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使用基于射线简正波异地混响理论建立的水平接收阵接收海底混响模型,提出了水平阵被动时反混响抑制方法。以水平接收阵接收回波信号的某一时刻作为开始,分别对其前一时刻和后一时刻的回波信号做时反算子分解获得两个混响子空间,将这两个混响子空间的平均作为该时刻的混响子空间的一个估计,然后利用投影处理来抑制该时刻接收信号中的混响成分。该方法可以在一定程度上克服由于海底粗糙引起的局部时间(距离)段内接收回波信号的不平稳性,使得估计得到的混响子空间更加接近真实混响子空间。因此,利用其进行被动时反混响抑制可以增强回波信混比,提高对目标的检测和方位估计能力。针对典型浅海波导环境开展的仿真验证了本文方法的有效性。
The underwater receiving rejectile model is established by horizontal receiving array based on the ray reverberation theory, and the anti-reverberation method is proposed when the horizontal array is passive. Starting from a certain moment when the horizontal receiving matrix receives the echo signal, inverse time sub-decomposition is performed on the echo signal at the previous moment and the latter moment respectively to obtain two reverberant subspaces, and the two reverberant children The average of the space serves as an estimate of the reverberant subspace at that moment, and the projection process is then used to suppress the reverberation component of the received signal at that moment. This method can overcome the unsteadiness of received echo signal in local time (distance) caused by rough sea, to make the estimated reverberant subspace closer to the real reverberant subspace. Therefore, using it for passive anti-reverberation suppression can enhance echo signal-mixing ratio and improve the ability of target detection and bearing estimation. Simulation of the typical shallow-sea waveguide environment validates the effectiveness of the proposed method.