宽带信号DOA估计的一种快速算法

CSM(Coherent Signals-subspace Method)算法需要构造聚焦矩阵和进行预估计,运算量大且估计精度容易受预估计的影响,很难达到信号实时处理的目的。为此，提出了一种基于前后向平均的改进非相干信号子空间算法(ISM:Incoherent Signals-subspace Method)。该算法通过把宽带信号分解为若干个窄带信号,对每个窄带信号先用前后向平均法进行去相关处理,再利用ISM算法对宽带非相干信号和相干信号进行DOA(Direction Of Arival)估计。该算法不需要进行预估计,且去相关处理简单容易实现,对宽带相干信号的估计虽然性能不如相干信号子空间算法,但运算量比CSM算法减小很多,是一种快速的宽带信号DOA估计算法。通过实验仿真和性能分析,验证了该算法的有效性。

Fast Algorithm for DOA Estimation of Wideband Signals

The CSM(Coherent Signals-subspace Method) is a effective method to estimate the DOA(Direction Of Arrival) of the coherent wide-band signals by using focusing matrix.But the CSM needs more operation and is easy to be affected by advanced estimation,and it can not process signals in real time,because it needs focusing matrix and estimates in advance.This paper proposes a modified ISM(Incoherent Signals-subspace Method) which is based on the forward/backward averaging method.According to decomposing the wide-b...