JADE-0804 (Japanese Dynamic Earth observation by VLBI) 2008 APR 17-18 Notes prepared by kokado@gsi.go.jp Geographical Survey Institute, Japan Session JD0804 Start 2008-108 02:00:00 APR 17 End 2008-109 01:54:29 APR 18 Stations 1 Ts T TSUKUB32 2 Ai A AIRA 3 Cc C CHICHI10 4 Vm M VERAMZSW 5 Vs S VERAISGK 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 2008 fiscal year, JADE session will be carried out once a month. NETWORK ======= The standard configuration of the JADE projests consists of some stations. Code : Station Ts Tsukuba Ai Aira Cc Chichijima Vm VERA Mizusawa Vs VERA Ishigakijima SCHEDULE ======== This schedule was made by kokado@gsi.go.jp using sked. Schedule setup parameters: Early start sec Corr. tape sync time ON sec Minimum scan length sec Maximum scan length sec Minimum SNR by baseline for multi-baseline scans X-band (margin 8) S-band (margin 8) Ts Ai Cc Vm Ts Ai Cc Vm Ai 18 Ai 16 Cc 18 16 Cc 16 15 Vm 18 18 18 Vm 16 16 16 Vs 18 18 18 18 Vs 16 16 16 16 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 0 of ranked scans for selection, consider the last 0 hour of scans for sky coverage calculations, minimum : 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 131 seconds Median SNR 40 at X-band 35 at S-band Number of observations 2522 observations Average scans per station 243 scans FREQUENCY SEQUENCE ================== Chann# Band Skyfreq(MHz) LOfreq(MHz) 1 x 8204.99 7680.0 2 x 8214.99 7680.0 3 x 8244.99 7680.0 4 x 8304.99 7680.0 5 x 8414.99 7680.0 6 x 8494.99 7680.0 7 x 8544.99 7680.0 8 x 8564.99 7680.0 9 s 2229.99 1600.0 10 s 2234.99 1600.0 11 s 2249.99 1600.0 12 s 2279.99 1600.0 13 s 2309.99 1600.0 14 s 2319.99 1600.0 15 s 2334.99 1600.0 16 s 2344.99 1600.0 APPENDIX ======== SKED Summary from file /home/sked/skd_files/jd0804.skd for experiment JD0804 (all scans with at least one subnet station) Average number of obs. per baseline per source (normalized by up-time) = 15.8 Min = 0.0 Max = 93.1 (Baseline Ts-Vm on 1921-293) RMS = 23.5 Total time: 1435 minutes ( 23.9 hours). Key: Ts=TSUKUB32 Ai=AIRA Cc=CHICHI10 Vm=VERAMZSW Vs=VERAISGK Ts Ai Cc Vm Vs Avg % obs. time: 19 44 46 39 37 37 % cal. time: 0 0 0 0 0 0 % slew time: 11 6 7 10 9 9 % idle time: 69 48 47 51 53 54 total # scans: 278 268 270 268 243 265 # scans/hour : 12 11 11 11 10 11 Avg scan (sec): 60 142 145 124 131 120 Total GBytes: 300 687 706 597 575 573 Total GB(M5): 267 610 627 531 511 509 # of tapes : 1.0 1.0 1.0 1.0 1.0 tape change times (hhmm): Total number of tapes: 5.0 Total GBytes (M5) recorded: 2546.3 # OF OBSERVATIONS BY BASELINE | Ts Ai Cc Vm Vs StnTotal ----------------------------------- Ts| 263 265 268 239 1035 Ai| 265 254 243 1025 Cc| 255 240 1025 Vm| 230 1007 Vs| 952 Number of 2-station scans: 12 Number of 3-station scans: 8 Number of 4-station scans: 36 Number of 5-station scans: 227 Total # of scans, observations: 283 2522