IVS-T2054 (International VLBI Service - Terrestical Reference Frame Observations) 2008 April 01/02 doy 092-093 Institute for Geodesy and Geoinformation (IGG) of the University of Bonn, Germany Correlator ========== see MASTER SCHEDULE 2008 (master08.txt) 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 the last updated SKED version using the EUR-SX band and the 64-16(EU-T2) EURSX-C-4 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 ) 75% 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. CONDITIONING: Conditioning has to be done before recording with all used Mark 5 module(s)/disk package(s). Session Notes for session: t2054 =========================================================== Parameter values for experiment T2054 Experiment description: IVS-T2.054 Scheduler: IGGB/Mueskens Correlator: HAYSTACK Nominal start: 2008-092-17:30:00 Nominal end: 2008-093-17:30:01 Current yyyyddd: 2008092 (2008.25) ( 14558 MJD, TUES 1APR.) Greenwich sidereal time: 6:11: 0.00 (17:30: 0 UT) Sun's RA and DEC: 0h 45.5m 4d 53.0 =========================================================== There are no observations for Wettzell from 18:20 U.T. to 19:40 U.T. Wettzell will participate in the intensive session during this 1.5 hour period. =========================================================== First observations Observation listing from file t2054.skd for experiment T2054 Source Start DURATIONS name yyddd-hhmmss Sm 13 Ft Kb Mc Nt Sh Sv Tc Ur Wz 0552+398 08092-173000| 211 40 359 40 40 40 359 40| 1958-179 08092-173351| 62 159 159 | 1357+769 08092-173359| 40 40 44 40 44| =========================================================== Last observations 0537-441 08093-170950| 331 331 | 3C371 08093-171219| 381 80 113 144 237 290 158 381 314| 1958-179 08093-171626| 61 61 | 1739+522 08093-171701| 40 40 40 | 1954-388 08093-171805| 281 281 | 1424-418 08093-172358| 40 40 | =========================================================== Average number of obs. per baseline per source (normalized by up-time) = 5.3 Min = 0.0 Max = 75.8 (Baseline 13-Ur on 1351-018) RMS = 8.2 Total time: 1435 minutes ( 23.9 hours). Key: Sm=CRIMEA 13=DSS13 Ft=FORTLEZA Kb=KASHIM34 Mc=MEDICINA Nt=NOTO Sh=SESHAN25 Sv=SVETLOE Tc=TIGO Ur=URUMQI Wz=WETTZELL Sm 13 Ft Kb Mc Nt Sh Sv Tc Ur Wz Avg % obs. time: 33 38 59 26 25 37 35 24 44 46 38 37 % cal. time: 1 2 1 2 2 1 2 2 1 1 1 1 % slew time: 27 26 23 34 33 33 26 42 4 24 7 26 % idle time: 38 33 17 37 40 27 36 31 50 27 53 36 total # scans: 180 264 151 284 274 245 268 274 138 222 227 229 # scans/hour : 7.5 11.0 6.3 11.9 11.5 10.2 11.2 11.5 5.8 9.3 9.5 9.6 Avg scan (sec): 157 125 334 80 77 130 113 77 275 180 143 153 Total GBytes: 460 620 922 436 407 594 569 403 695 738 605 586 Total GB(M5): 467 551 819 388 362 528 506 359 618 656 538 527 # OF OBSERVATIONS BY BASELINE | Sm 13 Ft Kb Mc Nt Sh Sv Tc Ur Wz StnTotal ---------------------------------------------------------- Sm|180 27 35 92 138 128 99 146 7 115 121 908 13| 264 93 81 88 68 54 82 121 54 71 739 Ft| 151 12 88 90 14 64 53 39 77 565 Kb| 284 109 98 233 142 7 155 104 1033 Mc| 274 220 103 222 27 121 206 1322 Nt| 245 97 194 24 112 195 1226 Sh| 268 128 0 178 99 1005 Sv| 274 15 143 193 1329 Tc| 138 0 20 274 Ur| 222 114 1031 Wz| 227 1200 Total # of scans, observations: 614 5316 =========================================================== Recording mode Name Code EUR2-SX SX Recording mode setup for: CRIMEA Mode Tot.Rate Tot.BandW #chan #bits Barrel C 112.000 Mbits 56.000 MHz 14 1 NONE Chan.BW #Subpasses Tracks(*fan) Tot.tracks Speed 4.00 MHz 2 14(*0) 28 270.00 X-band spanned bw= 360.0 MHz rms spanned bw= 140.2 MHz S-band spanned bw= 80.0 MHz rms spanned bw= 30.2 MHz Effective number of channels recorded per sub-pass X S Total 8.000 6.000 14.000 Recording mode setup for: DSS13 MEDICINA NOTO SVETLOE TIGOCONC URUMQI WETTZELL Mode Tot.Rate Tot.BandW #chan #bits Barrel Mk341:2 128.000 Mbits 64.000 MHz 14 1 16 Chan.BW #Subpasses Tracks(*fan) Tot.tracks Speed 4.00 MHz 1 16(*2) 32 80.00 X-band spanned bw= 360.0 MHz rms spanned bw= 140.2 MHz S-band spanned bw= 80.0 MHz rms spanned bw= 30.2 MHz Effective number of channels recorded per sub-pass X S Total 10.000 6.000 16.000 Recording mode setup for: FORTLEZA KASHIM34 Mode Tot.Rate Tot.BandW #chan #bits Barrel Mk341:2 128.000 Mbits 64.000 MHz 14 1 NONE Chan.BW #Subpasses Tracks(*fan) Tot.tracks Speed 4.00 MHz 1 16(*2) 32 135.00 X-band spanned bw= 360.0 MHz rms spanned bw= 140.2 MHz S-band spanned bw= 80.0 MHz rms spanned bw= 30.2 MHz Effective number of channels recorded per sub-pass X S Total 10.000 6.000 16.000 Recording mode setup for: SESHAN25 Mode Tot.Rate Tot.BandW #chan #bits Barrel Mk341:2 128.000 Mbits 64.000 MHz 14 1 NONE Chan.BW #Subpasses Tracks(*fan) Tot.tracks Speed 4.00 MHz 1 16(*2) 32 80.00 X-band spanned bw= 360.0 MHz rms spanned bw= 140.2 MHz S-band spanned bw= 80.0 MHz rms spanned bw= 30.2 MHz Effective number of channels recorded per sub-pass X S Total 10.000 6.000 16.000 ===========================================================