JADE-0404 (Japanese Dynamic Earth observation by VLBI) 2004 April 06-07 Notes prepared by kwada@gsi.go.jp Geographical Survey Institute, Japan Session JD0404 Start 2004-097 02:00:00 April 06 End 2004-098 02:02:50 April 07 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 5) Ts Ai Ts Ai Ai 19 Ai 19 Cc 19 15 Cc 19 15 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 30 at X-band 30 at S-band Number of observations 713 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/jd0404.skd for experiment JD0404 (all scans with at least one subnet station) Average number of obs. per baseline per source (normalized by up-time) = 4.3 Min = .0 Max = 26.5 (Baseline Ts-Ai on 1741-038) RMS = 5.1 Total time: 1445 minutes ( 24.1 hours). Key: Ts=TSUKUB32 Ai=AIRA Cc=CHICHI10 Ts Ai Cc Avg % obs. time: 40 87 87 71 % cal. time: 2 2 2 2 % slew time: 9 5 5 6 % idle time: 47 3 4 18 total # scans: 237 239 239 238 # scans/hour : 9 9 9 9.9 Avg scan (sec): 147 318 318 261 Total GBytes: 630 1369 1369 1122 # of tapes : 7.0 14.0 14.0 tape change times (hhmm): 0522 0345 0345 0925 0530 0530 1223 0717 0717 1628 0855 0855 2106 1042 1042 0105 1232 1232 0000 1420 1420 0000 1611 1611 0000 1801 1801 0000 1946 1946 NOTE: This schedules uses 13 tapes. Tapechanges times are listed for the first 10 tapes. # OF OBSERVATIONS BY BASELINE | Ts Ai Cc StnTotal -------------------------- Ts|237 237 237 474 Ai| 239 239 476 Cc| 239 476 Number of 2-station scans: 2 Number of 3-station scans: 237 Total # of scans, observations: 239 713