Session Notes for rd1803 Prepared by K. Le Bail, NVI, Inc./GSFC =========================================================== PURPOSE AND GENERAL NOTES =========================================================== GAIA proposal The Laboratory d'Astrophysique de Bordeaux (LAB) subnmitted in 2012 a proposal to observe 195 ICRF2 transfer sources in the context of the GAIA mission. These sources were added to the GSFC monitoring program and 37 sources were scheduled in Gaia-dedicated R&D sessions. In February 2017, we studied the position uncertainties and the observation frequency of the 195 sources of the LAB proposal. Twenty-seven of these sources have a bad observation frequency: they were observed successfully in less than five sessions a year while the LAB requirement was twelve sessions a year. Most of these sources have bad uncertainties compared to the other sources of the set (larger than 50 microas). Three additional sources have good position uncertainties and an observation frequency of five to eleven successful sessions a year. However they are sources that were observed in previous Gaia-dedicated R&D sessions and the concern is that if they are not scheduled in coming dedicated R&D sessions, their observation frequency may drop. The sources scheduled in the Gaia-dedicated R&D sessions scheduled to observe after March 1st, 2017 are these thirty sources. When compared to the previous categories determined by the LAB, one source was in category 1, five sources were in category 2, five sources were in category 3 and nineteen sources were in category 4. In RD1803, we schedule 22 out of the thirty sources in the astro mode of sked. We used a maxscan value of 600 seconds. Forty of the good geodetic sources are used as base of a stable source set and uniform sky coverage. We use the sked flux catalog for all sources. We increased the weights of the stations Fortleza, Hartrao, and Hobart26 to increase the observations in the south. Wettzell and Kokee will observe INT I18101 during the time from 1815 UT to 1945 UT. To stay consistent with the station media size, the command FILL was used on all stations on the period 18101180000-18102160000 and on FtHhHoKkKmMa on 18102160000-end with a fill_off (buffer offset) of 10 seconds. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD1803 Description R&D-04/2018 Scheduler: NASA Correlator: SHAO Start: 2018-101-18:00:00 End: 2018-102-18:00:00 Current yyyyddd: 2018101 (2018.28) ( 18220 MJD, WED. 11APR.) Greenwich sidereal time: 07:19:36 (18:00:00 UT) Sun's RA and DEC: 1h 20.6m 8d 29.6 =========================================================== First observations Observation listing from file ./rd1803.skd for experiment RD1803 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Kk Km Ma Ny Wz 0805+410 18101-180000| 369 341 372 469 469 174| 1520+319 18101-180356| 162 223 223| 1846+322 18101-180836| 276 137 276 | 0420+022 18101-180916| 150 140 150 136 134| 0241+622 18101-181221| 600 600 600| 0823-223 18101-181541| 519 519 | 1143-332 18101-181711| 600 600 427 | End of listing. =========================================================== Last observations Observation listing from file ./rd1803.skd for experiment RD1803 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Kk Km Ma Ny Wz 1251-197 18102-175111| 176 176 | 0202+319 18102-175200| 148 148 104 84| 2155-304 18102-175253| 239 239 | 0345+460 18102-175528| 67 67 40| 1354-152 18102-175547| 51 51 | 0716+714 18102-175753| 117 