An anti-disturbance north-seeking calculation method for a single-axis fiber-optic gyroscope
A fiber optic gyroscope and calculation method technology, which is applied in the field of inertial north-seeking orientation measurement, can solve problems such as the deterioration of the north-seeking accuracy of the gyro north finder, and achieve the effect of solving the worsening of the north-seeking accuracy and improving the north-seeking accuracy.
Inactive Publication Date: 2019-05-17
HARBIN ENG UNIV
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[0004] The purpose of the present invention is to provide a single-axis fiber optic gyro anti-disturbance north-seeking calculat
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[0043] In actual use, the gyro north finder is usually configured on the vehicle. The high-frequency vibration generated by the engine unit of the vehicle and the low-frequency vibration caused by people walking and gusts inevitably act on the gyro north finder, making the north-finding accuracy Greatly reduced. The purpose of the present invention is to solve the problem that the north-seeking accuracy of the gyro north-finder becomes worse in the use environment with interference.
[0044] The single-axis fiber optic gyro anti-disturbance north-seeking calculation method designed by the present invention comprises the following steps:
[0045] Step 1. First place the gyro north finder at a position and collect the fiber optic gyroscope data at the current location, and at the same time perform five-layer wavelet decomposition with db3 as the wavelet base on the collected fiber optic gyroscope data. The first decomposition obtains the high-frequency coefficient d1 of the fir...
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The invention provides an anti-disturbance north-seeking calculation method for a single-axis fiber-optic gyroscope, and belongs to the field of inertial north-seeking directional measurement. The method comprises the following steps of firstly, carrying out five-layer wavelet decomposition on acquired fiber-optic gyroscope data by taking db3 as a wavelet basis; sliding window filtering is conducted on the high-frequency coefficients of the first layer, the second layer and the third layer, carrying out the hard threshold denoising on the high-frequency coefficients of the fourth layer and thefifth layer, forming a new high-frequency coefficient, reconstructing the denoised fiber-optic gyroscope signal through the new high-frequency coefficient and the low-frequency coefficient, and thenweighting and averaging and using the denoised fiber-optic gyroscope signal in a north-seeking calculation formula. By adopting the improved wavelet denoising method and the weighted averaging method,the problem of poor north-seeking precision in practical environment application is effectively solved.
Description
technical field [0001] The invention belongs to the field of inertial north-seeking orientation measurement, and in particular relates to a single-axis optical fiber gyroscope anti-disturbance north-seeking calculation method. Background technique [0002] At present, the commonly used north-seeking scheme of fiber optic gyro is a static multi-position north-seeking scheme, that is, to collect data of fiber optic gyroscope at certain specific azimuths, and to solve the north direction by listing the equations according to the different components of the earth's rotation angular velocity sensitive to different positions of the fiber optic gyroscope. horn. For the north-seeking fiber optic gyro north-finder with a static base, to achieve high-precision north-finding, it is necessary to ensure that the base must be stable and free from various interferences from the external environment. The fiber optic gyroscope is very sensitive, and any internal or external slight disturban...
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Inventor 王伟王鹤然李欣黄平
Owner HARBIN ENG UNIV