均匀圆阵下的宽带信号DOA估计算法

摘要

For the DOA estimation of broadband signal,it is required to scan in full band,which degrades the resolution and increases computing load.Then the proposed approach utilizes only a few sub-bands of the selected narrow band signals to finish the special spectrum estimation based on FFT transformation.The new algorithm achieves higher resolution in DOA estimation and less computing load as well.The steps of proposed strategy are presented and the performance of the computing load is analyzed in detail.In addition,the resolution and estimation error are also introduced through simulations.All the discussion employs the circle array,which is used more widely compared with linear array.%为了解决传统宽带信号DOA估计在全频段作谱峰搜索所得空间谱分辨率较低和计算量非常大的问题,新算法采用FFT变换,仅仅通过采用选取的部分频带数据进行基于子空间的空间谱估计,不仅可以提高宽带信号DOA估计的分辨率,同时减少了运算量.文章介绍了算法实现过程,并对算法计算量进行了定量分析,分辨率和误差性能则通过仿真进行比较分析.另外,算法以均匀圆阵为模型,相对于线阵结构,使所得结论更加具有实用性.