IVS-T2022 (International VLBI Service - Terrestical reference frame observations) 2003 Oct. 14/15 doy 287/288 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. THIS SCHEDULE HAS NO EARLY TAPE START !! ------------------------------------- Parameter values for experiment T2022 Experiment description: IVS-T2022 Scheduler: Mueskens Correlator: BONN Nominal start: 2003-287-17:30:00 Nominal end: 2003-288-17:30:01 Current yyyyddd: 2003287 (2003.79) ( 12927 MJD, TUES 14OCT.) Greenwich sidereal time: 19: 1:24.20 (17:30: 0 UT) Sun's RA and DEC: 13h 17.4m -8d 10.7 =========================================================== First observations Observation listing from file t2022.skd for experiment T2022 Source Start DURATIONS name yyddd-hhmmss 15 Ft Hh Ho Kb Oh Sh Sv 0003-066 03287-173000| 111 111| 0537-441 03287-173001| 60 60 | 1741-038 03287-173440| 61 61 60| 0727-115 03287-173500| 60 60 60 60 | 1124-186 03287-173914| 128 128 | End of listing. =========================================================== Last observations Source Start DURATIONS name yyddd-hhmmss 15 Ft Hh Ho Kb Oh Sh Sv 0454-234 03288-170644| 108 60 108 | 1124-186 03288-170955| 293 293 | 0537-441 03288-171007| 60 60 60 | 0119+115 03288-171322| 60 60| CTA26 03288-171558| 92 60 92 | 0003-066 03288-171832| 110 110| End of listing. =========================================================== SKED Summary from file /geo/vlbi/schedules/t2022.skd for experiment T2022 (all scans with at least one subnet station) Average number of obs. per baseline per source (normalized by up-time) = 1.6 Min = .0 Max = 24.2 (Baseline Ho-Kb on 1741-038) RMS = 3.7 Total time: 1430 minutes ( 23.8 hours). Key: 15=DSS15 Ft=FORTLEZA Hh=HARTRAO Ho=HOBART26 Kb=KASHIM34 Oh=OHIGGINS Sh=SESHAN25 Sv=SVETLOE 15 Ft Hh Ho Kb Oh Sh Sv Avg % obs. time: 45 31 36 49 35 23 30 38 36 % cal. time: 3 1 1 2 3 0 1 2 2 % slew time: 33 21 25 30 30 5 33 32 26 % idle time: 18 44 36 17 30 69 33 25 34 total # scans: 275 139 120 177 272 55 163 218 177 # scans/hour : 11 5 5 7 11 2 6 9 7.4 Avg scan (sec): 140 197 260 242 113 369 162 152 204 Total GBytes: 304 215 245 337 242 159 208 262 246 # of tapes : .7 1.8 .5 .8 1.9 .4 .5 2.1 tape change times (hhmm): 0000 0637 0000 0000 0601 0000 0000 0434 0000 0000 0000 0000 0000 0000 0000 1613 # OF OBSERVATIONS BY BASELINE | 15 Ft Hh Ho Kb Oh Sh Sv StnTotal ---------------------------------------------- 15|275 97 4 46 118 18 63 92 438 Ft| 139 44 1 1 17 0 41 201 Hh| 120 38 14 16 20 60 196 Ho| 177 97 31 67 6 286 Kb| 272 1 147 113 491 Oh| 55 0 3 86 Sh| 163 72 369 Sv| 218 387 Number of 2-station scans: 340 Number of 3-station scans: 151 Number of 4-station scans: 69 Number of 5-station scans: 2 Number of 6-station scans: 0 Number of 7-station scans: 0 Number of 8-station scans: 0 Total # of scans, observations: 562 1227 =========================================================== Recording mode Name Code EUR-SX SX Recording mode setup for: DSS15 HARTRAO HOBART26 OHIGGINS SESHAN25 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 Recording mode setup for: FORTLEZA KASHIM34 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 =========================================================== Tape types ID Station Tape length Density Passes 15 DSS15 17400feet (Thin ) 56250. (High) 12 Ft FORTLEZA 8700feet (Thick) 33333. (Low ) 12 Hh HARTRAO 17400feet (Thin ) 56250. (High) 12 Ho HOBART26 17400feet (Thin ) 56250. (High) 12 Kb KASHIM34 8700feet (Thick) 33333. (Low ) 12 Oh OHIGGINS 17400feet (Thin ) 56250. (High) 12 Sh SESHAN25 17400feet (Thin ) 56250. (High) 12 Sv SVETLOE 8700feet (Thick) 33333. (Low ) 12 =========================================================== SNR Targets Minimum SNR by baseline for multi-baseline scans X-band (margin 0) S-band (margin 0) 15 Ft Hh Ho Kb Oh Sh 15 Ft Hh Ho Kb Oh Sh Ft 25 Ft 25 Hh 25 25 Hh 25 25 Ho 25 25 25 Ho 25 25 25 Kb 25 25 25 25 Kb 25 25 25 25 Oh 15 15 15 15 15 Oh 15 15 15 15 15 Sh 25 25 25 25 25 15 Sh 25 25 25 25 25 15 Sv 25 25 25 25 25 25 25 Sv 25 25 25 25 25 15 25