Title :
The optimal window length of STFT for sine modulated signal
Author :
He Si-san ; Zhao Hui-ning ; Zhou Jian-xiong ; Cheng Xiao ; Fu Qiang
Author_Institution :
ATR Lab., Nat. Univ. of Defence Technol., Changsha
Abstract :
The short-time Fourier transform (STFT), whose resolution depends on the window length, is the most frequently used time frequency representation to analyze signal with time-varying frequency content. The formula of calculating the optimal window length for sine modulated signal is deduced to make the maximal local bandwidth of the spectrogram reaches the minimal value. The results of some typical windows are calculated. Simulated results verify the correctness of the deduced formula.
Keywords :
Fourier transforms; radar resolution; signal representation; STFT optimal window length; radar resolution; short-time Fourier transform; sine modulated signal representation; spectrogram bandwidth; time-varying frequency analysis; STFT; micro-Doppler; rotation; window length;
Conference_Titel :
Radar Conference, 2009 IET International
Conference_Location :
Guilin
Print_ISBN :
978-1-84919-010-7
