IVS-T2032 (International VLBI Service - Terrestical Reference Frame Observations) 2004 Aug 17/18 doy 230/231 Geodetic Institute of the University of Bonn, Germany Purpose ======= General the purpose of the IVS-T2 sessions is to monitor the TRF via monthly sessions. Since April 2004 the purpose of the remaining IVS-T2 sessions has been changed by the IVS OPC (Observing Program Committee). The new plan uses larger networks for each T2 session, say 16 to 20 stations, but have fewer T2 sessions during the year. The larger network should provide a stronger solution and better TRF results, even if there are fewer sessions each year. The TRF determine from single session solutions or from a global solution is very important IVS product because this is an essential part for creating the ITRF by corresponding IERS Product Center. A particular strength of VLBI is its contribution to the scale of the ITRF. Usually the TRF is computed from the 24h sessions that are dedicated to observing the EOP. Network ======= The standard configuration of the monthly observed IVS-T2 experiments consists of sixteen and more stations. All stations differ in some extent between all available IVS geodetic network stations from experiment to experiment. Schedule ======== This schedule was generated by SKED ((NRV/JMG 2004May05) using the EUR-SX band and the EURSX-C-2 frequency setup, depending on which station are available for this observation. Variable scan lengths with a minimum 40 sec. and the most recent source flux models are included. SNR goals are 20 at X-band and S-band depent on different baselines and stations. The predicted SNRs used include a 30 ps noise contribution added in quadrature, which is a typical magnitude for the reweight constants applied in SOLVE solutions. Some important optimization features enabled for this experiment : - the covariance analysis during schedule generation considers the previous 1 hours of observations, - minor SKED optimization parameters . maximum number of observations, . minimum time, were optimized over the best ( in a covariance sense ) 70% of the possible observations, this produces a somewhat more even sky distribution, - observations were weighted by their expected SNRs, - 30 ps noise contribution added, - mimimum time between observations of the same radio source was set to 20 min - using 63 source for improving the sky covorage (and some new astrometric sources / see $ASTROMETRIC ) Procedures ========== NO PREPASS TIME: There is no time allowed in the schedule for prepassing tapes. Therefore all tapes needed for this experiment must be pre-checked before the start of this experiment. =========================================================== Parameter values for experiment T2032 Experiment description: IVS-T2.032 Scheduler: UBonn/Mueskens Nominal start: 2004-230-17:30:00 Nominal end: 2004-231-17:30:01 Current yyyyddd: 2004230 (2004.63) ( 13235 MJD, TUES 17AUG.) Greenwich sidereal time: 15:15:43.00 (17:30: 0 UT) Sun's RA and DEC: 9h 49.6m 13d 8.6 =========================================================== First observations Observation listing from file t2032.skd for experiment T2032 Source Start DURATIONS name yyddd-hhmmss Ap Yk 65 Gc Mc Ny Sv Tc Ur Wf Wz Ft Gg 0059+581 04230-173000| 43 760 62 144 204 254 188 760 341 421 | 4C39.25 04230-173447| 175 175| 1611+343 04230-173804| 45 40 91 219 109 266 266 | 1726+455 04230-173959| 40 40 | 1749+096 04230-174059| 40 40 40 | End of listing. =========================================================== Last observations name yyddd-hhmmss Ap Yk 65 Gc Mc Ny Sv Tc Ur Wf Wz Ft Gg 1606+106 04231-165648| 40 40 40 40 | 0642+449 04231-170228| 179 760 427 450 760 430 760 760 | 0743+259 04231-170739| 366 366 | 4C39.25 04231-171127| 46 170 134 134 170| 2234+282 04231-171653| 96 93 96 | 1622-253 04231-172211| 40 40 40 | End of listing. =========================================================== Average number of obs. per baseline per source (normalized by up-time) = 2.4 Min = .0 Max = 46.5 (Baseline Ur-Ft on 1622-297) RMS = 4.7 Total time: 1433 minutes ( 23.9 hours). Key: Ap=ALGOPARK Yk=ARIES_9M 65=DSS65 Gc=GILCREEK Mc=MEDICINA Ny=NYALES20 Sv=SVETLOE Tc=TIGO Ur=URUMQI Wf=WESTFORD Wz=WETTZELL Ft=FORTLEZA Gg=ORION_5M Ap Yk 65 Gc