摘要
空间目标的高速轨道运动,会导致微动曲线的展宽和走动,将对后续的微动特征提取产生不利影响。针对这一问题,提出了一种基于离散匹配傅里叶变换(DMFT)的空间目标微动特征提取方法。首先分析了高速空间目标的信号回波模型;其次,根据回波信号的特点提出了一种基于DMFT的补偿参数估计的方法;最后,采用Hough变换提取了目标的微动特征。仿真实验验证了该方法的有效性和鲁棒性,结果表明微动特征的提取精度得到了明显提高。
The movement of space target with high speed can widen the main lobe of the range profile and introduce an offset to the spectrum peak,which will bring troubles to the following micro-Doppler feature extraction. To solve this problem,based on discrete match Fourier transform（ DMFT）,a compensation algorithm for range profile is proposed. Firstly,the echo model of high-speed space target is analyzed. Then,a method of compensation parameters estimation based on DMFT is proposed according to characters of the echoes. Finally,the micro-motion feature is extracted by Hough transform. Simulations are given to validate the effectiveness and robustness of the proposed method,and the precision of the obtained micro-motion features is improved greatly.
出处
《现代防御技术》
北大核心
2014年第6期42-47,共6页
Modern Defence Technology
基金
国家自然科学基金项目(61201369
61102109)
陕西省自然科学基础研究计划项目(2013JQ8008)
关键词
空间目标
离散匹配傅里叶变换
补偿
微动特征
space target
discrete match Fourier transform（DMFT）
compensation
micro-motion feature
