CORE-3010 (Continuous Observations of the Rotation of the Earth-3010) 2001 February 21 Notes prepared by Nancy Vandenberg and Cynthia Thomas,NVI/GSFC Schedule name: feb01/c3010.skd on CDDISA Nominal Start: 18:30 U.T. on February 21 (day 052) first observation at 18:30 U.T. on 1357+769 Nominal Stop: 18:30 U.T. on February 22 (day 0535353) last observation at 18:10 U.T. on NRAO512 for KK-WF last observation at 18:15 U.T. on 4C39.25 for GC-MA-NY-WZ Observing Mode: 2F (with barrel roll, see details below) Correlator: Bonn 1 letter 2 letter Station Code Code # of tapes # of obs Occupation Code Fairbanks A Gc 1 (TT) 367 40476601 Kokee K Kk 2 (TT) 320 72983001 Matera I Ma 2 (TT) 360 72435701 Ny Alesund N Ny 1 (TT) 352 73313301 Westford E Wf 2 (TT) 336 72097301 Wettzell V Wz 2 (TT) 385 72247801 Purpose ======= The CORE-3 sessions marked the start of the regular CORE oberving program. These sessions will provide a bi-weekly 48-hour continuous data set from January through July (NEOS + CORE-3) and a weekly 48-hour continuous data set from July through December. The CORE-3 sessions will be recorded in a Mark 4 mode which requires that the participating stations have Mark 4 capability. Observing Mode ============== This is the first CORE series that uses a "Mark 4" style observing mode. The mode for CORE-3 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. *The stations with VLBA backends, Fairbanks and Kokee, 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, margin of 5 15 at S-band, margin of 3 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 50 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. The characteristics also will change when Matera and Ny Alesund are used in the network instead of Medicina and Onsala. Schedule characteristics: Average scan length 95 seconds Average SNR 48.5 at X-band 31.4 at S-band Number of observations 3267 observations Average scans per station 354 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 Simulation Results ================== Simulated data from this schedule was used in a global solution to estimate the formal errors. The table below lists the formal errors for Earth orientation parameters. These results meet the simulation goals for the CORE-3 network. Also shown in the table are the maximum correlations between the Earth orientation parameters and other parameters. Simulation for experiment $01FEB21ZZ -------------------------------------------------------------------| | | | Maximum | Correlating | | EOP | Formal | Correlation | Parameter | | Parameters | Errors | | | |------------+----------------+-------------+----------------------| | | | | | | X-Wobble | 36.4 mas | 0.23 | KOKEE Z COMPONENT | | Y-Wobble | 29.7 mas | 0.16 | WETTZELL Z COMPONENT | | UT1-TAI | 1.5 musec | 0.17 | KOKEE Y COMPONENT | | UT1-Rate | 2.3 musec/d | 0.02 | WETTZELL Z COMPONENT | |------------|----------------|-------------|----------------------| Procedures ========== Please generate the procedures for this session using drudg. SKED Summary from file ./c3010.skd for experiment C3010 (all scans with at least one subnet station) SOURCE |0 6 12 18 | #SCANS #OBS #Obs/bl 0003-066Ix x x x x x xx x x x x x x x x x I 17 31 6.1 0048-097Ix x x x I 4 4 .9 0059+581I x x x x x x x x x x x x x xI 14 185 13.6 