Fundamental Technologies

Voyager LECP Pages

Low Energy Charged Particle (LECP) Experiment

From Document 618-306, Revision D - selected figures:

Figure 3.3-1. LECP EDR Tape Record (Science)

Standard Header
(60 32-bit words)		 Subheader
(8 32-bit words)		 Science Data
(1440 32-bit words) Far Encounter Mode
(1440 32-bit words) Near Encounter Mode

The overall length of the LECP EDR is 1508 words corresponding to 80 minor frames.

Figure 3.3-3. LECP Science Record Subheader Format

Data
Word

Bits
01                  16                    0   31                   16                  0
1 Command Word
MF 32		 Status Word 5
MF 36		 Status Word 6
MF 36		 Status Word 1
MF 40
3 Status Word 2
MF 40		 Status Word 3
MF 40		 Status Word 4
MF 40		 Status Word 5
MF 76
5 Status Word 6
MF 76		 Status Word 1
MF 80		 Status Word 2
MF 80		 Status Word 3
MF 80
7 Status Word 4
MF 80		 Command Word
MF 72		 Spare Spare

Figure 3.3-5. LECP Science Data Word (GS,OC-1)
(PHA and Rate/Status Data Words)

Spare

LECP Science Data Word
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Figure 3.3-6. LECP EDR Science Data Block (Far Encounter) (GS,OC-1)

EDR
Data Word		 Bits
31		 16  0 31 16  0 31 16  0 31 16   0
1 4 R/S G1 Data Words 4 PHA1 Data Words
MF 1       MF 1      
5 4 R/S G2 Data Words 4 R/S G3 Data Words
MF 1       MF 1      
9 4 PHA2 Data Words 4 R/S G4 Data Words
MF 1       MF 1      
13 4 R/S G1 Data Words 4 PHA3 Data Words
MF 1       MF 1      
17 4 R/S G2 Data Words 4 R/S G7 Data Words
MF 1       MF 2      
21 4 PHA1 Data Words 4 R/S  G5 Data Words
MF 2       MF 2      
25 4 R/S G1 Data Words 4 PHA2 Data Words
MF 2       MF 2      
29 4 R/S G2 Data Words 4 R/S G3 Data Words
MF 2       MF 2      
33 4 PHA3 Data Words 4 R/S G6 Data Words
MF 2       MF 2      
37 4 R/S G1 Data Words 4 PHA1 Data Words
MF 3       MF 3      
41 4 R/S G2 Data Words 4 R/S G9 Data Words
MF 3       MF 3      
45 4 PHA2 Data Words 4 R/S G4 Data Words
MF 3       MF 3      

49

 4 R/S G1 Data Words 4 PHA3 Data Words
MF 3       MF 3      
53 4 R/S G2 Data Words 4 R/S G3 Data Words
MF 3       MF 4      
57 4 PHA1 Data Words 4 R/S G5 Data Words
MF 4       MF 4      
61 4 R/S G1 Data Words 4 PHA2 Data Words
MF 4       MF 4      
65 4 R/S G2 Data Words 4 R/S G11 Data Words
MF 4       MF 4      
69 4 PHA3 Data Words 4 R/S G6 Data Words
MF 4       MF 4      
73 4 R/S G1 Data Words 4 PHA1 Data Words
MF 5       MF 5      
77 4 R/S G2 Data Words 4 R/S G3 Data Words
MF 5       MF 5      
81 4 PHA2 Data Words 4 R/S G4 Data Words
MF 5       MF 5      
85 4 R/S G1 Data Words 4 PHA3 Data Words
MF 5       MF 5      
89 4 R/S G2 Data Words 4 R/S G8 Data Words
MF 5       MF 6      
93 4 PHA1 Data Words 4 R/S G5 Data Words
MF 6       MF 6      
97 4 R/S G1 Data Words 4 PHA2 Data Words
MF 6       MF 6      
101 4 R/S G2 Data Words 4  R/S G3Data Words
MF 6       MF 6      
105 4 PHA3 Data Words 4  R/S G6 Data Words
MF 6       MF 6      
109 4 R/S G1 Data Words 4  PHA1 Data Words
MF 7       MF 7      
113 4 R/S G2 Data Words 4  R/S G10 Data Words
MF 7       MF 7      
117 4 PHA2 Data Words 4  R/S G4 Data Words
MF 7       MF 7      
121 4 R/S G1 Data Words 4  PHA3 Data Words
MF 7       MF 7      
125 4 R/S G2 Data Words 4  R/S G3 Data Words
MF 7       MF 8      
129 4 PHA1 Data Words 4  R/S G5 Data Words
MF 8       MF 8      
133 4 R/S G1 Data Words 4  PHA2 Data Words
MF 8       MF 8      
137 4 R/S G2 Data Words 4  R/S G12 Data Words
MF 8       MF 8      
141 4 PHA3 Data Words 4  R/S G6 Data Words
MF 8       MF 8      

