一种改进的被动合成孔径算法用于舰船辐射噪声检测

舰船辐射噪声在低频段具有稳定的线谱成分,利用该线谱成分可以实现对水下目标的检测.被动合成孔径声呐(Passive Synthetic Aperture Sonar,PSAS)技术是对小孔径基阵沿直线运动接收到的信号进行孔径合成处理,以时间增益换取空间增益,进而提高对弱目标信号的检测能力.该文中提出一种改进的被动合成孔径算法较之常规孔径合成算法不要求阵元相互重叠,综合考虑接收阵元在时间域和空间域上变化,分时间段进行处理,继而可直接进行时延补偿,理论分析结合实际仿真、海试数据综合验证算法及其性能.研究表明:改进的被动合成孔径算法具有一定有效性和可行性,且便于工程实际应用.

An Improved Passive Synthetic Aperture Sonar Alogorithm Application for Detecting of the Ship Radiated Noise

The ship radiated noise is provided with a stable part of line-spectrum, and the underwater target can be effectively detected by using the line-spectrum signal. The technology of Passive Synthetic Aperture Sonar (PSAS), processing for space gain exchange by time gain, which is used for synthetic processing the receiving signal of small aperture array along the linear motion, thereby the detection ability of the weak target is more excellent. An improved PSAS algorithm is proposed in this paper, compared to conventional aperture synthesis algorithm, it does not require the array element to overlap, and it processes the received signals in a segment of tine by the overall valuation array element changes on the time domain and the spatial domain, then it can directly carry out delayed compensation. Through theoretical analysis and actual simulation on ocean-trial, the validity and feasibility of the algorithm are proved. Moreover, it is suitable enough for practical engineering.