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Visual environment simulator for mobile viewer

  • US 4,807,202 A
  • Filed: 04/17/1986
  • Issued: 02/21/1989
  • Est. Priority Date: 04/17/1986
  • Status: Expired due to Fees
First Claim
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1. Apparatus for periodically indicating the location and pitch, roll, and yaw orientation coordinates of a mobile unit, moveably disposed within a predefined implementation space, in terms of display images simulating an environment, comprising:

  • emitting means including three ultrasonic transmitters, fixedly disposed on, and relative to said space, for sending ultrasonic pulses into said space;

    detecting means including three ultrasonic receivers fixedly disposed on, and relative to, said mobile unit, for receiving ultrasonic pulses sent from said transmitters;

    measuring means, operatively coupled both to said emitting means and to said detecting means, for measuring the transit time intervals from the time when each transmitter initiates sending an ultrasonic pulse until the times when each of said three receivers receives that pulse, and for developing therefrom position indication signals;

    host computing means for storing graphic image data characterizing said environment, connected to receive input signals corresponding to said position indication signals and operative to use said image data to generate updated video image display signals representing said environment in the perspective from the position of said mobile unit; and

    video image displaying means, diposed fixedly with respect to said mobile unit, and coupled to receive said image display signals from said host computing means, for using said display signals to display images of said environment.

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