Frame Synchronization in Satellite-Switched Tdma

摘要

Frame synchronization in three abstract network configurations is examined: (1) a large number of low traffic Earth stations distributed among from 4 to 32 spot beam zones; (2) a small number of high traffic Earth stations; and (3) a combination of (1) and (2). A hierarchical open loop synchronization scheme was adopted. The ground segment consists of a unique word detector, frame timing unit, and satellite phase error detector. In the satellite, a circuit corrects the frame clock and broadcasts a unique word beacon. Overall cold start acquisition time is 23 sec.