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Shipboard reference for an aircraft navigation system

  • US 4,032,759 A
  • Filed: 10/24/1975
  • Issued: 06/28/1977
  • Est. Priority Date: 10/24/1975
  • Status: Expired due to Term
First Claim
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1. A method of rapidly aligning aircraft inertial platforms installed in aircraft located aboard an aircraft carrier which changes its location with time, said aircraft carrier thereby having a state vector containing as elements at least the velocity of said aircraft carrier and its position, comprising the steps of:

  • (a) installing a low-accuracy aircraft type inertial reference system on the aircraft carrier, said system including an inertial subsystem and a Kalman filter, said inertial subsystem providing as outputs quantities representing the velocity of the aircraft carrier,(b) installing means on the aircraft carrier providing updating information regarding the state vector of the aircraft carrier to said Kalman filter;

    (c) providing as a velocity reference to the aircraft the velocity outputs of the inertial subsystem of said inertial reference system;

    (d) updating said inertial subsystem of said inertial reference system from said Kalman filter at intervals of the order of magnitude of two hours and never while providing a velocity reference to an aircraft.

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