用DFT技术对阵列信号进行处理

Array Signal Processing by DFT

针对阵列信号处理中的波达方向和频率估计问题提出了新的方法．该方法利用ＤＦＴ技术，对波达方向和／或频率同时进行估计．两者之间的配对问题以对应关系自动解决．这样不但可以完全避免繁重的空间谱搜索，运算量少，充分利用成熟的ＤＦＴ技术．仅用两个传感器即可实现对任意数目的信号源进行估计，硬件要求更小．计算机模拟实验证实了该方法的有效性．

This paper presented a new signal estimation algorithm, which can estimate the spatial azimuths θ i and the temporal frequencies f i of the sources by using DFT technique. The parameter pair (θ i,f i) of each source can be easily obtained and automatically combined from the DFT spectrum. The proposed approach is simple and direct and does not require any search procedure. The number of the sources being detected is much more than that of the sensors used. The simulation results were presented to demonstrate the performance of the proposed approach.