Long range radar ranging system

Claim 1

IN A RADAR SYSTEM, A RANGE MEASURING SYSTEM COMPRISING IN COMBINATION, A PULSE REPETITION FREQUENCY GENERATOR MEANS SEQUENTIALLY OPERABLE AT FIRST AND SECOND PULSE REPETITION FREQUENCIES, SAID PULSE GENERATOR MEANS PRODUCING RECURRENT OUTPUT REFERENCE PULSES FOR KEYING A RADAR TRANSMITTER, VARIABLE TIME DELAY MEANS COUPLED TO SAID PULSE GENERATOR MEANS, SAID VARIABLE TIME DELAY MEANS PRODUCING DELAYED RECURRENT OUTPUT PULSES AT THE FREQUENCY OF SAID PULSE GENERATOR, MEANS COUPLED TO SAID VARIABLE TIME DELAY MEANS FOR VARYING PUT PULSES AND SAID REFERENCE OUTPUT PULSES, RANGE INDICATING MEANS COUPLED TO SAID VARIABLE TIME DELAY MEANS, AND SELECTOR MEANS COUPLED BETWEEN SAID VARIABLE TIME DELAY MEANS AND SAID PULSE GENERATOR MEANS, SAID SELECTOR MEANS ALTERNATELY SWITCHING THE PULSE REPETITION FREQUENCY OF SAID PULSE GENERATOR BETWEEN SAID FIRST AND SECOND PULSE REPETITION FREQUENCIES AS THE INTERVALS OF RANGE AS INDICATED BY SAID RANGE INDICATING MEANS INCREASED BY PREDETERMINED FIXED INCREMENTS.