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Dual channel signal selection and fault detection system

  • US 4,916,612 A
  • Filed: 11/02/1987
  • Issued: 04/10/1990
  • Est. Priority Date: 11/02/1987
  • Status: Expired due to Fees
First Claim
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1. An aircraft signal selection and fault detection system, comprising:

  • a midvalue selector having an output and first, second, and third inputs, said first and second inputs being connected to receive first and second redundant localizer signals that are representative of the deviation of an aircraft from a runway centerline, said third input being connected to receive a third input signal that is representative of said deviation, said midvalue selector producing at its output the input signal corresponding to the midvalue of said input signals;

    means for producing a synthesized rate signal that is representative of the rate of deviation of the aircraft from said runway centerline;

    a normal mode complementary filter connected to receive said synthesized rate signal and the output of said midvalue selector, said filter being responsive to said signals to produce a normal mode complementary filter output signal that is representative of said deviation; and

    means for coupling said normal mode complementary filter output signal as the third input signal to said midvalue selector.

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