IVS-T20096 (International VLBI Service - Terrestical reference frame observations) 2002 Sept. 17/18 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 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 !! ---------------------------------------- Ap=ALGOPARK was scheduled as a thin tape station !!! ---------------------------------------------------- Parameter values for experiment t2009 Experiment description: IVS-T2009 Scheduler: mueskens Correlator: BONN Nominal start: 2002-260-17:30:01 Nominal end: 2002-261-17:30:01 Current yyyyddd: 2002260 (2002.71) ( 12535 MJD, TUES 17SEP.) Greenwich sidereal time: 17:15:55.50 (17:30: 1 UT) Sun's RA and DEC: 11h 40.4m 2d 7.5 =========================================================== First observations Observation listing from file /geo/SKED/sked006/sk_schedules/t2009.skd for experiment t2009 Source Start DURATIONS name yyddd-hhmmss Gc Ap Kk 45 Hh Mc Ts Yb Yk 0059+581 02260-173001| 190 60 190 130 | 0727-115 02260-173450| 40 40 40 | 1921-293 02260-173630| 50 40 50 | 0552+398 02260-173753| 40 40 60 100 50 100| 2134+00 02260-173943| 40 40 | End of listing. =========================================================== Last observations Observation listing from file /geo/SKED/sked006/sk_schedules/t2009.skd for experiment t2009 Source Start DURATIONS name yyddd-hhmmss Gc Ap Kk 45 Hh Mc Ts Yb Yk 1606+106 02261-172032| 40 40 | End of listing. Observation listing from file /geo/SKED/sked006/sk_schedules/t2009.skd for experiment t2009 Source Start DURATIONS name yyddd-hhmmss Gc Ap Kk 45 Hh Mc Ts Yb Yk 1741-038 02261-170641| 340 50 340 | 0552+398 02261-171023| 40 40 40 40 | 0229+131 02261-171215| 100 100 40 | 0718+793 02261-171339| 100 100 | 1357+769 02261-171650| 60 40 60 50 40 | 1606+106 02261-172032| 40 40 | End of listing. =========================================================== Average number of obs. per baseline per source (normalized by up-time) = 3.3 Min = .0 Max = 42.2 (Baseline 45-Ts on 0805+410) RMS = 6.6 Total time: 1431 minutes ( 23.9 hours). Key: Gc=GILCREEK Ap=ALGOPARK Kk=KOKEE 45=DSS45 Hh=HARTRAO Mc=MEDICINA Ts=TSUKUB32 Yb=YEBES Yk=ARIES_9M Gc Ap Kk 45 Hh Mc Ts Yb Yk Avg % obs. time: 33 23 34 31 24 35 33 13 8 26 % cal. time: 4 3 4 4 1 4 5 0 1 3 % slew time: 21 53 17 41 29 34 20 6 9 26 % idle time: 40 19 44 23 43 25 41 79 80 44 total # scans: 344 318 372 367 157 376 469 83 86 285 # scans/hour : 14 13 15 15 6 15 19 3 3 11.9 Avg scan (sec): 83 63 79 73 133 81 60 135 89 88 Total GBytes: 225 157 231 211 165 242 224 88 60 178 # of tapes : .5 .3 .5 .5 .4 .5 .5 .2 .5 tape change times (hhmm): # OF OBSERVATIONS BY BASELINE | Gc Ap Kk 45 Hh Mc Ts Yb Yk StnTotal -------------------------------------------------- Gc|344 208 219 99 1 146 217 18 72 980 Ap| 318 148 22 25 184 103 31 47 768 Kk| 372 230 0 57 277 0 70 1001 45| 367 36 19 315 0 33 754 Hh| 157 122 21 43 0 248 Mc| 376 129 78 13 748 Ts| 469 7 46 1115 Yb| 83 1 178 Yk| 86 282 Number of 2-station scans: 331 Number of 3-station scans: 282 Number of 4-station scans: 155 Number of 5-station scans: 72 Number of 6-station scans: 14 Number of 7-station scans: 0 Number of 8-station scans: 0 Number of 9-station scans: 0 Total # of scans, observations: 854 3037 =========================================================== Recording mode Name Code EUR2-SX SX Recording mode setup for: ALGOPARK 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 Recording mode setup for: 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 =========================================================== Tape types ID Station Tape length Density Passes Ap ALGOPARK 17400feet (Thin ) 56250. (High) 12 Yk YLOW7296 8700feet (Thick) 33333. (Low ) 12 45 DSS45 17400feet (Thin ) 56250. (High) 12 Gc GILCREEK 17400feet (Thin ) 56250. (High) 12 Hh HARTRAO 17400feet (Thin ) 56250. (High) 12 Kk KOKEE 17400feet (Thin ) 56250. (High) 12 Mc MEDICINA 17400feet (Thin ) 56250. (High) 12 Ts TSUKUB32 17400feet (Thin ) 56250. (High) 12 Yb YEBES 17400feet (Thin ) 56250. (High) 12 ===========================================================