INS : Gyroscope errors : transport wander, apparent drift , coriolis effect ?

gkraju
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can anyone please explain me following errors of gyroscopes used in inertial navigation systems of aircraft :
a) what is transport wander , how actually it happens ?
b) what is apparent drift in gyroscope ?
c) what is coriolis effect and how it causes errors in gyroscopes ?
 
Not used anymore. RLGs (ring laser gyroscopes) have been the standard for the last 20 years.
 

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