V1 Deadbands Testing of 3 Yaw Ranges: 0.1°, 0.3° and 0.5°

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

Pitch-Yaw-Roll (PYR) and MAGROL Dates from SFOS Files

▼ = R/T Command (Scheduled), ✷ = Result of R/T Command

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

Voyager 2 Roll limit changes

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.

LEPT Singles Rates

v2_pyr_changes_2023.png v2_magroll_2023-12.png v2_magroll_2023-09.png v2_magroll_2022-09.png v2_magroll_2022-06.png v2_magroll_2022-03.png

LEMPA Rates

v2_pl0_pyr_changes_2023 v2_pl0_magroll_2023-12 v2_pl0_magroll_2022-03 v2_eb_pyr_changes_2023 v2_eb_magroll_2023-12 v2_eb_magroll_2022-03 v2_ebp_pyr_changes_2023 v2_ebp_magroll_2023-12 v2_ebp_magroll_2022-03

Time Of Valid MRT Near BOT/GAP/EOT Times

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

Durations Durations

MRTs_per_pass.xlsx

V1_Valid_Record_Count_Per_192s

 

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.

VGR1_EDR_and_MRT_file_sizes_2020-2023-2023-300.png
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

Daily Record Count from Unfiltered Weekly MRT Files

V1_Daily_Record_Count_2023_weekly_mrts V1_Daily_Record_Count_Oct_2023_weekly_mrts

Telemetry Gaps

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

telemetry_gaps


Rates Check

See the V1 Singles Rates Plots and the Eβ, Eβ' & PLO Rates Plots for plots of longer time periods.

Singles Rates

V1_Singles_Deadband_Log
V1_Singles_Deadband_Linear

Full Resolution Triple Rates

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

V1_CH31_Rate_FullResoultion V1_CH42_Rate_FullResoultion V1_EB01_Rate_FullResoultion-23 V1_EB04_Rate_FullResoultion V1_CH16_Rate_FullResoultion-23 V1_PL01_Rate_FullResoultion V1_EB02_Rate_FullResoultion V1_PL03_Rate_FullResoultion

Data Quality

Invalid Times

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


 

Data Gaps

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.

v1_missing_rates