2010•Tance yu kongzhi xuebaoRequires access

A Time-frequency Representation Method of STFT with Combining Window Functions

Feng Chang-jian

Abstract

Time resolution and frequency resolution of STFT with fixed length time window function restrain each other,which affects the time-frequency resolution.A method of combining window functions for STFT was proposed to solve this problem.Based on Heisenberg uncertainty principle,by using long,short window function,two sets of STFT time-frequency representation was obtained respectively.The final time-frequency representation was determined by the product of two time-frequency representation.The simulation frequency hopping signal and the vibration signal of telemetry processing results showed that the combination of window functions for STFT improved the time-frequency resolution of STFT effectivelly,which is especially suitable for frequency hopping signal analyse.

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Key concepts: Short-time Fourier transform, Window function, Time–frequency representation, Time–frequency analysis, Representation (politics), SIGNAL (programming language), Fourier transform, Resolution (logic)