基于短时哈特莱变换的跳频信号时频分析

根据哈特莱变换对于实信号频谱分析的高效性,本文针对跳频信号的非平稳性特征,给出了短时哈特莱变换定义,推导出短时哈特莱变换的递推计算式,并在分析短时哈特莱变换与短时傅立叶变换关系的基础上,应用短时哈特莱变换对跳频信号进行了时频分析。计算机仿真结果表明,该方法能够有效地跟踪频率随时间快速跳变的跳频信号。

Time-Frequency Analysis of Frequency-Hopping Signals Based on Short-time Hartley Transform

Analysis of frequency-hopping signals is crucial for scouting,identifying and jamming frequency-hopping communica- tion system in electronic warfare.Considering Hartley transform's effectiveness in analyzing frequency spectrum of real-valued signal, this paper introduced the short time Harfley transform(STHT)and inferred recursive relations for computing.Based on the relations of STHT and STFT,we used STHT to analyze frequency-hopping signals.Computer simulating results have shown that it is effective to an- alyze and trace FH-SS signal in both time and frequency domain.