Fundamental Technologies

Voyager LECP Pages

Record Format for Near Encounter

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

 Near Encounter Data Block Contents 

ITEM

ARRAY

INDEX

NAME

AVG

TYPE

LOCATION

SUBSCRIPT

40

R27(27,16)

1

PL01

1

R*4

39-92

1-27

 

 

2

PL02

1

R*4

93-147

28-54

 

 

3

PL03

1

R*4

147-200

55-81

 

 

4

EG06

1

R*4

201-254

82-108

 

 

5

EG07

1

R*4

255-308

109-135

 

 

6

EG08

1

R*4

309-362

136-162

 

 

7

EG09

1

R*4

363-416

163-189

 

 

8

EB01/EB01 alt

1

R*4

417-470

190-216

 

 

9

EB02/EB02 alt

1

R*4

471-524

217-243

 

 

10

EB03/EB03 alt

1

R*4

525-578

244-270

 

 

11

EB04/EB04 alt

1

R*4

579-632

271-294

 

 

12

EB05/EB05 alt

1

R*4

633-686

298-324

 

 

13

PD09/PD09 alt

1

R*4

687-740

325-351

 

 

14

PD10/PD11 alt

1

R*4

741-794

352-378

 

 

15

PD11/PD11 alt

1

R*4

795-848

379-405

 

 

16

AD03/AD03 alt

1

R*4

849-902

406-432

41

R09(9,29)

1

PL01

3

R*4

903-920

433-441

 

 

2

PL02

3

R*4

921-938

442-450

 

 

3

PL03

3

R*4

939-957

451-459

 

 

4

PL04

1

R*4

957-974

460-468

 

 

5

PL05

1

R*4

975-992

469-477

 

 

6

PL06

1

R*4

993-1010

478-486

 

 

7

PL07

1

R*4

1011-1028

487-495

 

 

8

PL08

1

R*4

1029-1046

496-504

 

 

9

AL01

1

R*4

1047-1064

505-513

 

 

10

AL02

1

R*4

1065-1082

514-522

 

 

11

EG06

3

R*4

1083-1100

523-531

 

 

12

EG07

3

R*4

1101-1118

532-540

 

 

13

EG08

3

R*4

1119-1136

541-549

 

 

14

EG09

3

R*4

1137-1154

440-558

 

 

15

SA00

1

R*4

1155-1172

559-567

 

 

16

SA01

1

R*4

1173-1190

568-576

 

 

17

SA02

1

R*4

1191-1208

577-585

 

 

18

SA03

1

R*4

1209-1226

586-594

 

 

19

SB00

1

R*4

1227-1244

595-603

 

 

20

SB01

1

R*4

1245-1262

604-612

 

 

21

SB02

1

R*4

1263-1280

613-621

 

 

22

SB03

1

R*4

1281-1298

622-630

 

 

23

AB11

1

R*4

1299-1316

631-639

 

 

24

AB12

1

R*4

1317-1334

640-648

 

 

25

AB13

1

R*4

1335-1352

649-657

 

 

26

IL00

1

R*4

1353-1370

658-666

 

 

27

IB00

1

R*4

1371-1388

667-675

 

 

28

AD04/AD04 alt

1

R*4

1389-1406

676-684

 

 

29

ZD04/ZD04 alt

1

R*4

1407-1424

685-693

42

RG18(18,4)

1

AG18

1

R*4

1425-1460

694-711

 

 

2

BG18

1

R*4

1461-1496

712-729

 

 

3

CG18

1

R*4

1497-1532

730-747

 

 

4

DG18

1

R*4

1533-1568

748-765

43

N27(27,16)

Data Quality Words for R27(27,16)

I*2

1569-2000

 

44

N9(9,29)

Data Quality Words for R9(9,29)

I*2

2001-2261

 

45

NG18(18,4)

Data Quality Words for RG18(18,4)

I*2

2262-2333

 

Record Structure for Near Encounter Mode

Header Block 38 I*2 words = 96 bytes Data Block=765 R*4 words + 765 I*2 words=4590 bytes

TOTAL = 4666 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

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

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