光电工程, 2018, 45 (10): 180082, 网络出版: 2018-12-18   

光纤陀螺随机误差的集成建模及滤波处理

Integrated modeling and filtering of fiber optic gyroscope's random errors
作者单位
火箭军工程大学控制工程系,陕西 西安 710025
摘要
为了对光纤陀螺仪随机误差进行分析处理,提高其使用精度,提出了一种经验模态分解与时间序列模型相结合的误差分析建模方法。以经验模态分解得到的本征模态函数为基础,分层进行ARMA 建模;在模型基础上逐层进行Kalman 滤波,实现对于随机漂移信号的滤除;最后通过信号重构,完成了从全频率角度对光纤陀螺仪随机误差进行分析建模的构想。与其他建模方法相比,该方法对于原始数据的模拟匹配程度更高,试验结果进一步表明,本文方法有效去除了光纤陀螺仪的随机漂移,提高了光纤陀螺仪的使用精度。
Abstract
In order to analyze and process the random error of the fiber optic gyroscope (FOG) and improve its use precision, an error modeling method that combined empirical mode decomposition (EMD) and time series model was proposed. On the basis of the intrinsic mode functions (Imf) which was obtained by empirical mode decomposition, auto-regressive and moving average model (ARMA) modeling is performed hierarchically for each Imf. Then, Kalman filtering is performed layer by layer on the basis of the model to remove the random drift signals from the real angular velocity information. At the end of the algorithm, the signal which had been filtered need to be reorganized, and through the above steps, the conception of analyzing and modeling in connection with the random error of FOG from full frequency’s point of view was realized. Compared with other modeling methods, this method has a higher degree of simulation matching to the original data, at the same time, the experimental results have further shown that this method can effectively remove the signal of random drift from the fiber optic gyroscope’s output signal and improve its use precision significantly.

刘文涛, 刘洁瑜, 沈强. 光纤陀螺随机误差的集成建模及滤波处理[J]. 光电工程, 2018, 45(10): 180082. Liu Wentao, Liu Jieyu, Shen Qiang. Integrated modeling and filtering of fiber optic gyroscope's random errors[J]. Opto-Electronic Engineering, 2018, 45(10): 180082.

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