一种使用离散时间尺度变换技术的合成宽带雷达成像系统  

A Synthetic Wideband Radar Imaging System Using Discrete Time Scale Transformation Technology

作　　者：魏麟[1] 

机构地区：[1]中国民航飞行学院航空工程学院,四川广汉618307

出　　处：《电讯技术》2011年第9期39-43,共5页Telecommunication Engineering

摘　　要：基于离散时间尺度变换技术,提出了一种新的适用于合成宽带信号的机载雷达成像系统。为了消除多普勒散布效应,该系统使用了尺度变换矩阵,将同一目标在不同子带上的多普勒频率变换到一个已知的频率上,以便每一个子带可使用相同的传统多普勒滤波器组形式去获得无失真的合成距离像。同时,利用FFT及CZT算法,进一步推导出尺度变换矩阵的一种快速实现算法。实验仿真结果验证了所提方法的有效性。Based on the discrete time scale transformation technology, a new airborne radar imaging system available to the synthetic wideband signal form is proposed. By using scale transformation matrix, different Doppler frequencies relating to the same moving target over each subband can be transformed to a known frequency so as to remove Doppler dispersion effect. In this way, all subbands are able to apply the same traditional Doppler filter bank structure in order to acquire distortionless synthetic range profile（SRP）. At the same time, a corresponding fast computing algorithm is deduced by using FFT and CZT algorithm. The simulation results show the effectiveness and efficiency of the proposed method.

关 键 词：机载雷达 合成距离像 宽带信号处理 离散时间尺度变换 多普勒滤波器组 

分 类 号：TN959.6[电子电信—信号与信息处理]