IVS-T2010 (International VLBI Service - Terrestical reference frame observations) 2002 Oct. 15/16 Geodetic Institute of the University of Bonn, Germany 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. Station: Code Crimea Sm FortLeza Ft Gilcreek Gc Hobart Ho Kokee Kk TigoConc Tc Tsukuba Ts DSS65 65 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 40 sec. and the most recent source flux models are included. SNR goals are 25 at X-band and at S-band for all baselines, except of Tc station. Here we have to reduce SNR minimum to 15, to get sure for getting a few number of observation ! 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-T2010 Scheduler: mueskens Correlator: BONN Nominal start: 2002-288-17:30:00 Nominal end: 2002-289-17:30:00 Current yyyyddd: 2002288 (2002.79) ( 12563 MJD, TUES 15OCT.) Greenwich sidereal time: 19: 6:18.04 (17:30: 0 UT) Sun's RA and DEC: 13h 22.1m -8d 38.4 =========================================================== First observations Observation listing from file /geo/SKED/sked006/sk_schedules/t2010.skd for experiment t2010 Source Start DURATIONS name yyddd-hhmmss Sm 65 Ft Gc Ho Kk Tc Ts 1357+769 02288-173000| 196 196 196 196 196 196| 0106+013 02288-173550| 40 40| OJ287 02288-173748| 40 40 40| 1741-038 02288-173856| 170 170 | CTA26 02288-174007| 40 40| End of listing. =========================================================== Last observations Observation listing from file /geo/SKED/sked006/sk_schedules/t2010.skd for experiment t2010 Source Start DURATIONS name yyddd-hhmmss Sm 65 Ft Gc Ho Kk Tc Ts 0955+476 02289-171700| 70 70 40| End of listing. Observation listing from file /geo/SKED/sked006/sk_schedules/t2010.skd for experiment t2010 Source Start DURATIONS name yyddd-hhmmss Sm 65 Ft Gc Ho Kk Tc Ts 0059+581 02289-170649| 200 200 120| 0119+115 02289-170950| 160 160| OJ287 02289-171401| 40 40 40| 4C39.25 02289-171537| 40 40 40| 1622-253 02289-171553| 100 100 | 0955+476 02289-171700| 70 70 40| End of listing. =========================================================== Total time: 1428 minutes ( 23.8 hours). Key: Sm=CRIMEA 65=DSS65 Ft=FORTLEZA Gc=GILCREEK Ho=HOBART26 Kk=KOKEE Tc=TIGO Ts=TSUKUB32 Sm 65 Ft Gc Ho Kk Tc Ts Avg % obs. time: 15 26 28 43 26 43 9 39 29 % cal. time: 1 3 2 4 2 4 0 5 3 % slew time: 11 50 24 26 38 20 1 23 24 % idle time: 72 19 45 26 32 31 88 30 43 total # scans: 90 268 175 397 195 409 36 491 257 # scans/hour : 3 11 7 16 8 17 1 20 10.7 Avg scan (sec): 147 84 138 93 116 90 221 69 119 Total GBytes: 104 179 190 291 178 290 62 269 195 # of tapes : .8 .4 1.5 .6 1.4 .6 .1 .6 tape change times (hhmm): 0000 0000 1016 0000 1028 0000 0000 0000 # OF OBSERVATIONS BY BASELINE | Sm 65 Ft Gc Ho Kk Tc Ts StnTotal ---------------------------------------------- Sm| 90 51 29 21 9 6 2 46 164 65| 268 141 99 2 21 3 69 386 Ft| 175 15 8 9 16 1 219 Gc| 397 38 284 2 291 750 Ho| 195 100 23 145 325 Kk| 409 11 317 748 Tc| 36 1 58 Ts| 491 870 Number of 2-station scans: 448 Number of 3-station scans: 301 Number of 4-station scans: 59 Number of 5-station scans: 4 Number of 6-station scans: 1 Number of 7-station scans: 0 Number of 8-station scans: 0 Total # of scans, observations: 813 1760 =========================================================== Recording mode Name Code EUR2-SX SX Recording mode setup for: CRIMEA FORTLEZA HOBART26 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 KOKEE TIGOCONC TSUKUB32 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 Sm CRIMEA 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 Ho HOBART26 8700feet (Thick) 33333. (Low ) 12 Kk KOKEE 17400feet (Thin ) 56250. (High) 12 Tc TIGOCONC 17400feet (Thin ) 56250. (High) 14 Ts TSUKUB32 17400feet (Thin ) 56250. (High) 12 =========================================================== SNR Targets Minimum SNR by baseline for multi-baseline scans X-band (margin 0) S-band (margin 0) Sm 65 Ft Gc Ho Kk Tc Sm 65 Ft Gc Ho Kk Tc 65 25 65 25 Ft 25 25 Ft 25 25 Gc 25 25 25 Gc 25 25 25 Ho 25 25 25 25 Ho 25 25 25 25 Kk 25 25 25 25 25 Kk 25 25 25 25 25 Tc 15 15 15 15 15 15 Tc 15 15 15 15 15 15 Ts 25 25 25 25 25 25 25 Ts 25 25 25 25 25 25 25