************************************************************************* * NEW S-BAND FREQUENCY SEQUENCE!!! MAKE PROCEDURES WITH DRUDG AND CHECK. ************************************************************************* CORE-1010 (Continuous Observations of the Rotation of the Earth-1010) 2001 March 5 Notes prepared by Cynthia Thomas and Nancy Vandenberg,NVI/GSFC Session code: C1010 Schedule file: mar01/c1010.skd on CDDISA Nominal Start: 17:30 U.T. on March 05 (day 064) first observation at 17:30 U.T. on 0235+164 for HH-MA-WF first observation at 17:30 U.T. on 1351-018 for GC-SH-TS Nominal Stop: 17:30 U.T. on March 06 (day 065) last observation at 17:15 U.T. on 0552+398 for HH-MA-SH-WF last observation at 17:18 U.T. on 2234+282 for GC-TS Correlator: Haystack Observing Mode: 4F (with barrel roll, see details below) 1 letter 2 letter Station Code Code # of tapes # of obs Occupation Code Fairbanks A GC 2 (TT) 412 40476601 HartRAO J HH 2 (TT) 185 72326201 Matera I MA 3 (TT) 376 72435701 Seshan C SH 2 (TT) 287 72336101 Tsukuba T TS 2 (TT) 428 73452301 Westford E WF 3 (TT) 358 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 "4F" (four times the standard mode C, fanned out) ----------------------------------------------------------------- Number of frequencies 14 Frequency sequence X-band standard wide-band frequency sequence modified to avoid RFI at Matera S-band NEW sequence to avoid overlapping channels at the high end Number of channels 16 (14 USB + 2 LSB) (**) Channel bandwidth 8.0 MHz Sample rate 16 Mb/s Bits per sample 1 Total data rate 256 Mb/s Data rate on tape 16 Mb/s/track Fan-out 1:2 Tape speed 160 ips Tracks per pass 32 Passes per tape 14 Barrel roll yes for Fairbanks (*) Track frame format Mark4 and VLBA (*) The 16 recorded channels are comprised of a 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. This session uses a NEW S-BAND FREQUENCY SEQUENCE, generated by Dave Shaffer. Because of the 8 MHz channel bandwidth, the standard S-band sequence had some overlapping channels. This sequence avoids the overlap and tries to avoid the direct-broadcast satellite band of 2320-2345 MHz. (**) Tsukuba cannot record LSB channels at this channel bandwidth using their K4 video converter. They will record the 14 USB channels only. (*) 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 74 seconds Average SNR 52.2 at X-band 38.8 at S-band Number of observations 2118 observations Average scans per station 341 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 ==== ========= 00SEP05 NEOS-A384 00SEP12 NEOS-A385 00SEP19 NEOS-A386 00SEP26 NEOS-A387 00OCT03 NEOS-A388 00OCT24 NEOS-A391 00OCT31 NEOS-A392 00NOV14 NEOS-A394 00NOV28 NEOS-A396 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 $01FEB05ZZ -------------------------------------------------------------------| | | | Maximum | Correlating | | EOP | Formal | Correlation | Parameter | | Parameters | Errors | | | |------------+----------------+-------------+----------------------| | | | | | | X-Wobble | 68.7 mas | 0.01 | WESTFORD Z COMPONENT | | Y-Wobble | 52.8 mas | 0.21 | SESHAN25 Z COMPONENT | | UT1-TAI | 2.1 musec | 0.03 | TSUKUB32 Z COMPONENT | | UT1-Rate | 2.1 musec/d | 0.03 | TSUKUB32 Z COMPONENT | |------------|----------------|-------------|----------------------| Procedures ========== Please generate the procedures for this session using drudg. SKED Summary from file ./c1010.skd for experiment C1010 (all scans with at least one subnet station) SOURCE |0 6 12 18 | #SCANS #OBS #Obs/bl 0003-066I x I 1 1 .2 0048-097Ixx x xx x x x x x x x x x xx x xx I 19 42 9.2 0059+581I x x x x x x x x x x x x x xx x x x x xI 