NOAA KLM User's Guide

Appendix A.2

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APPENDIX A.2: The TBUS-2 Code Form

U.S. NATIONAL CODE TBUS-2 FOR SATELLITE EPHEMERIS PREDICT MESSAGE
(DAYLIGHT ASCENDING SATELLITES)

TBUS 2 KWBC
APT PREDICT
MMDDSS

PART I

0NrNrNrNr 0DrDrHrHr 0mrmrsrsr QrLoLoLoLo Tmmss LLoLoLol0
N4N4N4N4H 4 H4m4m4 s4s4 Q4Lo LoLoLo
N8N8N8N8 H8 H8m8m8 s8s8 Q8Lo LoLo10
N12N12N12N12 H12 H12m12m12 s12s12 Q12Lo LoLoLo

DAY PART II

02a02a02Q02 La LalaLoLo Lo 04a04a04Q04 LaLalaLo LoLo
06a06a06Q02 La LalaLoLo Lo 08a08a08Q08 LaLalaLo LoLo .........
...and continues north, at two-minute intervals, to day/night terminator in N. Hemisphere.

DAY PART III

02a02a02Q02 La LalaLoLo Lo 04a04a04Q04 LaLalaLo LoLo
06a06a06Q02 La LalaLoLo Lo 08a08a08Q08 LaLalaLo Lolo .........
...and continuing south, at two-minute intervals, to day/night terminator in S. Hemisphere.

NIGHT PART II

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

... mmammammQmm LaLalaLo LoLo ........

NIGHT PART III

...beginning two minutes after last position given in NIGHT 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 Lo1o ........

PART IV

... identical to the TBUS-1 code form


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