Ronald C Hooper

US Patent:

45534390, Nov 19, 1985

Filed:

Jul 5, 1983

Appl. No.:

6/510535

Inventors:

Ronald Hooper - Dahlgren VA
Kenneth Nichols - Fredericksburg VA

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G01C 1930
G01C 1932

US Classification:

74 54

Abstract:

A synchronous demodulator is configured so as to extract gyroscope position nformation in a polar coordinate format and then resolve it into position information in a more useful cartesian coordinate format. The technique involves integration of a gyroscope cage coil signal over integration intervals controlled by spin reference signals rather than by the commonly noisy cage coil signal. Integration of the cage coil signal over intervals controlled by the spin reference signals yields outputs of. lambda. cos. theta. and. lambda. sin. theta. which are subsequently sampled and held and then summed to produce a precession coil drive signal whose phase is in the proper relationship to make the gyroscope precess in the correct direction.