HRRP代价函数优化方法的弹道导弹特征参数提取

发布时间：2018-01-14 07:39

本文关键词：HRRP代价函数优化方法的弹道导弹特征参数提取　出处：《信号处理》2017年07期 　论文类型：期刊论文

【摘要】：进动角和进动周期是识别真假弹头的重要参数。为了提高进动参数的提取精度,提出了一种基于一维距离像的弹道导弹进动参数的提取方法。考虑到高速平动对HRRP的影响,建立了飞行中段弹头的进动模型。对一维距离像序列的最大互相关函数进行FFT变换,并对变换后的结果进行近似正弦波的频偏校正处理,得到进动周期估计值;利用频率阈值校正非频率分辨率整数倍的进动频率,提高了进动周期的提取精度。同时给出了径向长度的代价函数,将频偏校正提取的进动周期作为初始值,采用梯度下降法不断更新特征参数,最终得到进动角、进动周期、锥体高度、底面半径、方位角和俯仰角等参数值。通过仿真分析,与现有的几种提取方法比较,该方法进一步提高了提取精度。
[Abstract]:Precession angle and precession period are important parameters to identify true and false warhead in order to improve the precision of precession parameter extraction. A method for extracting the precession parameters of ballistic missile based on one-dimensional range profile is proposed, considering the influence of high-speed translation on HRRP. In this paper, the precession model of warhead in mid-flight is established. The maximum cross-correlation function of one-dimensional range image sequence is transformed by FFT, and the frequency offset correction of approximate sine wave is carried out. The precession period estimate is obtained. Frequency threshold is used to correct the precession frequency of integer times of non-frequency resolution, and the precision of precession period is improved. At the same time, the cost function of radial length is given, and the precession period extracted by frequency offset correction is taken as the initial value. The gradient descent method is used to update the characteristic parameters, and finally the parameters such as precession angle, precession period, cone height, bottom radius, azimuth and pitch angle are obtained. Compared with the existing methods, this method improves the precision of extraction further.
【作者单位】：南京航空航天大学电子信息工程学院;
【分类号】：TJ761.3;TN957.51
【正文快照】： 1引言导弹飞行中段会释放诱饵和碎片,识别真弹头和诱饵成为重点研究问题。其中弹头和重诱饵为了进行姿态控制将产生进动。轻诱饵和碎片可以根据无规律的(Radar-Cross Section,RCS)序列进行区分。因此如何区分弹头和重诱饵成为研究热点。弹头和重诱饵在质量分布方面具有重要差

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