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The Testing and Application of Optic Gyro

Author: WeiZhiYing
Tutor: ZhangShuXia
School: Harbin Engineering University
Course: Navigation,Guidance and Control
Keywords: Optical gyroscope Find North algorithm Initial alignment Random error model
CLC: V241.5
Type: Master's thesis
Year: 2003
Downloads: 878
Quote: 9
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Abstract


Inertial Technology is completely independent of the measuring method, it does not rely on external information, such as light, electromagnetic waves, sound, a magnetic field to measure the lines of the carrier movement and the angular movement. Inertia technology is widely used in high-tech defense, aerospace technology, aircraft, ships and marine science and technology. Currently, high-precision, high reliability, low cost, miniaturization, digitized order inertial technology development direction. Laser gyro, the FOG is the generation and development of inertial technology heading for this indispensable factor. Optical gyro angular rate sensor based on the Sagnac effect (Sagnac). It represents a new direction in the inertial instruments and components development and its unique optical gyroscope solid, simple structure, wide dynamic range, the start-up time is short, just impact the ability of low cost, volume, compared with the traditional mechanical gyro small, light weight, low power consumption, making it suitable not only in the field of civilian industries, but also suitable for vehicles, various military applications. Optical gyro is very suitable for strapdown inertial navigation system, and therefore, it is a useful development prospects of the angular rate sensor. Optical gyroscope object of study, research carried out in the following aspects: In this paper, the optical the gyro performance of the two important indicators - scale factor and bias stability, a more detailed study, including the gyro bias B 0 , bias repeatability B r the Bias Temperature Sensitivity B t random walk coefficient rwc and scale factor K scale factor nonlinear K n , the scale factor asymmetry K h , the scaling factor repeatability K r and so on. Allan variance method affect the optical the gyro performance of the noise factor, such as angle random walk, bias stability, rate random walk, rate ramp quantization noise, Markov noise and sinusoidal noise separation. The five common noise factors including the angle random walk, bias stability, rate random walk, rate ramp and quantization noise gyro random error model. This article involves two applications: to find the North system as well as in the initial alignment of strapdown system research. Codes North programs using the multi-position measurement in the range of 360 °, and then proceed to the minimum variance fit or north to the angle data for digital Fourier transform. In a self-alignment, using the second position to the initial alignment, the use of wavelet analysis filtering of the output signal of the fiber optic gyroscope, and determines the initial direction cosine matrix and the inertial element to be calibrated.

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CLC: > Aviation, aerospace > Aviation > Aircraft instrumentation,avionics, flight control and navigation > Aircraft instrumentation,aerospace equipment > Gyro instrument
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