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G01C 19/24 (2006.01) G01C 17/28 (2006.01) G01C 19/28 (2006.01) G01C 19/36 (2006.01) G01C 19/44 (2006.01)
Patent
CA 1108442
Gyroscopic Method and Apparatus for Determining Magnetic Heading and Attitude Abstract A gyroscopic device of the type having a short- circuited rotor winding or conductor so shaped so as to produce axial and radial flux components when rotated in the earth's magnetic field is coupled to a coaxial sensing coil coaxial which gyroscopically stabilized thereby, signals induced in the sensing coil due to the axial flux component of the rotor is used to derive magnetic heading information and there is provided at least one further coil on the support- ing body and inductively linked to the sensing coil and rotor such that when the sensing coil is gyro- scopically stabilized by the rotor, the coil supported on the supporting body in relation to the gyroscopic- ally stabilized sensing coil is such that any changes in angular orientation of the supporting body relative to the gyroscopically stabilized sensing coil intro- duces changes in the signal voltages induced in the coils. The further coil on the supporting body may be excited with one or more excitation signals of a frequency different than the angular speed of the rotor and constituted by pairs of orthogonally related coils on all three axes, namely, the roll, pitch and yaw axes. The coil located on the yaw axis is coaxial with the gyroscopically stabilized sensing coil in the rest position and is used for eliminating ambigui- ties.
314554
Cessna Aircraft Company
Macrae & Co.
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