IVS-T2007 (International VLBI Service - Terrestical reference frame observations) 2002 July 09/10 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 23 at X-band and 20 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 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 NO EARLY TAPE START !! ----------------------------------------- DSS15 will start 1.5 hours later at 190-1905 UT ------------------------------------------------ Parameter values for experiment t2007 Experiment description: IVS-T2007 Scheduler: mueskens Correlator: BONN Nominal start: 2002-190-17:30:01 Nominal end: 2002-191-17:30:01 Current yyyyddd: 2002190 (2002.52) ( 12465 MJD, TUES 9JUL.) Greenwich sidereal time: 12:39:56.62 (17:30: 1 UT) Sun's RA and DEC: 7h 15.2m 22d 18.9 =========================================================== First observations Observation listing from file t2007.skd for experiment t2007 Source Start DURATIONS name yyddd-hhmmss 15 Gc Kk Ma Ny On Ts Ur 0552+398 02190-173001| 40 40 40 40 40 | 0718+793 02190-173304| 80 80 50 | 0804+499 02190-173516| 160 250 200 250| 1357+769 02190-174149| 100 120 140 130 170 50 170| 1044+719 02190-174432| 50 50 40 | End of listing. =========================================================== Last observations Observation listing from file t2007.skd for experiment t2007 Source Start DURATIONS name yyddd-hhmmss 15 Gc Kk Ma Ny On Ts Ur 1128+385 02191-172145| 80 200 250 230 310 310| End of listing. Observation listing from file t2007.skd for experiment t2007 Source Start DURATIONS name yyddd-hhmmss 15 Gc Kk Ma Ny On Ts Ur 1741-038 02191-170549| 40 40 40 40| 1958-179 02191-170729| 40 40| 0552+398 02191-170856| 40 40 80 80 40 60 | 1300+580 02191-171209| 40 90 140 110 50 140| 0955+476 02191-171548| 40 70 90 80 110 110| 1128+385 02191-172145| 80 200 250 230 310 310| End of listing. =========================================================== Key: 15=DSS15 Gc=GILCREEK Kk=KOKEE Ma=MATERA Ny=NYALES20 On=ONSALA60 Ts=TSUKUB32 Ur=URUMQI 15 Gc Kk Ma Ny On Ts Ur Avg % obs. time: 27 33 40 35 31 37 32 38 34 % cal. time: 5 4 5 4 4 4 6 4 4 % slew time: 40 23 18 28 18 21 20 32 25 % idle time: 27 38 35 32 45 36 41 24 35 # of tapes : .6 .9 1.0 .9 .9 .9 .8 .9 total # scans: 439 395 508 369 353 388 516 399 420 # scans/hour : 18 16 21 15 14 16 21 16 17.5 Avg scan (sec): 52 73 68 82 77 83 54 82 71 tape change times (hhmm): # OF OBSERVATIONS BY BASELINE | 15 Gc Kk Ma Ny On Ts Ur StnTotal ---------------------------------------------- 15|439 278 342 74 123 101 158 66 1142 Gc| 395 266 99 185 133 242 134 1337 Kk| 508 29 104 65 314 107 1227 Ma| 369 243 338 114 216 1113 Ny| 353 284 184 224 1347 On| 388 140 225 1286 Ts| 516 285 1437 Ur| 399 1257 Number of 2-station scans: 420 Number of 3-station scans: 206 Number of 4-station scans: 165 Number of 5-station scans: 103 Number of 6-station scans: 69 Number of 7-station scans: 40 Number of 8-station scans: 5 Total # of scans, observations: 1008 5073 =========================================================== Recording mode Name Code EUR2-SX SX Recording mode setup for: DSS15 MATERA NYALES20 ONSALA60 TSUKUB32 URUMQI 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: 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: 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 =========================================================== Tape types ID Station Tape length Density 15 DSS15 17400feet (Thin ) 56250. (High) Gc GILCREEK 17400feet (Thin ) 56700. (High) Kk KOKEE 17400feet (Thin ) 56700. (High) Ma MATERA 17400feet (Thin ) 56250. (High) Ny NYALES20 17400feet (Thin ) 56250. (High) On ONSALA60 17400feet (Thin ) 56250. (High) Ts TSUKUB32 17400feet (Thin ) 56250. (High) Ur URUMQI 17400feet (Thin ) 56250. (High)