WORD Content Chan. Bits Frame Sequence
1 Halfword 1 : Continuity flags
Halfword 2 : Day of year
2 Millisecond of day
3 Time quality flags :
Byte 1 = Sequence 0 - 3
Byte 2 = Sequence 4 - 7
Byte 3 = Sequence 8 - 11
Byte 4 = Sequence 12 - 15
4 Data quality flags (each quarter sequence)
Byte 1 = Sequence 0
Byte 2 = Sequence 1
Byte 3 = Sequence 2
Byte 4 = Sequence 3
5 Data quality flags : sequence 4 - 7
6 Data quality flags : sequence 8 - 11
7 Data quality flags : sequence 12 - 15
8 Pseudo-sequence counter (sequence 0)
9 S/C clock (sequence 0)
10 S/C clock (sequence 1)
11 S/C clock (sequence 2)
. " .
. " .
. " .
24 " 15)
25-28 APP (16,1-15) (one APP per byte)
29-32 APP (32,17-31) or APP (48,33-47) (one APP per byte)
33-40 DPP A2 (5-36) (one channel per byte)
41-48 Spare
49-51 DPP A3 (1-24) (one channel per byte)
52-54 Spare
55 OA sun time (floating point-seconds) 8,9 1-9 4 4 S.S.1
56 Earth width (floating point-seconds) 14,15 1-8 4 4 S.S.1
57 Earth time (floating point-seconds) 12,13 1-8 4 4 S.S.1
58 Spin period (floating point-seconds) 10,11 1-8 4 4 S.S.1
WORD Content Chan. Bits Frame Sequence
59 LED (DS) Halfword 1 : frame 3 4 1-2 0
Halfword 2 : frame 11
60 " " 1
. . . .
. . . .
74 " " 15
75 LED (A) Halfword 1 : frame 3 reverse 9 5-8 0
Halfword 2 : frame 11 reverse 10 1-6
76 " " 1
. . . .
. . . .
90 . " 15
91 LED (B) Halfword 1 : frame 3 10 7-8 0
Halfword 2 : frame 11 11 1-8
92 " " 1
. . .
. . .
106 " " 15
107 MED (D) Halfword 1 : frame 3 reverse 12 1-8 0
Halfword 2 : frame 11 reverse 13 1-2
108 " " 1
. . . .
. . . .
122 . " 15
123 MED (E) Halfword 1 : frame 3 13 3-8 0
Halfword 2 : frame 11 14 1-4
124 " " 1
. . .
. . .
138 " " 15
139 MED (DS) Halfword 1 : frame 3 4 3-4 0
Halfword 2 : frame 11 14 5-8
140 " " 1
. . "
. . "
154 " " 15
155 MED (F) Halfword 1 : frame 3 reverse 15 1-8 0
Halfword 2 : frame 11 reverse
156 " " 1
. . "
. . "
170 " " 15
171 MED-R1 (LR12a3-1) 5 1-8 4 0&8
6 1-4
Halfword 1 : seq. 0 reverse
Halfword 2 : seq. 8 reverse
172 MED-R2 (LR12a3-2) 6 5-8 4 0&8
7 1-8
Halfword 1 : seq. 0 reverse
Halfword 2 : seq. 8 reverse
173 MED-R3 (LR12a3-5) 5 1-8 4 1&9
6 1-4
Halfword 1 : seq. 1 reverse
Halfword 2 : seq. 9 reverse
174 MED-R4 (LR12a3-8) 9 5-8 4 1&9
10 1-4
Halfword 1 : seq. 1 reverse
Halfword 2 : seq. 9 reverse
175 MED-R5 (LR12a3-9) 5 1-8 8 4&12
6 1-4
Halfword 1 : seq. 4 reverse
Halfword 2 : seq.12 reverse
176 MED-R6 (LR12a3-13)
Halfword 1 : seq. 0 reverse 5 1-8 8 0&8
6 1-4
Halfword 2 : seq. 8 reverse
177 MED-R7 (LR12a3-17) 5 1-8 4 5&13
6 1-4
Halfword 1 : seq. 5 reverse
Halfword 2 : seq.13 reverse
178 MED-R8 (LR12a3-21) 5 1-8 12 0&8
6 1-4
Halfword 1 : seq. 0 reverse
Halfword 2 : seq. 8 reverse
179 MED-R9 (LR12a3-26) 6 5-8 12 4&12
7 1-4
Halfword 1 : seq. 4 reverse
Halfword 2 : seq.12 reverse
180 LED-R1 (LR12a3-12) 9 5-8 8 4&12
10 1-8
Halfword 1 : seq. 4 reverse
Halfword 2 : seq.12 reverse
181 LED-R2 (LR12a3-16) 9 5-8 8 0&8
10 1-8
Halfword 1 : seq. 0 reverse
Halfword 2 : seq. 8 reverse
182 LED-R3 (LR12a2-22) 6 5-8 12 0&8
7 1-8
Halfword 1 : seq. 0 reverse
