×

Electronic landmark enhancement to GPS based navigation systems

  • US 5,748,136 A
  • Filed: 09/22/1995
  • Issued: 05/05/1998
  • Est. Priority Date: 09/22/1995
  • Status: Expired due to Term
First Claim
Patent Images

1. An aircraft landing system comprising:

  • a global positioning system on board an aircraft for generating a present position report for the aircraft;

    an interrogating radar, coupled to the aircraft for providing an interrogating signal in a predetermined direction, with respect to a flight direction of the aircraft;

    a radar-activated passively powered runway beacon disposed at a predetermined location near an aircraft runway which transmits a unique identification signal when interrogated by the aircraft; and

    a receiver disposed upon the approaching aircraft which receives the unique identification signal.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×