IVS-T2005 (International VLBI Service - Terrestical reference frame observations) 2002 Mai 07/08 Notes prepared by Arno Mueskens 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. 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 20 at X-band and 18 at S-band for all baselines. 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 NOTE: Yk was schedules in tagalong mode !! 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 t2005 Experiment description: IVS-T2005 Scheduler: mueskens Correlator: BONN Nominal start: 2002-127-17:30:00 Nominal end: 2002-128-17:30:00 Current yyyyddd: 2002127 (2002.35) ( 12402 MJD, TUES 7MAY.) Greenwich sidereal time: 8:31:32.63 (17:30: 0 UT) Sun's RA and DEC: 2h 58.1m 16d 54.5 =========================================================== First observations Observation listing from file t2005.skd for experiment t2005 Source Start DURATIONS name yyddd-hhmmss Ap 45 Gc Hh Kk Mc Ts Yb Yk 0059+581 02127-173000| 40 80 80 40 40 40 40| 1606+106 02127-173000| 40 40 40 40 | 1124-186 02127-173000| 90 90 | End of listing. =========================================================== Last observations Observation listing from file t2005.skd for experiment t2005 Source Start DURATIONS name yyddd-hhmmss Ap 45 Gc Hh Kk Mc Ts Yb Yk 1124-186 02128-172043| 90 90 | End of listing. Observation listing from file t2005.skd for experiment t2005 Source Start DURATIONS name yyddd-hhmmss Ap 45 Gc Hh Kk Mc Ts Yb Yk 1351-018 02128-171201| 50 50 | 1622-253 02128-171427| 40 40 | 0552+398 02128-171533| 40 60 40 60 60| 1144-379 02128-171653| 110 110 | 0528+134 02128-171722| 40 40 40| 1124-186 02128-172043| 90 90 | End of listing. =========================================================== Average number of obs. per baseline per source (normalized by up-time) = 3.7 Min = .0 Max = 39.3 (Baseline Gc-Kk on 1334-127) RMS = 6.3 Total time: 1432 minutes ( 23.9 hours). Key: Ap=ALGOPARK 45=DSS45 Gc=GILCREEK Hh=HARTRAO Kk=KOKEE Mc=MEDICINA Ts=TSUKUB32 Yb=YEBES Yk=ARIES_9M Ap 45 Gc Hh Kk Mc Ts Yb Yk Avg % obs. time: 21 31 33 25 33 37 31 12 28 28 % cal. time: 3 4 3 1 4 3 5 0 2 3 % slew time: 54 43 20 31 16 33 19 8 27 28 % idle time: 21 20 42 41 45 25 43 78 41 39 # of tapes : 1.0 .5 .5 .4 .5 .5 .5 .2 1.5 total # scans: 292 371 315 161 363 339 431 80 252 289 # scans/hour : 12 15 13 6 15 14 18 3 10 12.1 Avg scan (sec): 63 73 92 134 78 94 63 131 96 91 tape change times (hhmm): 1635 0000 0000 0000 0000 0000 0000 0000 1036 # OF OBSERVATIONS BY BASELINE | Ap 45 Gc Hh Kk Mc Ts Yb Yk StnTotal -------------------------------------------------- Ap|292 26 203 20 151 170 119 30 186 905 45| 371 97 55 227 20 279 0 64 768 Gc| 315 1 209 154 217 25 200 1106 Hh| 161 0 107 18 37 9 247 Kk| 363 64 252 3 148 1054 Mc| 339 137 75 127 854 Ts| 431 14 137 1173 Yb| 80 29 213 Yk| 252 900 Number of 2-station scans: 286 Number of 3-station scans: 204 Number of 4-station scans: 138 Number of 5-station scans: 120 Number of 6-station scans: 40 Number of 7-station scans: 4 Number of 8-station scans: 0 Number of 9-station scans: 0 Total # of scans, observations: 792 3610 =========================================================== Recording mode Name Code EUR2-SX SX Recording mode setup for: ALGOPARK YLOW7296 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: DSS45 GILCREEK HARTRAO KOKEE MEDICINA TSUKUB32 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 Ap ALGOPARK 8700feet (Thick) 33333. (Low ) Yk YLOW7296 8700feet (Thick) 33333. (Low ) 45 DSS45 17400feet (Thin ) 56250. (High) Gc GILCREEK 17400feet (Thin ) 56250. (High) Hh HARTRAO 17400feet (Thin ) 56250. (High) Kk KOKEE 17400feet (Thin ) 56250. (High) Mc MEDICINA 17400feet (Thin ) 56250. (High) Ts TSUKUB32 17400feet (Thin ) 56250. (High) Yb YEBES 17400feet (Thin ) 56250. (High) ===========================================================