Halfword 2 : seq. 8 reverse
183 VLED-R1 (LR12a2-9) 5 1-8 10 1&5
6 1-4
Halfword 1 : seq. 1 reverse
Halfword 2 : seq. 5 reverse
184 VLED-R1 (LR12a2-9) 5 1-8 10 9&13
6 1-4
Halfword 1 : seq. 9 reverse
Halfword 2 : seq.13 reverse
185 VLED-R2 (LR12a2-13) 5 1-8 2 2&6
6 1-4
Halfword 1 : seq. 2 reverse
Halfword 2 : seq. 6 reverse
186 VLED-R2 (LR12a2-13) 5 1-8 2 10&14
6 1-4
Halfword 1 : seq.10 reverse
Halfword 2 : seq.14 reverse
187 VLED-R3 (LR12a2-17) 5 1-8 10 2&6
6 1-4
Halfword 1 : seq. 2 reverse
Halfword 2 : seq. 6 reverse
188 VLED-R3 (LR12a2-17) 5 1-8 10 10&14
6 1-4
Halfword 1 : seq.10 reverse
Halfword 2 : seq.14 reverse
189 VLED-R4 (LR12a2-21) 5 1-8 2 3&7
6 1-4
Halfword 1 : seq. 3 reverse
Halfword 2 : seq. 7 reverse
190 VLED-R4 (LR12a2-21) 5 1-8 2 11&15
6 1-4
Halfword 1 : seq.11 reverse
Halfword 2 : seq.15 reverse
191 VLED-R5 (LR12a2-25) 5 1-8 10 3&7
6 1-4
Halfword 1 : seq. 3 reverse
Halfword 2 : seq. 7 reverse
192 VLED-R5 (LR12a2-25) 5 1-8 10 11&15
6 1-4
Halfword 1 : seq.11 reverse
Halfword 2 : seq.15 reverse
193 Halfword 1:MED-S(IN) sector 1 reverse 0 1-8 2 0
1 1-2
Halfword 2:MED-S(IN) sector 2 reverse 1 3-8 2 0
2 1-4
194 Halfword 1:MED-S(IN) sector 3 reverse 2 5-8 2 0
3 1-6
Halfword 2:MED-S(IN) sector 4 reverse 3 7-8 2 0
4 1-8
195 Halfword 1:MED-S(IN) sector 5 reverse 11 1-8 2 0
12 1-2
Halfword 2:MED-S(IN) sector 6 reverse 12 3-8 2 0
13 1-4
196 Halfword 1:MED-S(IN) sector 7 reverse 13 5-8 2 0
14 1-6
Halfword 2:MED-S(IN) sector 8 reverse 14 7-8 2 0
15 1-8
197 Halfword 1:VLED-S(IN) sector 1 reverse 0 1-8 10 0
1 1-2
Halfword 2:VLED-S(IN) sector 2 reverse 1 3-8 10 0
2 1-4
198 Halfword 1:VLED-S(IN) sector 3 reverse 2 5-8 10 0
3 1-6
Halfword 2:VLED-S(IN) sector 4 reverse 3 7-8 10 0
4 1-8
199 Halfword 1:VLED-S(IN) sector 5 reverse 11 1-8 10 0
12 1-2
Halfword 2:VLED-S(IN) sector 6 reverse 12 3-8 10 0
13 1-4
200 Halfword 1:VLED-S(IN) sector 7 reverse 13 5-8 10 0
14 1-6
Halfword 2:VLED-S(IN) sector 8 reverse 14 7-8 10 0
15 1-8
201-400 Same as above for page 1
401-600 Same as above for page 2
601-800 Same as above for page 3
801-879 Orbit/attitude data corresponding to nearest minute preceding
the album start time
880-882 Zeros
DPP Locations
WORD BYTE PAGE DPP# SNAPSHOT
33 1 0 A2, 5-8 0
2 0 A2, 5-8 1
3 0 A2, 5-8 2
4 0 A2, 5-8 3
34 1 0 A2, 9-12 0
2 0 A2, 9-12 1
3 0 A2, 9-12 2
4 0 A2, 9-12 3
35 1 0 A2, 13-16 0
2 0 A2, 13-16 1
3 0 A2, 13-16 2
4 0 A2, 13-16 3
36 1-4 0 A2, 17-20 0-3
37 1-4 0 A2, 21-24 0-3
38 1-4 0 A2, 25-28 0-3
39 1-4 0 A2, 29-32 0-3
40 1 0 A2, 33-36 0
2 0 A2, 33-36 1
3 0 A2, 33-36 2
4 0 A2, 33-36 3
49 1 0 A3, 1-4 0
2 0 A3, 1-4 2
3 0 A3, 5-8 0
4 0 A3, 5-8 2
50 1 0 A3, 9-12 1
2 0 A3, 9-12 3
3 0 A3, 13-16 0
4 0 A3, 13-16 2
51 1 0 A3, 17-20 1
2 0 A3, 17-20 3
3 0 A3, 21-24 0
4 0 A3, 21-24 2
233-240 Same as words 33-40 for page 1
249-251 Same as words 49-51 for page 1
433-440 Same as words 33-40 for page 2
449-451 Same as words 49-51 for page 2
633-640 Same as words 33-40 for page 3
649-651 Same as words 49-51 for page 3
ORBIT/ATTITUDE DATA (All numbers are IBM floating point)
