Householder干扰阻塞法的弱信号DOA估计

摘要

When Direction of Arrival(DOA)of strong interference is known or can be accurately estimated, one-dimensional weak signals’DOA is usually estimated by using jamming jam method. But when employ two-dimensional array, blocking ma-trix such as cascade of sparse matrices is not stable as the change of array geometry. The output signal of blocking matrix require pre-whitening process, which lead to the increasing complexity. Jamming jam method based on Householder transformation is presented, the method can both suppress strong interference and obtain the DOA of weak signals. The form of this blocking ma-trix is stable since it doesn’t changed along with the array geometry. Moreover, the output signal doesn’t require pre-whitening process, the method has the characteristics of low complexity and more accuracy.%在强干扰来波方向已知或可准确估计的情况下，一维微弱信号的DOA估计通常采用干扰阻塞的方法，当采用二维阵型时，该方法阻塞矩阵构建形式随阵型发生变化，且其阻塞输出信号需进行预白化处理，因此计算复杂度较高。提出一种基于Householder变换的干扰阻塞法，该方法可有效阻塞强干扰获得微弱信号DOA信息，阻塞矩阵构建形式固定，不随阵型发生变化，无需预白化处理，因此具有计算复杂度较低、精度较高的特点。