Frequency modulated range and velocity measuring instrument

Claim 1

A RANGE AND VELOCITY MEASURING INSTRUMENT COMPRISING, A MICROWAVE GENERATOR, AN OSCILLATOR PROVIDING A PRESELECTED FREQUENCY OUTPUT FOR FREQUENCY MODULATING THE MICROWAVE GENERATOR OUTPUT, A MICROWAVE DUPLEXER MEANS RESPONSIVE TO THE FREQUENCY MODULATED MICROWAVES FOR APPLYING SAID WAVES TO AN ANTENNA ARRANGED TO RADIATE SAID FREQUENCY MODULATED WAVES TOWAD A TARGET AND FOR SIMULTANEOUSLY APPLYING THE DOOPLER SHIFTED MICROWAVES REFLECTED BY THE TARGET AND RECEIVED BY THE ANTENNA TO FIRST AND SECOND SIGNAL PRECESSING CHANNELS FOR EXTRACTING RANGE AND VELOCITY INFORMTION, RESPECTIVELY, FROM THE DOPPLER SHIFTED WAVES, SAID FIRST SIGNAL PROCESSING CHANNEL FOR DETERMINING RANGE INCLUDING, MEANS FOR MIXING THE SIGNAL RECEIVED FROM THE DUPLEXER WITH A SIGNAL HAVING A FREQUENCY EQUAL TO THE ZERO ORDER SIDEBAND FREQUENCY OF THE SIGNAL RECEIVED FROM THE DUPLEXER WHEREBY THE RECEIVED SPECTRUM IS FOLDED AT THE MICROWAVE GENERATOR FREQUENCY AND CORRESPONDING PAIRS OF SIDEBANDS ARE SPACED EQUALLY ABOVE AND BELOW MULTIPLES OF THE MODULATING FREQUENCY, MEANS FOR PASSING ONE PAIR OF SIDEBANDS ONLY, A SQUARE LAW FREQUENCY DOUBLING CIRCUIT RESPONSIVE TO THE PASSED SIDEBAND PAIR FOR PROVIDING A LARGE SPIKE OF ENERGY AT TWICE THE AVERAGE FREQUENCY OF THE SAID PASSED SIDEBAND PAIR, FREQUENCY MULTIPLYING MEANS FOR MULTIPLYING THE MODULATING FREQUCNEY TO RENDER IT EQUAL IN FREQUENCY TO THE SAID SPIKE, AND MEANS FOR COMPARING THE