Aerial navigation system with beacon identification

Claim 1

AN OMNI-RANGE BEACON SYSTEM FOR INTERROGATING A CRAFT AND DETERMINING THE LOCATION OF SAID CRAFT AND TRANSMITTING ROTATING DIRECTION INDICATING SIGNALS IN A RADIATION PATTERN FROM WHICH AZIMUTH INDICATIONS OF SAID CRAFT CAN BE PRODUCED IN A BEACON STATION COMPRISING AT THE BEACON STATION A GENERATOR FOR PRODUCING CONTINUOUS WAVE FURTHER SIGNALS, THE FREQUENCY OF WHICH IS A HARMONIC OF SAID DIRECTION INDICATING SIGNALS PLUS ADDITIONAL CYCLES, SAID FREQUENCY BEING IDENTIFIED WITH SAID BEACON, MEANS FOR TRANSMITTING SAID FURTHER SIGNALS SUBSTANTIALLY OMNI-DIRECTIONALLY FROM SAID BEACON, AN INDICATING DEVICE AT SAID BEACON SYNCHRONIZED WITH SAID FURTHER SIGNALS, MEANS ON SAID CRAFT FOR RECEIVING AND DETECTING SAID DIRECTION INDICATING SIGNALS AND SAID FURTHER SIGNALS AT THE TIME SAID RADIATION PATTERN IS ALIGNED IN A PREDETERMINED PATTERN WITH RESPECT TO SAID CRAFT, MEANS FOR GENERATING A PAIR OF SIGNALS FROM SAID FURTHER SIGNALS AND SAID DIRECTION INDICATING SIGNALS HAVING A SPACING THEREBETWEEN EQUAL IN TIME TO THE RECIPROCAL OF THE FREQUENCY OF SAID FURTHER SIGNALS, MEANS TO TRANSMIT SAID PAIR OF SIGNALS AND MEANS AT SAID BEACON TO RECEIVE SAID PAIR OF SIGNALS AND MEANS RESPONSIVE TO SAID PAIR OF SIGNALS FROM SAID CRAFT AND TO SAID FURTHER SIGNALS FOR PRODUCING ON SAID CRAFT AND TO SAID INDICATION OF THE DISTANCE AND AZIMUTH OF SAID INTERROGATED CRAFT RELATIVE TO SAID BEACON.