ROLL ± 0.5297° Deadband 2023-288/03:03:00 ERT 2023-10-14 04:37:03 SCET YAW ± 0.5234° Deadband 2023-288/03:27:00 ERT 2023-10-14 05:01:03 SCET PITCH 20ms Pulsewidth 2023-288/03:51:00 ERT 2023-10-14 05:25:03 SCET
Voyager 1 FEBRUARY 12, 2022 (SCET 02-11 (d042) 18:35) S/C 31: MAGROL 1611 --- 1642 JULY 7, 2023 (SCET 07-06 (d187) 09:59) S/C 31: MAGROL 0807 --- 0937 AUGUST 5, 2023 (SCET 08-04 (d216) 11:57) S/C 31: MAGROL 1010 --- 1043 SEPTEMBER 21, 2023 (SCET 09-20 (d287) ) S/C 31: S/C 31 INITIAL CONDITIONS PYR: .05/.10/.25 SEPTEMBER 21, 2023 (SCET 09-20 (d263) 10:43) S/C 31: ▼ROLL LCG MITIGATION 0815 (04:58), ▼PITCH LCG MITIGATION 0840 (05:23), ▼YAW 0.3 DEG DEADBAND 0905 (05:48) SEPTEMBER 23, 2023 (SCET 09-22 (d265) 07:28) S/C 31: *ROLL LCG MITIGATION 0459, *PITCH LCG MITIGATION 0524, *YAW 0.3 DEG DEADBAND 0549 SEPTEMBER 23, 2023 (SCET 09-22 (d268) ) S/C 31: S/C 31 INITIAL CONDITIONS PYR: .05/.28/.25 OCTOBER 13, 2023 (SCET 10-12 (d285) 04:36) S/C 31: ▼ROLL 0.5 DEG DEADBAND (03:02) 0611, ▼YAW 0.5 DEG DEADBAND (03:26) 0635, ▼PITCH 20 MS PW (03:50) 0659 OCTOBER 15, 2023 (SCET 10-14 (d287) 05:01) S/C 31: *ROLL 0.5 DEG DEADBAND 0303, *YAW 0.5 DEG DEADBAND 0327, *PITCH 20 MS PW 0351 OCTOBER 15, 2023 (SCET 10-14 (d287) ) S/C 31: S/C 31 INITIAL CONDITIONS PYR: .05/.50/.50 OCTOBER 27, 2023 (SCET 10-26 (d299) 13:30) S/C 31: 1158 YAW=.05, 1929 YAW=.10 OCTOBER 28, 2023 (SCET 10-27 (d300) ) S/C 31: S/C 31 INITIAL CONDITIONS PYR: .05/.10/.50 NOVEMBER 4, 2023 (SCET 11-04 (d308) 01:00) S/C 31: MAGROL 2329 --- 0000 NOVEMBER 11, 2023 (SCET 11-10 (d313) 04:34) S/C 31: ▼YAW 0.4 DEG DEADBAND (03:08) 0609 NOVEMBER 13, 2023 (SCET 11-12 (d315) 04:38) S/C 31: *YAW 0.4 DEG DEADBAND 0309 NOVEMBER 13, 2023 (SCET 11-12 (d315) ) S/C 31: S/C 31 INITIAL CONDITIONS PYR: .05/.40/.50 Voyager 2 MARCH 18, 2022 (SCET 03-18 (d077) 05:25) S/C 32: MAGROL 2327 --- 0003 JUNE 17, 2022 (SCET 06-16 (d167) 22:25) S/C 32: MAGROL 1625 --- 1658 SEPTEMBER 15, 2022 (SCET 09-14 (d257) 17:25) S/C 32: MAGROL 1134 --- 1207 SEPTEMBER 16, 2023 (SCET 09-15 (d258) ) S/C 32: S/C 32 INITIAL CONDITIONS PYR: .05/.10/.25 SEPTEMBER 16, 2023 (SCET 09-15 (d258) 13:12) S/C 32: MAGROL 0748 --- 0821 NOVEMBER 5, 2023 (SCET 11-04 (d308) 06:06) S/C 32: ▼ROLL +/- 0.5 DEG DEADBAND (14:19) 0050, ▼YAW +/- 0.3 DEG DEADBAND (14:41) 0112 NOVEMBER 7, 2023 (SCET 11-06 (d310) 19:35) S/C 32: *ROLL 0.5 DEADBAND 1420, *YAW 0.3 DEADBAND 1442 NOVEMBER 8, 2023 (SCET 11-07 (d311) ) S/C 32: S/C 32 INITIAL CONDITIONS PYR: .05/.30/.50 DECEMBER 12, 2023 (SCET 12-11 (d345) 10:18) S/C 32: PYR=.05/.10/.25 