Method for obtaining high range resolution with continuous transmission frequency

Claim 1

IN A SYSTEM FOR ACHIEVING HIGH RANGE RESOLUTION; MEANS FOR PROPAGATING A FREQUENCY MODULATED PERIODICALLY VARYING SIGNAL IN A GIVEN MEDIUM VARYING IN FREQUENCY BETWEEN A FIRST AND SECOND VALUE; AN OSCILLATOR FOR PRODUCING A FREQUENCY GREATER THAN THE DIFFERENCE BETWEEN THE FIRST AND SECOND VALUES OF THE PROPAGATED SIGNAL; FIRST MIXER MEANS FOR MIXING THE OUTPUTS OF SAID PROPAGATING MEANS AND SAID OSCILLATOR TO PRODUCE A TRANSLATED FREQUENCY; MEANS FOR RECEIVING SIGNALS REFLECTED FROM OBJECTS IN THE MEDIUM; SECOND MIXER MEANS FOR MIXING TOGETHER SAID TRANSLATED FREQUENCY AND SAID RECEIVED SIGNALS TO PRODUCE OUTPUT FREQUENCIES REPRESENTATIVE OF RANGE TO OBJECTS IN THE MEDIUM; FIRST FILTER MEANS FOR PASSING SIGNALS REPRESENTATIVE OF ROUND TRIP TRANSIT TIME TO OBJECTS IN SAID MEDIUM; SECOND OSCILLATOR MEANS FOR GENERATING A DESIRED FREQUENCY; THIRD MIXER MEANS FOR MIXING THE OUTPUTS OF SAID SECOND OSCILLATOR MEANS AND SAID FIRST FILTER MEANS FOR ELIMINATING SAID SIGNALS REPRESENTATIVE OF ROUND TRIP TRANSIT TIME AND PRODUCING SIGNALS REPRESENTATIVE OF RANGE TO OBJECTS IN THE MEDIUM; SECOND FILTER MEANS FOR PASSING FREQUENCIES IN THE OUTPUT OF SAID SECOND MIXER MEANS REPRESENTING RANGE TO OBJECTS IN THE MEDIUM; AND MEANS FOR LINEARLY MIXING THE OUTPUT OF SAID SECOND FILTER MEANS WITH THE OUTPUT OF SAID THIRD MIXER REPRESENTATIVE OF RANGE TO OBJECTS IN SAID MEDIUM TO PRODUCE OUTPUT FREQUENCIES REPRESENTING RANGE TO OBJECTS IN SAID MEDIUM.