Laser gyros frequency biasing and fiber optic gyros phase biasing: Similarities and differences

Krobka, N. I.; Turkin, D. A.

doi:10.23919/icins.2017.7995661

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2020

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“…Equation (28) indicates that the spin oscillator can be locked to the CARE magnetic field when |ω 0 − ω r + d| < |l|. This phenomenon is similar to the lock-in in ring laser gyroscopes [20,21]. A comprehensive analysis can be seen in [19].…”

Section: Of 12mentioning

confidence: 75%

Cross-Axis Coupling Effects in Single-Axis Nuclear Magnetic Resonance Gyroscopes

Wang

Zhang

Zhan

et al. 2020

Sensors

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Nuclear magnetic resonance gyroscopes (NMRGs) may be operated in an environment with violent vibration that usually contains both linear components and angular components. To analyze the influence of angular vibration on an NMRG, cross-axis coupling effects are studied. The cross-axis rotation rates induce an equivalent magnetic field. Its influence can be described by the Bloch equations. The approximate frequency shift and amplitude of the spin oscillator with an equivalent magnetic field in the cross-axis were obtained, which was validated by numerical simulation. The findings show that the angular vibration component leads to a remarkable error for the NMRG. When the angular vibration frequency is near the Larmor frequency, the oscillation frequency of the spins may be locked to the angular vibration frequency, destroying the NMRG’s ability to measure rotation rates. The cross-axis coupling problem should be considered in the design of an NMRG and corresponding inertial navigation systems.

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Section: Of 12mentioning

confidence: 75%