====== g336 ====== GPS tracking experiment. * Antennas: Ho, Wa, Cd * Source 1921-283 observed (transits = highest elev. at stations) for polarization calibration. * Ho and Cd: AGC loop was frozen after calibration time of 10 sec prior all GPS scans (constant gain during GPS tracks) * Ho: Parallel recording with Mk4 system and DBBC; Cd: DBBC ################################################################################### # Schedule summary for session: g336 # ################################################################################### Nominal start: 2016-12-01 03:30:00 Nominal end: 2016-12-01 06:40:22 ----------------------------------------------------------------------------------- Scan# Source name Type Start [UT] End [UT] Dur [s] Sations 1 1921-293 q 03:30:00 03:40:00 600 Cd Ho Wa 2 GPS BIIF-6 (PRN 06) s 03:42:34 03:47:31 297 Cd Ho Wa 3 GPS BIIR-11 (PRN 19) s 03:53:54 03:58:51 297 Cd Ho Wa 4 GPS BIIF-3 (PRN 24) s 04:02:00 04:06:57 297 Cd Ho Wa 5 GPS BIIR-13 (PRN 02) s 04:13:16 04:18:13 297 Cd Ho Wa 6 GPS BIIF-6 (PRN 06) s 04:21:09 04:26:06 297 Cd Ho Wa 7 GPS BIIR-11 (PRN 19) s 04:36:16 04:40:10 234 Cd Ho Wa 8 1921-293 q 04:46:09 04:56:09 600 Cd Ho Wa 9 GPS BIIR-13 (PRN 02) s 04:58:39 05:03:36 297 Cd Ho Wa 10 GPS BIIF-3 (PRN 24) s 05:07:07 05:12:04 297 Cd Ho Wa 11 GPS BIIF-6 (PRN 06) s 05:17:32 05:22:29 297 Cd Ho Wa 12 GPS BIIR-11 (PRN 19) s 05:25:01 05:29:58 297 Cd Ho Wa 13 1921-293 q 05:38:00 05:48:00 600 Cd Ho Wa 14 GPS BIIF-3 (PRN 24) s 05:50:37 05:55:34 297 Cd Ho Wa 15 GPS BIIR-13 (PRN 02) s 05:59:43 06:04:40 297 Cd Ho Wa 16 GPS BIIF-6 (PRN 06) s 06:11:09 06:16:06 297 Cd Ho Wa 17 GPS BIIR-13 (PRN 02) s 06:21:28 06:25:22 234 Cd Ho Wa 18 1921-293 q 06:30:22 06:40:22 600 Cd Ho Wa ----------------------------------------------------------------------------------- ===== Scheduling ===== * With VieVS Satellite scheduling tool, by A. Hellerschmied * Source 1921-283 observed for polarization calibration. * 10 min scans< * observations during transits (as far as possible) => highest elev. at stations => Largest variation in pol. (linear!) * GPS scans manually scheduled * 4 GPS sat. (PRN: 6, 19, 24, 2) * 3 to 4 scans per sat. * evenly distributed over track * scans at different elevations * 297 sec scans, if possible (~ 5 min) * 297 se = multiple of repos. int. * Stepwise tracking with 9 sec repos. int. * This time 9 sec instead of 10 sec to see, if this 9 sec period propagates into the derived delays, etc. * Continuous recording during GPS tracks * Schedule summary: {{:wg7:gnss_vlbi:2016:g336:g336_sum.txt|}} * Sky plots: {{:wg7:gnss_vlbi:2016:g336:sky_g336_cd_0330-0640.pdf|Cd}}, {{:wg7:gnss_vlbi:2016:g336:sky_g336_ho_0330-0640.pdf|Ho}}, {{:wg7:gnss_vlbi:2016:g336:sky_g336_wa_0330-0640.pdf|Wa}} * Elevation/visibility plot: {{:wg7:gnss_vlbi:2016:g336:2016-12-01_033000_elev_g336.pdf|}} * 20 sec calibration time + additional 5 sec idle time defined in param.txt => time to adjust the gain prior to recording * VEX files (Sat. pos. updated with most recent TLE available on 2016-12-01): {{:wg7:gnss_vlbi:2016:g336:g336cd.vex.txt|}} {{:wg7:gnss_vlbi:2016:g336:g336ho.vex.txt|}} {{:wg7:gnss_vlbi:2016:g336:g336wa.vex.txt|}} ===== Observation ===== * **Observers**: Tim Natusch (Wa); Jamie McCallum (Cd, Ho) * **Comments**: * Ho, Cd: No obvious problems. Tracking and recording was fine. Antennas were on source in time. ==== Tracking ==== * Stepwise tracking * 9 sec repos. int. * Station dependent VEX files with tracking points in topo. RaDec ===== Correlation ===== * SP3 file for GPS week 1925.4 from ftp://ftp.igs.org/pub/gps/1925/ (g336_igr19254.sp3) * 2016-12-08 - Jamie correlated scans 2 and 17 (only data from Wa and Ho) and got fringes ===== Available files ===== Files are available on the VieVS server (''sorts@vievs.hg.tuwien.ac.at'') at ''/home/sorts/GNSS_UTAS/2016/g336/''