关键词: 参数估计, STFT, 时频谱图, 时频聚集性

Abstract:

As for the contradiction between resolution of time and resolution of frequency in FH signal parameter estimation,a new frequency-hopping signal parameter estimation method based on STFT is proposed by analyzing the influence of function window of STFT on the time-frequency spectrum.The method exploits the parameter of function window to extract the parameter of frequency-hopping signal directly avoiding the influence of time-frequency spectrum on the accuracy of estimation.The essence of this method is to seek the time-frequency spectrum which has the best time-frequency concentration and get the parameter of target function window by changing the time of beginning and the width of the function window.Simulation results show the method is efficient to estimate the parameter of frequency-hopping signals.

Key words: parameter estimation;STFT;time frequency spectrum;time frequency concentration