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

Record Structure for Cruise 5A Mode

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