0508↓ DECEMBER 12, 2023 (SCET 12-11 (d345) ) S/C 32: S/C 32 INITIAL CONDITIONS PYR: .05/.10/.25 DECEMBER 15, 2023 (SCET 12-14 (d348) 10:23) S/C 32: MAGROL 0514 --- 0550 DECEMBER 22, 2023 (SCET 12-22 (d356) 01:51) S/C 32: ▼ROLL 0.95 DEG DB (10:26) 2043 DECEMBER 22, 2023 (SCET 12-22 (d356) 02:13) S/C 32: ▼YAW 0.3 DEG DB (10:48) 2105 DECEMBER 24, 2023 (SCET 12-23 (d357) 15:35) S/C 32: *ROLL 0.95 DEG DB 1027 DECEMBER 24, 2023 (SCET 12-23 (d357) 15:57) S/C 32: *YAW 0.3 DEG DB 1049 DECEMBER 25, 2023 (SCET 12-24 (d358) ) S/C 32: S/C 32 INITIAL CONDITIONS PYR: .05/.30/.95
The Pitch-Yaw-Roll (PYR) limits on Voyager 2 changed from .05/.10/.25 for most of cruise 5A to .05/.30/.50 on November 7, 2023, then changed back to .05/.10/.25 on December 12, 2023 and were changed to .05/.30/.95 on December 25, 2023. The LEPCT singles rates and LEMPA rates did not change noticeably after the PYR limits changed. The LEPCT rates also showed no change during Voyager 2 MAGROL maneuvers. The PYR limit change and MAGROL dates were taken from the SFOS reports. The plots include all motor steps.
A valid MRT record is defined as a record with a valid time, valid motor position and no quality words equal to zero. This plot and spreadsheet show the difference in the BOT/GAP/EOT times and the time of the nearest valid MRT record. BOT and EOT differences are brown. Gap start and end differences are yellow. PYR times are from the SFOS files. Durations239-305.xlsx
The daily mean number of our mrt records decreased from 145 (135 median) for days 60 to 287 to 85 (88 median) for days 288-300 and increased to 105 (118 median) for days 301-306. Data from Stu about file sizes of final EDR files and the corresponding MRT files show that the ratio of MRT/EDR file sizes follows a similar trend.
EDR Files Size in bytes MRT File Size in Bytes MRT/EDR Sizes lecf23258.a 737044 vr123258.mrt 843076 1.14 lecf23265.a 855820 vr123265.mrt 993518 1.16 lecf23272.a 949840 vr123272.mrt 1055324 1.11 lecf23279.a 909436 vr123279.mrt 1046142 1.15 lecf23286.a 771160 vr123286.mrt 731530 0.95 lecf23293.a 806456 vr123293.mrt 665486 0.83 lecf23300.a 660040 vr123300.mrt 729682 1.11
The dsn telemetry BOT, EOT and GAP times adjusted for light travel time from SPICE align well with the record times in our mrt files. The largest discrepancies are on days 291 and 297 spacecraft time where the EOT extends over 30 minutes beyond the last record time. Telemetry_Gaps_OLT_Adjusted.xlsx
See the V1 Singles Rates Plots and the Eβ, Eβ' & PLO Rates Plots for plots of longer time periods.
