IVS-T2015 (International VLBI Service - Terrestical reference frame observations) 2003 Mar. 18/19 Geodetic Institute of the University of Bonn, Germany Correlator: TBD 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 T2015 Experiment description: IVS-T2015 Scheduler: Mueskens Correlator: TBD Nominal start: 2003-077-17:30:01 Nominal end: 2003-078-17:30:01 Current yyyyddd: 2003077 (2003.21) ( 12717 MJD, TUES 18MAR.) Greenwich sidereal time: 5:13:28.57 (17:30: 1 UT) Sun's RA and DEC: 23h 51.6m 0d 54.7 =========================================================== First observations Source Start DURATIONS name yyddd-hhmmss Sm Ma Ny Gg Sv Ts Ur Wf Wz OJ287 03077-173001| 218 168 153 71 150 218 141| 0955+476 03077-173602| 249 201 198 93 72 249 176| 1357+769 03077-174346| 494 371 355 171 126 450 494 329| 2134+00 03077-175406| 61 61 | 4C39.25 03077-175423| 60 60 60 60 60 60 60| End of listing. =========================================================== Last observations Source Start DURATIONS name yyddd-hhmmss Sm Ma Ny Gg Sv Ts Ur Wf Wz 1351-018 03078-170747| 148 148 | 0106+013 03078-171107| 106 106 79| 1606+106 03078-171113| 60 60 | 2234+282 03078-171350| 86 121 121| 1124-186 03078-171356| 181 181 | 0454-234 03078-171650| 60 60 60| End of listing. =========================================================== Average number of obs. per baseline per source (normalized by up-time) = 3.6 Min = .0 Max = 70.2 (Baseline Ny-Sv on 1741-038) RMS = 6.7 Total time: 1427 minutes ( 23.8 hours). Key: Sm=CRIMEA Ma=MATERA Ny=NYALES20 Gg=ORION_5M Sv=SVETLOE Ts=TSUKUB32 Ur=URUMQI Wf=WESTFORD Wz=WETTZELL Sm Ma Ny Gg Sv Ts Ur Wf Wz Avg % obs. time: 39 41 47 25 28 41 50 58 48 42 % cal. time: 2 2 2 0 2 3 3 1 2 2 % slew time: 26 17 13 1 33 12 23 7 8 15 % idle time: 31 37 36 72 35 43 23 32 40 39 total # scans: 188 212 225 49 221 274 269 164 243 205 # scans/hour : 7 8 9 2 9 11 11 6 10 8.5 Avg scan (sec): 181 169 182 450 111 128 159 306 169 206 Total GBytes: 269 282 322 173 194 276 337 395 323 285 # of tapes : 2.2 .6 .7 .4 1.5 .6 .7 .9 .7 tape change times (hhmm): 0513 0000 0000 0000 0858 0000 0000 0000 0000 1533 0000 0000 0000 0000 0000 0000 0000 0000 # OF OBSERVATIONS BY BASELINE | Sm Ma Ny Gg Sv Ts Ur Wf Wz StnTotal -------------------------------------------------- Sm|188 170 121 0 142 101 146 47 158 885 Ma| 212 142 5 160 94 132 81 197 981 Ny| 225 5 189 138 131 96 177 999 Gg| 49 5 2 0 48 5 70 Sv| 221 128 140 77 199 1040 Ts| 274 224 55 108 850 Ur| 269 44 130 947 Wf| 164 87 535 Wz| 243 1061 Number of 2-station scans: 202 Number of 3-station scans: 68 Number of 4-station scans: 34 Number of 5-station scans: 37 Number of 6-station scans: 44 Number of 7-station scans: 68 Number of 8-station scans: 22 Number of 9-station scans: 0 Total # of scans, observations: 475 3684 =========================================================== Recording mode Name Code EUR2-SX SX Recording mode setup for: CRIMEA 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= 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: MATERA NYALES20 GGAO7108 TSUKUB32 URUMQI WESTFORD 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 Sm CRIMEA 8700feet (Thick) 33333. (Low ) 12 Ma MATERA 17400feet (Thin ) 56250. (High) 12 Ny NYALES20 17400feet (Thin ) 56250. (High) 12 Gg GGAO7108 17400feet (Thin ) 56250. (High) 12 Sv SVETLOE 8700feet (Thick) 33333. (Low ) 12 Ts TSUKUB32 17400feet (Thin ) 56250. (High) 12 Ur URUMQI 17400feet (Thin ) 56250. (High) 12 Wf WESTFORD 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) Sm Ma Ny Gg Sv Ts Ur Wf Sm Ma Ny Gg Sv Ts Ur Wf Ma 25 Ma 25 Ny 25 25 Ny 25 25 Gg 20 20 20 Gg 20 20 20 Sv 25 25 25 20 Sv 25 25 25 20 Ts 25 25 25 20 25 Ts 25 25 25 20 25 Ur 25 25 25 20 25 25 Ur 25 25 25 20 25 25 Wf 25 25 25 20 25 25 25 Wf 25 25 25 20 25 25 25 Wz 25 25 25 20 25 25 25 25 Wz 25 25 25 20 25 25 25 25