NOAA KLM User's Guide

Appendix A.1

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APPENDIX A.1: The TBUS-1 Code Form

U.S. NATIONAL PRACTICE CODE TBUS-1 FOR SATELLITE EPHEMERIS PREDICT MESSAGE (DAYLIGHT DESCENDING SATELLITES)

TBUS 1 KWBC
APT PREDICT
MMDDSS

PART I

0NrNr NrNr 0DrDr HrHr 0mrmr srsrOrLo Lololo Tmmss LLo Lololo

N4N4N4N4 H4 H4h4h4 s4s4 Q4Lo Lololo

N8N8N8N8 G8 H8h8h8 s8s8 Q8Lo Lololo

N12N12N12N12 H12 H12h12h12s12s12 Q12Lo Lololo

NIGHT PART II

02a02a02Q02 LaLalaLo Lolo 04a04a04Q04 Lala LoLolo

06a06a06Q06 La LalaLoLo lo 08a08a08Q08 LaLalaLo Lolo ........

...and continuing north, at two-minute intervals, to day/night terminator in N. Hemisphere.

NIGHT PART III

02a02a02Q02 La LalaLoLo lo 04a04a04Q04 LaLa1aLo Lolo

06a06a06Q06 La LalaLoLol o 08a08a08Q08 LaLa1aLo Lolo

...and continuing south, at two-minute intervals, to day/night terminator in S. Hemisphere.

DAY PART II

...begins near day/night terminator in N. Hemisphere, two minutes after last position given in NIGHT PART II, continuing south at two-minute intervals and ending close to and north of the equator, repeating the code form:

.....mmammammQmm LaLa1oLo Lolo .....

DAY PART III

...begins two minutes after last position given in DAY PART II. First two code groups give satellite time, altitude, octant, and latitude/longitude of the first position south of the equator; following groups give the same information at two-minute intervals until spacecraft reaches day/night terminator in S. Hemisphere; repeating code form:

......mmammammQmm LaLalaLo Lolo ........

PART IV

AAAAAAAAA BBBBB CCCCCCCCCCCC DDEEFFGGHHIIIII JJJJJJJ
KKKKKKKK LLLLLLLL MMMMMMMM NNNNNNNN OOOOOOOO PPPPPPPP
QQQQQQQQ RRRRRRRR SSSSSSSSSS TTTTTTTTTT UUUUUUUUUU
VVVVVVVVV WWWWWWWWW XXXXXXXXX YYYYYYYYY ZZZaaabbb cccc
dddddddddd eeeeeeeee fffffffff ggggggggg hhhhhhhh
iiiiii jjjjjj kkkkkk llllll mmmmmm nnnnnn oooooo
APT TRANSMISSION FREQUENCY XXX.XX MHZ
HRPT TRANSMISSION FREQUENCY XXXX.XX MHZ
BEACON (DSB) TRANSMISSION FREQUENCY XXX.XX MHZ
APT DAY X/X APT NIGHT X/X
DCS CLK TIME YR/DA/TIM XXXX XXX XXXXX.XXX
(ADDITIONAL PLAIN LANGUAGE REMARKS WHEN NEEDED)


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