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针对均匀圆阵(UCA),根据不同线性调频(LFM)信号在对应阶次上的分数阶傅里叶变换(FRFT)域具有能量聚集性的特点,将不同时频特性LFM信号在FRFT域分离成一系列平稳单频信号,构造出FRFT域上新的空时频分布模型数据,结合MUSIC算法,提出了一种新的均匀圆阵多宽带LFM信号的二维DOA估计。通过仿真实验验证了该方法的有效性。
According to the uniform circular array (UCA), the fractional Fourier transform (FRFT) domain of different linear frequency modulation (LFM) signals has energy accumulation characteristics, and the LFM signals with different time-frequency characteristics are separated in the FRFT domain A series of stationary single-frequency signals are constructed to construct a new space-time and frequency-domain model data on the FRFT domain. Combined with the MUSIC algorithm, a new two-dimensional DOA estimation of a uniform uniform circular array LFM signal is proposed. The simulation results show the effectiveness of the method.