The brown background indicates the telemetry limits. The Yellow background indicates the Gap limits. A wide Y range was used to show any outliers. All steps are included in the plots, including the 'motor position unknown' steps. The unknown position steps usually occur just before or after a time jump in the data and sometimes contain rates that are outliers. The zip files, named for the DSN day, contain various rate plots for the pass. 23-288.zip, 23-289.zip, 23-291.zip, 23-292.zip, 23-295.zip, 23-296.zip, 23-298.zip
Times and data quality words for weekly mrt files vr123265, vr123272, vr123279, vr123286 and vr123293 spanning the time range 2023-09-21 (day 264) to 2023-10-25 (day 298) were examined. rate_counts.xlsx
The first 3 MRT records in vr123286 have invalid times. The first 5 MRT records in vr123193 have invalid times. There are ENG and CAL records with invalid times at the start of the files that are not shown below.
SCET delt Num_Zero_QW Num_Nonzero_QW 2023-10-12 01:31:16.135 192.0 0 122 (end of vr123279) 2017-12-18 21:56:42.592 -183440074.0 114 8 (beginning of vr123286) 2022-01-05 08:56:32.943 127738790.0 86 36 2023-03-16 13:42:38.019 37601165.0 68 54 2023-10-12 01:34:28.135 18100310.0 0 122 2023-10-12 01:37:40.134 192.0 0 122 2023-10-12 01:40:52.134 192.0 0 122 2023-10-12 01:44:04.134 192.0 0 122 ... 2023-10-18 22:32:03.798 192.0 114 8 (end of vr123286) 2017-12-17 20:51:06.626 -184124457.0 106 16 (beginning of vr123293) 2017-12-19 03:59:54.584 112128.0 110 12 2017-12-20 07:08:42.547 97728.0 98 24 2022-03-31 11:33:16.826 134972674.0 98 24 2023-10-17 15:43:15.861 48830999.0 118 4 2023-10-19 05:39:15.783 136560.0 52 70 2023-10-19 05:40:51.783 96.0 0 122 2023-10-19 05:44:03.783 192.0 0 122 2023-10-19 05:47:15.783 192.0 0 122 2023-10-19 05:50:27.783 192.0 0 122 ... 2023-10-25 19:00:51.462 192.0 0 122 2023-10-25 19:04:03.462 192.0 0 122 2023-10-25 19:07:15.462 192.0 0 122 2023-10-25 19:10:27.462 192.0 54 68 (end of vr123293) 2023-10-26 13:12:03.425 64896.0 0 122 (beginning of vr123300) 2023-10-26 13:15:15.425 192.0 0 122 2023-10-26 13:18:27.425 192.0 0 122 2023-10-26 13:21:39.425 192.0 0 122 2023-10-26 13:24:51.425 192.0 0 122
There are 206 time gaps in the 4490 MRT records in the covered time range that are not the canonical 192s. The gaps with more than one occurrence are. Oddly, these gaps are all multiples of 48s.
Gap(sec) Count Gap(sec) Count 144.0 34 2064.0 2 48.0 34 2112.0 2 96.0 20 2544.0 2 240.0 7 816.0 2 528.0 4 864.0 2 336.0 4 1344.0 2 1872.0 3 912.0 2 624.0 3 1296.0 3 384.0 3
Each MRT record has 122 rates and corresponding data quality words. Data quality words that are 0 indicate missing rates. The number of data quality words at data gaps > 50*192 seconds were summed for 3 records before the gap to 3 records after the gap. Other than 4 high values from vr1286 the number of gaps after deadbands began is reasonably close to the number before deadbands. The light gray lines near the bottom of the plot below indicate the presence of MRT records. The dotted light gray vertical lines indicate the first MRT record after a large data gap. Data used to make this plot are in the rate_counts.xlsx file above.
