IVS-T2021 (International VLBI Service - Terrestical reference frame observations) 2003 Sept 16/17 doy 259 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 !! ------------------------------------- Experiment description: IVS-T2021 Scheduler: Mueskens Correlator: BONN Nominal start: 2003-259-17:30:00 Nominal end: 2003-260-17:30:01 Current yyyyddd: 2003259 (2003.71) ( 12899 MJD, TUES 16SEP.) Greenwich sidereal time: 17:11: .65 (17:30: 0 UT) Sun's RA and DEC: 11h 35.9m 2d 36.3 =========================================================== First observations Source Start DURATIONS name yyddd-hhmmss Sm 45 Ka Nt On Gg Wf 0059+581 03259-173000| 215 261 119 261 215| 0727-115 03259-173000| 300 300 | 2121+053 03259-173615| 60 60 | 0454-234 03259-173737| 60 60 | 1921-293 03259-173859| 60 60 | End of listing. =========================================================== Last observations Source Start DURATIONS name yyddd-hhmmss Sm 45 Ka Nt On Gg Wf 0229+131 03260-171224| 84 84 | 1741-038 03260-171327| 60 60 60 | 0048-097 03260-171531| 195 195 | 2121+053 03260-171650| 60 60 | 0106+013 03260-171948| 60 60 | 0104-408 03260-172258| 66 66 | End of listing. =========================================================== Average number of obs. per baseline per source (normalized by up-time) = 2.0 Min = .0 Max = 32.3 (Baseline 45-Ka on CTA26 ) RMS = 4.7 Total time: 1434 minutes ( 23.9 hours). Key: Sm=CRIMEA 45=DSS45 Ka=KASHIMA Nt=NOTO On=ONSALA60 Gg=ORION_5M Wf=WESTFORD Sm 45 Ka Nt On Gg Wf Avg % obs. time: 41 41 46 42 49 32 67 46 % cal. time: 1 2 2 2 1 0 1 2 % slew time: 19 31 20 25 9 1 8 16 % idle time: 37 24 30 29 38 64 22 35 total # scans: 150 247 258 198 154 65 161 176 # scans/hour : 6 10 10 8 6 2 6 7.3 Avg scan (sec): 235 144 156 186 279 436 362 256 Total GBytes: 278 280 317 290 338 223 459 312 # of tapes : 2.3 .6 2.5 .7 .8 .5 1.0 tape change times (hhmm): 0300 0000 0228 0000 0000 0000 1642 1259 0000 1238 0000 0000 0000 0000 # OF OBSERVATIONS BY BASELINE | Sm 45 Ka Nt On Gg Wf StnTotal ------------------------------------------ Sm|150 24 40 137 113 1 44 359 45| 247 225 22 9 2 7 289 Ka| 258 34 40 0 25 364 Nt| 198 140 6 84 423 On| 154 5 75 382 Gg| 65 64 78 Wf| 161 299 Number of 2-station scans: 338 Number of 3-station scans: 81 Number of 4-station scans: 56 Number of 5-station scans: 18 Number of 6-station scans: 0 Number of 7-station scans: 0 Total # of scans, observations: 493 1097 =========================================================== Recording mode Name Code EUR-SX SX Recording mode setup for: CRIMEA KASHIMA 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 Recording mode setup for: DSS45 NOTO ONSALA60 GGAO7108 WESTFORD 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 =========================================================== Tape types ID Station Tape length Density Passes Sm CRIMEA 8700feet (Thick) 33333. (Low ) 12 45 DSS45 17400feet (Thin ) 56250. (High) 12 Ka KASHIMA 8700feet (Thick) 33333. (Low ) 12 Nt NOTO 17400feet (Thin ) 56250. (High) 12 On ONSALA60 17400feet (Thin ) 56250. (High) 12 Gg GGAO7108 17400feet (Thin ) 56250. (High) 12 Wf WESTFORD 17400feet (Thin ) 56250. (High) 12 =========================================================== SNR Targets Minimum SNR by baseline for multi-baseline scans X-band (margin 5) S-band (margin 5) Sm 45 Ka Nt On Gg Sm 45 Ka Nt On Gg 45 25 45 25 Ka 25 25 Ka 25 25 Nt 25 25 25 Nt 25 25 25 On 25 25 25 25 On 25 25 25 25 Gg 15 15 15 15 15 Gg 15 15 15 15 15 Wf 25 25 25 25 25 15 Wf 25 25 25 25 25 15