How to choose select gyro?
Inertial sensors
INS = Inertial Navigation System
IMU = Inertial Measurement Unit
Gyros and acceleration sensors
Based on conservation of momentum/inertia or changes of the path length (optical gyros)no external support needed, work everywhere under the known physical laws
Gyro performance
Classification according to bias drift
Rate grade 10 –10000 deg/h
Tactical grade 0,01 –10 deg/h
Navigation grade <0,01 deg/h
Mechanical, optical (fog, laser ring), MEMS (tuning fork, vibrating ring)
Dynamic area: few Hz –500Hz
Active Ring-laser Gyro
Active optical resonator
Resonator is a laser itself (active)
If gyro is rotated counter-clock wise direction, the counter-clock wise beam is travelling slightly longer than the opposite beam
The change in the path length is proportional to the rotation rate
In very small rotation rates there is a dead-band because of frequency lock-in
Seismic application of optical rotational sensors
Application areas and performances of the RLG and FOG gyroscopes
Contemporary inertial sensors qualification
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