时间距离像消隐时弹头进动与结构参数估计

Precession and Structural Parameters Estimation of the Warheah in the Case of Time-Range Profile Blanking

考虑弹道目标时间距离像存在消隐现象,提出了一种弹道目标微距离变化曲线断续时进动与结构参数提取方法。首先,建立了弹道中段目标宽带回波模型,推导了散射中心微距离变化曲线理论公式;其次,提取了时间距离像中各散射中心的微距离变化曲线,据此提出采用选点方法实现目标进动频率和平动参数联合估计,完成了弹道目标时间距离像的平动补偿;最后,利用扩展Hough变换方法进行补偿后断续微距离变化曲线的检测,基于各散射中心间的相对位置信息实现了弹道目标的结构参数提取。电磁仿真实验验证了该方法的有效性。

Considering the blanking phenomenon of the ballistic target＇s time-range profiles,a novel method for precession and structural parameters estimation is proposed based on intermittent micro-range curves. Firstly,the broadband echo model of the ballistic target in midcourse is established,and the theoretical formula of micro-range curve for precession target is derived. Secondly,the selecting point method is adopted to estimate the precession frequency and the translational parameter simultaneously; then,the translational motion of the ballistic target＇s time-range profiles is compensated. Finally,the intermittent micro-range curves after compensation are detected by generalized Hough transform（ GHT）,and precession and structural parameters of ballistic target is extracted based on the relative location information of the scattering centers. The effectiveness of the new method is verified by electromagnetic simulation results.