基于非圆信号的波束域共轭MUSIC方法

Beamspace conjugate MUSIC algorithm for non-circular signals

针对非圆信号形式,对传统的波束域MUSIC方位估计方法进行重构,提出了波束域共轭MUSIC方法来进行相干信号的波达方向估计。该方法充分利用非圆信号的特性,从阵列接收数据构造共轭对称的Toeplitz矩阵,将其作为伪协方差矩阵,使用波束域MUSIC算法进行处理来得到目标的方位估计值。该方法可以避免常规波束域MUSIC方法使用空间平滑预处理后损失阵列孔径,而导致可测的信号源数减少的问题。仿真表明,该方法在较少快拍数下,无需空间平滑就可以检测多个相关信号,其性能优于使用空间平滑技术的常规波束域MUSIC方法。

Aiming at non-circular signals from, reconstructed for non-circular signals to solve the coherent signals. The method exploits the characteristics of non circular signals to construct a conjugate symmetric Toeplitz matrix from received data. The resulted pseudo covariance matrix is then used by traditional beamspace MUSIC method to obtain the DOAs. This method avoids the array aperture loss and reduction in detectable target numbers encountered by the traditional beamspace MUSIC method. Simulation results show that the proposed method outerperforms the beamspace MUSIC method. It can resolve coherent signals by using only a few snapshots without spatial smoothing tech tuques.