关键词: 宽带信号DOA估计, 相干信号, 信号子空间, 前后向平均

Abstract:

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-band signals into many narrow-band signals, and decreasing the relativity of the every narrow-band coherent signals by using forward／backward averaging method, we can estimate the DOA of the incoherent and coherent wide-band signals using ISM. This algorithm is realized easyly in decreasing the relativity. Although the capability is not as good as the CSM to process the coherent wide-band signals, the operation is less than the CSM. This is a fast algorithm for the DOA estimation of the wide-band signals. Simulation result and theory analysis show that this algorithm is effective.

Key words: wide-band signals DOA estimation ,   , coherent signals, signals-subspace  ,  , forward／backward averaging