Precession is the ballistic target' s most common micro-motion type, while the differences of precession characteristics provide a new approach to identify the real warhead and decoys. According to the characteristics of precession ballistic targets, the radial distance mathematic model is derived, and then, a novel method to extract the precession characteristics based on range-profile is proposed after analyzing the variation regularity of range profile peaks. The linear sum signal of scatters' radial distance is estimated from time-profile signal, and precession parameters can be extracted by the sum signal ' s spectral characteristics. Simulation results show that this method has the advantages of good anti noise performance and high estimating precision.%进动是弹道目标最常见的微动形式,进动特征的差异为雷达识别真实弹头和诱饵提供了一种新的途径.针对弹道目标的进动特性,推导了弹道目标上任意一散射点的进动径向距离变化数学模型.通过分析散射点一维距离像随时间变化的规律,提出了一种基于时间-距离像的弹道目标进动特征提取新方法.该方法首先从弹道目标时间-距离像信号中准确提取出所有强散射点径向距离变化的线性和信号,进而通过分析这一信号的频谱特性,估计出了弹道目标的自旋、锥旋频率及进动角.计算机仿真结果表明:该方法具有很高的估计精度和良好的抗噪性.
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