Aeronautics and astronautics – Aircraft control – Automatic
Patent
1977-12-08
1979-04-10
Blix, Trygve M.
Aeronautics and astronautics
Aircraft control
Automatic
244 1713, 244 83G, 318585, 318616, 364434, G05D 108
Patent
active
041484525
ABSTRACT:
This invention is an improvement in aircraft control systems that utilize feedback motion sensors to generate a control signal to control the aircraft. The improvement consists essentially of a complementary filter comprising a simplified model of the aircraft, a high-pass filter, a low-pass filter and a summing amplifier. The control signal is applied to the simplified model of the aircraft which ateempts to compute the vehicle response to the signal. This computed response is then fed into the high-pass filter to eliminate long-term errors in the calculated response, with the result that a good estimate of the high frequency content of the aircraft motion is obtained. In order to obtain a good estimate of the low frequency content of the motion a rate gyro signal is fed through the low-pass filter that eliminates all of the offending noise. The outputs from the high-pass and low-pass filters are summed by the summing amplifier to produce an estimated rate which is then used as a motion feedback signal. The use of the complementary filter permits a substantial increase in frequency band-width due to the simultaneous reduction in noise amplificaton and control limit-cycle tendencies.
REFERENCES:
patent: 3221229 (1965-11-01), Kezer
patent: 3283229 (1966-11-01), Lindahl
patent: 3361394 (1968-01-01), Pfersch
Garren, Jr. John F.
Niessen Frank R.
Blix Trygve M.
Eisenzopf Reinhard J.
King William H.
Manning John R.
Osborn Howard J.
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