中文摘要：

弹道中段目标成像技术是弹道导弹防御系统的核心技术之一。由于弹道导弹中段飞行过程中具有空间进动形式，不满足小转角近似，导致RD算法成像模糊。该文提出一种进动旋转对称目标的宽带雷达成像方法，新方法通过后向投影变换将目标散射中心分布在距离时间域上的复数信号进行相干累加，实现目标散射中心的2维重构，该方法较广义Radon变换方法在抑制旁瓣性能上有较大的改进，利用暗室测量数据的实验结果验证了算法的有效性。

英文摘要：

The imaging method of the mid-course missile is one of the key techniques of the missile defense system. Cause of the special precession character of the ballistic missile warhead, the small rotation angle assumption is not satisfied, which leads to blurring of the image obtained by Range Doppler （RD） algorithm. To solve this problem, a novel wideband imaging method for precession targets with rotational symmetry is proposed in this paper. Using Back Projection Transform （BPT）, the echoes of the target in the range-time domain are transformed to reconstruct the scattering centers position in the parameter domain by means of coherent accumulation. The algorithm is verified by the experiment results of the anechoic chamber data, which demonstrates that the algorithm is more efficient than the Generalized Radon Transform （GRT） method.