Vlf long range navigation system without significant ambiguities

Claim 1

A VLF LONG-RANGE NAVIGATION SYSTEM FOR PROVIDING LOCATION INFORMATION TO MOBILE CRAFT, COMPRISING: (A) A PLURALITY OF TRANSMITTING STATIONS FOR ESTABLISHING ISOPHASE, HYPERBOLIC LINES-OF-POSITION; (B) EACH OF SAID TRANSMITTING STATIONS HAVING A TRANSMITTER, A FIRST FREQUENCY SOURCE, A SECOND FREQUENCY SOURCE AND A TRANSMITTER SWITCHING MEANS FOR SEQUENTIALLY CONNECTING SAID FIRST FREQUENCY SOURCE AND SAID SECOND FREQUENCY SOURCE TO SAID TRANSMITTER; (C) SAID TRANSMITTER SWITCHING MEANS CONTROLLING SAID TRANSMITTING STATIONS SUCH THAT NO TWO TRANSMITTING STATIONS ARE TRANSMITTING THE SAME FREQUENCY AT THE SAME TIME; (D) A RECEIVER STATION FOR RECEIVING SIGNALS FROM SAID TRANSMITTING STATIONS AND DETERMINING THEREFROM THE POSITION OF SAID RECEIVER WITH RESPECT TO SAID TRANSMITTING STATIONS; (E) SAID RECEIVER STATION COMPRISING MEANS FOR RECEIVING SAID TRANSMITTED SIGNAS, MEANS FOR STORING PHASE INFORMATION FROM SAID TRANSMITTED SIGNALS, MEANS FOR MEASURING THE PHASE DIFFERENCE BETWEEN SIGNALS OF THE SAME FREQUENCY TO ESTABLISH FINE ISOPHASE LINES-OFPOSITION, AND MEANS FOR COMPARING THE PHASE DIFFERENCES OF THE FINE ISOPHASE LINES-OF-POSITION TO DETERMINE COARSE LINES-OF-POSITION, WHEREBY AMBIGUITIES IN SAID FINE LINES-OF-POSITION ARE RESOLVED.