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System for using differential GPS receivers with autopilot systems for category III precision approaches

  • US 5,945,943 A
  • Filed: 09/17/1997
  • Issued: 08/31/1999
  • Est. Priority Date: 09/17/1997
  • Status: Expired due to Term
First Claim
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1. A precision approach capable dual differential global positioning system (DGPS) receiver avionics system, comprising:

  • a first DGPS receiver adapted to interface with an autopilot of an aircraft, said first DGPS receiver adapted to employ carrier aiding to smooth code-phase pseudorange measurements to determine a first position;

    a second DGPS receiver adapted to interface with an autopilot of an aircraft, said second DGPS receiver adapted to employ carrier aiding to smooth code-phase pseudorange measurements to determine a second position;

    said first DGPS receiver and said second DGPS receiver adapted to determine a transition point, wherein said first position and said second position are proximate within a predetermined distance at said transition point and said transition point is located within a predetermined range on an approach path; and

    said first position and said second position set to an initial position after said transition point, said first DGPS receiver and said second DGPS receiver further adapted to utilize carrier phase tracking based upon said initial position, such that said first position and said second position remain proximate within said predetermined distance and such that said first DGPS receiver and said second DGPS receiver properly interface with said autopilot.

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