Session Notes for rd1004 Prepared by K. Baver, NVI, Inc./GSFC Schedule date: 2010-May-04 In 2009, four R&D sessions, RD0907 through RD0910, tested a proposed, new strategy for scheduling the IVS-INT01 sessions that provide rapid, preliminary UT1 estimates. The purpose of the proposed strategy was to improve the precision of these estimates. In 2010, a second series of R&D sessions will supplement the initial testing of the strategy. Details are given below. The new series started with RD1001, and RD1004 is the fourth session in the series. We divide the seven stations in this session into two subnets which are scheduled independently: 1.) The first subnet is the intensive network of Kokee-Wettzell. This will start at 19:22, after the conclusion of the IVS-INT01 session on May 4, and end at 17:22 on May 5. 2.) The second subnet is NyAlesund, Onsala, Tigo, Tsukuba, and Westford. This runs from 17:30 on May 4 to 17:30 on May 5. The Kokee-Wettzell network is scheduled as a series of 22 consecutive, independent intensives using alternating strategies. A) STANDARD INTENSIVES. The intensives that start within even hours (e.g., 20:22, 22:22, 00:22... etc) are scheduled using the standard intensive sources and scheduling strategy. B) TEST INTENSIVES. The intensives that start within odd hours (e.g., 19:22, 21:22, 23:22, 01:22, ... etc) are scheduled using an enlarged source list. Unlike 24 hour sessions, which can observe the whole sky, intensives can observe only a small slice of the sky, and this slice varies depending on when the intensive starts and the time of the year. Because of this, the results from the sessions might depend on what part of the sky is observed. In the first series of R&D sessions, RD0907 through RD0910, the start times were chosen so that the intensives would be consistent between sessions. The STANDARD INTENSIVES always looked at a part of the sky sampled by STANDARD INTENSIVES in other sessions. The TEST INTENSIVES looked at a part of the sky observed by TEST INTENSIVES in other sessions. To control for the fact that each of the STANDARD and TEST INTENSIVE series observed only half of the sky in the previous series, we swap things around in the new series. Each STANDARD INTENSIVE will observe a slice of the sky previously observed by a TEST INTENSIVE, and vice-versa. The five station network observes independently and serves as an independent external check on EOP. The GSFC analysis center will analyze the 22 pseudo intensive sessions with a view towards determining if one of the scheduling strategies is better in terms of things like: lower formal errors; better agreement with independent measures of UT1; and robustness of the schedule. The schedule uses the standard R1 256 data-rate. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD1004 Description R&D-04 2010. Intensive test Scheduler: NASA Correlator: TBD Start: 2010-124-17:30:00 End: 2010-125-17:30:00 Current yyyyddd: 2010124 (2010.34) ( 15321 MJD, TUES 4MAY.) Greenwich sidereal time: 8:19: 0.00 (17:30: 0 UT) Sun's RA and DEC: 2h 46.7m 16d 4.9 =========================================================== First observations Observation listing from file ./rd1004.skd for experiment RD1004 Source Start DURATIONS name yyddd-hhmmss Kk Ny On Tc Ts Wf Wz 0307+380 10124-173000| 500 500 500 500 | 0133+476 10124-173906| 30 36 30 36 | 3C418 10124-174033| 30 30 | 0727-115 10124-174104| 69 69 30 | 0808+019 10124-174303| 500 500 500 410 | 0016+731 10124-175258| 70 114 38 114 | 3C371 10124-175743| 78 95 30 95 | 1342+662 10124-180158| 111 165 54 165 | 1520+319 10124-180433| 30 30 | 1502+036 10124-180544| 30 30 | . . . 0808+019 10124-191441| 500 500 500 381 | 0016+731 10124-192200| 43 43| 1732+389 10124-192338| 101 101| 0133+476 10124-192421| 30 45 30 45 | 1800+440 10124-192606| 30 30 | 0727-115 10124-192624| 62 62 30 | 0529+483 10124-192634| 96 96| 0544+273 10124-192846| 200 200| 4C39.25 10124-192850| 30 30 30 | 0307+380 10124-193035| 266 306 105 306 | 0307+380 10124-193249| 115 115| 0430+289 10124-193520| 200 200| End of listing. =========================================================== Last observations Observation listing from file ./rd1004.skd for experiment RD1004 Source Start DURATIONS name yyddd-hhmmss Kk Ny On Tc Ts Wf Wz 3C418 10125-170711| 30 30 | NRAO512 10125-170758| 116 116| 0307+380 10125-170936| 500 500 500 500 | 0059+581 10125-171104| 60 60| 1418+546 10125-171303| 55 55| 1611+343 10125-171437| 40 40| NRAO512 10125-171553| 117 117| 0059+581 10125-171900| 60 60| 3C371 10125-171918| 78 95 30 95 | 1739+522 10125-172102| 47 47| 2356+385 10125-172136| 41 41 | 0727-115 10125-172242| 69 69 30 | OJ287 10125-172515| 30 30 30 | 3C274 10125-172649| 56 56 43 | 1351-018 10125-172834| 33 33 | End of listing. =========================================================== SKED Summary from file ./rd1004.skd for experiment RD1004 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 2.3 Min = 0.0 Max = 240.0 (Baseline Ny-Ts on 2335-027) RMS = 8.6 Total time: 1439 minutes ( 24.0 hours). Key: Kk=KOKEE Ny=NYALES20 On=ONSALA60 Tc=TIGO Ts=TSUKUB32 Wf=WESTFORD Wz=WETTZELL Kk Ny On Tc Ts Wf Wz Avg % obs. time: 59 64 75 57 19 68 59 57 % cal. time: 6 4 3 1 3 3 6 4 % slew time: 20 18 17 3 11 15 11 14 % idle time: 14 14 4 38 66 13 23 25 total # scans: 547 316 243 129 279 285 547 335 # scans/hour : 23 13 10 5 12 12 23 14 Avg scan (sec): 92 175 266 381 57 205 92 180 # data tracks: 16 16 16 16 16 16 16 # Mk5 tracks: 16 16 16 16 16 16 16 Total GBytes: 1820 1987 2329 1769 575 2105 1820 1772 Total GB(M5): 1618 1766 2070 1573 511 1871 1618 1575 # of tapes : 1.0 1.0 1.0 1.0 0.1 1.0 1.0 tape change times (hhmm): Total number of tapes: 6.1 Total GBytes (M5) recorded: 11026.7 # OF OBSERVATIONS BY BASELINE | Kk Ny On Tc Ts Wf Wz StnTotal --------------------------------------------- Kk| 0 0 0 0 0 547 547 Ny| 218 84 222 210 0 734 On| 105 126 219 0 668 Tc| 14 114 0 317 Ts| 161 0 523 Wf| 0 704 Wz| 547 Number of 2-station scans: 700 Number of 3-station scans: 66 Number of 4-station scans: 187 Number of 5-station scans: 0 Number of 6-station scans: 0 Number of 7-station scans: 0 Total # of scans, observations: 953 2020 ===========================================================