0106+013I x x x x x x x x x x x x x I 13 40 6.1 0119+115Ix x x x x x x x x x x x x x x x x x x x x I 21 93 11.0 0119+041I I 0 0 .0 0229+131I x x x x x I 5 23 2.6 0235+164Ix x x x x x x x x x x x x x x x x x I 18 100 10.7 CTA26 Ix x x x x x x x x x x x x x x x I 16 43 11.1 0454-234I x x x x xx x x I 8 8 2.8 0458-020Ix x x x x x x x x x x x x I 13 27 5.4 0528+134Ix x x x x x x x x x x x x x x x x x x x I 20 86 9.8 0552+398I x x x x x x x x x x x x x x xx x x x x xxI 22 199 16.9 0556+238I I 0 0 .0 0718+793I x x x x x x x x x x I 10 18 1.2 0727-115Ix x x x x x x x x x x x x x x I 15 21 5.6 0749+540I x x x x x x x x x x x xI 12 145 10.8 0804+499I x x x x x x x I 7 85 6.7 0805+410I x x x x x x x x x x xx x x x xI 16 147 12.3 0823+033Ix x x x x x xx x xx x x x x x x x x I 19 59 8.6 OJ287 Ix x x x x x xx x x x x x x I 14 65 6.7 0919-260I x x x x I 4 4 1.6 4C39.25 I x x x x x x x x x x x x x x I 14 119 10.1 OK290 I x x x x x x x x x x x I 11 21 2.1 0955+476I x x x x x x x x x x x x x x x xI 16 171 13.7 1044+719I x x x x x x x x x x x x I 12 130 9.0 1053+815I x I 1 15 1.0 1124-186I x x x x x xx x x x xI 11 15 5.0 1128+385Ix x x x x x x x x x x x x x x x x x x x I 20 180 15.6 1219+044Ix x x x x x x x x x x xx x x x I 16 44 6.2 1255-316Ix x x x x I 5 5 2.2 1300+580I x x x x x x x x x x I 10 135 10.0 1313-333I I 0 0 .0 1334-127I x x x x x x x x x x x x x x xI 15 21 5.6 1351-018Ix x x x x x x x x x x x x x x x I 16 37 5.2 1357+769I x x x x x x x x x x x x x x x x x x x x xI 21 315 21.0 1606+106I x x x x x x x x x x x x x x x x x x x x xI 21 87 10.5 1622-253I x x x x x x x x I 8 10 3.8 NRAO512 Ix x x x x x x x x x x x I 12 88 7.3 1726+455I x x x x x x x x x I 9 86 6.9 1739+522I x x x x x x x x x I 9 96 7.2 1741-038I x x x xx x x x x x x x x x x x x I 17 38 12.6 1749+096I x x x xx x x x x x x x x x x x x x x x x I 21 87 10.7 1908-201I x x xx x x x x x x I 10 14 4.8 1921-293I x x x x I 4 4 1.7 1958-179I x x x x I 4 6 1.9 2121+053Ix x x x x x x x x x x I 11 33 4.5 2128-123I I 0 0 .0 2134+00 I x x x x x x I 6 6 .9 2145+067I x x x x x x x x x x x x x I 13 47 6.3 2234+282I x x x xx x x x x x x xI 12 69 6.5 2255-282I x x x x x I 5 5 2.1 Total scans, obs: 598 3267 Average number of obs. per baseline per source (normalized by up-time) = 7.1 Min = .0 Max = 70.2 (Baseline Ny-Wz on 1741-038) RMS = 7.4 Total time: 1426 minutes ( 23.8 hours). Key: Gc=GILCREEK Kk=KOKEE Ma=MATERA Ny=NYALES20 Wf=WESTFORD Wz=WETTZELL Gc Kk Ma Ny Wf Wz Avg % obs. time: 28 46 45 33 44 38 39 % cal. time: 4 3 4 4 4 4 4 % slew time: 24 14 24 20 16 13 19 % idle time: 43 34 25 41 34 43 37 # of tapes : .8 1.3 1.3 1.0 1.2 1.1 total # scans: 367 315 361 354 344 386 354 # scans/hour : 15 13 15 14 14 16 14.8 Avg scan (sec): 65 126 107 81 111 85 95 # OF OBSERVATIONS BY BASELINE | Gc Kk Ma Ny Wf Wz StnTotal -------------------------------------- Gc|367 287 158 251 240 186 1122 Kk| 315 81 173 204 108 853 Ma| 361 260 208 358 1065 Ny| 354 238 287 1209 Wf| 344 228 1118 Wz| 386 1167 Number of 2-station scans: 171 Number of 3-station scans: 157 Number of 4-station scans: 105 Number of 5-station scans: 96 Number of 6-station scans: 69 Total # of scans, observations: 598 3267 Average baseline components for all observations Average XY = 4946. Average XZ = 4367. Average YZ = 3180. Average length = 5312.