基于压缩感知的无模糊宽带测向技术  

Unambiguous wideband DOA estimation based on compressed sensing

作　　者：常虹[1] 卢光跃[1] 冯景瑜[1] 

机构地区：[1]西安邮电大学通信与信息工程学院,陕西西安710121

出　　处：《系统工程与电子技术》2013年第5期920-923,共4页Systems Engineering and Electronics

基　　金：国家自然科学基金(61271276)资助课题

摘　　要：针对宽带侦察接收机提出了一种新的基于压缩感知(compressed sensing,CS)的无模糊测量来波方向方法,采用非均匀阵列的空域欠采样特性及空域谱的稀疏特性,构造无模糊宽带测向的CS模型,利用基追踪降噪算法估计无模糊的空域响应,实现了最小阵元间距都无法满足空域Nyquist采样情况下的方向角无模糊估计,为了提高所提方法对噪声的鲁棒性及多信号处理能力,提出了快速傅里叶变换频域预处理和CS相结合的宽带测向方法,仿真结果验证了所提方法较直接CS方法具有更高的测向精度和更好的鲁棒性。A new method of unambiguous direction of arrival（DOA） estimation based on compressed sen- sing（CS） for wideband reconnaissance receiver is proposed. Making use of the characteristic of under sampling of the nonlinear array in spatial domain and the sparsity of spatial spectrum, the CS model of unambiguous DOA estimation is constructed and the basis pursuit de-noising algorithm is adopted to estimate the response of spatial spec- trum without ambiguity. DOA can be estimated unambiguously when the minimum element spacing does not meet Nyquist sampling in spatial domain. A method integrating fast Fourier transform pre-processing in frequency domain and CS algorithm is proposed. The proposed method improves the processing ability for simultaneous multi-signals and performs better robustness against noise. Computer simulations show that the proposed method performs better than the direct CS method with higher precision in DOA estimation and better robustness.

关 键 词：宽带接收 欠采样 压缩感知 稀疏性 快速傅里叶变换-基追踪降噪算法 来波方向估计 

分 类 号：TN971.1[电子电信—信号与信息处理]