航空学报 > 2007, Vol. 28 Issue (6): 1449-1454

干涉型光纤陀螺温度漂移建模与实时补偿

金靖,宋凝芳,李立京   

  1. 北京航空航天大学 仪器科学与光电工程学院
  • 收稿日期:2007-01-12 修回日期:2007-06-04 出版日期:2007-12-15 发布日期:2007-12-15
  • 通讯作者: 金靖

Temperature Drift Modeling and Realtime Compensation ofInterferometric Fiber Optic Gyroscope

Jin Jing,Song Ningfang,Li Lijing   

  1. School of Instrument Science and Opto electronics Engineering, Beijing University ofAeronautics and Astronautics
  • Received:2007-01-12 Revised:2007-06-04 Online:2007-12-15 Published:2007-12-15
  • Contact: Jin Jing

摘要:

分析了干涉型光纤陀螺(IFOG)温度漂移的影响因素,通过建立温度与陀螺模型参数之间的线性相关关系,推导出了光纤陀螺温度漂移的分布模型。为了提高陀螺温度漂移模型的适应性,设计了0.25,0.75,1.00 ℃/min三种变温速率的温度试验,并利用小波变换的方法分离数据中的噪声和趋势项。基于温度漂移的分布模型和最小二乘误差(LSE)准则,建立了多参量联合线性模型来估计陀螺温度漂移。采用升温过程和降温过程分段建模的方法将多参量联合线性模型算法进行了简化,并在现场可编程逻辑阵列(FPGA)中分时复用一个全串行有限冲激响应(FIR)滤波器实现了陀螺温度漂移的实时估计。仿真的温度补偿结果及实时的温度补偿结果显示,该方法可以使陀螺温度漂移减小到1/10~2/10。

关键词: 光纤陀螺, 参数估计, 建模, 温度漂移, 数字滤波器

Abstract:

Influencing factors on the temperature drift of interferometric fiber optic gyroscope (IFOG) are analyzed. A distributed model of the temperature drift of IFOG is formulated by establishing the linear correlation between temperature and parameters of IFOG model. The temperature experiments with the 0.25,0.75,1.00 ℃/min rates of temperature change are designed to improve the temperature model adaptability of IFOG, and a discrete wavelet transform is used to extract the trend items from the temperature data and IFOG data of the experiments.

Key words: fiber , optic , gyroscope,  , parameter , estimation,  , modeling,  , temperature , drift,  , digit , filter

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