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Vehicle tracking system employing global positioning system (GPS) satellites

  • US 5,225,842 A
  • Filed: 05/09/1991
  • Issued: 07/06/1993
  • Est. Priority Date: 05/09/1991
  • Status: Expired due to Term
First Claim
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1. A tracking system employing global positioning system (GPS) satellites for determining the position of one or more objects to be tracked, the tracking system comprising:

  • sensor means, mounted on each object, the sensor means being operative for receiving signals provided by a plurality of visible GPS satellites and for computing sensor data comprising selected raw satellites measurements;

    workstation means, positioned at a central location that is remotely located with respect to said one or more objects, for periodically receiving and storing the raw satellite measurements computed by said sensor means, for computing therefrom position information relative to the one or more objects, and for displaying the computed position information to an operator at said central location, said workstation means being further operative for periodically providing initialization data in the form of sensor commands to said sensor means to enable said sensor means to acquire and track the plurality of visible GPS satellites, said workstation means being operative for storing a digital map containing route and altitude aiding information regarding each of the one or more objects, thereby facilitating computation of said position information using only high elevation satellites and when the one or more objects are operating in a high rise urban environment; and

    a communication link coupling said sensor means and said workstation means to facilitate the transfer of sensor data and sensor commands between said sensor means and said workstation means.

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