A new analysis of frequency hopped sequence based on time frequency presentation is proposed in the paper.

针对跳频信号的非平稳性，提出了基于时频表示的跳频信号分析方法。

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The simulation results presented prove that the performance of DFH system with signal detecting by sequence is much better than the conventional frequency hopped systems over Rayleigh fading channels.

结果证实了，差分跳频通信技术和按序列检测方法的结合，使通信系统在瑞利衰落信道条件下的性能得到了比较显著的提升。

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With adoption of the hopped-frequency pulses as a radar waveform for imaging targets, a novel algorithm for range-Doppler imaging of rotating targets is proposed.

该文采用跳频脉冲信号作为成像雷达信号形式，研究了一种雷达等效转台目标距离-多普勒成像的新算法。

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Only a receiver programmed with the same random sequence would be able to follow the signal as it hopped from one frequency to another.

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