基于波束域相干信号子空间法的宽带源小尺度基阵定向

在给定的小尺度平面四元阵的基础上,主要研究了波束域相关信号子空间算法(BeamSpaceCoherentSignal-subspaceMethod—BSCSM)在宽带源定向中的应用以及性能分析。用实测的直升机噪声仿真产生各个阵元上输出的宽带信号源,并且使得这组信号具有特定的波达方向(DirectionofArrival—DOA)。分别使用波束域相干信号子空间法(BSCSM)和阵元域的相干信号子空间法(CoherentSignal-subspaceMethod—CSM)与非相干信号子空间法(InCoherentSignal-subspaceMethod—ICSM),通过计算机仿真实验对其进行方位估计。在仿真实验中,可以直观地看出三种方法的性能优劣。根据计算机仿真结果,统计意义上的误差分析,以及对宽带平面波波达角度的角度分辨率等性能指标的分析比较,可以得出在小尺度基阵定向研究中,波束域方法能够获得比其他两种阵元域算法更好的性能。

Direction of arrival estimation of wide band sources with small array based on beam-space coherent signal-subspace method

With a small foursensor planar array,the beamspace coherent signalsubspace method(BSCSM) applied to the orientation of wideband sources is studied,and its performance analysed.Measured helicopter noise is used to simulate output of array elements as wideband sources,which are made to have certain directions of arrival(DOA).The BSCSM,CSM(coherent signalsubspace method) and ICSM(incoherent signalsubspace method) are employed respectively to estimate sources DOAs and accurately distinguished.Performance of the proposed method is compared with other methods mentioned in this paper with computer simulation.The beamspace method provides performance better than the other two methods in terms of simulation results,error analysis,and resolution estimation of angles of arrival of multiple wideband plane sources.