLAR', including both CDP and IRIS regular stations, is introduced to obtain the unified station coordinates in the IRIS system. Thereby, the ERP determined by IRIS-P VLBI data come to be in agreement with those of the other regular program IRIS-A. The average offsets between IRIS-P and -A of x-pole, y-pole, UT1, nutation in longitude, and nutation in obliquity are 0.45 marcsec, -1.14 marcsec, -0.035 msec, -0.82 marcsec and 0.18 marcsec each, and are comparable to the formal errors.

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