IVS-T2006 (International VLBI Service - Terrestical reference frame observations) 2002 Juni 25/26 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 25 at X-band and 22 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 scheduled in tagalong mode !! 45 will not observed from 177-0001 until 177-1010 UT 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 t2006 Experiment description: IVS-T2006 Scheduler: mueskens Correlator: BONN Nominal start: 2002-176-17:30:01 Nominal end: 2002-177-17:30:01 Current yyyyddd: 2002176 (2002.48) ( 12451 MJD, TUES 25JUN.) Greenwich sidereal time: 11:44:44.85 (17:30: 1 UT) Sun's RA and DEC: 6h 17.4m 23d 22.7 =========================================================== First observations Observation listing from file t2006.skd for experiment t2006 Source Start DURATIONS name yyddd-hhmmss Ap 45 Gc Hh Kk Mc Ts Yb Yk 1124-186 02176-173001| 90 90 | 2121+053 02176-173304| 40 50 50 40 | 1334-127 02176-173359| 110 110 | 2234+282 02176-173617| 200 200 40 200| 0727-115 02176-173620| 40 40 | =========================================================== Last observations Observation listing from file t2006.skd for experiment t2006 Source Start DURATIONS name yyddd-hhmmss Ap 45 Gc Hh Kk Mc Ts Yb Yk 0106+013 02177-171516| 110 110 40 40 110| Observation listing from file t2006.skd for experiment t2006 Source Start DURATIONS name yyddd-hhmmss Ap 45 Gc Hh Kk Mc Ts Yb Yk 0955+476 02177-170455| 40 50 50 | OJ287 02177-170755| 40 130 150 50 150 150| 1921-293 02177-171024| 60 60 | 1128+385 02177-171102| 50 110 110 | 1334-127 02177-171455| 100 100 | 0106+013 02177-171516| 110 110 40 40 110| =========================================================== 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 16 37 21 31 38 35 11 28 26 % cal. time: 3 2 4 1 4 4 5 0 3 3 % slew time: 50 22 20 24 14 33 20 6 27 24 % idle time: 24 58 36 52 49 23 38 80 40 45 # of tapes : 1.0 .3 .5 .3 .5 .5 .5 .2 1.5 total # scans: 303 214 386 129 352 375 491 80 268 288 # scans/hour : 12 8 16 5 14 15 20 3 11 12.0 Avg scan (sec): 61 65 83 141 76 87 61 120 92 87 tape change times (hhmm): # OF OBSERVATIONS BY BASELINE | Ap 45 Gc Hh Kk Mc Ts Yb Yk StnTotal -------------------------------------------------- Ap|303 12 235 21 149 196 161 33 189 996 45| 214 71 19 137 5 204 0 42 490 Gc| 386 7 266 184 302 28 232 1325 Hh| 129 0 110 21 38 9 225 Kk| 352 90 324 1 176 1143 Mc| 375 167 77 149 978 Ts| 491 12 190 1381 Yb| 80 26 215 Yk| 268 1013 Number of 2-station scans: 216 Number of 3-station scans: 176 Number of 4-station scans: 153 Number of 5-station scans: 139 Number of 6-station scans: 54 Number of 7-station scans: 1 Number of 8-station scans: 0 Number of 9-station scans: 0 Total # of scans, observations: 739 3883 =========================================================== 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)