ECOM-721 DATA FORMAT

Record 1

Tape: 9-Track, 1600 bpi, Computer: Interdata 70, Character Type: Internal BCD

FILE 1 (Header)

Card Column Contents Example
1-4 Vehicle ID '78-1'
5-12 User ID 'ECOM-721'
13-15 Data Format '32 K'
16-23 Analog Tape Number 'COOK0123'
24-27 Rev Number '0123'
28-31 Year '1978'
32-35 Day of Year '0246'
36-41 UT Seconds Start of Data '034560'
42-47 UT Seconds End of Data '035600'
48-55 Data Rate, msec/frame '32.00140'
56-61 Scan Counts '000050'
Records 2-11 (Optional)
1-80 Comments
End of File

Scan File

Description Bit (16 bit words)
UT (Bin seconds & milliseconds) 0-15 1st 4 words
Scan bit (0 = out of sync; 1 = in sync) 0 Word 5
VTCW (MSB) 1-15
VTCW (LSB) 0-15 Word 6

Repeat words 1-6 for 120 scan times. There will be 720 16-bit words per record.

Incomplete records will be zero filled.

End of File.

Event File

Description	Bit (16 word)
UT (Bin Sec and Millisec)	0-15	1st 4 words
VTCW (MSB)	0-15	word 5
VTCW (LSB)	0-15	word 6
Event	0-7	word 7
Status	0-15	word 7

Position Event Event No. Status

MF63W54B2 D/N Flag 1 0=Day
1=Night

MF111W47B1 HV1 On/Off 2 0=Off
1=On

MF111W47B6 HV2 On/Off 3 0=Off
1=On

MF111W55B1 Photon On/Off 4 0=Off
1=On

ECOM Scientific
Data HVMON Test 6 0=Out of Rng
1=In Rng

ECOM Scientific
Data Spectrum Cnts Test 7 0=Overflow
1=In Rng

Repeat words 1-17 for 120 event times. There will be 840 16-bit words per record.

Incomplete records will be zero filled.

End of File.

EM FILE

This file contains the output of the EM and is used as input to the OM. The following card images will be in this file:

First Card: Contains the time origin of the state ephemeris

Datum Card Column Format

Year 10 I10

Day 21 I11

Hour 32 I11

Minute 45 I13

Number of Vectors 57 I12

Sequence Number 80 I2

Second Card: Contains the ephemeris state position vector

Datum Card Column Units Format
Time 17 sec FI3.6
X-Position 37 ft F20.6
Y-Position 57 ft F20.6
Sequence Number 80 -- I2

Third Card: Contains the ephemeris state velocity vector

Datum Card Column Units Format

X-Velocity component 37 ft/sec F20.6

Y-Velocity component 57 ft/sec F20.6

Z-Velocity component 77 ft/sec F20.6

Sequence Number 80 ft/sec I2

The second and third cards are repeated for each ephemeris vector in the POSVEL array.

Datum	Card Column	Units	Format
"OUTPUTS VALID FOR SPAN"	23	--	literal
Start Time	36	sec	F13.6
End Time	52	sec	F13.6
No. of Day Phases	75	--	I1
Sequence Number	80	--	I2

Next Card: contains no more data applicable to entire time span

Datum	Card Column	Units	Format
"AVE SPIN RATE"	15	--	literal
OMBAR	28	rad/sec	F13.6
"RAD/SEC"	36	--	literal
"ETA1"	42	--	literal
Spin axis Euler angle n1	53	rad	F10.6
"ETA2"	58	--	literal
Spin axis Euler angle n2	69	rad	F10.6
Sequence Number	80	--	I2

Next Card: contains solar roll and sun elevation angles

Datum	Card Column	Units	Format
Time	14	sec	F13.6
SOLROL	24	rad	F10.6
SUNEL	34	rad	F10.6
SOLVEC (X)	46	--	F12.8
SOLVEC (Y)	58	--	F12.8
SOLVEC (Z)	70	--	F12.8
Sequence Number	80	--	I2

The above card is output either two or four times (at the end points of each day phase).

