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Updated diver navigation device

  • US 3,944,967 A
  • Filed: 12/23/1974
  • Issued: 03/16/1976
  • Est. Priority Date: 12/23/1974
  • Status: Expired due to Term
First Claim
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1. An underwater navigation system comprising:

  • a beacon transmitter structured for transmitting a series of frequency shift, FSK, keyed transmissions and including;

    a source of electrical power, andtimer means connected between said source of electrical power of said beacon transmitter and the individual circuits thereof for energizing said circuits at predetermined intervals to produce a low, power-conserving duty cycle; and

    a beason receiver configured for location at a station remote from said beacon transmitter for receiving the signals from said beacon transmitter and display of a bearing angle therebetween and including,three spaced hydrophones located at points spaced as the verticies of an equilateral triangle,a plurality of FSK signal processing means each of which is operatively connected to one of said hydrophones to be associated therewith for processing the electrical outputs therefrom to obtain an amplified and detected output signal corresponding to the signal transmitted by the aforesaid beacon transmitter,digital phase comparator means connected to said FSK signal processing means for timely comparison of the output signals therefrom to obtain a signal corresponding to the sine and cosine of the bearing angle to be displayed,digital error rejection circuitry operatively connected to said digital phase comparator means so as to receive the sine and cosine signals therefrom and sample said signals to distinguish real from spurious signals,digital latch circuit means operatively connected to said digital error rejection circuitry for storing the distinguished real signals until updated by a subsequent reception of transmitted beacon information, anddisplay means operatively connected to said digital latch circuit means for converting said real signals to a visual signal indicating the bearing angle between the beacon receiver and the beacon signal source.

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