Pulse doppler range tracking system

Claim 1

IN A PULSE DOPPLER RADAR SYSTEM, A SOURCE OF ENERGY PULSES HAVING A FIRST PULSE REPETITION FREQUENCY, A SOURCE OF ENERGY PULSES HAVING A SECOND PULSE REPETITION FREQUENCY MEANS FOR SELECTIVELY TRANSMITTING ENERGY PULSES AT SAID FIRST OR SECOND REPETITION FREQUENCY, APPARATUS CONNECTED TO SAID SOURCES OF ENERGY PULSES FOR PRODUCING A SOURCE OF ENERGY PULSES HAVING A FUNDAMENTAL PULSE REPETITION FREQUENCY EQUAL TO THE DIFFERENCE BETWEEN SAID FIRST AND SECOND REPETITION FREQUENCIES, A TIME MODULATOR COUPLED TO SAID APPARATUS AND RESPONSIVE TO A CONTROL CURRENT FOR PRODUCING SPACED OUTPUT PULSES HAVING A PULSE REPETITION FREQUENCY EQUAL TO THE SAID FUNDAMENTAL FREQUENCY AND A PHASE POSITION RELATIVE TO OUTPUT PULSES FROM SAID APPARATUS WHICH IS A FUNCTION OF SAID CONTROL CURRENT, A FREQUENCY MULTIPLIER FOR INCREASING THE REPETITION FREQUENCY OF PULSES FROM SAID TIME MODULATOR TO SAID FIRST REPETITION FREQUENCY, A SECOND FREQUENCY MULTIPLIER FOR INCREASING THE REPETITION FREQUENCY OF PULSES FROM SAID TIME MODULATOR TO SAID SECOND REPETITION FREQUENCY, A SOURCE OF OSCILLATORY VOLTAGE, MODULATOR MEANS ADAPTED TO BE COUPLED TO THE OUTPUT OF ONE OF SAID FREQUENCY MULTIPLIERS FOR JITTERING THE PHASE OF THE OUTPUT PULSES FROM SAID FREQUENCY MULTIPLIER AS A FUNCTION OF SAID OSCILLATORY VOLTAGE, MEANS FOR COMPARING THE PHASE OF ENERGY PULSES REFLECTED FROM A DISTANT OBJECT WITH THE JITTERED OUTPUT OF SAID MODULATING MEANS TO PRODUCE AN ALTERNATING CURRENT