共形阵列信号DOA和极化状态联合估计研究

Joint Estimation of 2D-DOA and Polarization Based on Conformal Array

共形阵列是一种与载体表面共形的天线阵列。与平面阵列相比,共形阵列具有对载体电磁性能和动力性能影响小等优点,因此受到人们广泛的关注。受载体曲率影响,共形阵列具有多极性。在信号处理时,必须要考虑信号极化的状态。为此,针对共形阵列信号二维DOA和极化状态联合估计问题,提出了一种基于空时处理的参数估计算法。该算法通过对极化接收数据时域和空域联合处理构造时空DOA矩阵,利用DOA矩阵方法只需一次特征值分解即可获得信号二维DOA和极化状态参数估计。算法对阵列形状要求低,无需谱峰搜索和参数配对,计算量小。最后,以圆台共形阵列为例,通过仿真实验验证了算法的有效性。

Conformal array is a kind of array that has the similar shape as the platform surface.Com-pared with the conventional planar arrays,conformal array has many advantages,e.g.,suitability for differ-ent platforms and non-occupation of internal space and non-affectation of kinetic characteristic.Therefore, conformal array has been widely investigated in different areas.By the influence of the curvature of the carri-er,conformal array has polarization diversity.In signal processing,the state of the signal polarization must be considered.To this end,a joint estimation method of 2D-DOA and polarization is proposed for conformal array.Based on the polarization receiving data,space-time matrixes are constructed by spatial domain sam-pling and time domain sampling.The DOA matrix method is utilized to estimate the parameters in this meth-od.It doesn’t need spectral peak searching and parameter pairing.Simulation results demonstrate the effec-tiveness of the proposed algorithm.