IVS-T2004 (International VLBI Service - Terrestical reference frame observations) 2002 April 09/10 Notes prepared by Arno Mueskens Geodetic Institute of the University of Bonn, Germany =========================================================== Parameter values for experiment t2004 Experiment description: IVS-T2004 Scheduler: mueskens Correlator: BONN Nominal start: 2002-099-17:30:00 Nominal end: 2002-100-17:30:00 Current yyyyddd: 2002099 (2002.27) ( 12374 MJD, TUES 9APR.) Greenwich sidereal time: 6:41: 9.08 (17:30: 0 UT) Sun's RA and DEC: 1h 12.7m 7d 42.2 =========================================================== First observations Observation listing from file t2004.skd for experiment t2004 Source Start DURATIONS name yyddd-hhmmss Gc Hh Kk Nt Sh Wf Wz Gg 0552+398 02099-173000| 170 180 40 180 40 180| 1622-253 02099-173001| 340 340 | 1308+326 02099-173423| 40 40 | 1300+580 02099-173804| 110 150 140 160 160 160| 1334-127 02099-173853| 40 40 | =========================================================== Last observations Observation listing from file t2004.skd for experiment t2004 Source Start DURATIONS name yyddd-hhmmss Gc Hh Kk Nt Sh Wf Wz Gg 0552+398 02100-172255| 170 180 40 180 40 180| End of listing. Observation listing from file t2004.skd for experiment t2004 Source Start DURATIONS name yyddd-hhmmss Gc Hh Kk Nt Sh Wf Wz Gg 1308+326 02100-171030| 40 40 | 2234+282 02100-171212| 40 40 40| 1034-293 02100-171320| 130 130 | 1124-186 02100-171708| 70 70 | 0552+398 02100-172255| 170 180 40 180 40 180| =========================================================== 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: Gg was schedules in tagalong mode !! FREQUENCY SEQUENCE ================== Recording mode Name Code EUR2-SX SX Recording mode setup for: GILCREEK Mode Tot.Rate Tot.BandW #chan #bits Barrel VLBA1:2 128.000 Mbits 64.000 MHz 14 1 8:1 Chan.BW #Subpasses Tracks(*fan) Tot.tracks Speed 4.00 MHz 1 16(*2) 32 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 10.000 6.000 16.000 Recording mode setup for: HARTRAO NOTO GGAO7108 SESHAN25 WESTFORD WETTZELL Mode Tot.Rate Tot.BandW #chan #bits Barrel Mk341:2 128.000 Mbits 64.000 MHz 14 1 NONE Chan.BW #Subpasses Tracks(*fan) Tot.tracks Speed 4.00 MHz 1 16(*2) 32 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 10.000 6.000 16.000 Recording mode setup for: KOKEE Mode Tot.Rate Tot.BandW #chan #bits Barrel VLBA1:2 128.000 Mbits 64.000 MHz 14 1 16:1 Chan.BW #Subpasses Tracks(*fan) Tot.tracks Speed 4.00 MHz 1 16(*2) 32 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 10.000 6.000 16.000 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 A 10 SECOND EARLY TAPE START !! ---------------------------------------------- Appendix ========== Total time: 1435 minutes ( 23.9 hours). Key: Gc=GILCREEK Hh=HARTRAO Kk=KOKEE Nt=NOTO Sh=SESHAN25 Wf=WESTFORD Wz=WETTZELL Gg=ORION_5M Gc Hh Kk Nt Sh Wf Wz Gg Avg % obs. time: 40 18 47 34 27 38 38 40 35 % cal. time: 4 1 5 4 2 3 4 3 3 % slew time: 26 30 19 40 34 15 11 10 23 % idle time: 28 48 28 20 35 41 44 44 36 # of tapes : 1.1 .5 1.3 1.0 .8 1.1 1.1 1.1 total # scans: 424 162 440 402 203 321 400 334 335 # scans/hour : 17 6 18 16 8 13 16 13 14.0 Avg scan (sec): 81 99 92 74 117 103 83 104 94 tape change times (hhmm): 1533 0000 1226 0000 0000 1644 1607 1554 # OF OBSERVATIONS BY BASELINE | Gc Hh Kk Nt Sh Wf Wz Gg StnTotal ---------------------------------------------- Gc|424 9 350 113 108 192 145 234 1151 Hh| 162 0 144 40 38 116 25 372 Kk| 440 48 150 176 71 217 1012 Nt| 402 54 183 364 150 1056 Sh| 203 37 67 32 488 Wf| 321 191 255 1072 Wz| 400 163 1117 Gg| 334 1076 Number of 2-station scans: 272 Number of 3-station scans: 262 Number of 4-station scans: 153 Number of 5-station scans: 88 Number of 6-station scans: 32 Number of 7-station scans: 16 Number of 8-station scans: 0 Total # of scans, observations: 823 3672 ID Station Tape length Density Gc GILCREEK 17400feet (Thin ) 56700. (High) Hh HARTRAO 17400feet (Thin ) 56250. (High) Kk KOKEE 17400feet (Thin ) 56700. (High) Nt NOTO 17400feet (Thin ) 56250. (High) Gg GGAO7108 17400feet (Thin ) 56250. (High) Sh SESHAN25 17400feet (Thin ) 56250. (High) Wf WESTFORD 17400feet (Thin ) 56250. (High) Wz WETTZELL 17400feet (Thin ) 56250. (High)