数据采集与处理2013，Vol.28Issue(4)：450-453,4.
脉冲多普勒雷达中补零FFT与折叠FFT的性能比较
Performance Comparison of Zero-Filled FFT and Folded FFT in Pulse Doppler Radar
摘要
Abstract
The number of coherent pulses in the pulse Doppler radar is not often an integer power of 2,so it is required to fill zeros behind the pulses or fold the pulses when fast Fourier transform (FFT) is performed.The analytical relation between the zero-filled FFT and the folded FFT is firstly derived,and it is found that extracting the even frequency points of the zerofilled FFT leads to the folded FFT.Then the spanning losses of two kinds of FFT are computed and the loss of the folded FFT is larger than that of the zero-filled FFT because of the above extraction operation.In addition,in the statistical sense,the number of false alarm of the zero-filled FFT is twice that of the folded FFT,so a higher detection threshold for the zerofilled FFT is required.But it is calculated that the difference of two thresholds is only among 0.16～0.32 dB.关键词
脉冲多普勒雷达/补零FFT/折叠FFTKey words
pulse Doppler radar/ zero-filled FFT/ folded FFT分类
信息技术与安全科学引用本文复制引用
陈希信,孙俊,龙伟军..脉冲多普勒雷达中补零FFT与折叠FFT的性能比较[J].数据采集与处理,2013,28(4):450-453,4.基金项目
国家自然科学基金(61071164,61071163,61271327)资助项目. （61071164,61071163,61271327）
