NOAA KLM User's Guide

Appendix A.5

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APPENDIX A.5: Decoding Exercise

Table A.5-1. Decoding exercise of sample APT Predict (TBUS) Bulletin from Section A.4.
Line from TBUS Explanation
TBUS2 KWBC 271900
TBUS2 Bulletin heading--identifies bulletin for satellite northbound in daylight
KWBC Bulletin source--Washington, D.C. Communications Center
271900 27 -Day of the month (27th)
1900 -Bulletin time (1900 UTC)
APT PREDICT Bulletin identifier
022737 0227 - Date for which bulletin applies, Feb. 27
37 - Satellite identifier (Table A-1)
NOAA 12 Plain language satellite identifier
PART I Identifies reference orbit information and the equator crossing time and equator crossing longitude for the fourth, eighth and twelfth orbits after the reference orbit.
05271 02718 05148 01022 T0115 L2531
05271 0 - Group indicator
5271 - Reference orbit number
02718 0 - Group indicator
27 - Day of month of equator crossing
18 - Hour
05148 0 - Group indicator
51- Minute
48 - Seconds (equator crossing 18:51:48 UTC)
01022 0 - Octant 0 (0 to 90W degrees), N. Hemisphere
1022 - 010.22W (equator crossing)
T0115 T - Group indicator
0115 - Orbital period 101 minutes 15 seconds
L2531 L - Group indicator
2531 - Nodal longitudinal increment 25.31 degrees
52750 13652 11149
52750 13652 5275 - Orbit number 5275 (4th orbit after reference orbit)
013652 - Time (01:36:52Z) of ascending node for orbit 5275
11149 1 - Octant 1 (90W to 180 degrees)
1149 - 111.49W (equator crossing for orbit 5275 in octant 1)
52790 82156 24723 Decoded in same manner as previous line of data
52831 50700 34596 Decoded in same manner as previous line of data
NIGHT PART II Satellite altitude and subpoint coordinates at two-minute intervals beginning at the day/night terminator in the N. Hemisphere and continuing southward toward the equator.
02810 070117 04820 141133 ..........
02810 02 - Minute 02 after northbound equator crossing
81 - Spacecraft altitude 810 km
0 - Octant 0 (0 - 90W degrees) N. Hemisphere
070117 070 - Latitude 7.0N
117 - Longitude 11.7E
04820 04- Minute 04 after equator crossing
82 - Spacecraft altitude 820 km
0 - Octant 0 (0 - 90W degrees) N. Hemisphere
141133 141 - Latitude 14.1N
133 - Longitude 13.3E
Remainder of NIGHT PART II decoded in same manner. Data continues at 2 minute intervals.
NIGHT PART III Satellite altitude and subpoint coordinates at two-minute intervals south of the equator on the descending side of the orbit.
02815 070086 04815 141070 ........
02815 02 - Minute 02 after Northbound equator crossing
81 - Spacecraft altitude 810 km
5 - Octant 5 (0 - 90W degrees) S Hemisphere
070086 070 - Latitude 07.0S
086 - Longitude 08.6E
04815 04 - Minute 04 after equator crossing
81 - Spacecraft altitude 810 km
5 - Octant 5 (0 -90W degrees) S Hemisphere
141070 141 - Latitude 14.1S
070 - Longitude 7.0E
Remainder decoded in same manner. Data continues at 2-minute intervals from first point South of equator to Southern terminator.
DAY PART II Contains satellite altitude and subpoint coordinates at two-minute intervals after time of Northbound (ascending) equator crossing.
32831 649795 34832 582752 .......
32831 32 - Minute 32 after Northbound equator crossing
83 - Spacecraft altitude 830 km
1 - Octant 1 (90W to 180W degrees) N. Hemisphere
649795 649 - Latitude 64.9N
795 - Longitude 079.5W
34832 34 - Minute 34 after Northbound equator crossing
83 - Spacecraft altitude 830 km
2 - Octant 2 (90E to 180E) N. Hemisphere
582752 582 - Latitude 058.2N
752 - Longitude 75.2W
Remainder of DAY PART II decoded in same manner. Data for DAY PART II are continuous at 2-minute intervals from equator North to Northern terminator.

