宽带单脉冲雷达实测数据三维成像的平面视觉形态表示

Denotation by Visual Modality in Plane for Three-dimensional Imaging with Real Data of Broadband Mono-pulse Radar

针对宽带单脉冲雷达实测数据三维成像结果难以直观表示的问题,研究了平面视觉形态表示方法。所谓平面视觉形态,是指用设想的人眼沿着雷达波束方向观测得到的目标结构向适当平面的投影。为获得波束依赖平面视觉形态表示,给出了从实测数据中计算雷达波束方向的方法并从目标尺寸准确估计的角度分析了获取雷达波束方向的必要性,在确定波束方向的基础上,根据投影平面确定新的坐标系,并给出了从雷达观测坐标系到新坐标系的坐标旋转方法。给出了某民航飞机实测数据三维成像处理结果在雷达观测坐标系中的投影表示和新坐标系中的平面视觉形态表示,通过两种表示的对比分析,显示了平面视觉形态表示对特征提取的价值。

In order to solve the problem that three-dimensional imaging result with real data of broadband mono-pulse radar cannot be displayed directly,an expressive method using visual modality in plane was studied.The visual modality in plane is the projection of target structure which was obtained by hypothetic people＇s eyes when they observed target according with direction of radar beam.In order to obtain the expression with visual modality in plane,firstly,the method for calculating direction of radar beam from real data was given and the necessity for obtaining the beam direction was analyzed by considering the exact estimation of target＇s size.Secondly,under the basis of having obtained the direction of beam,a new reference frame was formed according to the plane for projection and the method of coordinate rotation from reference frame in radar observation to new reference frame was also presented.In the end,three-dimensional imaging results of some real data for planes in civil aviation were presented with projection in reference frame in radar observation and visual modality in plane in new reference frame respectively,the comparison between two kinds of expression brings forth the value of denotation by visual modality in plane for acquisition of characteristic.