Voyager LECP Data Analysis Handbook
Data File Descriptions
Experiment Data Record (EDR) Format Specification
Cruise 2
(From Document 618-306, Revision D)
The LECP EDR science record is designed to a 48-second instrument measurement period. Any data not present during the instrument measurement will be filled with binary zeroes.
A logical record corresponds to an instrument measurement period and in this instance is also the science physical record structure.
The science logical/physical record structure is diagrammed in Figure 5.3-1.
Figure 5.3-1. LECP EDR Tape Record (Science)
|
Standard Header (60 32-bit Words) |
Subheader (8 32-bit Words) |
Science Data (160 32-bit Words) |
= 40 MF (228 32-bit Words) CR2 |
Figure 5.3-3 defines the data word.
Figure 5.3-3. LECP Science Data Word (CR-2)
|
Spare |
LECP Science Data Word |
||||||||||||||
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Figure 5.3-4 and Table 5.3-1 describe the structure and contents of the LECP science record subheader.
Figure 5.3-4. LECP Science Record Subheader Format, CR-2
| Word | Bits 31 16 0 |
31 16 0 |
|
| 1 | LECP CMD WRD #1 |
Spare |
Spare |
| 3 | Spare | Spare | |
| 5 | Spare | Spare | |
| 7 | Spare | Spare | |
Table 5.3-1. LECP Science Record Subheader Block Table (CR-2)
| Item | Word | Bits |
Description |
| 1 | 1 | 31-16 | LECP CMD WRD No. 1 MF38 |
| 2 | 1 | 15-0 | Spare |
| 3 | 2 | 31-0 | Spare |
| 4 | 3 | 31-0 | Spare |
| 5 | 4 | 31-0 | Spare |
| 6 | 5 | 31-0 | Spare |
| 7 | 6 | 31-0 | Spare |
| 8 | 7 | 31-0 | Spare |
| 9 | 8 | 31-0 | Spare |
Figure 5.3-5 and Table 5.3-2 define the science record data block structure and contents. Figure 5.3-6 defines the LECP data arrangement.
Figure 5.3-5. LECP EDR Science Data Block (CR-2)
| EDR Data Word |
Bits 31 |
16 0 | 31 | 16 0 | 31 | 16 0 | 31 | 16 0 |
| 1 | PHA1 Data Words | R/S G1 Data Words | ||||||
| MF 1 | MF 1 | |||||||
| 5 | PHA2 Data Words | PHA3 Data Words | ||||||
| MF 2 | MF 2 | |||||||
| 9 | R/S G2 Data Words | PHA4 Data Words | ||||||
| MF 3 | MF 3 | |||||||
| 13 | PHA5 Data Words | R/S G3 Data Words | ||||||
| MF 4 | MF 4 | |||||||
The above structure repeats itself 9 more times (total of 160 32-bit words), with the following R/S group exceptions: contained in Figure 5.3-6.
Next: Cruise 3
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Updated 8/9/19, Cameron Crane
VOYAGER 1 ELAPSED TIME
*Since official launch
September 5, 1977, 12:56:00:00 UTC
VOYAGER 2 ELAPSED TIME
*Since official launch
August 20, 1977, 14:29:00:00 UTC
QUICK FACTS
Mission Duration: 40+ years have elapsed for both Voyager 1 and Voyager 2 (both are ongoing).
Destination: Their original destinations were Saturn and Jupiter. Their current destination is interstellar space.