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

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。

A synthetic wideband radar imaging system using discrete time scale transformation technology

Based on the discrete time scale transformation technol ogy, a new airborne radar imaging system available to the synthetic wideband sig nal form is proposed. By using scale transformation matrix, different Doppler fr equencies relating to the same moving target over each subband can be transforme d to a known frequency so as to remove Doppler dispersion effect. In this way, a ll subbands are able to apply the same traditional Doppler filter bank structure in order to acquire distortionless synthetic range profile(SRP). At the same ti me, a corresponding fast computing algorithm is deduced by using FFT and CZT alg orithm. The simulation results show the effectiveness and efficiency of the prop osed method.