Fiber Optic Gyroscope and Signal Processing Method Based on Vector Space Analysis
A technology of fiber optic gyroscope and vector space, applied in the direction of Sagnac effect gyroscope, etc., can solve the problems of filter time delay and difficult setting of model parameters, achieve small delay effect, ensure orthogonality, and eliminate errors Effect
Inactive Publication Date: 2017-02-15
PEKING UNIV
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[0030] In order to overcome the problems of filter time delay and model parameter setting in the existing fiber optic gyroscope in order to suppress the detection noise, the present invention provides a new type of fiber optic gyroscope and signal processing method based on vector space analysis
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[0057] The present invention will be further described below through specific embodiments and accompanying drawings.
[0058] image 3 It is a principle diagram of the present invention, Figure 4 It is a schematic diagram of the overall structure on which the present invention is based, Figure 5 It is a flow chart of the internal processing of the digital annunciator. The device structure in the following description is based on Figure 4 , the process is based on image 3 with Figure 5 . For the sine wave modulated fiber optic gyroscope output signal, the orthogonal trigonometric function signal is used as the local signal, and the harmonic signal is extracted through correlation demodulation, and then the angular velocity information is obtained.
[0059] The selected quadrature local oscillation signal LO is:
[0060] Equation (9)
[0061]
[0062] Among them, ω is the modulation frequency, θ is the initial phase, and the local signal contains a constant ph...
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The invention relates to a fiber optic gyroscope based on vector space analysis and a signal processing method thereof. The method comprises the steps of: firstly, using an open loop test fiber optic gyroscope to conduct orthogonal balanced local signal demodulation, thus forming two orthogonal signals, and using an ordinary method to obtain an expectation signal at the same time; secondly, conducting a predetermined adaptive filtering on the obtained two orthogonal signals and expectation signal, conducting principal component analysis treatment on an error signal output from the adaptive filter, and conducting linear combination on response signals output from the adaptive filter, thus obtaining an optical fiber loop rotation angular velocity; finally, conducting a quasi Kalman filtering, which is based on signal to noise ratio, on the error signals and response signals , to obtain the final optimized angular velocity. The gyroscope and the signal processing method thereof are capable of overcoming problems of filter delay and difficult model parameter setting caused by inhibition of detecting noise in conventional optical fiber gyroscopes, are capable of realizing the inhibition of correlated noise of an optical fiber gyroscope system and signal synchronous optimization.
Description
technical field [0001] The invention belongs to the field of optical fiber sensors, and in particular relates to a novel open-loop optical fiber gyroscope and an optical fiber gyroscope signal estimation method based on vector signal detection and signal space analysis. Background technique [0002] A gyroscope is an inertial angular velocity measurement sensor used to determine the rate of rotation of a vehicle relative to an inertial frame of reference. Gyroscopes are widely used in the fields of guidance and attitude control, as well as scientific fields such as space-time precision measurement such as gravitational wave detection. There are mainly five types of gyroscopes currently used: mechanical gyroscopes, electrostatic gyroscopes, laser gyroscopes, fiber-optic gyroscopes (Fiber-optic gyroscope, FOG), and quantum gyroscopes. Optical gyroscopes based on the Sagnac effect are laser gyroscopes and fiber optic gyroscopes. Among them, the fiber optic gyroscope has signi...
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IPC IPC(8): G01C19/72
CPCG01C19/72
Inventor 李永啸王子南彭超李正斌
Owner PEKING UNIV