Rapid Turnaround EOP Measurements by VLBI over the Internet
At present, promptness of the data processing of the international Very Long Baseline Interferometry observations is limited by the time required to ship observation tapes or disks from radio telescope sites to a correlation processing site. It can take more than two weeks to transport all the data tapes to the correlation processing site in typical observation sessions for Earth Orientation Parameter measurements. The e-VLBI technique uses high speed communication networks to transport observation data electrically and it has a possibility to dramatically improve the promptness of the data processing and hence the accuracy of the near real-time prediction of the Earth Orientation Parameters. To realize the e-VLBI observations by using a shared network environment, PC based data acquisition systems and data processing systems have been developed. By using the newly developed system, international e-VLBI sessions were performed twice and a rapid estimation of UTI-UTC in less than one day after the observations was demonstrated by the second session performed on June 27, 2003.
KeywordsVLBI EOP UT1 e-VLBI
Unable to display preview. Download preview PDF.
- Koyama, Y.. R. Ichikawa, T. Otsubo, J. Amagai, K. Sebata, T. Kondo, and N. Kurihara (1999), Recent Achievements in Very Long Baseline Interferometry, J. Comm. Res. Lab., No. 2, Vol. 46, pp. 253–258.Google Scholar
- McCarthy, D. D. (1993), The Use of Crustal Dynamics Project Data to Predict the Orientation of the Earth, in Contributions of Space Geodesy to Geodynamics: Earth Dynamics, by D. E. Smith and D. L. Turcotte (eds.), Geodynamics Series Vol. 24, American Geophysical Union, pp. 71–76.Google Scholar
- Schuh, H., C. Patrick, H. Hase, E. Himwich, K. Kingham, C. Klatt, C. Ma, Z. Malkin, A. Niell, A. Nothnagel, W. Schlüter, K. Takashima, and N. Vandenberg (2002), Final Report, IVS Working Group 2 for Product Specification and Observing Program, in 2001 Annual Report, International VLBI Service for Geodesy and Astrometry, by N. R. Vandenberg and K. D. Baver (eds.), NASA/TP-2002-00817-0, pp. 13–45.Google Scholar
- Whitney, A. R. (2003), The Mark 5 VLBI Data System and e-VLBI Development, in 2002 Annual Report, International VLBI Service for Geodesy and Astrometry, by N. R. Vandenberg and K. D. Baver (eds.), NASA/TP-2003-211619, pp. 22–33.Google Scholar