WORD Content
801 Day of year, time of orbit data in the record
802 Milliseconds of day
803 Longitude (deg.) satellite position in geocentric coordinates
804 Latitude (deg.)
805 Longitude (deg.) satellite position in magnetic coordinates
806 Latitude (deg.)
807 R (earth radii) a geomagnetic coordinate of the satellite position,
C.U.L.
808 r, radial distance of the satellite from the
center of the earth (km.)
809 GSEx Satellite position in Geocentric Solar ecliptic coordinates(km.)
810 GSEy
811 GSEz
812 GSMx Satellite position in Geocentric Solar
magnetospheric Coordinates (km.)
813 GSMy
814 GSMz
815 GSEx Moon position in Geocentric Solar ecliptic coordinates(km.)
816 GSEy
817 GSEz
818 GSMx Moon position in Geocentric Solar magnetospheric
Coordinates (km.)
819 GSMy
820 GSMz
821 GEIx Satellite position, in Geocentric equatorial inertial(km.)
822 GEIy
823 GEIz
824 GEIx Sun position in Geocentric equatorial inertial(A.U.)
825 GEIy
826 GEIz
827 Longitude, Sub-solar point in geomagnetic coordinates(deg.)
828 Latitude
829 Distance from the satellite to the moon (km.)
830 Distance parallel to the x-axis from the satellite to the moon(km.)
831 1st row, 1st column, geocentric solar energetic to geocentric solar
magnetospheric transformation matrix.
832 1st row, 2nd column
833 1st row, 3rd column
834 2nd row, 1st column
835 2nd row, 2nd column
836 2nd row, 3rd column
837 3rd row, 1st column
838 3rd row, 2nd column
839 3rd row, 3rd column
840 1st row, 2nd column, geocentric equatorial inertial-to-geocentric
solar ecliptic transformation matrix.
841 1st row, 2nd column
842 1st row, 3rd column
843 2nd row, 1st column
844 2nd row, 2nd column
845 2nd row, 3rd column
846 3rd row, 1st column
847 3rd row, 2nd column
848 3rd row, 3rd column
849 Right ascension, Satellite position in celestial inertial(deg.)
850 Declination
851 Right ascension, Velocity vector in inertial(deg.)
852 Declination
853 Magnitude of the velocity (km./sec.)
854 L, McIlwain parameter (earth radii)
855 B, Magnetic field strength (Gamma)
856 B/B0, Ratio of the magnetic field strength at the
satellite-to-the-field strength at the invarient equator
857 Satellite-earth-sun angle, Lsep(deg.)
858 Satellite-earth-moon angle(deg.)
859 Right ascension, magnetic vector in celertial inertial(deg.)
860 Declination
861 Longitude, Sub-solar point in geocentric equatorial inertial(deg.)
862 Latitude
863 GSEx, theoretical geomagnetic field in geocentric solar ecliptic
coordinatesIin gamma)
864 GSEy
865 GSEz
866 Type of data item indicator:
1 = regular satellite data item
2 = ascending node crossing data item
3 = North point data item
4 = descending node data item
5 = south point data item
6 = sunlight entrance data item
7 = sunlight exit data item
867 Date of data (YR MO DAY)
868 Longitude, Geodetic satellite position (deg.)
869 Latitude
870 Height above spheroid (Km.)
871 Ascending node crossing number (pass number)
872 Year of data (YR)
873-875 Zero fill for spares
876 Delta time between time of Ephemeris item and next previous sun
pulse which stopped OA - ST counter(seconds)
877 Spin period (seconds)
878 Right ascension, Spin vector in celestial inertial(deg.)
879 Declination
NOTES:
Longitude is positive east of Greenwich and negative west of Greenwish
(-180- to + 180-)
North latitude is positive and south latitude is negative (--90' to +90')
Date of data (word number 867) equals day + 100 (months + year (100))
Example: February 10, 1967 at 2 hours U.T. is recorded as 670210 in word
867, 41 in day count (word 301), 7200000 in milliseconds of day
(word 802), and 67 in year of data (word 872).
