Positioning system using packet radio to provide differential global positioning satellite corrections and information relative to a position

  • US 6,111,541 A
  • Filed: 09/24/1997
  • Issued: 08/29/2000
  • Est. Priority Date: 05/09/1997
  • Status: Expired due to Term
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First Claim
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1. A positioning system for determining a position and obtaining information about that position comprising:

  • a. means for receiving GPS transmissions;

    b. means for determining a position coupled to the means for receiving for determining the position of the positioning system based on the GPS transmissions; and

    c. means for communicating with a reference station, using a packet radio format, coupled to the means for determining, for obtaining non-mapping information related to the position from the reference station and automatically and periodically providing the position to the reference station, wherein the reference station includes means for tracking and monitoring the position of the positioning system and means for sending an alert coupled to the means for tracking and monitoring for sending an alert to a location other than the positioning system if the position of the positioning system is equal to an alert position.

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