Device for regulating the frequency of an oscillator substantially in coincidence with variations in the natural frequency of a resonance circuit

Claim 1

A RADAR TRANSCEIVER DEVICE COMPRISING A TRANSMITTING TUBE HAVING PERIODS OF EXCITATION AND NON-EXCITATION AND A TURNABLE CIRCUIT FOR DETERMINING THE CARRIER FREQUENCY OF THE TRANSMITTED RADAR PULSES, A MODULATOR CONNECTED TO SAID TUBE FOR PRODUCING A TRANSMITTING PULSE THROUGH SAID TUBE, MEANS APPLYING AN EXCITATION PULSE TO SAID MODULATOR CAUSING RADAR PULSES TO BE TRANSMITTED HAVING A FREQUENCY DEPENDING UPON THE INSTANT OF EXCITATION, A RECEIVER MEANS RESPONSIVE TO THE ECHO TIME INTERVAL OF SAID TRANSMITTED RADAR PULSE FOR MEASURING THE DISTANCE FROM SAID TRANSCEIVER DEVICE TO A TARGET, SAID RECEIVER MEANS COMPRISING A VARIABLE FREQUENCY LOCAL OSCILLATOR, MEANS CONNECTING SAID OSCILLATOR TO SAID TRANSMITTING TUBE, CONTROL MEANS COUPLED TO THE TURNABLE CIRCUIT OF SAID TUBE AND TO SAID OSCILLATOR FOR PROVIDING A CONTROL SIGNAL REPRESENTATIVE OF THE FREQUENCY DIFFERENTIAL BETWEEN SAID TUBE AND SAID OSCILLATOR, MEANS APPLYING SAID CONTROL SIGNAL TO SAID OSCILLATOR WHEREBY THE FREQUENCY OF SAID OSCILLATOR VARIES SYNCHRONOUSLY WITH THE VARYING FREQUENCY OF SAID TUBE IN NON EXCITED CONDITION, STORAGE MEANS CONNECTED TO SAID CONTROL MEANS, AND MEANS FOR APPLYING SAID EXCITATION PULSE TO SAID STORAGE MEANS, SAID STORAGE MEANS HOLDING SAID CONTROL SIGNAL AT A VALUE EQUAL TO THE LEVEL OF SAID CONTROL SIGNAL AT THE MOMENT OF EXCITATION FOR A DURATION DEPENDENT UPON THE SAID ECHO TIME INTERVAL.