基于拉伸处理的宽带频域接收波束形成方法

为了抑制宽带干扰信号，提出了一种基于频域的宽带接收波束形成方法。该方法针对线性调频信号，在对接收信号做拉伸处理和窄带滤波之后，进行傅立叶变换划分为许多窄带，然后对不同频带的信号按窄带方法（例如采样矩阵求逆法）接收波束形成。与传统的频域方法相比，大大降低了数据率和计算量，易于工程实现；与拉伸处理波束形成方法相比，该方法能有效抑制宽带干扰，阵列输出信号干扰噪声比高。最后计算机仿真证实了新方法的有效性。

Wideband received beamforming in frequency domain based on stretch processing

In order to suppress wideband interference signal, a new wideband received beamforming method in frequency domain was presented for LFM signal. The algorithm divides the received signal into many narrowband signals by Fourier transform after stretch processing and narrowband filtering, then perform beamform using narrowband algorithm (such as SMI). The bandwidth of target signal is greatly reduced after stretch processing and narrowband filtering. Compared with frequency domain method and beamforming based on stretch processing, the algorithm reduces greatly the data sample ratio and computation, and can suppress wideband interference effectively and improve output SINR. Finally, the computer simulations demonstrate the effectiveness of the proposed method.