When a missile-borne radar system works in downward-looking surveillance mode, the broadened ground clutter signal in virtue of platform high-speed motion will be received by the radar receiver, which will cause difficulty in moving target detection and attacking. Unlike airborne and spaceborne platforms, a missile-borne platform exhibits some unique motion characteristics, such as diving, spinning, and coning, causing the clutter space–time distribution property significantly different from those of airborne and spaceborne radar platforms. In addition, the forward target striking requirements make the missile-borne clutter space–time spectrum further exhibit the severe range-dependent property. To deal with these issues, accurate motion modeling of a missile-borne radar platform is first carried out in this article, where the complex platform motions including forward-looking diving, spinning, and coning are considered. Then, the autocorrelation processing combined with iterative adaptive approach is applied to estimate the clutter angle-Doppler center frequencies, so as to effectively realize the clutter nonstationary compensation along spatial and temporal directions. Finally, a time-domain sliding window-based subspace projection method is proposed to achieve the robust clutter suppression. Both simulation and real-measured radar data processing results are presented to validate the effectiveness and feasibility of the proposed algorithm.

中文翻译：

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弹载雷达系统的多通道杂波建模、分析和抑制

弹载雷达系统在下视监视模式下工作时，雷达接收器会接收到平台高速运动而展宽的地杂波信号，这将导致运动目标检测和攻击困难。与机载和星载平台不同，弹载平台表现出一些独特的运动特性，如俯冲、自旋和锥形，导致杂波时空分布特性与机载和星载雷达平台显着不同。此外，前方目标打击要求使得弹载杂波时空谱进一步表现出严重的距离依赖特性。针对这些问题，本文首先对弹载雷达平台进行精确运动建模，其中考虑了复杂的平台运动，包括前视俯冲、旋转和锥形。然后，应用自相关处理结合迭代自适应方法估计杂波角-多普勒中心频率，从而有效地实现杂波在空间和时间方向上的非平稳补偿。最后，提出了一种基于时域滑动窗口的子空间投影方法来实现鲁棒的杂波抑制。给出了仿真和实测雷达数据处理结果，以验证所提算法的有效性和可行性。从而有效地实现杂波沿时空方向的非平稳补偿。最后，提出了一种基于时域滑动窗口的子空间投影方法来实现鲁棒的杂波抑制。给出了仿真和实测雷达数据处理结果，以验证所提算法的有效性和可行性。从而有效地实现杂波沿时空方向的非平稳补偿。最后，提出了一种基于时域滑动窗口的子空间投影方法来实现鲁棒的杂波抑制。给出了仿真和实测雷达数据处理结果，以验证所提算法的有效性和可行性。