Voyager In Space

 

Galaxy Banner Image
VOYAGER

Voyager LECP Data Analysis Handbook

 

Data File Descriptions

 

Master Rate (Tape) File Descriptions

 

Definitions; General Information

 

DESCRIPTION OF MASTER RATE TAPE HEADER VARIABLES

 

(See also MRT Record Header for CR5A.)

 

INDEX

ITEM

VARIABLE

 TYPE

DESCRIPTION
1

1

SCID

 I*1

Spacecraft Identification - identifies the spacecraft transmitting this data 
1=Voyager 1 
0=Voyager 2
 

2

MODE

 I*1

Contains the space telemetry mode 
0116=CR2
0216=CR3
0316=CR4
0416=CR5
0516=CR6
0716=CR1
0A16=FE
0816=NE
1816=CR5A
2916=CR5A
Spacecraft Event Time - contains the Greenwich Mean of the first bit of the first spacecraft minor frame used in this LECP major frame.
2

3

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).
3

4

SCETS

 I*2

Spacecraft Event Time, Sec - is the number of seconds since the beginning of the current hour.
4

5

SCETMS

 I*2

Spacecraft Event Time, Milliseconds - is the number of milliseconds since the beginning of the current second.
5

6

SCETY

 I*2

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

7

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

SCETF

 I*1

Spacecraft Event Time Flag - indicates that the spacecraft clock has been corrected in some manner in the J.P.L. processing. Bit 0 indicates correction to the line count (0=none, 1=corrected), bit 1 the MOD60 counter and bit 2 the MOD216counter.
7

9

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.
8

10

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.
9

11

LC

 I*2

Spacecraft Line Counter - contains the line count for the first minor frame in the current record. LC ranges from 1 to 80010 and is incremented every 0.06 seconds.
10

12

S1

 I*2 LECP Status Word 1 , 10 bits, right justified
11

13

S2

 I*2 LECP Status Word 2 , 10 bits, right justified
12

14

S3

 I*2 LECP Status Word 3 , 10 bits, right justified
13

15

S4

 I*2 LECP Status Word 4 , 10 bits, right justified
14

16

S5

 I*2 LECP Status Word 5 , 10 bits, right justified
15

17

S6

 I*2 LECP Status Word 6 , 10 bits, right justified
16

18

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.
17

19

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.
18

20

LATEMP

 I*2

LECP Log. Amp. Temperature - contains the log. amp. temp. (oC x 128. LATEMP= -9999 if the temperature is unknown.
19

21

TTEMP

 I*2

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

22

BAI

 I*2

Basic Accumulation Interval - contains the number of milliseconds of accumulation times for the group 1 and 2 logics.
21

23

NG

 I*2

Number of Groups - indicates the number of rate groups included in the current major frame.
22

24

MRT/MPT

 I*2

Master Rate Tape/Master Pulse Tape - indicates whether this record is a master rate or master pulse record.
01 = Master Rate Record, 02 = Master Pulse Record
23

25

VN

 I*2

Version Number - indicates the version of S1P used to process the current data.
24

26

LEPT/LEMPA

 I*2 Indicates data type in record.
-1=Don't know
0=LEPT
1=LEMPA
"Normal"
NE Logics in G3, 5, 6, 7, 9, 15
25  

RED.A/B

 I*2 Redundancy A or B logic flag.
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
27  

Stepping
Rate Sec.

 I*2 Motor stepping rate

 

*originally Table B2

 

 

Next: LECP Status Words

 

Return to MRT main page.

Return to Data File Descriptions main page. 

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


Updated 8/9/19, Cameron Crane

VOYAGER 1 ELAPSED TIME

--:--:--:--
Days: Hours: Minutes: Seconds

*Since official launch
September 5, 1977, 12:56:00:00 UTC

VOYAGER 2 ELAPSED TIME

--:--:--:--
Days: Hours: Minutes: Seconds

*Since official launch
August 20, 1977, 14:29:00:00 UTC

QUICK FACTS

Manufacturer: Voyagers 1 and 2 were built in the Jet Propulsion Laboratory in Southern California.

Mission Duration: 40+ years have elapsed for both Voyager 1 and Voyager 2 (both are ongoing).

Destination: Their original destinations were Saturn and Jupiter. Their current destination is interstellar space.