摘要
子空间类方法能够较彻底地抑制高频回波中的海杂波,但该方法需要对高维协方差矩阵进行特征值分解,计算量很大,制约了方法的实际应用效率。针对该问题,提出了一种循环抑制杂波的快速子空间投影方法,通过快速子空间法估计出每次迭代的最大特征值及其特征向量,利用特征值差值拐点估计杂波和信号子空间维数,然后不断地对消掉杂波在空间的投影分量,最终使得慢速目标凸显出来。计算机仿真结果表明,快速方法的杂波抑制效果与子空间类方法相当,但计算速度大大提升,更适合实际工程应用。
The subspace method can suppress the sea clutter in the high frequency echo completely, but this method needs eigen -value decomposition for high dimensional covariance matrix, and the computation is very large, which restricts the practical application efficiency of the method. To solve this problem, a fast subspace projection method for cyclic clutter suppression is proposed. The maximum eigen - value and its cigcnvcetor arc estimated by the fast subspace method for each iteration, and the dimension of the signal and clutter subspace is estimated by using the inflexion point of the eigen - value difference, and then the projection component of the clutter in the whole space is continuously eliminated, finally, slow targets can be detected. Computer simulation results show that the clutter suppression effect of the fast method is comparable to the subspace method, but the computation speed is greatly improved, which is more suitable for practical engineering applications.
作者
刘定智
王道乾
LIU Dingzhi;WANG Daoqian(Guizhou Radio ＆ Television University,Guiyang 550023,Chin)
出处
《电视技术》
2018年第6期58-63,共6页
Video Engineering
基金
国家自然科学基金(54766757)
关键词
高频回波
海杂波抑制
子空间迭代
特征值分解
慢速目标检测
high frequency echo
sea clutter suppression
subspace iteration
eigen -value decomposition
slow target detection
作者简介
刘定智（1976-）,本科,高级实验师,研究方向为数据库及软件设计研究、信号分析技术,本文通讯作者,Email：ldz_2016@sina.com;;王道乾（1966-）,硕士,教授,研究方向为软件工程、数据库应用.
