A TWO AXIS GYROSCOPE

摘要

A two axis gyroscope has a substantially planar vibratory resonator (5) having a substantially ring or hoop-like shape structure, carrier mode drive means (7) for causing the resonator (5) to vibrate in a Cosn theta out-of-plane carrier mode, where n has an integer value of 2 or more, support means (6) for flexibly supporting the resonator (5), carrier mode pick-off means (8) for sensing out-of plane movement of the resonator (5), X axis response mode pick-off means (9) for sensing in-plane Cosn1 theta response mode movement of the resonator in response to rotation of the gyroscope about the X axis, where n1 has a value of n+1 or n-1, and Y axis response mode pick-off means (11) for sensing in-plane Sinn1 theta response mode movement of the resonator (5) in response to rotation of the gyroscope about the Y axis where n1 has a value of n+1 or n-1, identical to that for the X axis response mode.