117 114 64| 1424-418 18102-175851| 59 59 | 1936-155 18102-175851| 59 59 | End of listing. =========================================================== SKED Summary from file ./rd1803.skd for experiment RD1803 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 3.6 Min = 0.0 Max = 57.6 (Baseline Kk-Km on 1349-439) RMS = 6.9 Total time: 1440 minutes ( 24.0 hours). Key: Ft=FORTLEZA Hh=HARTRAO Ho=HOBART26 Kk=KOKEE Km=KUNMING Ma=MATERA Ny=NYALES20 Wz=WETTZELL Ft Hh Ho Kk Km Ma Ny Wz Avg % obs. time: 25 59 66 61 66 67 72 70 61 % cal. time: 1 2 2 2 2 2 2 2 2 % slew time: 18 33 23 11 22 20 10 8 18 % idle time: 55 6 9 25 9 10 15 18 19 total # scans: 105 155 153 164 187 202 171 199 167 # scans/hour : 4 6 6 7 8 8 7 8 7 Avg scan (sec): 207 327 373 322 304 286 364 306 310 # data tracks: 32 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 32 Total TB(M5): 1.39 3.25 3.65 3.38 3.64 3.70 3.98 3.90 3.36 # OF OBSERVATIONS BY BASELINE | Ft Hh Ho Kk Km Ma Ny Wz Total -------------------------------------------------- Ft| 40 8 19 11 58 26 42 204 Hh| 49 0 66 70 25 61 311 Ho| 90 87 12 13 8 267 Kk| 74 25 44 36 288 Km| 44 51 56 389 Ma| 108 121 438 Ny| 117 384 Wz| 441 Number of 2-station scans: 219 Number of 3-station scans: 178 Number of 4-station scans: 63 Number of 5-station scans: 20 Number of 6-station scans: 2 Number of 7-station scans: 0 Number of 8-station scans: 0 Total number of scans: 482 Total number of obs: 1361 Total integrated obs-time: 395665 Average obs-time: 290.7 Histogram of observation durations Dur: 30 60 90 120 150 180 210 240 270 300 330 360 390 420 450 480 510 540 570 600 #Obs: | 189| 99| 98| 85| 87| 65| 48| 33| 76| 57| 36| 35| 28| 30| 44| 38| 32| 46| 235 Average X-band SNRs by baseline | Ft Hh Ho Kk Km Ma Ny Wz AVG ------------------------------------------------- Ft| 39 24 30 43 39 43 49 40 Hh| 31 - 47 58 55 64 50 Ho| 27 37 39 31 41 32 Kk| 33 41 44 50 35 Km| 95 71 105 59 Ma| 76 103 75 Ny| 101 74 Wz| 87 Average S-band SNRs by baseline | Ft Hh Ho Kk Km Ma Ny Wz AVG ------------------------------------------------- Ft| 26 18 30 28 19 22 23 23 Hh| 25 - 32 28 28 29 28 Ho| 26 30 23 19 25 26 Kk| 39 27 36 33 32 Km| 39 37 46 36 Ma| 25 31 28 Ny| 33 30 Wz| 33 =========================================================== Recording mode Name Code GEOSX8N 8F Recording mode for: FORTLEZA HARTRAO HOBART26 KOKEE KUNMING MATERA NYALES20 WETTZELL Mode Tot.Rate Tot.BandW #BBC #bits Barrel Mk341:1 512 Mbits 128 MHz 14 2 NONE Chan.BW #Subpasses Tracks(*fan) Tot.tracks 8.00 MHz 1 32(*1) 32 X-band spanned bw= 720.0 MHz rms spanned bw= 280.4 MHz S-band spanned bw= 140.0 MHz rms spanned bw= 50.9 MHz Effective number of 1-bit channels recorded per sub-pass X S Total 19.13 11.48 30.61 =========================================================== Tape types ID Station Tape length Density Passes Ft FORTLEZA Mark5A Hh HARTRAO Mark5B Ho HOBART26 Mark5B Kk KOKEE Mark5B Km KUNMING Mark5B Ma MATERA Mark5B Ny NYALES20 Mark5B Wz WETTZELL Mark5B =========================================================== SNR targets Minimum SNR by baseline for multi-baseline scans X-band (margin 0) S-band (margin 0) X-band (ast_margin 0) S-band (ast_margin 0) Ft Hh Ho Kk Km Ma Ny Ft Hh Ho Kk Km Ma Ny Hh 20 Hh 15 Ho 20 20 Ho 15 15 Kk 20 20 20 Kk 15 15 15 Km 20 20 20 20 Km 15 15 15 15 Ma 20 20 20 20 20 Ma 15 15 15 15 15 Ny 20 20 20 20 20 20 Ny 15 15 15 15 15 15 Wz 20 20 20 20 20 20 20 Wz 15 15 15 15 15 15 15 ===========================================================