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Aircraft location and identification system

  • US 5,596,332 A
  • Filed: 05/22/1996
  • Issued: 01/21/1997
  • Est. Priority Date: 04/19/1994
  • Status: Expired due to Term
First Claim
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1. An aircraft location and identification system, for determining probabilistic future tracking information for aircraft comprising:

  • A transmitting aircraft,a receiving aircraft, first position determining means employing earth coordinate position data located aboard said transmitting aircraft for determining a first set of present positional and tracking information described in electronic format, relating to the position of said transmitting aircraft relative to earth coordinates;

    transmitting means aboard said transmitting aircraft and connected to said first position determining means aboard said transmitting aircraft for the non-interrogating, non-redundant differential, phase-shift keyed transmission of said first set of present positional and tracking information by frequency division multiplexing on a unique assigned carrier frequency channel to said receiving aircraft;

    second position determining means located aboard said receiving aircraft for determining a second set of present positional and tracking information described in electronic format, relating to said receiving aircraft; and

    computing means located aboard said receiving aircraft including storage means for storing present values and past values of said first set of positional and tracking information transmitted from said transmitting aircraft, and for storing present values and past values of said second set of positional and tracking information relating to said receiving aircraft, said computing means further including processing means for utilizing said past and present values of said first set of positional and tracking information from said storage means to compute corresponding first probabilistic future tracking path information for said transmitting aircraft and for utilizing said past and present values of said second set of positional and tracking information to compute corresponding second probabilistic future tracking path information for said receiving aircraft, said computing means further including intersection means for determining whether the first probabilistic future tracking configuration will intersect the second probabilistic future tracking configuration in the future,prediction means for determining a maximum probability of intersection between the first probabilistic future tracking configuration and the second probabilistic future tracking configuration,threshold means for determining whether said maximum probability of intersection exceeds a predetermined threshold,warning means for providing a warning if said maximum probability of intersection exceeds a predetermined threshold, andwherein said transmitting means transmits said positional and tracking information in a non-redundant, unique selected one of CDMA and FDMA transmission coding.

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