Digital automatic direction finding system

Claim 1

A DIGITAL AUTOMATIC DIRECTION FINDING SYSTEM COMPRISING FIRST AND SECOND RECEIVING ANTENNAS DISPLACED IN SPACE UPON A MOUNTING MEMBER, MEANS FOR ROTATING SAID MOUNTING MEMBER ABOUT AN AXIS LYING AT THE MIDPOINT BETWEEN SAID ANTENNAS, RECEIVING MEANS, FIRST SWITCHING MEANS RESPONSIVE TO THE ROTATION OF SAID MOUNTING MEMBER TO SWITCH SAID FIRST TO THE INPUT OF SAID RECEIVING MEANS, A PREDETERMINED RATE TO THE INPUT OF SAID RECEIVING MEANS, MEANS FOR DEVELOPING A TRAIN OF FIRST PULSES OF PREDETERMINED POLARITY AT PREDETERMINED EQUAL ROTATIONAL INCREMENTS OF SAID ANTENNAS FROM A REFERENCE POSITION THEREOF, MEANS FOR DEVELOPING A SECOND TRAIN OF PULSED IN TIME COINCIDENCE WITH THE ROTATION OF SAID ANTENNAS THROUGH THE FIRST ONE OF SAID ROTATIONAL INCREMENTS SUBSEQUENT TO SAID REFERENCE POSITION THEREOF; SAID RECEIVING MEANS COMPRISING PHASE DETECTION MEANS, BIT DETECTION MEANS, MEANS RESPONSIVE TO THE OUTPUT OF SAID DETECTION MEANS TO DEVELOP A BINARY STREAM OF INFORMATION BITS CORRESPONDING TO THE RELATIVE PHASE OF THE RECEIVED SIGNAL AS COMPARED TO THE AVERAGE PHASE THEREOF, A DIGITAL COUNTER RECEIVING SAID SECOND TRAIN OF PULSES AND SAID FIRST TRAIN OF PULSES AND COUNTING SUCESSIVE ONES OF SAID FIRST TRAIN OF PULSED UPON A PULSE OF SAID SECOND TRAIN BEING APPLIED THERETO, AND COUNTER STOP LOGIC MEANS RECEIVING SAID BIT STREAM AND DEVELOPING A THIRD PULSE IN TIME COINCIDENCE WITH THE APPLICATION THERETO OF TWO SUCCESSIVE LIKE BINARY BITS, SAID THIRD PULSE BEING CONNECTED TO SAID DIGITAL COUNTER TO STOP THE COUNT SEQUENCE.