CORE-1009 (Continuous Observations of the Rotation of the Earth-1009) 2001 February 5 Notes prepared by Cynthia Thomas and Nancy Vandenberg,NVI/GSFC Session code: C1009 Schedule file: feb01/c1009.skd on CDDISA Nominal Start: 17:30 U.T. on February 05 (day 036) first observation at 17:30 U.T. on 0048-097 for HH-WF first observation at 17:30 U.T. on 4C39.25 for GC-MA-SH-TS Nominal Stop: 17:30 U.T. on February 06 (day 037) last observation at 17:02 U.T. on 0552+398 for HH last observation at 17:15 U.T. on 0955+476 for SH last observation at 17:17 U.T. on 1739+522 for GC-WF last observation at 17:23 U.T. on 0823+033 for MA-TS Correlator: Haystack Observing Mode: 2F (with barrel roll, see details below) 1 letter 2 letter Station Code Code # of tapes # of obs Occupation Code Fairbanks A GC 1 (TT) 401 40476601 HartRAO J HH 1 (TT) 171 72326201 Matera I MA 2 (TT) 350 72435701 Seshab C SH 1 (TT) 272 72336101 Tsukuba T TS 1 (TT) 415 73452301 Westford E WF 2 (TT) 336 72097301 Purpose ======= The CORE-1 sessions provide a monthly 72 hour continuous data set (CORE-1 + NEOS + CORE-3). These sessions will help reach CORE's goal of continuous data. The CORE-1 sessions will be recorded in a Mark 4 mode which requires that the participating stations have Mark 4 capability. Observing Mode ============== This is the second CORE series that uses a "Mark 4" style observing mode. The mode for CORE-1 uses fan-out and records on all 32 tracks to achieve a data rate of 128 Mb/s, more than twice that of the standard geodetic Mode C which is 56 Mb/s. CORE Mode "2F" (twice the standard mode C, fanned out) ----------------------------------------------------------------- Number of frequencies 14 (standard wide-band frequency sequence modified to avoid RFI at Matera) Number of channels 16 (14 USB + 2 LSB) Channel bandwidth 4.0 MHz Sample rate 8 Mb/s Bits per sample 1 Total data rate 128 Mb/s Data rate on tape 4 Mb/s/track Fan-out 1:2 Tape speed 80 ips Tracks per pass 32 Passes per tape 14 Barrel roll yes (*) Track frame format Mark4 and VLBA (*) The 16 recorded channels are comprised of the standard 14-channel USB frequency sequence plus the LSB channels of the first and last frequencies at X-band. The two outer X-band LSB channels give extra sensitivity. They also slightly narrow the peak of the delay resolution function, resulting in better group delay precision. (*) Fairbanks, which has a VLBA backend, will use barrel roll during this session and record in VLBA (non-data replacement) format. Stations with Mark 4 formatters cannot barrel roll. Schedule ======== This schedule was made by C. Thomas using sked. Schedule setup parameters: Early start 10 sec Minimum scan length 30 sec Maximum scan length 600 sec Minimum SNR 20 at X-band 15 at S-band Automatic scheduling setup: optimize for uniform sky coverage at all stations, maximize the number of observations, minimize slewing time, minimize time between scans, consider the top 50% of ranked scans for selection, consider the last 1 hour of scans for sky coverage calculations, minimum 40 min between scans on the same source. The characteristics of the generated schedule are listed below. These will vary slightly for each schedule that is generated. Schedule characteristics: Average scan length 90 seconds Average SNR 52.1 at X-band 37.4 at S-band Number of observations 1968 observations Average scans per station 324 scans Flux Information ================ Program snranal compares the measured performance of a session with respect to the predicted. The program calculates an empirical flux density for each source. In order to account for changes in the flux catalog since the last update based on source modeling, the fluxes in the flux catalog for the sources in the current source catalog were adjused using the following databases: Date Session ==== ========= 00OCT03 NEOS-A388 00OCT10 NEOS-A389 00OCT24 NEOS-A391 00OCT31 NEOS-A392 00NOV14 NEOS-A394 00NOV28 NEOS-A396 00DEC12 NEOS-A398 