IVS-T2024 (International VLBI Service - Terrestical Reference Frame Observations) 2003 Dec. 02/03 doy 336/337 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. 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. THIS SCHEDULE HAS NO EARLY TAPE START !! ------------------------------------- DSS15 should start at 336-2230 ------------------------------ Crimea takes part in tag-along mode ----------------------------------- Parameter values for experiment T2024 Experiment description: IVS-T2024 Scheduler: mueskens Correlator: BONN Nominal start: 2003-336-17:30:00 Nominal end: 2003-337-17:30:01 Current yyyyddd: 2003336 (2003.92) ( 12976 MJD, TUES 2DEC.) Greenwich sidereal time: 22:14:35.41 (17:30: 0 UT) Sun's RA and DEC: 16h 34.0m -21d 58.0 =========================================================== First observations Observation listing from file t2024.skd for experiment T2024 Source Start DURATIONS name yyddd-hhmmss 15 Ft Hh Ho Kb Oh Sh Sm 1124-186 03336-173000| 137 137 | 0106+013 03336-173000| 414 414 128| 1606+106 03336-173000| 780 780 | CTA26 03336-173854| 60 60 | 0552+398 03336-174126| 60 60 60| End of listing. =========================================================== Last observations Source Start DURATIONS name yyddd-hhmmss 15 Ft Hh Ho Kb Oh Sh Sm 0104-408 03337-170912| 725 725 | OJ287 03337-170938| 66 66 | 1357+769 03337-171328| 226 297 297 | 1749+096 03337-172010| 136 136 | 0059+581 03337-172048| 60 60 60| 0552+398 03337-172450| 60 60 | End of listing. =========================================================== Average number of obs. per baseline per source (normalized by up-time) = 1.2 Min = .0 Max = 27.7 (Baseline Ho-Kb on 4C39.25 ) RMS = 3.2 Total time: 1436 minutes ( 23.9 hours). Key: 15=DSS15 Ft=FORTLEZA Hh=HARTRAO Ho=HOBART26 Kb=KASHIM34 Oh=OHIGGINS Sh=SESHAN25 Sm=CRIMEA 15 Ft Hh Ho Kb Oh Sh Sm Avg % obs. time: 40 45 45 52 45 38 41 7 39 % cal. time: 2 1 1 1 3 0 2 0 1 % slew time: 24 22 23 25 25 6 35 9 21 % idle time: 32 29 29 21 25 53 21 82 37 total # scans: 209 145 113 139 260 63 198 52 147 # scans/hour : 8 6 4 5 10 2 8 2 6.1 Avg scan (sec): 167 270 343 323 150 531 178 125 260 Total GBytes: 275 309 306 354 308 263 278 51 268 # of tapes : .6 2.7 .7 .8 2.4 .6 .6 .4 tape change times (hhmm): 0000 0148 0000 0000 0222 0000 0000 0000 0000 1200 0000 0000 1309 0000 0000 0000 # OF OBSERVATIONS BY BASELINE | 15 Ft Hh Ho Kb Oh Sh Sm StnTotal ---------------------------------------------- 15|209 80 3 23 120 6 66 5 303 Ft| 145 62 0 2 29 0 15 188 Hh| 113 36 9 28 16 31 185 Ho| 139 69 30 50 5 213 Kb| 260 0 182 26 408 Oh| 63 0 2 95 Sh| 198 33 347 Sm| 52 117 Number of 2-station scans: 313 Number of 3-station scans: 143 Number of 4-station scans: 31 Number of 5-station scans: 0 Number of 6-station scans: 0 Number of 7-station scans: 0 Number of 8-station scans: 0 Total # of scans, observations: 487 928 =========================================================== Recording mode Name Code EUR-SX SX Recording mode setup for: DSS15 HARTRAO HOBART26 OHIGGINS SESHAN25 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 CRIMEA 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 Density Passes 15 DSS15 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 Oh OHIGGINS 17400feet (Thin ) 56250. (High) 12 Sh SESHAN25 17400feet (Thin ) 56250. (High) 12 Sm CRIMEA 8700feet (Thick) 33333. (Low ) 12 =========================================================== SNR Targets Minimum SNR by baseline for multi-baseline scans X-band (margin 5) S-band (margin 5) 15 Ft Hh Ho Kb Oh Sh 15 Ft Hh Ho Kb Oh Sh 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 Oh 15 15 15 15 15 Oh 15 15 15 15 15 Sh 25 25 25 25 25 15 Sh 25 25 25 25 25 15 Sm 15 15 15 15 15 15 15 Sm 15 15 15 15 15 15 15