宽带信号源的波达方向估计新方法

A Novel Direction of Arrival Estimation Method of Wideband Signals

针对信号源数多于天线阵元数的情况,提出了一种新的宽带信号波达方向(DOA)的估计方法。与传统方法一样,首先把宽带信号分解为互不重叠的窄带部分,通过将信号频率的不同等效为阵元间距的不同而得到多个阵列,合理组合这些阵列可以获得一个多阵元的虚拟阵列,对此虚拟阵列的输出运用传统的窄带信号子空间方法即可进行高分辨DOA估计。不需要对阵列输出进行"聚焦"变换及角度预估计,并且利用两个阵元即可对多个宽带信号进行空间谱估计。仿真结果证明了该方法在信号源数多于阵元数情况下的有效性。

A novel scheme to Direction-of- Arrival（DOA） estimation for wideband source is proposed in this letter to cope with the scenarios where the number of the sensor is less than that of the source. Like the traditional methods, the wideband sources are first decomposed into narrowband portions. By treating the difference of frequency in each frequency bin as the difference of the interval of sensors,a new array with multi -sensor can be obtained. Consequently, the DOAs can be estimated by exploiting the traditional narrowband signal subspace techniques, Focussing transformation and preliminary estimation of DOAs are not needed, DOAs of multiple wideband sources can be estimated using only two sensors. Simulation results demonstrate the effectiveness and efficiency of our proposed methods to deal with the circumstances with more wideband sources than sensors.