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Digital electronic locator

  • US 6,344,797 B1
  • Filed: 07/21/1999
  • Issued: 02/05/2002
  • Est. Priority Date: 07/21/1999
  • Status: Expired due to Fees
First Claim
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1. An apparatus for locating an object/animal/person within a vast area, comprising a portable transmitter unit carried by the searcher or locator and an object/animal mounted or a person carried receiver unit,said portable transmitter unit including:

  • power supply means;

    line driver means to generate an n-bit unique encoded digital signal in order to enable unique activation and locating in a field of locating apparatuses;

    frequency shift keying means which modulates the encoded signal such that a logic one in the said signal is represented by an audio signal at a specified frequency and a logic zero is represented by an audio signal at a different frequency;

    frequency modulation means where a carrier signal at a radio frequency is modulated by the frequency shift keying modulated encoded digital signal;

    amplifying means to amplify the said signal prior to feeding it to the said frequency modulation means;

    directional antenna means for transmitting the amplified signal outputted from the said amplifying means;

    said object/animal mounted or person carried receiver unit including;

    power supply means;

    omni-directional antenna means for receiving the transmitted signal from the said portable transmitter unit;

    frequency demodulation means to demodulate the said transmitted signal;

    amplifying means which amplifies the demodulated signal outputted from the said frequency demodulation means;

    frequency shift keying demodulation means to demodulate the output signal from the said amplifying means;

    decoder means to decode the output signal from the said frequency shift keying demodulation means;

    electronic control means triggered from the said decoder means;

    alerting means fed from the said electronic control means.

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