20 117 10.8 0104-408I x x x x x x x x x x I 10 12 3.1 0106+013I x x xx x x x x x x x x x x xx xI 17 40 5.8 0119+115Ix x x x x x x x x xx x x x x x x x xx I 20 59 7.6 0119+041I x I 1 1 .2 0229+131I x xx x x I 5 11 1.3 0235+164I x x x x x x x x x x xx x x x xI 16 56 7.0 CTA26 I x xx x x x x x x x x xx x xxI 16 16 2.5 0402-362I x x x x x x x I 7 7 1.9 0454-234I x x x xx x x x x x x x I 12 14 3.3 0458-020Ix x xx x x xx x x x x x xx x x x I 18 38 5.9 0528+134Ix x x x x x x x x x x x x x x x x x xx x xx I 23 53 6.6 0552+398Ix x x xx x x x x x x x x x x x xx x x x x x I 23 138 14.4 0556+238I x x x I 3 7 .7 0718+793I x x x x x x x x x x x x x x x xI 16 22 2.0 0727-115Ix x x x x x x x xxx x x x x x I 16 32 7.1 0749+540I x x x x xx x x x x x x x x I 14 94 9.3 0804+499Ix x x x x x x x I 8 43 4.5 0805+410I x x x x x x x x x x x x xI 13 51 4.4 0823+033Ix x x x x x xx x x x x x x x x x x x I 19 35 5.0 OJ287 I x x x x x xx xx x x x x x xx I 16 32 3.8 0919-260I x x x x x I 5 5 1.3 0920-397I x x x x I 4 4 1.4 4C39.25 I x x x x x x x x x x x x x x x xI 16 90 9.5 OK290 I x x x x x x x x x x x x I 12 16 1.5 0955+476I x x x x x x x x x x x xI 12 73 7.9 1034-293I x x x x x x x x xI 9 9 2.1 1044+719Ix x x x x x x x x x I 10 63 5.7 1053+815I x x x x I 4 24 2.2 1124-186I x x xx x x x xx x x x x x xI 15 32 7.2 1128+385I x x x x x x x x x x x x I 12 42 3.5 1144-379Ix x x x x x x x x x I 10 10 2.4 1219+044I x x xx x xx x xx x x x xx xI 16 28 3.9 1255-316Ix x x x x x x x x I 9 9 2.1 1300+580I x x x x x x x x x x I 10 54 5.0 1313-333I I 0 0 .0 1334-127I x x xx x x x x x x x x x x x I 15 30 7.4 1351-018I x xx x x x x x x x x x xx I 14 24 3.8 1357+769I x x x x x x x x x x x x x x x x x x x xI 20 200 18.2 1424-418I x x x x x x I 6 8 2.0 1451-375I x x x x I 4 4 1.1 1606+106I x x x x x xx x x x xx x x x xx x x I 19 42 5.4 1622-253I x xx x x x x x x x x x x xI 14 14 3.3 NRAO512 I x x x x x x x x x x x x x x x x I 16 57 4.6 1726+455I x x x x x x x x x I 9 42 4.5 1739+522I x x x x x x I 6 27 2.7 1741-038I x xx x x x x xx x xx x x x x x x I 18 28 4.5 1749+096I x x x xx xx xx x x x xx x xx xx x x xx xxI 25 74 9.9 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 x xI 11 11 2.8 1954-388I x x x x x x xI 7 7 2.0 1958-179I x x x x x x x x x x I 10 18 4.1 2121+053I x x xx x x x x x x xx x x x I 15 31 4.3 2128-123Ix x xx x x x x x x x x x I 13 13 3.7 2134+00 I x x x x I 4 4 .6 2145+067Ix x x x x x x x x x x x I 12 27 3.7 2234+282Ix x x x x x x x x x xx x xx x x x I 18 57 6.1 2255-282I x x x x x x x x xI 9 9 2.5 Total scans, obs: 733 2118 Average number of obs. per baseline per source (normalized by up-time) = 4.6 Min = .0 Max = 30.9 (Baseline Gc-Ts on 2128-123) RMS = 5.8 Total time: 1427 minutes ( 23.8 hours). Key: Gc=GILCREEK Hh=HARTRAO Ma=MATERA Sh=SESHAN25 Ts=TSUKUB32 Wf=WESTFORD Gc Hh Ma Sh Ts Wf Avg % obs. time: 28 19 40 21 28 37 29 % cal. time: 4 2 4 3 4 4 3 % slew time: 28 36 27 49 19 17 30 % idle time: 38 41 27 25 46 40 36 # of tapes : 1.6 1.1 2.2 1.3 1.6 2.1 total # scans: 412 185 376 287 428 358 341 # scans/hour : 17 7 15 12 17 15 14.2 Avg scan (sec): 58 89 91 64 56 90 74 # OF OBSERVATIONS BY BASELINE | Gc Hh Ma Sh Ts Wf StnTotal -------------------------------------- Gc|412 13 181 145 282 278 899 Hh| 185 155 48 36 54 306 Ma| 376 79 148 228 791 Sh| 287 269 51 592 Ts| 428 151 886 Wf| 358 762 Number of 2-station scans: 337 Number of 3-station scans: 252 Number of 4-station scans: 105 Number of 5-station scans: 38 Number of 6-station scans: 1 Total # of scans, observations: 733 2118 Average baseline components for all observations Average XY = 5840. Average XZ = 4729. Average YZ = 4796. Average length = 6567.