IVS-T2011 (International VLBI Service - Terrestical reference frame observations) 2002 Nov. 19/20 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 OHIGGINS Oh 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 25 at X-band and at S-band for all baselines, except of Tc/Oh station. Here we have to reduce SNR minimum to 12, 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 10 SECOND EARLY TAPE START !! ----------------------------------------------- Parameter values for experiment T2011 Experiment description: IVS-T2011 (incl. Ohiggins) Correlator: BONN Nominal start: 2002-323-17:30:00 Nominal end: 2002-324-17:30:01 Current yyyyddd: 2002323 (2002.88) ( 12598 MJD, TUES 19NOV.) Greenwich sidereal time: 21:24:17.48 (17:30: 0 UT) Sun's RA and DEC: 15h 39.7m -19d 32.1 =========================================================== First observations Source Start DURATIONS name yyddd-hhmmss Sm 65 Ft Gc Ho Kk Oh Tc Ts 1357+769 02323-173000| 420 60 420 | 1741-038 02323-173000| 716 716 | 1749+096 02323-173000| 176 176 | 0402-362 02323-173000| 89 89| 1044+719 02323-173519| 204 204 64| End of listing. =========================================================== Last observations Source Start DURATIONS name yyddd-hhmmss Sm 65 Ft Gc Ho Kk Oh Tc Ts 0059+581 02324-170709| 322 322 162| 1144-379 02324-170737| 116 116 | 1124-186 02324-171107| 138 138 | 1308+326 02324-171438| 85 85 60| 1128+385 02324-171649| 107 107 60| 1921-293 02324-171743| 63 63 | End of listing. =========================================================== Key: Sm=CRIMEA 65=DSS65 Ft=FORTLEZA Gc=GILCREEK Ho=HOBART26 Kk=KOKEE Oh=OHIGGINS Tc=TIGO Ts=TSUKUB32 Sm 65 Ft Gc Ho Kk Oh Tc Ts Avg % obs. time: 24 18 43 34 37 41 64 75 22 40 % cal. time: 0 1 1 1 1 1 1 1 2 1 % slew time: 10 37 16 11 20 10 7 4 8 14 % idle time: 64 42 39 52 40 46 26 19 66 44 total # scans: 65 110 90 153 105 169 90 99 179 117 # scans/hour : 2 4 3 6 4 7 3 4 7 4.9 Avg scan (sec): 323 141 410 191 305 209 614 649 109 327 Total GBytes: 170 131 297 242 260 292 442 514 168 279 # of tapes : 1.6 .3 2.6 .5 2.2 .7 1.0 1.0 .4 tape change times (hhmm): 1054 0000 0345 0000 0504 0000 1611 1702 0000 0000 0000 1215 0000 1551 0000 0000 0000 0000 # OF OBSERVATIONS BY BASELINE | Sm 65 Ft Gc Ho Kk Oh Tc Ts StnTotal -------------------------------------------------- Sm| 65 47 23 19 10 8 17 15 31 170 65| 110 54 43 1 17 27 34 31 254 Ft| 90 11 5 12 50 65 0 220 Gc| 153 13 116 6 17 112 337 Ho| 105 47 39 23 56 194 Kk| 169 21 33 121 375 Oh| 90 66 7 233 Tc| 99 4 257 Ts| 179 362 Number of 2-station scans: 130 Number of 3-station scans: 129 Number of 4-station scans: 74 Number of 5-station scans: 21 Number of 6-station scans: 2 Number of 7-station scans: 0 Number of 8-station scans: 0 Number of 9-station scans: 0 Total # of scans, observations: 356 1201 =========================================================== 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 OHIGGINS 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 Oh OHIGGINS 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 5) S-band (margin 5) Sm 65 Ft Gc Ho Kk Oh Tc Sm 65 Ft Gc Ho Kk Oh Tc 65 25 65 20 Ft 25 25 Ft 20 20 Gc 25 25 25 Gc 20 20 20 Ho 25 25 25 25 Ho 20 20 20 20 Kk 25 25 25 25 25 Kk 20 20 20 20 20 Oh 15 15 15 15 15 15 Oh 12 12 12 12 12 12 Tc 15 15 15 15 15 15 15 Tc 12 12 12 12 20 12 12 Ts 25 25 25 25 25 25 15 15 Ts 20 20 20 20 20 20 20 20