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System and method for determining freight container locations

DC CAFC
  • US 7,102,564 B2
  • Filed: 04/13/2004
  • Issued: 09/05/2006
  • Est. Priority Date: 12/10/1991
  • Status: Expired due to Term
First Claim
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1. A method for determining freight container locations in a freight yard comprising:

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

    intermittently operating each receiver to transmit an identification and position;

    receiving said identification and position at a base station; and

    recording the identification and position of said receivers in said freight yard.

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