JADE-0401 (Japanese Dynamic Earth observation by VLBI) 2004 January 08-09 Notes prepared by kwada@gsi.go.jp Geographical Survey Institute, Japan Session JD0401 Start 2004-008 07:30:00 January 08 End 2004-009 07:29:14 January 09 Stations 3 Ts TSUKUB32 T Ai AIRA A Cc CHICHI10 C Duration: 24 hours Correlator: TSUKUBA(GSI) PURPOSE ======= The purpose of the JADE sessions is to monitor the plate motion and the local crustal movement around Japan. In 2004 fiscal year, JADE session will be carried out once a month. NETWORK ======= The standard configuration of the JADE projests consists of four stations. Station: Code Tsukuba Ts Aira Ai Chichijima Cc Shintotsukawa S3 (suspended in winter from December to April) SCHEDULE ======== This schedule was made by kwada@gsi.go.jp using sked. Schedule setup parameters: Early start 0 sec Corr. tape sync time 30 sec Minimum scan length 100 sec Maximum scan length 784 sec Minimum SNR by baseline for multi-baseline scans X-band (margin 5) S-band (margin 7) Ts Ai Ts Ai Ai 15 Ai 12 Cc 15 15 Cc 12 12 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 30% of ranked scans for selection, consider the last 4 hour of scans for sky coverage calculations, minimum 20 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 seconds Median SNR 25 at X-band 25 at S-band Number of observations 781 observations Average scans per station scans FREQUENCY SEQUENCE ================== Chann# Band Skyfreq(MHz) LOfreq(MHz) 1 x 8209.99 7680.0 2 x 8219.99 7680.0 3 x 8249.99 7680.0 4 x 8309.99 7680.0 5 x 8419.99 7680.0 6 x 8499.99 7680.0 7 x 8549.99 7680.0 8 x 8569.99 7680.0 9 s 2239.99 1600.0 10 s 2244.99 1600.0 11 s 2259.99 1600.0 12 s 2289.99 1600.0 13 s 2319.99 1600.0 14 s 2329.99 1600.0 15 s 2344.99 1600.0 16 s 2354.99 1600.0 APPENDIX ======== SKED Summary from file /corr/users1/schedule/skd_files/jd0401.skd for experiment JD0401 (all scans with at least one subnet station) Average number of obs. per baseline per source (normalized by up-time) = 4.7 Min = .0 Max = 28.8 (Baseline Ts-Ai on 1741-038) RMS = 5.3 Total time: 1437 minutes ( 24.0 hours). Key: Ts=TSUKUB32 Ai=AIRA Cc=CHICHI10 Ts Ai Cc Avg % obs. time: 42 85 85 71 % cal. time: 3 3 3 3 % slew time: 9 5 5 6 % idle time: 45 5 5 18 total # scans: 260 261 261 260 # scans/hour : 10 10 10 10.9 Avg scan (sec): 139 284 284 235 Total GBytes: 653 1334 1334 1107 # of tapes : 7.0 14.0 14.0 tape change times (hhmm): 1128 0920 0920 1445 1102 1102 1740 1247 1247 2113 1433 1433 0122 1628 1628 0459 1815 1815 0000 2007 2007 0000 2158 2158 0000 2344 2344 0000 0132 0132 NOTE: This schedules uses 13 tapes. Tapechanges times are listed for the first 10 tapes. # OF OBSERVATIONS BY BASELINE | Ts Ai Cc StnTotal -------------------------- Ts|260 260 260 520 Ai| 261 261 521 Cc| 261 521 Number of 2-station scans: 1 Number of 3-station scans: 260 Total # of scans, observations: 261 781