Cruise5A Rec Fmt

Fundamental Technologies

Voyager LECP Pages

Record Format for Cruise 5A

Latest MRT Record Header (CR5A) from ftecs

Integer	Byte	Variable	Description
1	1	MRID	SCID Spacecraft ID – 1=Voyager 1, 0=Voyager 2
1	2	MRMOD	SCDMSpacecraft telemetry mode 1-6 Cruise 2-7 7 Cruise 1 8 Near Encounter 10 (OAH) Far Encounter 24 (18H) Cruise 5A 19 (1DH) UV-5A
			Spacecraft Event Time - contains the Greenwich Mean Time (GMT) of the first PN bit of the first minor frame (MF) used in this LECP major frame.
2	3-4	MRETH	SCETH Spacecraft Event Time, Hour - Binary hours since the beginning of the current year.
3	5-6	MRETS	SCETS Spacecraft Event Time, Seconds- Binary seconds since the beginning of the current hour.
4	7-8	MRETMS	SCETMS Spacecraft Event Time, Binary - Binary milliseconds.
5	9-10	MRETYR	SCETYR Spacecraft Event Time, Year- Two least significant digits of year, e.g. 78
6	11	MRFLAG	SCEF*16+FDSCFF where SCEF is Spacecraft Event Time Flag 0000 input by NORT file 1111 input by EDRPROC FDSCFF is FDSC Correction Flag which indicates that the FDSC has been corrected. (1=corrected, 0=OK) Bit 3 Spare Bit 2 MOD216 Bit 1 MOD60 Bit 0 Line Count
6	12	MRG181	Group 18 ID
7	13-14	MRM216	Mod2**16 counter from the Flight Data System (FDS). Increments each 48 minutes.
8	15-16	MRM60	Mod60 counter from the FDS. Increments each 48 seconds
9	17-18	MRLINE	Line counter from the FDS. Increment every 60 ms.
10	19-20	MRS1	S1 LECP Status Word 1, MSB=1 if missing.
11	21-22	MRS2	S2 LECP Status Word 2, MSB=1 if missing
12	23-24	MRS3	S3 LECP Status Word 3, MSB=1 if missing
13	25-26	MRS4	S4 LECP Status Word 4, MSB=1 if missing
14	27-28	MRS5	S5 LECP Status Word 5, MSB=1 if missing
15	29-30	MRS6	S6 LECP Status Word 6, MSB=1 if missing
16	31-32	MRMOT	LECP Motor Position - contains the motor position at the end of the current record. = 1 if unknown, otherwise Bits 3-1 Motor position (0-7) for sector (1-8) Bit 0 Centered flag, =1 if centered.
17	33-34	MRNMOV	Number of motor steps. Turn arounds in sectors 8 and 1 or 2 are considered to be 2 steps. = -1 if unknown.
18	35-36	MRLOGT	Log. Amp. Temperature in Deg C*128. = -9999 if unknown
19	37-38	TTEMP	LECP Telescope Temperature-contains the telescope temperature (degrees C) x 128. TTEMP= -9999 if the temperature is unknown
20	39-40	MRMSI	Basic accumulation interval in .01 sec.
21	41-42	MRQ	Quality of frame = number of good groups
22	43-44	MRRT	Record type 1 MRT 2 MPT Header 4 SEDR 10 Eng 11 Cal
23	45-46	MRVER	Version number of S1P program used to process this data.
24	47-48	MRALT	LEPT/LEMPA - In GS-3 alternating mode this word indicates which logics are being read out in the current record: -1 = unknown 0 LEPT 1 LEMPA
25	49-50	MRRAB	Redundancy A/B - indicates which of the LECP redundant data systems is being used. -1 unknown 0 A 1 B
26	51-52	MRPRO	Processing status 0 S1P 1 S2P, motor corrections applied
27	53-54	MRMOR	Motor period in seconds with some special cases: -1 Not known 0 Not decoded 9000 Encounter Stow (Vgr 2 Jupiter enc) 10000 Stowed or commanded to position Values implemented in software include 5, 6, 24, 48, 144, 192, 360 (6 min), 384
28-36	55-72	MRS5S	Nine S5's for Near Encounter only
37-38	73-76		Spare

List of Header Block Contents (old ftecs)

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 R4 words + 122 I2 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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Return to Fundamental Technologies Home Page.

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

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	Mod216 Spacecraft Clock Word-contains the spacecraft Mod216 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