CAJ | 학술논문

由于快速傅里叶变换(Fast Fourier Transform,FFT)算法不能精确反应信号的局部频谱特性,对此,本文以按时间抽取(DIT)的基-2FFT算法为基础,并参考基于FFT的布鲁斯坦(Bluestein)算法,设计了新的信号频谱分析软件,用于对实序列采样信号做线性调频Z变换,即频率抽样处在Z平面上,可沿任意螺线做频率抽样的频谱分析方法.结合工程实践对相同采样点数的信号在0-50Hz频率段做频谱分析,由频谱图可以看到,采用线性调频Z变换算法远比采用FFT变换算法求得信号的频谱更精确.
유우쾌속부리협변환(Fast Fourier Transform,FFT)산법불능정학반응신호적국부빈보특성,대차,본문이안시간추취(DIT)적기-2FFT산법위기출,병삼고기우FFT적포로사탄(Bluestein)산법,설계료신적신호빈보분석연건,용우대실서렬채양신호주선성조빈Z변환,즉빈솔추양처재Z평면상,가연임의라선주빈솔추양적빈보분석방법.결합공정실천대상동채양점수적신호재0-50Hz빈솔단주빈보분석,유빈보도가이간도,채용선성조빈Z변환산법원비채용FFT변환산법구득신호적빈보경정학.
FFT(fast fourier transform) algorithm can not present the characteristic of local spectrum precisely. Regarding this, in this paper was designed a new software for spectrum analysis, based on radix 2 based decimation in time FFT and Bluestein FFT algorithm, which realized chirp-z transform on real sequence sampling signa. The frequency spectrum analysis method that can frequency sample along the arbitrary spire in the Z-plane. in practice we do spectrum analysis to the same signal at the sampling points of 0-50Hz frequency bands, from the chart of spectrum. Results show that the Signal spectrum using Chirp Z Transform Algorithm is more accurate compared with using Transform FFT algorithm.