时间-距离像消隐情况下弹道目标平动补偿

Translational Motion Compensation of Ballistic Target in the Case of Time-Range Profile Blanking

针对传统的弹道目标平动补偿方法不适用于时间-距离像发生消隐的情况,该文提出了一种基于断续微距离变化曲线的弹道目标平动精补偿方法。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的理论公式,分析了弹道目标时间-距离像特征,通过提取时间-距离像骨架线分离出各散射中心微距离变化曲线,在此基础上提出了一种进动频率和平动参数联合估计的新方法,并推导了各参数估计的克拉美罗界,对参数估计性能进行了分析。仿真实验验证了该方法的有效性。

In allusion to the problem that the traditional translational motion compensation methods are not suitable for the case of time-range profile blanking,a novel translational motion compensation method is proposed based on intermittent micro-range curve of ballistic target.The broadband echo model of the ballis-tic target in midcourse is established,the theoretical formula of intermittent micro-range curve is derived and the characteristics of ballistic target time-range profile are analyzed.Time-range profile skeleton lines are extracted and intermittent micro-range curve of scattering centers are separated.Based on this,a new method is put forward to estimate the precession frequency and the translational parameter simultaneously,and the Cramer-Rao Bound（CRB）of the parameter estimation is derived to analyze its performance.The effective-ness of the proposed method is verified by simulation results at last.