高精度光纤陀螺光源强度噪声的抑制  

Suppression for light source intensity noise in high-precision FOG

作　　者：李绪友[1] 张瑞鹏[1] 吴磊[1] 张勇刚[1] 

机构地区：[1]哈尔滨工程大学自动化学院,哈尔滨150001

出　　处：《中国惯性技术学报》2010年第5期600-603,共4页Journal of Chinese Inertial Technology

基　　金：国家自然科学基金资助项目(60604019)

摘　　要：掺铒超荧光光纤光源的光源强度噪声是影响高精度光纤陀螺随机游走系数的主要因素。为了降低陀螺随机游走系数,进一步提高陀螺精度,提出了一种抑制光纤陀螺光源强度噪声的方法。利用耦合器两个输出端输出光的相关性,将两束光转换为电信号送入FPGA中,用数字电路相减法实现光源强度噪声的抑制。通过Allan方差法对抑制前后陀螺输出数据的分析结果可以看出,采用数字相减法可以有效的抑制光纤陀螺的光源强度噪声,角随机游走系数与抑制前相比减小33%。该方法与以往的方法相比,具有工程实现简便、可靠性高、维护容易等优点。The light source intensity noise in the superfluorescent erbium-doped fiber source is a major factor that affects the angle random walk（ARW） of FOG. To reduce the ARW and improve the precision of FOG, a method for reducing the light source intensity noise is put forward, i.e. the digital subtraction in a field programmable gate array（FPGA）, which is based on the correlation between the two parts of the coupler. The output data of FOG was analyzed by Allan variance without the digital subtraction and with the digital subtraction respectively. The results indicate that 33% reduction is demonstrated in the ARW of FOG. This method is simple to implement, high reliable, and easy to maintain.

关 键 词：光纤陀螺 光源强度噪声 角随机游走系数 数字相减法 ALLAN方差 

分 类 号：U666.1[交通运输工程—船舶及航道工程]