基于Hough变换改进的悬停直升机检测方法

基于Hough变换的悬停直升机常规检测方法,要求直升机主旋翼多个扫描周期的回波经过排列后严格位于同一直线上,而实际中直升机主旋翼旋转频率存在抖动,不能满足这一条件。文中通过对主旋翼旋转频率抖动的分析和建模,提出了一种改进的悬停直升机Hough变换检测方法。理论分析和仿真实验表明,该方法相对改进前的方法可以有效克服直升机主旋翼旋转频率抖动对检测性能的影响。

An Improved Method for Detecting Hovering Helicopter Based on Hough Transform

The conventional methods for detecting hovering helicopters based on Hough transform require the main rotor echoes from several scanning cycles be arranged exactly into a straight line,but in practice the rotation frequency of helicopter main rotor has random dithering,so the above requirement is not satisfied.In this paper an improved method for detecting hovering helicopters based on Hough transform is proposed through analyzing and modeling the random dithering of the rotation frequency of helicopter main rotor.Theoretical analysis and computer simulation show that compared with the conventional meothd,this method can effectively reduce the influence of rotation frequency dithering of helicopter main rotor on detection performance.