基于FFT预估计的宽带信号DOA估计

将离散傅立叶变换（DFT）运用到宽带阵列信号处理中，对等距线阵接收的信号进行波达方向（DOA）估计，解决了基于聚焦的宽带信号DOA估计中预估速度较慢的问题。该方法能快速预估出DOA，与采用传统的波束形成法预估相比，计算速度大大提高。用该方法预估后再对波达方向作高精度估计，仍具有对信号的超分辨特性。计算机仿真结果表明此方法可以运用到宽带信号处理中，计算量与传统的波束形成法相比大大减少。

Wideband DOA estimation based on preliminary estimate using FFT

Discrete Fourier transform (DFT) is applied to the wideband array signal processing to process the signals received by uniformly spaced linear array. The problem of low preliminary estimate speed based on focusing is solved. Compared with conventional beam-forming method, its computational speed is much faster. High resolution estimate of DOA is got after it was preliminarily estimated using this method. Simulation results show that this method can be applied to wideband signal processing and its computational burden is much less than conventional beam-forming method.