摘要
基于运动声源的时间方位特性,提出了采用均匀线列阵识别水下运动目标线谱噪声源的方法。利用时空二维MUSIC(Multiple Signal Classification)法对多个入射声源进行高分辨方位估计,获得运动声源的时间方位曲线,经野值点剔除和中值滤波平滑处理后,根据声源运动轨迹的先验信息,通过最小二乘法精确估计出噪声源通过线阵的正横时刻,最后结合参考声源确定噪声源在运动目标上的位置。考虑实际噪声测量情况,对时空MUSIC法做了近场修正,同时采用解相干处理使本文方法可适用于同频声源。数值仿真结果验证了方法的有效性。
Based on beating-time property of a moving acoustic source, a method was presented for identification of tonal noise sources of an underwater moving target with a uniform linear array （ULA）. The bearing-time curve of a moving target was obtained by utilizing high resolution DOA with the spatio-temporal two dimensional MUSIC （multiple-signal classification） algorithm. After the curve was smoothed with outlier removing and mean filtering, the moment when noise sources passed broadside of the linear array was estimated accurately with the least square method according to the prior information of the noise sources＇ motion trajectory. Locations of the noise sources were determined by referring to the position of a known acoustic source. Considering the actual measurement situation, the spatio-temporal MUISC method was modified for near field acoustic sources and coherent acoustic sources. Numerical simulations showed the validity of the proposed method.
出处
《振动与冲击》
EI
CSCD
北大核心
2012年第19期118-122,144,共6页
Journal of Vibration and Shock
基金
973资助项目
关键词
噪声源识别
运动目标
均匀线列阵
时空二维MUSIC
最小二乘法
identification of noise sources
moving target
uniform linear array （ULA）
spatio-temporal two- dimensional MUSIC
least square method