Procedures ========== Please generate the procedures for this session using drudg. SKED Summary from file ./c1009.skd for experiment C1009 (all scans with at least one subnet station) SOURCE |0 6 12 18 | #SCANS #OBS #Obs/bl 0003-066Ixx x xx x xx x xx xx x x x x x x x x I 21 48 7.8 0048-097I x x x x I 4 13 1.9 0059+581I x x x x x x x x x x x x x x x x x xI 18 105 9.6 0104-408I x x xx x x x x x x x x I 12 14 3.7 0106+013Ix xx x x x x x x x x xx I 13 25 3.7 0119+115I x x xx x x x x x x x x x x xx x x x I 19 62 8.2 0119+041I I 0 0 .0 0229+131I x x x x I 4 8 1.0 0235+164I x x x x x x x x x x x x x x x x x I 17 63 7.8 CTA26 Ix x xx x x x x x x x x x x x x x x x x x x I 22 38 5.8 0402-362I x x x x x x I 6 6 1.7 0454-234I x x x x x xx x x x x I 11 13 3.1 0458-020I x x x xx x x x x x x x x x x x I 16 35 5.4 0528+134Ix x xx x xx xx x x x x x x x x x xI 19 45 5.4 0552+398Ix x x xx x x x xx x x x x x x xx x x x x x I 23 138 14.4 0556+238Ix x x x x x xx x x x x x I 13 15 1.4 0718+793I x x x x x x x x x x x x x x x x x x xI 19 21 1.9 0727-115Ix x x xx x x x x x xx x x I 14 26 6.2 0749+540I x x x x x x x x x x x x x x I 14 86 8.4 0804+499I x x x xI 4 18 1.8 0805+410I x x x x x x x x x x x x x x x I 15 52 4.2 0823+033I x x x x x xx x x x x x x x xxx x x I 19 35 4.9 OJ287 I x x x x x x xx x x x x x x I 14 24 3.0 0919-260I x x x xx I 5 5 1.4 0920-397I x x x I 3 3 1.1 4C39.25 I x x x x x x x x x x x x x xx x x xI 18 109 11.5 OK290 I x xx x x x x x x x x x x x I 14 14 1.3 0955+476Ix x x x x x x x x x I 10 59 6.3 1034-293Ix x xx x x x x x x x I 11 11 2.7 1044+719I x x x x x x x x x I 9 33 3.0 1053+815I I 0 0 .0 1124-186I x x xx x x x x x x x x x x xI 15 32 7.3 1128+385I x x x x x x x x x x x x x x x x I 16 72 6.4 1144-379I x x x x x x x x x xI 10 10 2.4 1219+044Ix x x x x x x x x x x x x x I 14 22 3.1 1255-316I x x x x x x x x x I 9 9 2.2 1300+580I I 0 0 .0 1313-333I I 0 0 .0 1334-127Ix x x x x x x xx x x x x x x x x I 17 30 5.9 1351-018I x x x x xx x x x xx x x x xx x x I 18 30 4.6 1357+769I x x x x x x x x x x x x x x xx x x x x xI 21 210 19.1 1424-418I x x x x x x xI 7 7 1.8 1451-375I x x x x I 4 4 1.2 1606+106Ix x x x x x x x x x x x x xx x x x x x x I 21 55 7.0 1622-253I x x x x x xx x xx x x I 12 12 3.0 NRAO512 I x x x x x x x I 7 27 2.2 1726+455I x x x x x x x x I 8 27 2.8 1739+522I x x x x x xx x x x x xI 12 60 6.0 1741-038Ix x x x x xx x x x x x x x xx x x x I 19 29 4.7 1749+096I x x x x x x x x xx x xx x x x xx x x x x I 22 62 8.4 1908-201Ix x x x x x x x x x x I 11 11 2.8 1921-293I x x x x x x x x x I 9 9 2.3 1954-388I x x x x x x xI 7 7 2.0 1958-179Ix x x x x x x x I 8 12 2.7 2121+053I x x x x x x x x xx x x I 12 24 3.2 2128-123I I 0 0 .0 2134+00 Ix x x x x I 5 5 .7 2145+067I x x x x x x x x x x xI 11 22 3.0 2234+282Ix x x x x x x x x x x x x x xx x I 17 47 5.0 2255-282I x xx x x x x x x I 9 9 2.5 Total scans, obs: 708 1968 Average number of obs. per baseline per source (normalized by up-time) = 4.3 Min = .0 Max = 28.6 (Baseline Gc-Ts on 0727-115) RMS = 5.7 Total time: 1433 minutes ( 23.9 hours). Key: Gc=GILCREEK Hh=HARTRAO Ma=MATERA Sh=SESHAN25 Ts=TSUKUB32 Wf=WESTFORD Gc Hh Ma Sh Ts Wf Avg % obs. time: 34 24 43 23 30 42 33 % cal. time: 4 1 4 3 4 3 3 % slew time: 27 32 25 45 19 17 28 % idle time: 32 41 27 27 44 35 34 # of tapes : 1.0 .6 1.2 .6 .9 1.1 total # scans: 401 171 350 272 415 336 324 # scans/hour : 16 7 14 11 17 14 13.5 Avg scan (sec): 74 121 106 74 63 108 90 # OF OBSERVATIONS BY BASELINE | Gc Hh Ma Sh Ts Wf StnTotal -------------------------------------- Gc|401 15 159 136 274 258 842 Hh| 171 152 43 30 53 293 Ma| 350 74 137 201 723 Sh| 272 256 46 555 Ts| 415 134 831 Wf| 336 692 Number of 2-station scans: 346 Number of 3-station scans: 229 Number of 4-station scans: 100 Number of 5-station scans: 32 Number of 6-station scans: 1 Total # of scans, observations: 708 1968 Average baseline components for all observations Average XY = 5777. Average XZ = 4706. Average YZ = 4798. Average length = 6533.