The preceding data structure for MF 1-8 is repeated 9 more times (a total of 1440 32-bit words) with the following R/S Group exceptions:

MF EDR Data Words R/S Group
12; 52 211, 212; 931, 932 13
16; 56 283, 284; 1003, 1004 14
20; 60 355, 356; 1075, 1076 15
24; 64 427, 428; 1147, 1148 11
28; 68 499, 500; 1219, 1220 12
32; 72 571, 572; 1291, 1292 13
36; 76 643, 644 (LECP Status words
5 & 6);
1363, 1364 (Status words
5 & 6)		 16
40; 80 715 (Status words 1 & 2)
716 (Status words 3 & 4)
1435 (Status words 1 & 2)
1436 (Status words 3 & 4)		 17

Figure 3.3-7. LECP EDR Science Data Block (Near Encounter)
(GS, OC-1)

EDR
Data Word		 31 16   0 31 16   0 31 16   0 31 16   0
1 4 R/S G1 Data Words - MF 1 4 R/S G2 Data Words - MF 1
               
5 4 R/S G3 Data Words - MF 1 4 R/S G4 Data Words - MF 1
               
9 4 R/S G5 Data Words - MF 1 4 R/S G6 Data Words - MF 1
               
13 4 R/S G1 Data Words - MF 1 4 R/S G2 Data Words - MF 1
               
17 4 R/S G3 Data Words - MF 1 4 R/S G4 Data Words - MF 2
               
21 4 R/S G7 Data Words - MF 2 4 R/S G9 Data Words - MF 2
               
25 4 R/S G1 Data Words - MF 2 4 R/S G2 Data Words - MF 2
               
29 4 R/S G3 Data Words - MF 2 4 R/S G4 Data Words - MF 2
               
33 4 R/S G15 Data Words - MF 2 4 R/S G17 Data Words - MF 2
            Status Status
 

The sequence above repeats 8 more times
and is followed by:
325 4 R/S G18 Data Words - MF 19 4 R/S G18 Data Words - MF 19
               
329 4 R/S G18 Data Words - MF 19 4 R/S G18 Data Words - MF 19
               
333 4 R/S G18 Data Words - MF 19 4 R/S G18 Data Words - MF 19
               
337 4 R/S G18 Data Words - MF 19 4 R/S G18 Data Words - MF 19
               
341 4 R/S G18 Data Words - MF 19 4 R/S G18 Data Words - MF 20
               
345 4 R/S G18 Data Words - MF 20 4 R/S G18 Data Words - MF 20
               
349 4 R/S G18 Data Words - MF 20 4 R/S G18 Data Words - MF 20
               
353 4 R/S G18 Data Words - MF 20 4 R/S G18 Data Words - MF 20
               
357 4 R/S G18 Data Words - MF 20 4 R/S G18 Data Words - MF 20
               
 

The structure of words 1 - 360 is repeated
3 more times for a total of 1440 32-bit words.

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Last modified 4/22/05, Tizby Hunt-Ward
tizby@ftecs.com