摘要
为获得运动目标特征,基于目标多点散射模型推导了近程伪码调相连续波(PRC-CW)雷达回波多分量信号模型。在该模型基础上提出将运动目标的细微频谱结构作为该目标特征,并详细阐述了特征提取的方法。该方法在常用的脉压-快速傅里叶变换处理之后,利用频谱细化方法得到目标的细微频谱结构,然后通过梅林变换实现了该结构特征对于目标不同入射角情况下的尺度不变性。给出了实现过程框图。目标外场实测数据试验结果表明不同目标的细微频谱结构明显不同,反映了不同目标的结构特征。
A multi-component echo signal model of short-range pseudo random code continuous wave （PRC-CW） radar is presented based on target＇ s multi-points scattering model. An idea to take the moving target＇ s fine frequency structure as its feature is proposed based on the model presented above. The feature extraction method is illustrated, in which the fine frequency structure around the target＇ s main Doppler component is obtained by frequency zoom approach on the echo after conventional pulse compression-fast Fourier transform processing. Mellin transform of the frequency structure is calculated to implement the scale invariance property. The theoretical formula and implementation process are elaborated. Experimental results of practical targets indicate that the fine frequency structures of different targets vary obviously which reflect different targets＇ structure features.
出处
《南京理工大学学报》
EI
CAS
CSCD
北大核心
2008年第6期759-762,792,共5页
Journal of Nanjing University of Science and Technology
关键词
伪随机码
脉冲压缩
特征提取
梅林变换
pseudo random code
pulse compression
feature extraction
Mellin transform
