Multi-dimensional navigation system with minimum frequency requirement

Claim 1

A HETERODYNE PHASE COMPARISON NAVIGATION SYSTEM HAVING A MOBILE STATION AND AT LEAST TWO SPACED APART FIXED STATIONS, MEANS FOR TRANSMITTING A NAVIGATION SIGNAL AT FREQUENCY F1 FROM THE MOBILE STATION, MEANS FOR TRANSMITTING FROM A FIRST FIXED STATION A SIGNAL AT FREQUENCY F2 WHICH IS A MULTIPLE N OF F1 + A, MEANS FOR TRANSMITTING FROM A SECOND FIXED STATION A SIGNAL AT FREQUENCY F3 WHICH IS THE MULTIPLE N OF F1 + B, MEANS FOR RECEIVING F1 AT THE FIRST STATION AND THERE HETERODYNING SAME WITH NF1 + A TO PRODUCE A SIGNAL OF FREQUENCY A, MEANS FOR RELAYING A TO THE MOBILE STATION, MEANS FOR RECEIVING F1 AT THE SECOND FIXED STATION AND THERE HETERODYNING SAME WITH NF1 + B TO PRODUCE A SIGNAL OF FREQUENCY B, MEANS FOR RELAYING B TO THE MOBILE STATION, MEANS FOR RECEIVING F2 AND F3 AT THE MOBILE STATION, MEANS AT THE MOBILE STATION UTILIZING THE FACTOR N TO BRING F1 AND F2 TO WITHIN VALUE A OF EACH OTHER FOR THE CASE WHERE THE MOBILE STATION REMAINS A GIVEN DISTANCE FROM THE FIRST FIXED STATION, MEANS AT THE MOBILE STATION UTILIZING THE FACTOR N TO BRING F1 AND F3 TO WITHIN VALUE B OF EACH OTHER FOR THE CASE WHERE THE MOBILE STATION REMAINS A GIVEN DISTANCE FROM THE SECOND FIXED STATION, MEANS AT THE MOBILE STATION FOR APPLYING A AS RELAYED THERETO TO ONE INPUT OF A FIRST PHASE ANGLE MEASURING DEVICE AND A AS GENERATED AT THE MOBILE STATION TO THE OTHER INPUT OF THE FIRST PHASE ANGLE MEASURING DEVICE, MEANS AT THE MOBILE STATION FOR APPLYING B AS RELAYED THERETO TO ONE INPUT OF A SECOND PHASE ANGLE MEASURING DEVICE AND B AS GENERATED AT THE MOBILE STATION TO THE OTHER INPUT OF THE SECOND PHASE ANGLE MEASURING DEVICE, THE MEANS AT THE MOBILE STATION FOR GENERATING A AND B INCLUDING MEANS TO HETERODYNE F2 AND F3 AS RECEIVED WITH A DISTINCT SIGNAL AT A FREQUENCY F4 WHICH IS DIFFERENT IN VALUE THAN F2 OR F3 AND GREATER THAN A OR B AND SEPARATING BY FILTER MEANS THE DIFFERENCE FREQUENCY BETWEEN F2 AND F4 FROM THE DIFFERENCE FREQUENCY BETWEEN F3 AND F4, WHEREIN EACH OF F1, F2, F3, A AND B ARE DIFFERENT FREQUENCIES AND N MAY BE 1 OR ANY OTHER NUMBER.