IVS-T2026 (International VLBI Service - Terrestical Reference Frame Observations) 2004 Feb. 17/18 doy 048/049 Geodetic Institute of the University of Bonn, Germany Correlator: BONN Purpose ======= The purpose of the IVS-T2 sessions is to monitor the TRF via monthly sessions. All geodetic stations participate in at least three T2 sessions each year. These sessions replace the IRIS-S sessions observed in previous years. 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 eight stations. The eight station differ in some extent between all available IVS geodetic network stations from month to month. This time Matera was scheduled in tag-along, due antenna problems ! Schedule ======== This schedule was generated by SKED using the EUR2-SX band and the EUR2SX-C-2 frequency setup, depending on which station are available for this observation. Variable scan lengths with a minimum 60 sec. and the most recent source flux models are included. SNR goals are 15 to 25 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. The schedule is generated for the estimation of all five (nine) earth orientation parameters, clock offsets and clock rates for all participating stations except the reference station and atmo- sphere parameters for all participating stations. It was optimized for three earth orientation parameters (polar motion, UT1). Other optimization features enabled for this experiment : - the covariance analysis during schedule generation considers the previous 2 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 25 min - using 59 source for improving the sky covorage 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. Please generate the procedures for this session using drudg. =========================================================== Parameter values for experiment T2026 Experiment description: IVS-T2026 Scheduler: mueskens Correlator: BONN Nominal start: 2004-048-17:30:00 Nominal end: 2004-049-17:30:01 Current yyyyddd: 2004048 (2004.13) ( 13053 MJD, TUES 17FEB.) Greenwich sidereal time: 3:18:10.00 (17:30: 0 UT) Sun's RA and DEC: 22h 2.2m -12d 1.9 =========================================================== First observations Observation listing from file /geo/vlbi/schedules/t2026.skd for experiment T2026 Source Start DURATIONS name yyddd-hhmmss 45 Ft Hh Ho Kb Ma Oh Tc 0537-441 04048-173000| 780 780 780 780 780 780| 0955+476 04048-173000| 87 87 | 3C418 04048-173350| 409 409 | 1144-379 04048-174542| 114 501 501 | 0106+013 04048-174659| 525 780 780 780 780| End of listing. =========================================================== Last observations Observation listing from file /geo/vlbi/schedules/t2026.skd for experiment T2026 Source Start DURATIONS name yyddd-hhmmss 45 Ft Hh Ho Kb Ma Oh Tc OQ208 04049-171602| 60 261 261 | End of listing. Observation listing from file /geo/vlbi/schedules/t2026.skd for experiment T2026 Source Start DURATIONS name yyddd-hhmmss 45 Ft Hh Ho Kb Ma Oh Tc 1128+385 04049-170012| 60 60 | 1156+295 04049-170335| 60 91 91 | 0808+019 04049-170657| 106 106 | 1124-186 04049-171028| 61 174 174 | 0528+134 04049-171043| 283 283 | OQ208 04049-171602| 60 261 261 | End of listing. =========================================================== Average number of obs. per baseline per source (normalized by up-time) = 2.7 Min = .0 Max = 38.4 (Baseline Ft-Hh on 1741-038) RMS = 6.2 Total time: 1427 minutes ( 23.8 hours). Key: 45=DSS45 Ft=FORTLEZA Hh=HARTRAO Ho=HOBART26 Kb=KASHIM34 Ma=MATERA Oh=OHIGGINS Tc=TIGO 45 Ft Hh Ho Kb Ma Oh Tc Avg % obs. time: 32 55 46 52 39 23 72 53 46 % cal. time: 3 1 1 2 2 0 1 0 1 % slew time: 30 18 21 30 21 2 7 2 16 % idle time: 33 25 31 14 36 73 18 42 34 total # scans: 258 109 101 216 195 41 93 68 135 # scans/hour : 10 4 4 9 8 1 3 2 5.6 Avg scan (sec): 109 433 390 206 174 493 666 676 393 Total GBytes: 900 1511 1261 1429 1089 647 1982 1473 1286 # of tapes : .5 3.4 .7 .8 2.2 .4 1.1 .9 tape change times (hhmm): 0000 2357 0000 0000 0417 0000 1441 0000 0000 0632 0000 0000 1530 0000 0000 0000 0000 1458 0000 0000 0000 0000 0000 0000 Total number of tapes: 10.0 Total GBytes recorded: 10296.6 # OF OBSERVATIONS BY BASELINE | 45 Ft Hh Ho Kb Ma Oh Tc StnTotal ---------------------------------------------- 45|258 1 29 214 161 1 34 14 454 Ft| 109 59 1 20 30 52 48 211 Hh| 101 27 23 37 41 19 235 Ho| 216 127 3 29 11 412 Kb| 195 9 1 2 343 Ma| 41 22 18 120 Oh| 93 56 235 Tc| 68 168 Number of 2-station scans: 159 Number of 3-station scans: 177 Number of 4-station scans: 34 Number of 5-station scans: 18 Number of 6-station scans: 1 Number of 7-station scans: 0 Number of 8-station scans: 0 Total # of scans, observations: 389 1089 =========================================================== Recording mode Name Code EUR-SX SX Recording mode setup for: DSS45 HARTRAO HOBART26 MATERA OHIGGINS TIGOCONC 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: FORTLEZA KASHIM34 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 45 DSS45 17400feet (Thin ) 56250. (High) 12 Ft FORTLEZA 8700feet (Thick ) 33333. (Low ) 12 Hh HARTRAO 17400feet (Thin ) 56250. (High) 12 Ho HOBART26 17400feet (Thin ) 56250. (High) 12 Kb KASHIM34 8700feet (Thick ) 33333. (Low ) 12 Ma MATERA 17400feet (Thin ) 56250. (High) 12 Oh OHIGGINS 17400feet (Thin ) 56250. (High) 12 Tc TIGOCONC 17400feet (Thin ) 56250. (High) 12 =========================================================== SNR Targets Minimum SNR by baseline for multi-baseline scans X-band (margin 5) S-band (margin 5) 45 Ft Hh Ho Kb Ma Oh 45 Ft Hh Ho Kb Ma Oh Ft 25 Ft 25 Hh 25 25 Hh 25 25 Ho 25 25 25 Ho 25 25 25 Kb 25 25 25 25 Kb 25 25 25 25 Ma 25 25 25 25 25 Ma 25 25 25 25 25 Oh 15 15 15 15 15 15 Oh 15 15 15 15 15 15 Tc 20 20 20 20 20 20 15 Tc 20 20 20 20 20 20 15