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Personal security system and apparatus therefor

  • US 5,225,809 A
  • Filed: 12/24/1990
  • Issued: 07/06/1993
  • Est. Priority Date: 12/24/1990
  • Status: Expired due to Fees
First Claim
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1. A method for location of a mobile personal transmitter within a geographical area for the provision of requested services desired by a person selectively transmitting a coded frequency from said mobile personal transmitter, comprising:

  • (a) transmitting a selected radio frequency signal from said mobile personal transmitter having the capability of transmitting selected ones of a plurality of signals each having X and Y signal axes components, said selected signal designating a desired service;

    (b) receiving said selected radio signal by two or more of a plurality of antenna/transmitters strategically positioned in said geographical area and transmitting said received signal to a base station antenna located within said geographical area; and

    (c) computer processing and plotting of said X and Y signal axes components of said selected signal by means of a computer having a cathode ray tube and having software presenting on said cathode ray tube a computer grid-work representing said geographical area, thus identifying the location of the radio signal emitted by said mobile personal transmitter relative to said computer grid-work of said geographical area.

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