Fundamental Technologies

Voyager LECP Pages

Record Format for Cruise 5A

List of Header Block Contents

ITEM INDEX NAME

TYPE

DESCRIPTION

1 1 SCID

I*1

Spacecraft Identification; 1=Voyager 1; 0=Voyager 2
2   MODE

I*1

Spacecraft telemetry mode 01(H)=CR2; 02(H)=CR3; 03(H)=CR4 04(H)=CR5; 05(H)=CR6; 07(H)=CR1 0A(H)=FE; 08(H)=NE; 18(H) or 1D(H) CR5A
Spacecraft Event Time-contains the Greenwich Mean of the first bit of the first spacecraft minor frame used in this LECP major frame
3 2 SCETH

I*2

Spacecraft Event Time, Hour-number of hours since the beginning of the current year plus 24. For the one hour interval Jan 1, 0000-0059 UT, SCET=24. The Day of Year may be computed using DAY=(SCETH/24)
4 3 SCETS

I*2

Spacecraft Event Time (sec.) number of seconds since the beginning of the current hour
5 4 SCETMS

I*2

Spacecraft Event Time, (millisec) no. of milliseconds since the beginning of the current second.
6 5 SCETY

I*2

Spacecraft Event Time, Year-contains the last two digits of the current year (i.e., 77, 78)
7 6 G18ID

I*1

Group 18 Identification-contains the number of the LECP data group being readout at the end of the current LECP major frame
8 7 SCETF

I*1

Spacecraft Event Time Flag-indicates that the spacecraft clock has been corrected in some manner in the JPL processing. Bit 0 indicates correction to the line count (0=none, 1=corrected) bit 1 the MOD60 counter and bit 2 the MOD2**16 counter.
9 7 MOD216

I*2

Mod2**16 Spacecraft Clock Word-contains the spacecraft Mod2**16 word for the first minor frame of the current record. This word is incremented every 48 minutes on the overflow of the Mod60 counter
10 8 M60

I*2

Mod60 Spacecraft Clock Word-contains the spacecraft Mod60 word for the first minor frame of the current record. It has a range of 0 to 59 and is incremented every 48 seconds at the overflow of the line counter
11 9 LC

I*2

Spacecraft Line Counter-contains the line count for the first minor frame in the current record LC ranges from 1 to 800(D) and is incremented every 0.06 seconds
12 10 S1

I*2

LECP Status Word 1, 10 bits, right justified
13 11 S2

I*2

LECP Status Word 2, 10 bits, right justified
14 12 S3

I*2

LECP Status Word 3, 10 bits, right justified
15 13 S4

I*2

LECP Status Word 4, 10 bits, right justified
16 14 S5

I*2

LECP Status Word 5, 10 bits, right Justified
17 15 S6

I*2

LECP Status Word 6, 10 bits, right justified
18 16 MP

I*2

LECP Motor Position-contains the motor position at the end of the current record. Bit 0 is set if the status word indicates motor centering, it is zero otherwise. Bits 1-3 contain the motor position with 0-7 corresponding to sector 1 thru 8 respectively. MP=-1 if motor position is unknown
19 17 NMS

I*2

Number of Motor Steps-indicates the number of motor steps within the current LECP Major Frame. Turn arounds in Sectors 8 and 1 or 2 are considered to be two steps. If = -1, datun is unknown.
20 18 LATEMP

I*2

LECP Log. Amp. Temperature-contains the log. amp. temp. (degrees C) x 128. LATEMP= -9999 if the temperature is unknown
21 19 TTEMP

I*2

LECP Telescope Temperature-contains the telescope temperature (degrees C) x 128. TTEMP= -9999 if the temperature is unknown
22 20 BAI

I*2

Basic Accumulation Interval-contains the number of milliseconds of accumulation times for the group 1 and 2 logics (Exception—for CR5A units are 0,01 sec.!!)
23 21 NG

I*2

Number of Groups-indicates the number of rate groups included in the current major frame
24 22 MRT/MPT

I*2

01=Master Rate Record, 02=Master Pulse Record, 4 SEDR, 10 ENG, 11 Cal
25 23 VN

I*2

Version Number-indicates the version of S1P used to process the current data
26 24 LEPT/LEMPA

I*2

Indicates data type in record: -1=Don't know; 0=LEPT; 1=LEMPA "Normal" NE Logics in GS3
27 25 RED A/B

I*2

Redundancy A or B logic flag, -1 Unknown, 0 = A; 1 = B
28 26 PROC. STAT

I*2

Check SW4 for 50/50. If 50/50 then Item 26 0=LEPT Norm F.E. 1=LEMPA
Also check DQW 14-15=11 (in CR5A 0 = S1P; 1=S2P)
29 27 STEPPING RATE

