论文部分内容阅读
数字调幅广播(DRM)外辐射源雷达面临严重的多径杂波问题,其中不仅包含静止地面散射物引起的无多普勒频移多径杂波,还有经运动海面等散射引起的具有多普勒频移扩展的多径杂波。扩展相消杂波抑制类(ECA)算法常被用于无源雷达杂波抑制,但均仅针对无多普勒频移的多径杂波。文中建立了考虑多普勒频移扩展杂波的该无源雷达信号模型,结合信号波形特点提出了载波域ECA算法(ECA-C)的扩展算法,深入分析了扩展ECA-C算法的多径杂波抑制机理。该方法通过对各载波信号组成进行分析,构造相应的杂波子空间,利用子空间正交投影可同时对静止的和具有多普勒频移的多径杂波进行抑制,提高了系统的杂波抑制能力,进而改善了弱目标检测能力。理论分析和实测数据处理结果表明了该算法的优越性。
Digital Radiocommunication Radiation (DRM) radars face serious problems of multipath clutter, including not only Doppler-free multipath clutter caused by stationary surface scatterers but also those caused by scattering such as moving sea surface Doppler shift propagation of multipath clutter. Exhalation cancellation clutter suppression (ECA) algorithm is often used for passive radar clutter suppression, but only for Doppler clutter without Doppler shift. In this paper, the passive radar signal model considering Doppler shift extended clutter is established. Based on the characteristics of signal waveform, an extended algorithm of ECA-C is proposed. The multipath of extended ECA-C algorithm is further analyzed. Clutter suppression mechanism. This method analyzes the signal components of each carrier, constructs the corresponding clutter subspace, and suppresses the static and Doppler clutter with Doppler shift by orthogonal projection in subspace, and improves the clutter of the system Inhibit ability, thus improving the weak target detection capability. Theoretical analysis and measured data processing results show the superiority of this algorithm.