Mc Ny Sv Tc Ur Wf Wz Ft Gg Avg % obs. time: 26 54 22 49 41 52 35 33 44 56 57 53 11 41 % cal. time: 2 1 2 2 2 1 2 0 1 1 2 1 0 1 % slew time: 55 10 51 13 24 10 31 2 13 7 6 18 1 19 % idle time: 15 33 23 35 31 35 30 63 40 33 34 26 86 37 total # scans: 207 127 225 185 228 169 212 52 125 149 175 107 34 153 # scans/hour : 8 5 9 7 9 7 8 2 5 6 7 4 1 6.4 Avg scan (sec): 109 366 85 229 157 268 142 555 309 328 282 433 292 273 Total GBytes: 179 366 151 334 282 357 237 227 304 385 389 365 78 282 Total GB(M5): 181 372 154 339 287 363 241 230 309 391 395 371 79 286 # of tapes : .4 3.0 .3 .8 .6 .8 2.0 .5 .7 .9 .9 3.1 .2 tape change times (hhmm): 0000 0202 0000 0000 0000 0000 0515 0000 0000 0000 0000 0118 0000 0000 1005 0000 0000 0000 0000 0000 0000 0000 0000 0000 0855 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 1644 0000 Total number of tapes: 14.1 Total GBytes (M5) recorded: 3717.8 # OF OBSERVATIONS BY BASELINE | Ap Yk 65 Gc Mc Ny Sv Tc Ur Wf Wz Ft Gg StnTotal ------------------------------------------------------------------ Ap|207 74 91 92 85 79 87 9 31 105 69 30 27 779 Yk| 127 36 95 39 55 47 0 24 54 39 8 4 475 65| 225 64 175 90 127 9 47 59 118 44 6 866 Gc| 185 68 100 90 0 67 68 62 9 6 721 Mc| 228 93 138 7 71 59 140 32 6 913 Ny| 169 136 0 77 67 103 7 5 812 Sv| 212 2 87 58 128 14 5 919 Tc| 52 0 17 3 43 0 90 Ur| 125 26 66 3 0 499 Wf| 149 57 36 11 617 Wz| 175 21 5 811 Ft| 107 6 253 Gg| 34 81 Number of 2-station scans: 233 Number of 3-station scans: 97 Number of 4-station scans: 69 Number of 5-station scans: 42 Number of 6-station scans: 35 Number of 7-station scans: 20 Number of 8-station scans: 20 Number of 9-station scans: 10 Number of 10-station scans: 13 Number of 11-station scans: 2 Number of 12-station scans: 0 Number of 13-station scans: 0 Total # of scans, observations: 541 3918 =========================================================== Recording mode Name Code EUR-SX SX Recording mode setup for: ALGOPARK DSS65 GILCREEK MEDICINA NYALES20 GGAO7108 TIGOCONC URUMQI WESTFORD WETTZELL Mode Tot.Rate Tot.BandW #chan #bits Barrel C 56.000 Mbits 28.000 MHz 14 1 NONE Chan.BW #Subpasses Tracks(*fan) Tot.tracks Speed 2.00 MHz 2 14(*0) 28 80.00 X-band spanned bw= 360.0 MHz rms spanned bw= 140.2 MHz S-band spanned bw= 85.0 MHz rms spanned bw= 33.0 MHz Effective number of channels recorded per sub-pass X S Total 8.000 6.000 14.000 Recording mode setup for: YLOW7296 FORTLEZA SVETLOE Mode Tot.Rate Tot.BandW #chan #bits Barrel C 56.000 Mbits 28.000 MHz 14 1 NONE Chan.BW #Subpasses Tracks(*fan) Tot.tracks Speed 2.00 MHz 2 14(*0) 28 135.00 X-band spanned bw= 360.0 MHz rms spanned bw= 140.2 MHz S-band spanned bw= 85.0 MHz rms spanned bw= 33.0 MHz Effective number of channels recorded per sub-pass X S Total 8.000 6.000 14.000 =========================================================== Tape types ID Station Tape length Speed ID Station Tape length Speed Ap ALGOPARK 17400feet (Thin ) 56250. (High) 12 Yk YLOW7296 8700feet (Thick ) 33333. (Low ) 12 65 DSS65 17400feet (Thin ) 56250. (High) 12 Ft FORTLEZA 8700feet (Thick ) 33333. (Low ) 12 Gc GILCREEK 17400feet (Thin ) 56250. (High) 12 Mc MEDICINA 17400feet (Thin ) 56250. (High) 12 Ny NYALES20 17400feet (Thin ) 56250. (High) 12 Gg GGAO7108 17400feet (Thin ) 56250. (High) 12 Sv SVETLOE 8700feet (Thick ) 33333. (Low ) 12 Tc TIGOCONC 17400feet (Thin ) 56250. (High) 12 Ur URUMQI 17400feet (Thin ) 56250. (High) 12 Wf WESTFORD 17400feet (Thin ) 56250. (High) 12 Wz WETTZELL 17400feet (Thin ) 56250. (High) 12 =========================================================== SNR Targets Minimum SNR by baseline for multi-baseline scans X-band (margin 5) S-band (margin 3) Ap Yk 65 Gc Mc Ny Sv Tc Ur Wf Wz Ft Ap Yk 65 Gc Mc Ny Sv Tc Ur Wf Wz Ft Yk 20 Yk 20 65 20 20 65 20 20 Gc 20 20 20 Gc 20 20 20 Mc 20 20 20 20 Mc 20 20 20 20 Ny 20 20 20 20 20 Ny 20 20 20 20 20 Sv 20 20 20 20 20 20 Sv 20 20 20 20 20 20 Tc 18 18 18 18 18 18 18 Tc 18 18 18 18 18 18 18 Ur 20 20 20 20 20 20 20 18 Ur 20 20 20 20 20 20 20 18 Wf 20 20 20 20 20 20 20 18 20 Wf 20 20 20 20 20 20 20 18 20 Wz 20 20 20 20 20 20 20 18 20 20 Wz 20 20 20 20 20 20 20 18 20 20 Ft 20 20 20 20 20 20 20 18 20 20 20 Ft 20 20 20 20 20 20 20 18 20 20 20 Gg 18 18 18 18 18 18 18 18 18 18 18 18 Gg 18 18 18 18 18 18 18 18 18 18 18 18