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IP.com Disclosure Number: IPCOM000009525D
Original Publication Date: 1999-Sep-01
Included in the Prior Art Database: 2002-Aug-29

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Robert Foncannon


On the current Iridium@ program, satellite to satellite communications is accomplished via four half duplex 12.5 MBPS burst rate K-Band RF crosslinks. Two of these crosslinks point fore and aft (In Plane Links) and two right and left (Cross Plane Links). Transmit and receive timing for all crosslinks are slaved together to a constellation wide time base known as "Iridium@ Time" (IT), which is maintained to keep each Space Vehicle (SV) time base to within +/- 12.5 usec of each other. The basic frame rate for these links is 9 msec (4.5 receive and 4.5 transmit). This timing was selected to allow the maximum possible in plane link capaci- ty. With the nominal spacing between satellites in a plane, there is roughly 13.5 msec of path delay.