Radar Sea Clutter Suppression and Target Indication with a Spatial Tracking Filter

It is an important issue to study sea clutter suppression because it could interfere with the detection of targets above the sea surface severely. Spatial spectrum analyses show that the majority of sea clutter has low-frequency characteristics, compared to the high-frequency characteristics of the targets. This paper proposes a frequency-based spatial tracking filter to suppress sea clutter to facilitate targets identification. Experimental results show that the signal-to-clutter ratio can increase by more...     

薄壁管NC弯曲加工中芯轴的设计与运动学仿真

在薄壁管的NC绕弯加工中,最小弯曲半径由芯轴的结构特点和连接方式确定,弯曲半径的值决定了芯轴块间是否发生碰撞干涉.通过分析芯轴的解析几何模型,建立了发生碰撞干涉时最小弯曲半径的数学方程,采用Matlab对方程进行求解得到最小弯曲半径的值.同时建立芯轴的运动学仿真模型,并基于OBB二叉树算法快速准确的完成碰撞干涉检测.芯轴的运动学仿真结果与Matlab的计算结果具有很好的一致性.