摘要
轴频电场是海水中运动船舶的一种微弱特征信号,极易被噪声掩盖,具有良好的线谱性。海洋环境电场作为背景噪声,具有良好的高斯性,为了在复杂海况下提取微弱轴频电场信号,提出一种基于高阶累量的船舶轴频电场信号自适应增强方法,运用观测信号的四阶累量一维非对角切片构造有限冲激响应滤波器,使用该滤波器从海洋环境电场中提取船舶轴频电场信号。分别使用实测数据和仿真数据对本文所提方法进行检验,检验结果表明,该方法能够在较低的信噪比条件下有效增强船舶轴频电场信号,性能优于现有的基于2阶统计量的信号增强方法。
The weak electric field of shaft rate generated by sailing ships in the sea enjoys the characterisitic of line spectrum,which is liable to be covered by noise.As a background noise the electric field of ocean environment has good Gaussian characteristic.In order to extract the weak electric field signals in complex sea conditions,and adaptive enhancement approach was proposed on the basis of higherorder cumulants.The one-dimsension non-diagonal slice of fourth-order cumulant of the observed noise signal was used to construct the finite impulse response filter.Then the electric field signal of shafe rate was extracted with the filter.Simulation and practical results show that the proposed method can effectively enhance ship shaft-rate electric field signals in low SNR conditions,and that the performance is better than conventional signal enhancement methods based on second-order cumulants.
出处
《舰船科学技术》
北大核心
2014年第5期120-124,共5页
Ship Science and Technology
基金
国防科技重点实验室基金资助项目(2011SSDKZD03.02)
关键词
轴频电场
信号处理
高阶累量
自适应信号增强
shaft-rate electric field
signal processing
higher-order cumulants
adaptive signal enhancement
