IVS-T2014 (International VLBI Service - Terrestical reference frame observations) 2003 Feb. 04/05 Notes prepared by Arno Mueskens Geodetic Institute of the University of Bonn, Germany Correlator: WASH 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 15 to 25 at X-band and 12 to 20 at S-band depent on different baselines and stations. 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 !! ---------------------------------------- Parameter values for experiment T2014 Experiment description: IVS-T2014 (incl. Ohiggins) Scheduler: Mueskens Correlator: WASH Nominal start: 2003-035-17:30:00 Nominal end: 2003-036-17:30:01 Current yyyyddd: 2003035 (2003.10) ( 12675 MJD, TUES 4FEB.) Greenwich sidereal time: 2:27:52.24 (17:30: 0 UT) Sun's RA and DEC: 21h 11.8m -16d 11.6 =========================================================== First observations Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Kk Oh Tc Ts Wz 0537-441 03035-173000| 273 60 273 79 | 0955+476 03035-173000| 82 60 82| 2134+00 03035-173342| 760 760 | 0059+581 03035-173345| 70 70| NRAO512 03035-173555| 60 60 | =========================================================== Last observations Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Kk Oh Tc Ts Wz 0749+540 03036-170607| 105 105| 0727-115 03036-171102| 60 87 60 87| 0528+134 03036-171317| 60 60| 0537-441 03036-171503| 60 60 60 | NRAO512 03036-171607| 60 60 | 1726+455 03036-171750| 268 215 268| =========================================================== Key: Ft=FORTLEZA Hh=HARTRAO Ho=HOBART26 Kk=KOKEE Oh=OHIGGINS Tc=TIGO Ts=TSUKUB32 Wz=WETTZELL Ft Hh Ho Kk Oh Tc Ts Wz Avg % obs. time: 49 39 44 53 33 46 40 57 45 % cal. time: 1 1 2 3 0 0 3 2 2 % slew time: 20 30 34 15 5 2 17 8 16 % idle time: 28 28 19 27 60 49 37 31 35 total # scans: 118 144 184 280 59 69 343 216 176 # scans/hour : 4 6 7 11 2 2 14 9 7.4 Avg scan (sec): 359 234 207 164 492 581 101 229 295 Total GBytes: 333 265 301 362 228 316 273 389 308 # of tapes : 3.0 .6 2.5 .8 .5 .6 .6 .8 tape change times (hhmm): 0038 0000 0306 0000 0000 0000 0000 0000 0906 0000 1202 0000 0000 0000 0000 0000 # OF OBSERVATIONS BY BASELINE | Ft Hh Ho Kk Oh Tc Ts Wz StnTotal ---------------------------------------------- Ft|118 65 3 17 28 47 10 71 241 Hh| 144 49 0 32 25 36 80 287 Ho| 184 104 29 14 116 8 323 Kk| 280 11 18 237 62 449 Oh| 59 32 1 11 144 Tc| 69 3 13 152 Ts| 343 135 538 Wz| 216 380 Number of 2-station scans: 269 Number of 3-station scans: 228 Number of 4-station scans: 39 Number of 5-station scans: 7 Total # of scans, observations: 543 1257 =========================================================== Recording mode Name Code EUR2-SX SX Recording mode setup for: FORTLEZA HOBART26 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: HARTRAO KOKEE OHIGGINS TIGOCONC TSUKUB32 WETTZELL 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 Passes Ft FORTLEZA 8700feet (Thick) 33333. (Low ) 12 Hh HARTRAO 17400feet (Thin ) 56250. (High) 12 Ho HOBART26 8700feet (Thick) 33333. (Low ) 12 Kk KOKEE 17400feet (Thin ) 56250. (High) 12 Oh OHIGGINS 17400feet (Thin ) 56250. (High) 12 Tc TIGOCONC 17400feet (Thin ) 56250. (High) 14 Ts TSUKUB32 17400feet (Thin ) 56250. (High) 12 Wz WETTZELL 17400feet (Thin ) 56250. (High) 12 =========================================================== SNR Targets Minimum SNR by baseline for multi-baseline scans X-band (margin 5) S-band (margin 5) Ft Hh Ho Kk Oh Tc Ts Ft Hh Ho Kk Oh Tc Ts Hh 20 Hh 20 Ho 20 20 Ho 20 20 Kk 20 20 20 Kk 20 20 20 Oh 15 15 15 15 Oh 12 12 12 12 Tc 15 15 15 15 15 Tc 12 12 20 12 12 Ts 20 15 20 20 15 15 Ts 20 20 20 20 12 12 Wz 20 20 20 20 15 15 20 Wz 20 20 20 20 12 12 20