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System and method for determining freight container locations

DC CAFC
  • US 6,266,008 B1
  • Filed: 11/04/1994
  • Issued: 07/24/2001
  • Est. Priority Date: 12/10/1991
  • Status: Expired due to Term
First Claim
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1. A method for determining locations of freight containers in a freight yard comprising:

  • attaching a number of GPS receivers to a number of freight containers in said freight yard;

    operating each receiver to receive GPS signals indicative of receiver position;

    intermittently operating each receiver to transmit data indicative of receiver identification and receiver position, including the substep of determining time and initiating said intermittent transmission based on said time;

    receiving said receiver identification and receiver position at a base station;

    correcting said receiver positions at the base station to determine corrected positions of said receivers; and

    displaying the identification and corrected position of said receivers in said freight yard.

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