IVS-T2023 (International VLBI Service - Terrestical reference frame observations) 2003 Nov. 18/19 doy 322/323 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 !! ------------------------------------- Parameter values for experiment T2023 Experiment description: IVS-T2023 Scheduler: Mueskens Correlator: BONN Nominal start: 2003-322-17:30:00 Nominal end: 2003-323-17:30:01 Current yyyyddd: 2003322 (2003.88) ( 12962 MJD, TUES 18NOV.) Greenwich sidereal time: 21:19:23.63 (17:30: 0 UT) Sun's RA and DEC: 15h 34.5m -19d 14.7 =========================================================== First observations Observation listing from file t2023.skd for experiment T2023 Source Start DURATIONS name yyddd-hhmmss 15 Ft Hh Ho Kb Oh Sh Sv 0454-234 03322-173000| 335 166 184 335 | 0552+398 03322-173000| 60 60 60 60| 1921-293 03322-173000| 63 63 | 0229+131 03322-173323| 60 60| 1741-038 03322-173456| 366 396 188 396 | End of listing. =========================================================== Last observations Source Start DURATIONS name yyddd-hhmmss 15 Ft Hh Ho Kb Oh Sh Sv 1308+326 03323-170628| 98 98 | 1921-293 03323-170852| 71 71 | 0727-115 03323-171045| 79 60 79 | 2145+067 03323-171248| 373 373 60| 0537-441 03323-171404| 60 60 60 | 1741-038 03323-172335| 361 394 190 394 | End of listing. =========================================================== Average number of obs. per baseline per source (normalized by up-time) = 1.4 Min = .0 Max = 22.3 (Baseline Kb-Sh on 0537-441) RMS = 3.6 Total time: 1439 minutes ( 24.0 hours). Key: 15=DSS15 Ft=FORTLEZA Hh=HARTRAO Ho=HOBART26 Kb=KASHIM34 Oh=OHIGGINS Sh=SESHAN25 Sv=SVETLOE 15 Ft Hh Ho Kb Oh Sh Sv Avg % obs. time: 48 36 43 56 35 34 31 38 40 % cal. time: 2 1 1 1 2 0 1 2 1 % slew time: 30 19 24 25 29 6 30 30 24 % idle time: 18 42 31 16 32 57 36 28 32 total # scans: 240 127 117 145 245 59 152 214 162 # scans/hour : 10 5 4 6 10 2 6 8 6.8 Avg scan (sec): 173 249 318 336 123 510 180 155 255 Total GBytes: 327 249 293 384 238 237 216 261 275 # of tapes : .7 2.2 .7 .9 1.9 .6 .5 2.1 tape change times (hhmm): 0000 0329 0000 0000 0650 0000 0000 0409 0000 1535 0000 0000 0000 0000 0000 1535 # OF OBSERVATIONS BY BASELINE | 15 Ft Hh Ho Kb Oh Sh Sv StnTotal ---------------------------------------------- 15|240 86 4 26 116 20 60 95 407 Ft| 127 45 0 0 17 1 39 188 Hh| 117 43 14 16 25 54 201 Ho| 145 65 37 56 7 234 Kb| 245 1 132 130 458 Oh| 59 0 2 93 Sh| 152 76 350 Sv| 214 403 Number of 2-station scans: 280 Number of 3-station scans: 151 Number of 4-station scans: 69 Number of 5-station scans: 2 Number of 6-station scans: 0 Number of 7-station scans: 0 Number of 8-station scans: 0 Total # of scans, observations: 502 1167 =========================================================== 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 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 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 Sv SVETLOE 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 Sv 25 25 25 25 25 15 25 Sv 25 25 25 25 25 15 25