简介:Anadaptiveapproachtoselectanalysiswindowparametersforlinearfrequencymodulated(LFM)signalsisproposedtoobtaintheoptimal3dBsignal-to-noiseratio(SNR)intheshorttimeFouriertransform(STFT)domain.AfteranalyzingtheinstantaneousfrequencyandinstantaneousbandwidthtodeducetherelationbetweenthewindowlengthanddeviationoftheGaussianwindow,high-orderstatisticsisusedtoselecttheappropriatewindowlengthforSTFTandgettheoptimalSNRwiththerighttime-frequencyresolutionaccordingtothesignalcharacteristicunderafixedsamplingrate.Computersimulationshaveverifiedtheeffectivenessofthenewmethod.