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Rapid polar-finding de-noising processing method based on fibre optic gyro

A fiber optic gyroscope and processing method technology, which is applied in Sagnac effect gyroscopes, measuring devices, surveying, mapping and navigation, etc., can solve problems such as the influence of noise in north-seeking precision measurement, and achieve strong adaptability, good stability, The effect of improving the calculation accuracy

Inactive Publication Date: 2009-11-25
ZHEJIANG UNIV
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Problems solved by technology

North finding accuracy is therefore affected by measurement noise

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  • Rapid polar-finding de-noising processing method based on fibre optic gyro
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  • Rapid polar-finding de-noising processing method based on fibre optic gyro

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[0031] Wavelet analysis is especially suitable for non-stationary signals due to its excellent multi-resolution analysis characteristics, and using wavelet analysis to denoise does not require a systematic error model. The wavelet threshold denoising method based on the generalized cross-validation criterion does not need to estimate the variance of the noise, and the optimal threshold obtained is close to the ideal threshold. The present invention introduces the wavelet threshold denoising method based on the generalized cross confirmation criterion into the four-position static north-seeking of the fiber optic gyroscope, removes the measurement noise in the north-seeking process, and uses the denoised fiber optic gyroscope data to calculate the initial azimuth angle of the north-seeking, In order to improve the accuracy of north-seeking solution.

[0032] The fiber optic gyroscope-based fast north-finding and denoising processing method of the present invention will be descr...

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Abstract

The invention discloses a rapid polar-finding de-noising processing method based on fibre optic gyro. The method comprises: firstly, according to the static data collected in four orthogonal positions of the fibre optic gyro, performing wavelet transform to obtain a corresponding wavelet coefficient; then configuring a generalized cross-validation function from the wavelet coefficient; using an optimization algorithm to calculate a threshold that minimizes the generalized cross-validation function; then using a threshold function to process the fibre optic gyro wavelet coefficient after wavelet transform according to the threshold; then performing the wavelet inverse transform to the processed wavelet coefficient to obtain the de-noised fibre optic gyro output data; then performing the polar-finding azimuth angle calculation from the de-noised data. The invention introduces the wavelet threshold de-noising method based on the generalized cross-validation principle to the four-position static polar finding of the fibre optic gyro. The de-noising method has strong self-adaptability and good stability, which greatly improves the orienting precision of the polar-finding measurement.

Description

technical field [0001] The invention relates to a digital positioning technology based on an optical fiber gyroscope, in particular to a fast north-seeking and denoising processing method based on an optical fiber gyroscope. Background technique [0002] The existing north-seeking positioning technology based on fiber optic gyroscope generally adopts the static four-position north-finding method. North presence angle When , the output of the sensitive axis of the fiber optic gyroscope is , where k is the scaling factor of the fiber optic gyroscope, Ω E is the angular velocity of the earth's rotation, φ is the geographic latitude of the measurement point, ε(t) is the zero bias of the FOG, and ε is the measurement noise. In the horizontal plane, take the initial azimuth position of the sensitive axis of the fiber optic gyroscope as the initial position, and make it continuously turn to four specific positions that are orthogonal to each other Measure the output of the f...

Claims

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Application Information

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IPC IPC(8): G01C17/00G01C19/72
Inventor 戴昊刘巍张登伟舒晓武刘承
Owner ZHEJIANG UNIV
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