基于重排方法的跳频信号分析研究

跳频信号是一种非平稳信号,用时频分布来分析跳频信号是一种很有效的方法。然而,线性时频分析方法的时频分辨率受到测不准原理的限制很难同时得到兼顾,不利于跳频信号的分选和参数的估计。文章利用重排方法对时频变换后的时频谱图进行处理,通过仿真可以看出,重排后时频谱图具有良好的时频聚集性,频率分辨率损失(RL)最大可以改善6dB左右,提高了时频谱图的可读性。

Reassignment-Based Frequency Hopping Signal Time-Frequency Analysis

The FH signal is a non-stationary signal, One of the effective methods of analysis of FH is time-frequency analysis. But, for the uncertain theory, the time and the frequency distinguishing can not reach well in the same time, it is not propitious to the select of the signal and the estimation of the parameters. In this paper, the reassignment method is used to adjust the time-frequency spectrum.The simulations indicate that the spectrum of the reassignment has well time frequency collective feature for FH signal and it can get about 6 dB gain for the Frequency Reassignment Losing(RL). It is propitious to the select of the signal and the estimation of the parameters.