Fundamental Technologies

Voyager LECP Pages

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.

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Last modified 4/7/05, Tizby Hunt-Ward
tizby@ftecs.com