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Method and apparatus for obtaining accurately the angle of attack of an aircraft

  • US 3,930,610 A
  • Filed: 06/03/1974
  • Issued: 01/06/1976
  • Est. Priority Date: 06/03/1974
  • Status: Expired due to Term
First Claim
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1. A system for generating a signal representative of the angle of attack of an aircraft using vertical speed, air speed and pitch attitude data, said system comprising means for generating a pitch attitude signal proportional to aircraft pitch attitude, a processor for receiving said pitch attitude signal and for developing therefrom an output signal the magnitude and sense of which vary as a function of the aircraft chord line angle, means for generating a relative wind angle signal, comparison means for receiving and differentially combining said relative wind angle signal and the output signal from said processor so as to produce a signal whose magnitude and sense are respectively definitive of the extent and direction of the aircraft angle of attack, said means for generating a relative wind angle signal including an airspeed sensor for producing an airspeed signal, a corrective network connected to the output of said airspeed sensor for correcting said airspeed signal so as to provide a true airspeed signal, drift angle sensor means for generating a drift angle signal, means for connecting said drift angle signal to said corrective network and feedback means for connecting the output of said comparison means to said corrective network.

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