H - Electricity – 04 – J
Patent
H - Electricity
04
J
363/11
H04J 3/06 (2006.01) H04B 7/185 (2006.01)
Patent
CA 1037167
TITLE "SYNCHRONISATION SYSTEM" ABSTRACT A Time-Division Multiple Access (TDMA) synchronisation system for a satellite relay system is provided by designating one of the ground stations a "Reference" station and arranging for a sinusoidal signal transmitted from the reference station to be received by other ground stations via the satellite and compared with their own sinusoidal synchronisation signals after transmission to and from the satellite. The sinusoidal signal from the "Reference" station uses only a small proportion of the bandwidth of a satellite global beam transponder. Most of the traffic is transmitted to one or more spot beam transponders of the satellite. Each station derives from its symbol-rate clock a pulse indicating the start of each TDMA frame and a local synchronisation sinusoidal signal at the frame repetition frequency. The phase of this local sinusoidal signal is such that its positive- going zero crossings coincide with the frame-start pulses. These local sinusoidal signals transmitted and received back through the satellite using high-index frequency modulation are -1- compared in phase with the received "Reference" station sinusoidal signal. The phase difference signal derived from the comparison of the local and reference sinusoidal signals is used to adjust the station's transmit frame timing to achieve synchronisation with the reference station frame timing.
208686
Hodson Kevin
Jefferis Alan K.
LandOfFree
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