Solid-state wave gyroscope: A new-generation inertial sensor

Perelyaev, S.E.; Bodunov, B. P.; Bodunov, S.B.

doi:10.23919/icins.2017.7995651

Cited by 10 publications

(1 citation statement)

References 2 publications

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“…Gyroscopes are the key angular rate sensors. In the current applications of inertial navigation, two types of gyroscopes dominate, that is, the optoelectronic types including ring laser gyros (RLGs) [1,2] and fiber optic gyros (FOGs) [3,4], based on the Sagnac effect, and solid vibratory types such as hemispherical resonator gyros (HRGs) [5,6], based on the Coriolis force. Among these products, the RLG is the main inertial device owing to the high performance and reliabilities to vibration and temperature, especially for the harsh environments.…”

Section: Introductionmentioning

confidence: 99%

Coupled Dynamic Analysis and Decoupling Optimization Method of the Laser Gyro Inertial Measurement Unit

Fang

Zeng

2019

Sensors

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The mechanical dithered ring laser gyro (RLG) effectively overcomes the lock-in effect and ensures the sensitive accuracy of the low angular rate for the gyro. However, in the inertial measurement unit (IMU) system, the dither excitation of three RLGs causes the coupled vibration of the IMU structure, which could seriously limit the measuring accuracy of RLGs. In this paper, the vibration frequency response characteristic of laser gyro IMU is taken as the focus point, and the method of multi-rigid body dynamics is used to establish the dynamic model of IMU suitable for vibration frequency response analysis. On the basis of the model, the multi-degree-of-freedom coupling vibration of IMU with the gyro dither excitation is clearly described. A new IMU dynamic decoupling optimization method is proposed to minimize the coupled vibration frequency response, and compared with the previous optimal design method. The prototype experimental test results show that the coupled vibration of IMU is restrained more effectively by the proposed new method than by the previous optimal design method. Finally, on the basis of this new method, the measuring accuracy of the RLGs in the IMU system is improved, which is quite useful for practical engineering application.

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