Voyager LECP

VOYAGER

Voyager LECP Data Analysis Handbook

Data File Descriptions

Experiment Data Record (EDR) Format Specification

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
1	MF 1				MF 1
5	4 R/S G2 Data Words				4 R/S G3 Data Words
5	MF 1				MF 1
9	4 PHA2 Data Words				4 R/S G4 Data Words
9	MF 1				MF 1
13	4 R/S G1 Data Words				4 PHA3 Data Words
13	MF 1				MF 1
17	4 R/S G2 Data Words				4 R/S G7 Data Words
17	MF 1				MF 2
21	4 PHA1 Data Words				4 R/S G5 Data Words
21	MF 2				MF 2
25	4 R/S G1 Data Words				4 PHA2 Data Words
25	MF 2				MF 2
29	4 R/S G2 Data Words				4 R/S G3 Data Words
29	MF 2				MF 2
33	4 PHA3 Data Words				4 R/S G6 Data Words
33	MF 2				MF 2
37	4 R/S G1 Data Words				4 PHA1 Data Words
37	MF 3				MF 3
41	4 R/S G2 Data Words				4 R/S G9 Data Words
41	MF 3				MF 3
45	4 PHA2 Data Words				4 R/S G4 Data Words
45	MF 3				MF 3
49	4 R/S G1 Data Words				4 PHA3 Data Words
49	MF 3				MF 3
53	4 R/S G2 Data Words				4 R/S G3 Data Words
53	MF 3				MF 4
57	4 PHA1 Data Words				4 R/S G5 Data Words
57	MF 4				MF 4
61	4 R/S G1 Data Words				4 PHA2 Data Words
61	MF 4				MF 4
65	4 R/S G2 Data Words				4 R/S G11 Data Words
65	MF 4				MF 4
69	4 PHA3 Data Words				4 R/S G6 Data Words
69	MF 4				MF 4
73	4 R/S G1 Data Words				4 PHA1 Data Words
73	MF 5				MF 5
77	4 R/S G2 Data Words				4 R/S G3 Data Words
77	MF 5				MF 5
81	4 PHA2 Data Words				4 R/S G4 Data Words
81	MF 5				MF 5
85	4 R/S G1 Data Words				4 PHA3 Data Words
85	MF 5				MF 5
89	4 R/S G2 Data Words				4 R/S G8 Data Words
89	MF 5				MF 6
93	4 PHA1 Data Words				4 R/S G5 Data Words
93	MF 6				MF 6
97	4 R/S G1 Data Words				4 PHA2 Data Words
97	MF 6				MF 6
101	4 R/S G2 Data Words				4 R/S G3Data Words
101	MF 6				MF 6
105	4 PHA3 Data Words				4 R/S G6 Data Words
105	MF 6				MF 6
109	4 R/S G1 Data Words				4 PHA1 Data Words
109	MF 7				MF 7
113	4 R/S G2 Data Words				4 R/S G10 Data Words
113	MF 7				MF 7
117	4 PHA2 Data Words				4 R/S G4 Data Words
117	MF 7				MF 7
121	4 R/S G1 Data Words				4 PHA3 Data Words
121	MF 7				MF 7
125	4 R/S G2 Data Words				4 R/S G3 Data Words
125	MF 7				MF 8
129	4 PHA1 Data Words				4 R/S G5 Data Words
129	MF 8				MF 8
133	4 R/S G1 Data Words				4 PHA2 Data Words
133	MF 8				MF 8
137	4 R/S G2 Data Words				4 R/S G12 Data Words
137	MF 8				MF 8
141	4 PHA3 Data Words				4 R/S G6 Data Words
141	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
1
5	4 R/S G3 Data Words - MF 1				4 R/S G4 Data Words - MF 1
5
9	4 R/S G5 Data Words - MF 1				4 R/S G6 Data Words - MF 1
9
13	4 R/S G1 Data Words - MF 1				4 R/S G2 Data Words - MF 1
13
17	4 R/S G3 Data Words - MF 1				4 R/S G4 Data Words - MF 2
17
21	4 R/S G7 Data Words - MF 2				4 R/S G9 Data Words - MF 2
21
25	4 R/S G1 Data Words - MF 2				4 R/S G2 Data Words - MF 2
25
29	4 R/S G3 Data Words - MF 2				4 R/S G4 Data Words - MF 2
29
33	4 R/S G15 Data Words - MF 2				4 R/S G17 Data Words - MF 2
33							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
325
329	4 R/S G18 Data Words - MF 19				4 R/S G18 Data Words - MF 19
329
333	4 R/S G18 Data Words - MF 19				4 R/S G18 Data Words - MF 19
333
337	4 R/S G18 Data Words - MF 19				4 R/S G18 Data Words - MF 19
337
341	4 R/S G18 Data Words - MF 19				4 R/S G18 Data Words - MF 20
341
345	4 R/S G18 Data Words - MF 20				4 R/S G18 Data Words - MF 20
345
349	4 R/S G18 Data Words - MF 20				4 R/S G18 Data Words - MF 20
349
353	4 R/S G18 Data Words - MF 20				4 R/S G18 Data Words - MF 20
353
357	4 R/S G18 Data Words - MF 20				4 R/S G18 Data Words - MF 20
357
	The structure of words 1 - 360 is repeated 3 more times for a total of 1440 32-bit words.

Return to EDR main page.

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Return to Voyager LECP Data Analysis Handbook Table of Contents.
Return to Fundamental Technologies Home Page.

Updated 8/9/19, Cameron Crane

VOYAGER 1 ELAPSED TIME

--:--:--:--

Days: Hours: Minutes: Seconds

*Since official launch
September 5, 1977, 12:56:00:00 UTC

VOYAGER 2 ELAPSED TIME

--:--:--:--

Days: Hours: Minutes: Seconds

*Since official launch
August 20, 1977, 14:29:00:00 UTC

QUICK FACTS

Manufacturer: Voyagers 1 and 2 were built in the Jet Propulsion Laboratory in Southern California.

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.