HRRP代价函数优化方法的弹道导弹特征参数提取  

HRRP Cost Function Optimization Method for Ballistic Missile Feature Parameter Extraction

作　　者：孙善丽 周建江[1] 夏伟杰[1] SUN Shan-li ZHOU Jian-jiang XIA Wei-jie(College of Electronical and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 210016, China)

机构地区：[1]南京航空航天大学电子信息工程学院,江苏南京210016

出　　处：《信号处理》2017年第7期1018-1025,共8页Journal of Signal Processing

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。Precession angle and precession period are important parameters for identifying the true warhead. In order to im- prove the accuracy of extracting the precession parameters, a new method was proposed to extract the parameters of preces- sion of ballistic missile based on HRRP. Considering the influence of high speed translation on the HRRP, a mideourse warhead precession model is established. The maximum cross-correlation function of the one-dimensional range sequence is subjected to FFT transform and the transformed result is subjected to the approximate sine wave frequency offset correction process to obtain the precession period estimation value. The frequency threshold is used to correct the non-integer frequen- cy resolution of precession frequency, which improves the extraction accuracy of the precession period. At the same time, the cost function of radial length is given. The precession period of frequency offset correction is taken as the initial value, and the characteristic parameters are updated by gradient descent method. Finally, the parameters such as precession an- gle, precession period, cone height, bottom radius, azimuth and pitch angle are obtained. Compared with the presented papers, the accuracy of precession parameters is improved.

关 键 词：弹道导弹 一维距离像 频偏校正 进动参数 代价函数 

分 类 号：TN957.51[电子电信—信号与信息处理]