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Which of the following spinning wheel gyro has an accuracy of 0.001 deg/hr?

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Which of the following spinning wheel gyro has an accuracy of 0.001 deg/hr?

(a) Floated TDF gyro

(b) Electrostatically suspended TDF gyro

(c) Floated SDF gyro

(d) Unfloated ball bearing gyro

The question was asked in a job interview.

My doubt is from Gyroscopes in chapter Satellite Radio Navigation  & Inertial Navigation of Avionics

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The correct answer is (b) Electrostatically suspended TDF gyro

The explanation: In electrostatically suspended TDF gyro, the spinning wheel is suspended electrostatically hence reducing friction and achieving 0.001 deg/hr accuracy but at costs orders of magnitude higher than the floated TDF gyros.

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