基于时空联合估计噪声子空间的MUSIC波束形成方法

针对在宽带短脉冲情况下频域MUSIC波束形成过程中噪声子空间估计不稳定的问题,提出了一种基于时空联合估计噪声子空间的MUSIC波束形成方法。该方法首先对线列阵接收数据构造时域复解析数据;然后根据增广数据构造方法和空间滑动的方法,在时域数据长度更短的情况下,稳定实现噪声子空间估计;最后根据估计出的噪声子空间含有的正交特性,通过单位矩阵与噪声特征向量相乘来得到相应波束。数值仿真和实测数据处理结果表明,相比频域MUSIC波束形成方法,该方法减少了稳定获取噪声子空间所需的快拍数,具有较好的稳定性和检测性能,提高了MUSIC波束形成在实际应用中的鲁棒性。

MUSIC Beam-forming Method Based on Temporal and Spatial Union Estimation of Noise Subspaces

Under the case of broadband short pulse,for the instability problem of noise subspaces estimation in frequency domain MUSIC beam-forming,a MUSIC beam-forming method based on temporal and spatial union estimation of noise subspaces is proposed.Firstly,this method constructs the complex analytic data for liner array receiving data in time domain.Then,according to the construction method of time domain augmented data and the spatial sliding motion method,this method stably realizes noise subspaces estimation with shorter data length.Lastly,based on the orthogonal property of noise subspaces,this method obtains the corresponding beam via identity matrix and noise eigenvector.The numerical simulation and measured data processing results show that,compared with the frequency domain MUSIC beam-forming,the new approach reduces the number of snapshots for stably obtaining noise subspace,has better stability and detection performance,and improves the robustness of MUSIC beam-forming in the practical application.