Harmonic phase comparison direction determination system

Claim 1

RADIO NAVIGATION SYSTEM OPERATIVE BY THE DOPPLER PRINCIPLE HAVING MEANS AT A RECEIVER STATION TO COMPARE IN PHASE A DIRECTION-DEPENDENT SIGNAL WITH A REFERENCE SIGNAL TO DETERMINE THE DIRECTION FROM A TRANSMITTER STATION, INCLUDING, IN ORDER TO OBTAIN A MORE ACCURATE DIRECTION DETERMINATION, MEANS AT THE RECEIVER STATION TO COMPARE A HARMONIC OF THE DIRECTION-DEPENDENT SIGNAL WITH A HARMONIC OF THE REFERENCE SIGNAL, THE LATTER HARMONIC BEING AN EXACT MULTIPLE OF THE FORMER HARMONIC, FURTHER INCLUDING AT A TRANSMITTER STATION OF RING OF ANTENNAS ENERGIZED BY A FIRST TRANSMITTER AND SECOND TRANSMITTER, SAID RING HAVING AN ODD NUMBER OF ANTENNAS OCCUPYING ALTERNATE ONES OF TWICE THAT NUMBER OF EQUALLY SPACED POSITIONS ON THE RING, THE ENERGIZING OF THE ANTENNAS BY SAID FIRST TRANSMITTER BEING IN ORDER AROUND THE CIRCLE EXPECT THAT WHEN THE COUPLING CYCLE REACHES A POSITION UNOCCUPIED BY AN ANTENNA THE ANTENNA DIAMETRICALLY OPPOSITE THE UNOCCUPIED POSITION IS ENERGIZED BY SAID SECOND TRANSMITTER, SUCCESSIVE SUCH TRANSISTIONS OF THE COUPLING CYCLE FROM AN UNOCUPPIED POSITION TO AN OPPOSITE ANTENNA INITIATING THE SAID HARMONIC REFERENCE SIGNAL, AND MEANS TO COUPLE SUCCESSIVELY THE ANTENNA THE DIRECTION-DEPENDSIMULATE A ROTATION OF AN ANTENNA THE DIRECTION-DEPENDENT SIGNAL BEING A FREQUENCY MODULATION CAUSED BY THE SIMULATED ROTATION, AND THE REFERENCE SIGNAL AN AMPLITUDE MODULATION PHASE-RELATED TO SAID SIMULATED ROTATION.