摘要
针对分布反馈光纤激光水听器系统在高速运动过程中干涉仪噪声过大的问题,提出了基于参考光源的差分探测方案,设计了基于3端口环形器的光纤干涉仪差分探测光路,利用改进的变步长LMS滤波算法,结合噪声自适应抵消技术和B样条小波变换,有效抑制了干涉仪噪声,解决了信噪比下降的问题。实验结果表明:该方法能降低系统噪声本底约30 dB;与传统参考传感器的差分方案相比,该方法不易受环境影响,不会增加阵列复杂度,更具有实用价值。
In response to the problem of excessive interferometer noise during the high-speed motion of distributed feedback fiber laser(DFB FL)hydrophone system,a differential detection scheme based on reference fiber laser was proposed,and a fiber interferometer differential detection optical path based on a 3-port circulator was designed.An improved variable-step LMS algorithm was proposed in combination with adaptive noise cancellation technology and B spline wavelet transform,which effectively suppressed the interferometer noise and solved the signal-to-noise ratio degradation.The experimental results show that the scheme can reduce the noise floor of the system by about 30 dB.The new scheme does not increase the complexity of the array and is not easily affected by the environment,so it has more practical value compared with the traditional differential detection scheme of reference sensor.
作者
徐丹
黄俊斌
刘文
顾宏灿
宋文章
XU Dan;HUANG Junbin;LIU Wen;GU Hongcan;SONG Wenzhang(College of Electronic Engineering,Naval Univ.of Engineering,Wuhan 430033,China;College of Weaponry Engineering,Naval Univ.of Engineering,Wuhan 430033,China)
出处
《海军工程大学学报》
CAS
北大核心
2023年第1期61-67,共7页
Journal of Naval University of Engineering
基金
国家部委基金资助项目(41415030302)。
关键词
分布反馈光纤激光器
干涉仪噪声
差分探测
变步长最小均方算法
自适应噪声抵消
distributed feedback fiber laser
interferometer noise
differential detection
variable-step size LMS algorithm
adaptive noise cancellation
