基于抗混叠CZT变换的宽带相关副本快速算法

A Broadband Correlative Ectypal FFT Algorithm Based on Anti-Confusion Chirp Z Transform

信号处理过程中,系统常预先存储相关副本。但对于目标速度较高且对速度估计精度要求高时,则需要存储较多不同尺度的副本信号。副本存储会给系统带来较大的负担,因此寻求实时的副本快速算法是必要的。针对多速率采样难以实现宽带相关处理副本求解的问题,提出了通过CZT变换求解宽带相关副本FFT的计算方法。针对目标回波尺度大于1时造成的副本FFT混叠问题,提出了基于抗混叠CZT变换的宽带相关副本快速算法,并完成了算法的仿真与验证。仿真结果表明,基于抗混叠CZT变换的副本快速算法能准确高效地求取宽带相关副本FFT变换的结果。

During signal processing, a large number of correlative ectypes with different scales are prestored in system, especially for high-speed target and high precision estimation of velocity. The storage of ectypes burdens hardware system heavily. In order to solve the problem that the multi-velocity sampling is difficult to calculate the broadband correlative processing ectypes, a calcula- tion method based on the anti-confusion chirp Z transform（CZT） is presentedfor broadband correlative ectype fast Fourier transform（FFI＇） in this paper. However, the broadband correlative ectype FFT will bring transform confusion when ectypal scale a 〉 1, therefore a fast algorithm based on anti-confusion CZT is proposed. Simulation results indicate that the proposed algorithm can calculate the broadband correlative ectype FFT efficiently and accurately.