The format of each page of data under the relaxed ground rules is shown
in the attached table. Data should be blocked 1 album (4 pages) per
physical record, so that the first page of each record is page 0 of the
album. It should be noted that the format is given in terms of 360 relative
word locations. Since IBM 360 words are 32 bits in length, the bit patterns
of each data line will not occupy an even number of tape characters. For
example, the first data item of each record (day of year for page 0) will
occupy the first 5 characters plus the first 2 bits of the 6th. The second
data item (milliseconds of day for page 0) will occupy the last 4 bits of
the 6th character, the 7th through 10th characters, and the first 04 bits of
the 11th.
Floating point numbers
All floating point numbers on the tape should be in IBM 360 format as follows:
Each 32-bit number consists of a sign bit, a 7-bit characteristic, and
a 24-bit fraction:
-
S Characteristic Fraction
bit 0 1 7 8 31
The fraction (bits 8-31) is expressed inm hexadecimal digists. The radix
point of the fraction is assumed to be immediately to the left of the
high-order fraction digit.
The characteristic fraction indicates the power of 16 by which to multply
the fraction. It is treated as an excess 64 number with a range from -64
tp 63, corresponding to binary values of 0 - 127.
to 63, corresponding to binary values of 0 - 127.
Both positive and negative numbers have true fractions. A sign bit of 0
or 1 indicates that the number is positive or negative, respectively.
Reverse
Those data items labeled "reverse" should have their bit orders reversed
and right-justified in their respective halfwords. For example, each LED(A)
halfword (360 words 91-106) should contain bits 6-1 of channel 10 followed
by bits 8-5 of channel 9 right-justified.
Explanatory Notes
Fill Data
Padding is done on a sequence basis, that is, a telemetry sequence will
contain either all fill or none. Data in padded sequences will appear as
zero. No album will be written with all four pages padded, however as
little as one sequence of data could appear in a record.
A spacecraft (S/C) clock readout is provided every sequence. If a sequence
is fill, its corresponding S/C clock will be zero.
The pseudo-sequence count and the time (in day of year and milliseconds of
day) are provided every pa.:,e and correspond to sequence 0 of that page.
If sequence 0 is padded (and'the entire page is not missing), the
the pseudo-sequence count and time given are the extrapolated values that
would be expected at the start of sequence 0. This may result in the
extrapolated pseudo-sequence overlapping a previous value.
If an entire page is missing, all data including time, pseudosequence count,
S/C clocks, and data quality flags are zero.
Continuity Flags
20 = 0 indicates no fill data in paae
21 = 0 indicates no time discontinuity following-
Quality Flags
Time and Data Quality Flaas are 2-bit integers as follows:
Value Time Quality Data Quality
0 Analog, time unverified Excellent (PE < 10 to the power -6)
1 Analog time verified by Good (PE < 10 -4)
S/C clock
2 Analog time in error - Fill
S/C clock used
3 Time put with fill data Undetermined
computed
Time Quality Flags occur once per sequence (2 bits per sequence) The flags
for 4 sequences are packed in one byte.
Data Quality Flags are provided every 1/4 sequence. The flags for one sequence
are packed in a byte as follows:
0 1 2 3 4 5 6 7
Frames Frames Frames Frames
0-3 4-7 8-11 12-15
Spacecraft Clock
The Spacecraft Clock appears as an integer, of which the least significant
bit (20) counts at the sequence rate. The main frame count and the data
rate bits have been dropped. All complementation, bit reversal and
rearrangement has been done. The result is a 22-bit counter that is
incremented every sequence (approximately 1.27841 seconds) and recycles in
approximately 62 days.
Bits 2121 = Telemetry sequence 2'32 2 = Telemetry snapshot 2124 - Telemetry page
221 ... 21 - Telemetry album
In the case or low bit rate (400 BPS), redundant bits (a5a6) have been
removed so that the clock counts normally. This results in a 20-bit counter
that is incremented every sequence (approximately 5.11364 seconds) and
recycles in approximately 62 days.
The clock value has been time corrected where n&cessary and possible.
APP's (Analog Performance Parameters)
Each APP appears as a one byte integer representing count values from. 0 to 255.
APP's 16, 1-15 appear every pa-e
APP's 32, 17-31 appear only on even pages (page 0 and page 2 as determined
by the S/C clock).
APP's 48, 33-47 appear only on odd pages (1 and 3).
DPP's(Digital Performance Parameters)
-------------------------------------
All DPP's are provided for each page. DPP's A2 occur once per snapshot for
a total of 4 each per page. DPP's A3 occur once per 2 snapshots for a total
of 2 each per page.
Each group of 8 significant bits represents 4 DPP's as follows:
DD3@@ IkD3@@
Thus for DPP A2, 5-8: D4 = DPP A2-8, D3 = DPP A2-7, = DPP A2-6, @ = DPP A2-5.