Pulse type radar altimeter

Claim 1

AN ALTIMETER COMPRISING: TRANSMITTING MEANS FOR TRANSMITTING RADIO FREQUENCY ENERGY PULSE TO A REFLECTING OBJECT; RECEIVER MEANS FOR RECEIVING SAID ENERGY PULSE AFTER SAID PULSE HAS REFLECTED FROM SAID OBJECT, SAID RECEIVER INCLUDING MEANS FOR AMPLIFYING THE REFLECTED PULSE AND PRODUCING A VIDEO OUTPUT PULSE; SAWTOOTH GENERATING MEANS ENERGIZED IN SYNCHRONISM WITH THE OUTPUT OF SAID TRANSMITTER MEANS AND PRODUCING A SUBSTANTIALLY LINEAR SAWTOOTH OUTPUT SIGNAL HAVING A PREDETERMINED SLOPE; COMPARATOR MEANS; MEANS CONNECTING THE SAWTOOTH OUTPUT OF SAID SAWTOOTH GENERATING MEANS TO SAID COMPARATOR MEANS; DOUBLE INTEGRATING MEANS; MEANS CONNECTING THE OUTPUT OF SAID DOUBLE INTEGRATING MEANS TO SAID COMPARATOR MEANS; MEANS CONNECTING THE OUTPUT OF SAID DOUBLE INTEGRATING MEANS TO SAID SAWTOOTH GENERATING MEANS WHEREBY THE SLOPE OF THE SAWTOOTH OUTPUT SIGNAL IS MADE VARIABLE AS A FUNCTION OF THE OUTPUT OF SAID DOUBLE INTEGRATING MEANS; GATE GENERATING MEANS; MEANS CONNECTING THE OUTPUT OF SAID COMPARATOR MEANS TO SAID GATE GENERATING MEANS; COINCIDENT GATE MEANS; MEANS CONNECTING SAID COINCIDENT GATE MEANS TO THE RECEIVER VIDEO PULSE OUTPUT, SAID COINCIDENT GATE MEANS FURTHER HAVING AN ENABLING INPUT; MEANS CONNECTING THE OUTPUT OF SAID GATE GENERATING MEANS TO SAID ENABLING INPUT OF SAID COINCIDENCE GATE MEANS SO AS TO ENABLE SAID COINCIDENCE GATE MEANS DURING THE LEADING EDGE OF THE RECEIVER VIDEO PULSE OUTPUT; AND MEANS CONNECTING THE OUTPUT OF SAID COINCIDENT GATE MEANS TO THE INPUT OF SAID DOUBLE INTEGRATING MEANS.