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一种基于时频域滤波的ISAR瞬时成像算法

An Instantaneous ISAR Imaging Algorithm Based on Time-Frequency Domain Filtering
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摘要 为了得到机动目标的瞬时像,需要采用时频分析的方法。分析了2种Cohen类时频分布Wigner-Ville分布(WVD)及Choi-Williams分布(CWD)的时频特性。基于时频域滤波的思想提出一种兼备高时频集聚性和交叉项抑制能力的瞬时频率估计方法。由此得到一种新的ISAR瞬时成像算法,对机动目标数据进行成像处理,结果说明了算法的优越性。 When targets move irregularly,time-frequency analysis is needed in order to obtain instantaneous images.Time-frequency distribution characteristics of Wigner-Ville distribution(WVD) and Choi-Williams distribution(CWD) are discussed,both of which are members of the Cohen s class.Based on the idea of time-frequency domain filtering a new instantaneous frequency estimation method is proposed which possesses the high time-frequency concentration of WVD and the cross-terms reduction ability of CWD.A new instanta...
作者 郑泽星 姜义成 ZHENG Ze-xing; JIANG Yi-cheng (Harbin Institute of Technology; Research Institute of Electronic Engineering Technology; Heilongjiang Harbin 150001; China);
出处 《现代防御技术》 北大核心 2008年第2期,共4页 Modern Defence Technology
关键词 时频分布 时频域滤波 逆合成孔径雷达瞬时成像 WIGNER-VILLE分布 Choi-Williams分布 time-frequency distribution time-frequency domain filtering instantaneous ISAR image WVD CWD
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