Clock recovery system for TDMA satellite communication system

Claim 1

A clock signal recovery system for TDMA satellite communication system in which a transmitting earth station transmits periodically modulated burst signals which are synchronized with each other in both frequency and phase and a receiving earth station demodulates that burst signal by using the recovered clock signal comprising: an input terminal for receiving TDMA bust signals; a burst clock recovery means to obtain burst clock from the received burst signal; a clock control means to generate the recovered clock by controlling a local clock oscillator according to stored frequency and/or phase information and said burst clock, a frequency and/or phase memory means for storing frequency and/or phase information of an output of said clock control means for more than two frame periods, said frequency and/or phase memory means including a processor means for providing a signal of the average of the frequencies and/or phase information stored in memory, a decision circuit for regenerating received burst signal by using the recovered clock signal, a first output terminal coupled with output of said decision circuit to provide regenerated burst signal, a synchronization detection circuit coupled with said output terminal for indicating establishment of clock synchronization of a clock signal after receiving predetermined pluality of bursts from the same transmitting earth station, a second output terminal coupled with output of said synchronization detection circuit.