IVS-T2025 (International VLBI Service - Terrestical Reference Frame Observations) 2004 Jan 13/14 doy 013/014 Geodetic Institute of the University of Bonn, Germany Correlator: BONN 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 60 sec. and the most recent source flux models are included. SNR goals are 15 to 25 at X-band and 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. =========================================================== Parameter values for experiment T2025 Experiment description: IVS-T2025 Scheduler: mueskens Correlator: BONN Nominal start: 2004-013-17:30:00 Nominal end: 2004-014-17:30:01 Current yyyyddd: 2004013 (2004.04) ( 13018 MJD, TUES 13JAN.) Greenwich sidereal time: 1: 0:10.74 (17:30: 0 UT) Sun's RA and DEC: 19h 38.8m -21d 30.0 =========================================================== First observations Observation listing from file t2025.skd for experiment T2025 Source Start DURATIONS name yyddd-hhmmss Ft Gc Hh Nt On Sv Tc Ur 0059+581 04013-173000| 570 196 60 189 62 570| 1749+096 04013-174353| 521 521 | CTA26 04013-174500| 780 85 277 73 780| 0003-066 04013-174834| 60 60 | 2134+00 04013-175100| 275 275 | End of listing. =========================================================== Last observations Source Start DURATIONS name yyddd-hhmmss Ft Gc Hh Nt On Sv Tc Ur 1606+106 04014-165714| 780 780 | 0454-234 04014-165933| 211 79 211| 2134+00 04014-170404| 190 190 | 0727-115 04014-170546| 83 83| 0119+115 04014-170919| 263 263| 0552+398 04014-171707| 293 293 60 97 76| End of listing. =========================================================== Average number of obs. per baseline per source (normalized by up-time) = 1.6 Min = .0 Max = 21.5 (Baseline Nt-Sv on 0528+134) RMS = 3.7 Total time: 1432 minutes ( 23.9 hours). Key: Ft=FORTLEZA Gc=GILCREEK Hh=HARTRAO Nt=NOTO On=ONSALA60 Sv=SVETLOE Tc=TIGO Ur=URUMQI Ft Gc Hh Nt On Sv Tc Ur Avg % obs. time: 41 55 47 50 36 35 23 53 42 % cal. time: 0 1 1 2 1 2 0 2 1 % slew time: 13 11 23 25 10 29 1 18 16 % idle time: 43 31 27 21 52 32 75 25 38 total # scans: 74 165 105 199 122 204 33 186 136 # scans/hour : 3 6 4 8 5 8 1 7 5.7 Avg scan (sec): 483 286 389 218 256 149 600 246 328 Total GBytes: 281 372 321 342 246 239 156 361 289 # of tapes : 2.5 .8 .8 .8 .5 2.0 .4 .8 tape change times (hhmm): 0133 0000 0000 0000 0000 0322 0000 0000 1136 0000 0000 0000 0000 0000 0000 0000 # OF OBSERVATIONS BY BASELINE | Ft Gc Hh Nt On Sv Tc Ur StnTotal ---------------------------------------------- Ft| 74 16 36 28 25 18 28 7 158 Gc| 165 3 40 73 87 6 107 332 Hh| 105 80 42 40 7 42 250 Nt| 199 86 150 3 94 481 On| 122 96 2 71 395 Sv| 204 1 120 512 Tc| 33 0 47 Ur| 186 441 Number of 2-station scans: 202 Number of 3-station scans: 71 Number of 4-station scans: 38 Number of 5-station scans: 53 Number of 6-station scans: 9 Number of 7-station scans: 0 Number of 8-station scans: 0 Total # of scans, observations: 373 1308 =========================================================== Recording mode Name Code EUR-SX SX Recording mode setup for: FORTLEZA SVETLOE 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= 85.0 MHz rms spanned bw= 33.0 MHz Effective number of channels recorded per sub-pass X S Total 8.000 6.000 14.000 Recording mode setup for: GILCREEK HARTRAO NOTO ONSALA60 TIGOCONC URUMQI 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= 85.0 MHz rms spanned bw= 33.0 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 Gc GILCREEK 17400feet (Thin ) 56250. (High) 12 Hh HARTRAO 17400feet (Thin ) 56250. (High) 12 Nt NOTO 17400feet (Thin ) 56250. (High) 12 On ONSALA60 17400feet (Thin ) 56250. (High) 12 Sv SVETLOE 8700feet (Thick) 33333. (Low ) 12 Tc TIGOCONC 17400feet (Thin ) 56250. (High) 12 Ur URUMQI 17400feet (Thin ) 56250. (High) 12 =========================================================== SNR Targets Minimum SNR by baseline for multi-baseline scans X-band (margin 5) S-band (margin 5) Ft Gc Hh Nt On Sv Tc Ft Gc Hh Nt On Sv Tc Gc 25 Gc 25 Hh 25 25 Hh 25 25 Nt 25 25 25 Nt 25 25 25 On 25 25 25 25 On 25 25 25 25 Sv 25 25 25 25 25 Sv 25 25 25 25 25 Tc 20 20 20 20 20 20 Tc 15 15 15 15 15 15 Ur 25 25 25 25 25 25 20 Ur 25 25 25 25 25 25 15