DAY PART III

Satellite altitude and subpoint coordinates at two-minute intervals south of the equator. Satellite Northbound in the Southern hemisphere (points are plotted Southward from the equator).
52817 048560 54817 118544 ......
52817 52 - Minute 52 before Northbound equator crossing
81 - Spacecraft altitude 810 km
7 - Octant 7 (90E to 180E degrees) S. Hemisphere
048560 048 - Latitude 04.8S
560 - Longitude 056.0W
54817 54 - Minute 54 after equator crossing
81 - Spacecraft altitude 810 km
7 - Octant 7 (90E to 180E degrees) S. Hemisphere
118544 118 - Latitude 11.8S
544 - Longitude 54.4W
Remainder of DAY PART III decoded in same manner
PART IV Indicator -- orbital elements, transmission frequencies, and remarks follow.

AAAAAAAAA

1991 032A 1991-032A International designator for NOAA-12
BBBBB 35260 revolution 35260
CCCCCCCCCCCC 058012410488 058.012410488 days
DDEEFFGGHHIIIII 980227001752266 98--1998 year
02-02 months
27-27 days
00-00 hours
17-17 minutes
52266--52.266 seconds
JJJJJJJ 1611059 161.1059 degrees
KKKKKKKK 01012050 101.2050 minutes
LLLLLLLL 01012668 101.2668 minutes
MMMMMMMM 00124135 0.00124135 no units
NNNNNNNN 27260918 272.60918 degrees
OOOOOOOO 06938332 69.38332 degrees
PPPPPPPP 09853018 98.53018 degrees
QQQQQQQQ 08737459 87.37459 degrees
RRRRRRRR 07191220 7191.220 km
SSSSSSSSSS P025340217 +2534.0217 km
TTTTTTTTTT P067357065 +06735.7065 km
UUUUUUUUUU P000000000 +0.0000 km
VVVVVVVVV P01033198 +1.033198 km/sec
WWWWWWWWW M00387576 -0.387576 km/sec
XXXXXXXXX P07361891 +7.361891 km/sec
YYYYYYYYY 003003246 0.03003246 m2/kg
ZZZaaabbb 094096008 094--94 x 10-7 W/m2
096--96 x 10-7 W/m2
008-- 8 x 10-5 gauss
cccc 9449 0.9449 no units
dddddddddd 0000500000 0.0005000000 m2/kg
eeeeeeeee M00312884 - 3.12884 degrees/day
fffffffff P00096864 +0.96864 degrees/day
ggggggggg P00512228 +5122.28 degrees/day
hhhhhhhh 26827739 268.27739 degrees East longitude
iiiiii 123195 12-month,
31-date,
95-year
jjjjjj M00100 -0.100 seconds
kkkkkk 020998 02-month,
09-date,
98-year
llllll M00100 -0.100 seconds
mmmmmm 020198 02-month,
01-date,
98-year
nnnnnn M00002 -2 milliseconds/day
oooooo 000000 Date of next clock correction is unknown.
PLAIN LANGUAGE PART OF MESSAGE:

APT 137.50 MHZ, HRPT 1698.0 MHZ, BCN DSB 136.77 MHZ. APT DAY/NIGHT
CH 2,4/3,4. VIS CH 2 /0.725 TO 1.0/ AND IR CH 4 /10.5 TO 11.5/XMTD
DURING S/C DAY. IR CH 3 /3.55 TO 3.93/ AND IR CH 4 /10.5 TO 11.5/
XMTD DURING S/C NIGHT. DCS CLK YR/DAY/TIME 1994 185 69079.016
LAST TIP CLK CORR 12/31/95 CLK ERR AFTER CORR MINUS 0.1 SEC.
CLK ERR AS OF 02/09/98 MINUS 0.1 SEC. ERR RATE AS OF 02/01/98
MINUS 2 MS/DAY(ESTIMATED). NO CLK CORRECTION SCHEDULED.

NNNN NNNN Indicates end of message

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