Fundamental TechnologiesVoyager LECP Pages |
Table 1. 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 |
||||
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, datum 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 |
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Last modified 5/4/05, Tizby Hunt-Ward
tizby@ftecs.com