提出一种利用分数阶Fourier变换(FRFT)和旋转不变子空间(ESPRIT)算法实现多个线性调频(LFM)信号二维波达方向(DOA)估计的新方法。该方法利用FRFT对LFM信号的能量聚集特性,构造出一种新的FRFT域的阵列数据模型,并利用ESPRIT算法实现对多个LFM信号的二维DOA估计。仿真实验验证了算法的有效性。
A new method for 2D direction of arrival (DOA) of linear frequency modulation (LFM) sources was proposed by fractional Fourier transform (FRFT) and estimating signal parameters via rotational invariance technique (ESPRIT) algorithms. A new array model in FRFT domain was constructed based on the fact that the LFM signal has the energy-concentrated performance in the FRFT domain, and the 2D DOA estimation of multiple LFM sources was realized by ESPRIT algorithm. Simulation results verify the correctness and efficiency of the new algorithm.