Next Card(s): contain(s) the curve fit coefficients for nu

Datum	Card Column	Format
"NU"	3	literal

Same as card for PHI

The above cards, containing the data for the first orbit phase, are repeated for each subsequent orbit phase. After all curve fit coefficients have been output, the following cards for the commandable control coils are output. Note that these cards are not sequence numbered.

First Card

Datum	Card Column	Format
"PRECISION COIL TABLE"	22	literal
"TIME/VALUE"	34	literal

Next Card(s): contain(s) the precision coil values

Datum	Card Column	Format
TIME	28	F13.6
VALUE	48	F20.6

Next Card:

Datum	Card Column	Format
"SPIN COIL TABLE"	22	literal
"TIME/VALUE"	34	literal

Next Card:

Same as precision coil values

Next Card: contains identification of the coefficients

Datum	Card Column	Format
"SET"	4	literal
Set Number	6	I1
"OF"	9	literal
Number of Sets	11	I1
"ORDER"	19	literal
Order of Fit for theta and (unreadable)	23	I2
"NUORDER"	30	literal
Order of fit for v	33	I2
"START TIME"	44	literal
Value of Start Time	--	--
Sequence Number	80	I2

The above card is repeated at the start of each set of coefficients

Datum	Card Column	Format
"PHI"	4	literal
Coefficient	22	F17.10
Coefficient	39	F17.10
Coefficient	56	F17.10
Coefficient	73	F17.10
Sequence Number	80	I2

The above card may be repeated. (The number of coefficients actually output depends on the order they fit.)

Next Card(s): contain(s) the curve fit coefficients for PSI

Datum	Card Column	Format
"PSI"	4	literal
Same as card for PSI

ECOM-721

File B

16-bit word number	Description
1,2	Time corresponding to time value in record A only in floating point
3,4	SP RA GEIS
5,6	SP DEC GEIS
7,8	SP R GEIS
9,10	SP X GSE
11,12	SP Y GSE
13,14	SP Z GSE
15,16	SP X MAG
17,18	SP Y MAG
19,20	SP Z MAG
21,22	SP LAT GEOS
23,24	SP LONG GEOS
25,26	SOLCU RA GEIS
27,28	SOLOCU DEC GEIS
29,30	SOLOCU LAT GEOS
31,32	SOLOCU LONG GEOS
33,34	SOLOCU A SSC
35,36	SOLOCU E SSC
37,38	Magnitude of local magnetic field (LMACF)
39,40	LMAGFU A SSC
41,42	LMAGFU E SSC
43,44	LMAGFU X MAG
45,46	LMAGFU Y MAG
47,48	LMAGFU Z MAG
49,50	Time value corresponding to spectrum data 1 in record A
51,52	LOSU RA GEIS
53,54	LOSU DEC GEIS
55,56	LOSU X GSE
57,58	LOSU Y GSE
59,60	LOSU Z GSE
61,62	LOSU LAT GEOS
63,64	LOSU LONG GEOS
65,66	LOSU A SSC
67,68	LOSU E SSC

End of File

The above information (words 49-68)is prepared for each of the 10 spectrums in record type A. Note the time value is the critical record causing the computed quantities to change.

Vector Names

Vector Abbreviation Name

SP Spacecraft Position

SOLOC Sun Locations

LOS Line of Sight

LMAGF Local Magnetic Field

U (Placed after any of the above to indicate unit vector)

Coordinate System

Names
(S used to indicate spherical coordinates rather than Cartesian)

Abbreviation Name

GEI(S) Geocentric Equatorial Indicator

GEO(S) Geographic

MAG Geomagnetic

GSE Geocentric Solar Elliptic

SSC Spherical Spacecraft Centered

Coordinate System

Abbreviation Name

RA Right Ascension

DEC Declination

F Radius

X X Coordinate

Y Y Coordinate

Z Z Coordinate

LAT Latitude

LONG Longitude

A Azimuth Angle

E Elevation Angle

Cartesian coordinates (X,Y,Z) defined explicitly for some systems implicate by rotation matrices for other systems.

