Fiber optic gyroscope north finder

A fiber optic gyroscope with its coil axis aligned to North-South and inclined to the horizontal by the angle of Latitude (i.e. with its axis parallel to that of the Earth) measures the angular rotation of the Earth: 15.041°/hr.

[1]  T Yoshino,et al.  Automatic north sensor using a fiber-optic gyroscope. , 1994, Applied optics.

[2]  A. Dandridge,et al.  Excess noise in fiber gyroscope sources , 1990, IEEE Photonics Technology Letters.