IVS-T2018 (International VLBI Service - Terrestical reference frame observations) 2003 Jun 17/18 Geodetic Institute of the University of Bonn, Germany Correlator: WASH 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 20 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 T2018 Experiment description: IVS-T2018 Scheduler: Mueskens Correlator: BONN Nominal start: 2003-168-17:30:00 Nominal end: 2003-169-17:30:01 Current yyyyddd: 2003168 (2003.46) ( 12808 MJD, TUES 17JUN.) Greenwich sidereal time: 11:12:14.11 (17:30: 0 UT) Sun's RA and DEC: 5h 43.1m 23d 22.9 =========================================================== First observations Source Start DURATIONS name yyddd-hhmmss Yk 65 Ft Gc Kb Ny Ur Yb 4C39.25 03168-173000| 60 60 60 60 60| 0727-115 03168-173330| 213 213| 2145+067 03168-173700| 206 60 60 206 | 0106+013 03168-174249| 125 72 125 | 0552+398 03168-174524| 60 421 421 169 257| End of listing. =========================================================== Last observations Source Start DURATIONS name yyddd-hhmmss Yk 65 Ft Gc Kb Ny Ur Yb 1034-293 03169-170115| 404 404 | 1044+719 03169-170522| 175 87 175 | 1741-038 03169-170948| 60 60 | CTA26 03169-171147| 229 229 | 1622-253 03169-171154| 97 97 | 1921-293 03169-171444| 60 60 | End of listing. =========================================================== Average number of obs. per baseline per source (normalized by up-time) = 1.9 Min = .0 Max = 28.6 (Baseline Gc-Kb on 0727-115) RMS = 4.0 Total time: 1425 minutes ( 23.8 hours). Key: Yk=ARIES_9M 65=DSS65 Ft=FORTLEZA Gc=GILCREEK Kb=KASHIM34 Ny=NYALES20 Ur=URUMQI Yb=YEBES Yk 65 Ft Gc Kb Ny Ur Yb Avg % obs. time: 17 31 33 49 41 40 50 21 35 % cal. time: 0 2 1 2 2 2 2 0 1 % slew time: 9 45 18 17 30 11 19 6 19 % idle time: 72 21 47 30 24 45 26 71 42 total # scans: 77 204 103 234 250 196 228 59 168 # scans/hour : 3 8 4 9 10 8 9 2 7.0 Avg scan (sec): 196 129 275 179 143 177 190 311 200 Total GBytes: 119 208 223 331 281 273 341 144 240 # of tapes : 1.0 .5 1.9 .8 2.3 .6 .8 .3 tape change times (hhmm): 1700 0000 0752 0000 0347 0000 0000 0000 0000 0000 0000 0000 1432 0000 0000 0000 # OF OBSERVATIONS BY BASELINE | Yk 65 Ft Gc Kb Ny Ur Yb StnTotal ---------------------------------------------- Yk| 77 8 7 68 51 25 22 10 191 65| 204 82 68 29 108 65 43 403 Ft| 103 14 0 16 10 31 160 Gc| 234 149 126 88 21 534 Kb| 250 92 172 12 505 Ny| 196 111 35 513 Ur| 228 29 497 Yb| 59 181 Number of 2-station scans: 262 Number of 3-station scans: 117 Number of 4-station scans: 56 Number of 5-station scans: 39 Number of 6-station scans: 6 Number of 7-station scans: 3 Number of 8-station scans: 0 Total # of scans, observations: 483 1492 =========================================================== Recording mode Name Code EUR2-SX SX Recording mode setup for: YLOW7296 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= 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: DSS65 GILCREEK NYALES20 URUMQI YEBES 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= 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 =========================================================== Tape types ID Station Tape length Density Passes 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 Kb KASHIM34 8700feet (Thick) 33333. (Low ) 12 Ny NYALES20 17400feet (Thin ) 56250. (High) 12 Ur URUMQI 17400feet (Thin ) 56250. (High) 12 Yb YEBES 17400feet (Thin ) 56250. (High) 12 =========================================================== SNR Targets Minimum SNR by baseline for multi-baseline scans X-band (margin 0) S-band (margin 0) Yk 65 Ft Gc Kb Ny Ur Yk 65 Ft Gc Kb Ny Ur 65 20 65 20 Ft 20 25 Ft 20 25 Gc 20 25 25 Gc 20 25 25 Kb 20 25 25 25 Kb 20 25 25 25 Ny 20 25 25 25 25 Ny 20 25 25 25 25 Ur 20 25 25 25 25 25 Ur 20 25 25 25 25 25 Yb 20 25 25 25 25 25 25 Yb 20 25 25 25 25 25 25