Head up display and pitch generator
AssigneeSundstrand Data Control, Inc.
InventorHans Rudolf Muller
Life of this patent
Estimating the term…
Abstract
A collimated head up display of pitch related information for an aircraft operator. A generated pitch signal combines a gyroscope signal referenced to the airframe with an inertial signal referenced to the head up display or combiner screen. A pitch error signal representing the difference between the generated pitch signal and the inertial pitch signal is limited and integrated to develop a pitch correction signal which is added to the gyroscope signal. Reference of the inertial signal to the combiner screen of the display eliminates static alignment errors. The pitch correction signal may be selected for display during alignment of the combiner screen.
Claims16
A pitch signal generator for an aircraft, comprising:
- a source of gyroscope based aircraft pitch signal;
- a source of inertial based aircraft pitch signal;
- means for combining the gyroscope based pitch signal with a pitch correction signal to produce a generated pitch signal;
- means for subtracting the generated pitch signal from the inertial based pitch signal to produce a pitch error signal;
- and
- means responsive to said pitch error signal to generate said pitch correction signal.
A pitch signal generator for an aircraft, comprising:
- a source of gyroscope based aircraft pitch signal subject to long term error;
- a source of inertial based aircraft pitch signal subject to short term error;
- a source of pitch correction signal for correcting the long term error of the gyroscope based pitch signal;
- a first summing junction having one input connected with the source of gyroscope based pitch signal and another input connected with the source of pitch correction signal, and an output for the generated pitch signal;
- a second summing junction having one input connected with the source of inertial based pitch signal and another input connected with the output of the first summing junction, the output of the second summing junction being a pitch error signal representing the difference between the inertial based pitch signal and the generated pitch signal;
- a limiter connected with the output of said second summing junction, limiting the amplitude of the pitch error signal to minimize response to transient conditions;
- and
- an integrator connected with the output of said limiter to integrate the limited pitch error signal, providing the pitch correction signal which is connected with an input of said first summing junction.
Dependencies are inferred from the claim text.