I*2

Motor period in seconds: -1 = Unknown; 0 = not decoded; 9000 = encounter stow (V2 Jupiter) 10000 Stowed or commanded to position; otherwise one of 5,6,24,48,192,360 or 384 sec.
30 28  

I*2

Status Word 5 (Near Encounter only) otherwise unused.
31 30  

I*2

Status Word 5 (Near Encounter only) otherwise unused.
32 31  

I*2

Status Word 5 (Near Encounter only) otherwise unused.
33 32  

I*2

Status Word 5 (Near Encounter only) otherwise unused.
34 33  

I*2

Status Word 5 (Near Encounter only) otherwise unused.
35 34  

I*2

Status Word 5 (Near Encounter only) otherwise unused.
36 35  

I*2

Status Word 5 (Near Encounter only) otherwise unused.
37 36  

I*2

Status Word 5 (Near Encounter only) otherwise unused.
38 37  

I*2

Status Word 5 (Near Encounter only) otherwise unused.
39 38  

I*2

Spare

Cruise 5A Data Block Contents

Item

Array

Index

Logic

#Avg

Type

Word

40

R3(3,32)

1

PL01

1

R*4

1-3

 

 

2

PL02

1

R*4

4-6

 

 

3

PL03

1

R*4

7-9

 

 

4

PL04

1

R*4

10-12

 

 

5

PL05

1

R*4

13-15

 

 

6

PL06

1

R*4

16-18

 

 

7

PL07

1

R*4

19-21

 

 

8

PL08

1

R*4

22-24

 

 

9

EB01

1

R*4

25-27

 

 

10

EB02

1

R*4

28-30

 

 

11

EB03

1

R*4

31-33

 

 

12

EB04

1

R*4

34-36

 

 

13

EB05

1

R*4

37-39

 

 

14

EG06

1

R*4

40-42

 

 

15

EG07

1

R*4

43-45

 

 

16

EG08

1

R*4

46-48

 

 

17

EG09

1

R*4

49-51

 

 

18

1

1

R*4

52-54

 

 

19

3

1

R*4

55-57

 

 

20

10

1

R*4

58-60

 

 

21

13/46

1

R*4

61-63

 

 

22

16

1

R*4

64-66

 

 

23

17/47

1

R*4

67-69

 

 

24

28

1

R*4

70-72

 

 

25

31

1

R*4

73-75

 

 

26

32

1

R*4

76-78

 

 

27

33

1

R*4

79-81

 

 

28

35

1

R*4

82-84

 

 

29

38

1

R*4

85-87

 

 

30

39

1

R*4

88-90

 

 

31

42

1

R*4

91-93

 

 

32

44

1

R*4

94-96

41

R1(26)

1

AL01

3

R*4

97

 

 

2

AL02

3

R*4

98

 

 

3

4

3

R*4

99

 

 

4

5

3

R*4

100

 

 

5

6

3

R*4

101

 

 

6

7

3

R*4

102

 

 

7

8

3

R*4

103

 

 

8

9

3

R*4

104

 

 

9

11

3

R*4

105

 

 

10

12

3

R*4

106

 

 

11

14

3

R*4

107

 

 

12

15

3

R*4

108

 

 

13

18

3

R*4

109

 

 

14

19

3

R*4

110

 

 

15

20

3

R*4

111

 

 

16

21

3

R*4

112

 

 

17

23

3

R*4

113

 

 

18

24

3

R*4

114

 

 

19

27

3

R*4

115

 

 

20

25

3

R*4

116

 

 

21

34

3

R*4

117

 

 

22

36

3

R*4

118

 

 

23

37

3

R*4

119

 

 

24

41

3

R*4

120

 

 

25

43

3

R*4

121

 

 

26

45

3

R*4

122

42

N3(3,32)

Data Quality Words for R3(3,32)

I*2

 

43

N1(26)

Data Quality Words for R1(26)

I*2

 

Record Structure for Cruise 5A Mode

Header Block 38 I*2 words = 76 bytes Rate Data  = 122 R*4 words + 122 I*2 words = 732 bytes Pulse Height Data 160 bytes

TOTAL = 968 bytes

Explanation of Data Quality Word Contents
Explanation of I*1 Representation
Explanation of I*2 Representation
R*4 Representation
Bit Definitions for LECP Status Word 1
Bit Definitions for LECP Status Word 2
Bit Definitions for LECP Status Word 3
Bit Definitions for LECP Status Word 4
Bit Definitions for LECP Status Word 5
Bit Definitions for LECP Status Word 6

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Last modified 8/2/05, Tizby Hunt-Ward
tizby@ftecs.com