基于均匀圆阵的宽带相干LFM信号定位方法

本文提出一种基于均匀圆阵的宽带相干LFM信号定位方法。首先，算法根据LFM信号在分数阶傅里叶域的能量聚焦性，对接收信号做分数阶傅里叶变换，实现宽带信号的窄带化处理；其次，利用圆阵的虚拟轴向平移形成的相位差构造空间平滑矩阵，完成相干信号的解相干处理；最后，对空间平滑矩阵进行奇异值分解得到相邻阵元接收数据的相位差，结合相位差反演参数估计算法得到二维角度参数估计的闭式解。仿真实验验证了算法对宽带相干LFM信号定位的有效性。

Wideband Coherent LFM Signal Localization Method Based on Uniform Circular Array

In this paper, a method of wideband coherent LFM signal localization based on a uniform circular array is presented. Firstly, the narrow?band processing of wideband signal is realized by utilizing the energy focusing property of LFM signal in the fractional Fourier domain. Secondly, the spatial smoothing matrix is constructed by using the phase difference formed by the virtual axial translation of the circular array to achieve the decoherent processing of coherent signals. Finally, the singular value decomposition of the spatial smoothing matrix is performed to obtain the phase difference of the received data of adjacent array elements. Combined with the phase difference inversion parameter estimation algorithm, the closed?form solution of two?dimensional angle parameter estimation is obtained. Simulation results demonstrate the effectiveness of the proposed algorithm for wideband coherent LFM signal localization.