Linear measurements will be in meters.

Angular measurements will be in degrees

Magnitude of magnetic field vector in ____

Unit vectors are dimensionless.

ECOM-721

16-Bit Word #	Description for Record Type A
1-4	UT (Binary Seconds and Milliseconds)
5-132	Spectrum Data 1- (every 4th word of frame 1 starting with words 5, every 4th word of frames 2-6 starting with words 1 and ending with word 1 of frame 7)
133-260	Spectrum Data 2 (same as spectrum data 1 only using data from frame 7-13)
261-388	Spectrum Data 3 (same as spectrum data 1 only using data from frame 13-19)
389-516	Spectrum Data 4 (same as spectrum data 1 only using data from frame 19-25)
517-644	Spectrum Data 5 (same as spectrum data 1 only using data from frame 25-31)
645-772	Spectrum Data 6 (same as spectrum data 1 only using data from frame 31-37)
773-900	Spectrum Data 7 (same as spectrum data 1 only using data from frame 37-43)
901-1028	Spectrum Data 8 (same as spectrum data 1 only using data from frame 43-49)
1029-1156	Spectrum Data 9 (same as spectrum data 1 only using data from frame 49-55)
1157-1284	Spectrum Data 10 (same as spectrum data 1 only using data from frame 55-61)
1285-1300	Photometer Data ECOM (1-16) (one measurement per word)
1301	Grating Position ECOM
1302	Pls Hgt 1 ECOM
1303	Pls Hgt 2 ECOM
1304	ECOM HV MON
1305	ECOM Flags (w111 F 47)
1306	ECOM Flags (w111 F 55)
1307	D/N Flag (w63F54)
1308	Zero FIll

Last Updated May 29, 1998 by Janine Lyn

Card Column	Contents	Example
1-4	Vehicle ID	'78-1'
5-12	User ID	'ECOM-721'
13-15	Data Format	'32 K'
16-23	Analog Tape Number	'COOK0123'
24-27	Rev Number	'0123'
28-31	Year	'1978'
32-35	Day of Year	'0246'
36-41	UT Seconds Start of Data	'034560'
42-47	UT Seconds End of Data	'035600'
48-55	Data Rate, msec/frame	'32.00140'
56-61	Scan Counts	'000050'
Records 2-11 (Optional)
1-80	Comments
End of File

Description	Bit (16 bit words)
UT (Bin seconds & milliseconds)	0-15	1st 4 words
Scan bit (0 = out of sync; 1 = in sync)	0	Word 5
VTCW (MSB)	1-15	Word 5
VTCW (LSB)	0-15	Word 6

Position	Event	Event No.	Status
MF63W54B2	D/N Flag	1	0=Day 1=Night
MF111W47B1	HV1 On/Off	2	0=Off 1=On
MF111W47B6	HV2 On/Off	3	0=Off 1=On
MF111W55B1	Photon On/Off	4	0=Off 1=On
ECOM Scientific Data	HVMON Test	6	0=Out of Rng 1=In Rng
ECOM Scientific Data	Spectrum Cnts Test	7	0=Overflow 1=In Rng

Vector Abbreviation	Name
SP	Spacecraft Position
SOLOC	Sun Locations
LOS	Line of Sight
LMAGF	Local Magnetic Field
U	(Placed after any of the above to indicate unit vector)

Abbreviation	Name
GEI(S)	Geocentric Equatorial Indicator
GEO(S)	Geographic
MAG	Geomagnetic
GSE	Geocentric Solar Elliptic
SSC	Spherical Spacecraft Centered

Abbreviation	Name
RA	Right Ascension
DEC	Declination
F	Radius
X	X Coordinate
Y	Y Coordinate
Z	Z Coordinate
LAT	Latitude
LONG	Longitude
A	Azimuth Angle
E	Elevation Angle