The International DORIS Service July 2003 – December 2005 report

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IDS Report – July 2003 to December 2005 18 Figure 6. DORIS permanent network renovation At the end of 2005, 47 out of 56 stations (in the permanent orbitography network) are considered to have good or excellent stability. 5.3 THIRD GENERATION BEACONS DEPLOYMENT STATUS The deployment of the third generation beacons, which are intended to replace the first and second generation beacons still operating at many DORIS sites, has been interrupted for several months, after a serial failure on the 2 GHz channel was identified. Half of the beacons have been affected by this failure, and all units had to be sent back to the manufacturer in order to be retrofitted. The on-site replacement of defective units could only start in October, as retrofitted beacons became available. The evolution of the proportion of the three beacon types in the permanent network are shown on figure 7. The total number of beacons is lower than 58 because some of the stations whose closure is planned are not taken into account.
5.4 IDS EXPERIMENTS IDS Report – July 2003 to December 2005 19 Figure 7. beacons models in the permanent network The following experiments have been continued or initiated in 2004 (see figure 4): • The second Sorsdal experiment (Glacier movement monitoring in Antarctica) was carried out by Auslig, from November 2003 to January 2004. • A new station was installed at Belgrano II, an Argentine base in Antarctica, following a joint proposal to the IDS by the Alfred Wegener Institute and the Insituto Antárctico Argentino. • The stations at Wettzell (Germany) and Gavdos (Greece) have been down most of the time due to a beacon failure. 5.5 CO-LOCATIONS WITH OTHER IERS TECHNIQUES The number of co-locations with currently operating stations of the other techniques contributing to IERS is as follows. • GPS: 37 sites • SLR: 9 sites • VLBI: 7 sites The following new co-locations were made available in 2004 and 2005: • DORIS-SLR tie at Jiufeng measured in December 2003 • DORIS-GPS tie at Yuzhno-Sakhalinsk measured in August 2004 • DORIS-VLBI tie at St-John’s measured in 2003
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Page 3 and 4: IDS Report - July 2003 to December
Page 5 and 6: 1 INTRODUCTION IDS Report - July 20
Page 11 and 12: 4.2 WEB AND FTP SITES 4.2.1 IDS WEB
Page 13 and 14: 4.3 THE MAIL SYSTEM IDS Report - Ju
Page 17: • Mount Stromlo (Australia) • C
Page 23 and 24: 7 IDS DATA FLOW COORDINATION IDS Re
Page 25 and 26: 7.2 DORIS DATA IDS Report - July 20
Page 29 and 30: 8 ANALYSIS COORDINATION IDS Report
Page 33 and 34: Analysis Center (AC) DORIS IGN-JPL
Page 43 and 44: 8.7 ANALYSES OF STATION STABILITY I
Page 57 and 58: 14 CONCLUSION IDS Report - July 200
Page 61 and 62: 16 REFERENCES IDS Report - July 200

The International DORIS Service July 2003 – December 2005 report

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