基于正交投影的海面小目标检测技术

摘要

Fierce sea clutter submerges the slow weak target echo which makes the target detection difficult. To address the problem, a Constant False Alarm Rate (CFAR) detection method based on orthogonal projection is proposed in this paper. Utilizing the correlation of the clutter between neighbored range cells, this method suppresses clutter by orthogonal projection at first, and then carries out the CFAR detection. The structure chart of the CFAR detector using orthogonal projection is given. And the performance of clutter suppression and computation amount for orthogonal projection method and singular value decomposition method are compared. Theoretical analysis and simulation results with the experimental data show the superiority of the proposed method.%　　强烈的海杂波将海面低速运动小目标的回波信号淹没，导致雷达难以检测到目标。针对这一问题，该文提出了基于正交投影的恒虚警率(CFAR)检测方法。该方法利用邻近距离单元杂波的相关性，通过正交投影方法实现对杂波的抑制，进而实现 CFAR 检测。同时，该文给出了基于正交投影的 CFAR 检测器实现结构图，对比分析了正交投影方法与奇异值分解方法的杂波抑制效果和计算量。理论分析与实测数据处理结果验证了该文所提方法的优越性。