Pulse synchronizing apparatus

Claim 1

A radar apparatus comprising: means for providing a continuous first train of pulses having a predetermined repetition frequency; first coding means for deriving from said first train of pulses a first digital signal having a repetitive first binary code; means for transmitting radar pulses having a selected time duration and synchronized with each occurrence of a first state of said first digital signal; means for receiving radar signals and producing a video signal including components representative of returned radar pulses delayed relative to said transmitted radar pulses; signal means for providing a second digital signal having said first binary coding; control means for providing a command signal as a function of said video signal in which the relative polarity of said video signal is (i) non-inverted during time intervals synchronized with a first state of said second digital signal, and (ii) inverted during time intervals synchronized with a second state of said second digital signal; and said signal means including delay means for variably delaying said second digital signal in response to said command signal to bring said second digital signal into synchronism with said returned radar pulses.

Claim 8

An apparatus comprising: means for providing a first clock signal at a first frequency; first divider means for dividing said first clock signal by N thereby generating a first pulse train; first coding means for deriving from said first pulse train a second pulse train having a repetitive code; delay means responsive to a command signal for providing a second clock signal derived from said first clock signal, said second clock signal being substantially identical to said first clock signal but which is delayed in time in accordance with said command signal; a second divider means for dividing said second clock signal by N thereby generating a third pulse train substantially identical to said first pulse train but which is delayed with respect thereto; second coding means for deriving from said third pulse train a fourth pulse train having said repetitive code; means for receiving a fifth pulse train having pulses in relation to pulses of said second pulse train which said pulses of said fifth pulse train are delayed relative to said second pulse train in accordance with an unknown time delay; gating means connected to receive said fifth pulse train and actuated in synchronisms with said fourth pulse train to gate through said gating means said fifth pulse train in opposite senses in accordance with a condition of said fourth pulse train; and control means for providing said command signal in accordance with a function of said transmitted fifth pulse train through said gating means, said control means operative to selectively advance and retard said fourth pulse train with respect to said first pulse train to bring said fourth pulse train in synchronism with said fifth pulse train.

Claim 9

An apparatus comprising: means for providing a first clock signal at a first frequency; first divider means for dividing said first clock signal by N thereby generating a first pulse train; first coding means for deriving from said first pulse train a second pulse train having a repetitive code; delay means responsive to a command signal for providing a second clock signal derived from said first clock signal, said second clock signal being substantially identical to said first clock signal but which is delayed in time in accordance with said command signal; a second divider means for dividing said second clock signal by N thereby generating a third pulse train substantially identical to said first pulse train but which is delayed with respect thereto; second coding means for deriving from said third pulse train a fourth pulse train having said repetitive code; means for receiving a fifth pulse train having pulses in relation to pulses of said second pulse train which said pulses of said fifth pulse train are delayed relative to said second pulse train in accordance with an unknown time delay; gating means connected to receive said fifth pulse train and actuated in synchronisms with said fourth pulse train to gate through said gating means said fifth pulse train in opposite senses in accordance with a condition of said fourth pulse train; and control means for providing said command signal in accordance with a function of said transmitted fifth pulse train through said gating means, said control means operative to selectively advance and retard said fourth pulse train with respect to said first pulse train to bring said fourth pulse train in synchronism with said fifth pulse train.