Device for transmitting high frequency pulses, preferably adapted for a radar equipment

Claim 1

A RADAR SYSTEM COMPRISING A SOURCE OF FIRST HIGH FREQUENCY OSCILLATIONS HAVING TUNED OSCILLATION FREQUENCY DETERMINING MEANS, A MODULATOR CONNECTED TO ENERGIZE SAID SOURCE OF FIRST OSCILLATIONS, THE SAID SOURCE OF FIRST OSCILLATIONS COMPRISING MEANS FOR CONTINUOUSLY VARYING THE TUNING FREQUENCY OF SAID TUNED MEANS, A SOURCE OF SECOND OSCILLATIONS, MEANS CONNECTED TO COMPARE THE FREQUENCY OF SAID SECOND OSCILLATIONS WITH THE UNEXCITED RESONANT FREQUENCY OF SAID TUNED MEANS TO DERIVE A SIGNAL WHEN A PREDETERMINED RELATIONSHIP EXISTS BETWEEN SAID UNEXCITED RESONANT FREQUENCY AND THE FREQUENCY OF SAID SECOND OSCILLATIONS, MEANS FOR APPLYING SAID SIGNAL TO SAID MODULATOR TO MOMENTARILY ENERGIZE SAID SOURCE OF FIRST OSCILLATIONS, MEANS FOR TRANSMITTING SAID FIRST OSCILLATIONS, MEANS FOR RECEIVING SAID FIRST OSCILLATIONS REFLECTED FROM A TARGET AND FOR MIXING SAID REFLECTED OSCILLATIONS WITH SAID SECOND OSCILLATIONS, MEANS RESPONSIVE TO SAID SIGNAL FOR HOLDING THE FREQUENCY OF SAID SECOND OSCILLATIONS SUBSTANTIALLY CONSTANT FOR A PREDETERMINED TIME SUBSEQUENT THE OCCURRENCE OF SAID SIGNAL AND FOR CONTINUOUSLY VARYING THE FREQUENCY OF SAID SECOND OSCILLATOR AT A RATE FASTER THAN THE VARIATION OF TUNING FREQUENCY OF SAID TUNED MEANS BETWEEN THE TERMINATION OF SAID PREDETERMINED TIME AND THE NEXT OCCURRENCE OF SAID SIGNAL.