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In which type of inertial navigation system are the gyro and accelerometer rigidly mounted to the body?

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In which type of inertial navigation system are the gyro and accelerometer rigidly mounted to the body?

(a) Gimballed system

(b) Fixed system

(c) Strapdown system

(d) Void system

This question was addressed to me in my homework.

Query is from Strap Down and Gimballed Inertial Navigation Systems topic in portion Satellite Radio Navigation  & Inertial Navigation of Avionics

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The correct option is (c) Strapdown system

The best explanation: In a strapdown navigator, Gyroscopes and accelerometers are rigidly mounted to a sensor assembly that is usually mounted to the vehicle on a set of strap mounts. The gyroscopes track the rotation of the body and compute the orientation of the body.

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