一种改进的短时傅里叶算法实现  

Implementation of Modified Short-time Fourier Transform

作　　者：张辉[1] 范雪林[1] 李东风[1] 

机构地区：[1]中国电子科技集团公司第三十研究所,四川成都610041

出　　处：《通信技术》2017年第5期1066-1069,共4页Communications Technology

摘　　要：针对短时傅里叶变换在信号检测、参数估计、雷达脉内分析等领域的大量运用,在传统基于FFT运算的短时傅里叶变换基础上,提出了一种高时间分辨率、输出频率可选择且易于FPGA(Field-Programmable Gate Array,现场可编程门阵列)工程实现的改进短时傅里叶算法。该算法采用时域加滑动窗方式,结合递归运算完成信号时频变换,得到目标频率单谱线短时傅里叶变换结果。相较于传统短时傅里叶实现方式,所提算法具有处理时延低、时间分辨率高、资源占用少的特点。Aiming at the wide application of STFT（Short-time Fourier Transform） in the fields of signal detection, parameter estimation and radar pulse analysis, and based on traditional STFT of FFT algorithm, the Modified FPGA-based STFT algorithm with high time resolution, selectable output frequency and easy FPGA engineering implementation is proposed.By using shift windows in the time domain and combined with recursion operation for time-frequency transform, the result of single spectrum Short-time Fourier Transform is acquired. This proposed algorithm could reduce the processing time and computation complexity, and as compared with the traditional also have better time resolution.

关 键 词：短时傅里叶变换(STFT) 快速傅里叶变换(FFT) 高时间分辨率 现场可编程门阵列(FPGA) 

分 类 号：TN97[电子电信—信号与信息处理]