基于空频解耦的宽带DOA估计算法  

DOA estimation of wideband signal based on Keystone transform

作　　者：苏志刚[1,2] 温宙 刘海涛[2] 吴仁彪[2] 

机构地区：[1]中国民航大学中欧航空工程师学院,天津300300 [2]中国民航大学天津市智能信号与图像处理重点实验室,天津300300

出　　处：《太赫兹科学与电子信息学报》2013年第5期765-769,共5页Journal of Terahertz Science and Electronic Information Technology

基　　金：中央高校科技基本科技业务费中国民航大学专项基金资助项目(ZXH2012H002);天津市自然科学基金资助项目(09JCYBJC00600)

摘　　要：宽带波达方向(DOA)估计是宽带阵列信号处理领域的热点问题,当宽带信号的距离分辨率与宽带孔径可比拟时,孔径渡越效应会成为影响宽带波达方向估计精确度的重要因素。基于宽带阵列信号在空域与频域间呈现线性耦合的特点,利用梯形变换进行解耦处理,并对解耦后数据相干积累进行DOA估计。实验结果表明,通过对宽带孔径渡越效应的消除,宽带DOA估计精确度显著提高。该算法具有较低的计算复杂度和较高的DOA估计精确度,是一种有效的宽带DOA估计算法。Direction Of Arrival（DOA） estimation for wideband signal is one of the hot issues in wideband array signal processing. Aperture fill effect is an important factor to affect the estimation precision of wideband DOA when wideband signal range resolution and wideband aperture are comparable. On the basis of the linear coupling characteristic between spatial domain and frequency domain of wideband array signal, Keystone transform is adopted for decoupling. Then the decoupled data is used for DOA estimation with coherent accumulation method. The results of simulation show that the precision of DOA estimation is improved remarkably by eliminating the effect of aperture fill effect. The proposed algorithm is an effective method due to its lower computational complexity and higher DOA estimation precision.

关 键 词：宽带信号 孔径渡越时间 梯形变换 宽带波达方向估计 

分 类 号：TN911.23[电子电信—通信与信息系统]