Contrast, spatial frequency, presentation time, moving velocity and phase reversal frequency of each grating are controlled independently.
每组光栅的对比度、空间频率、显示时间，移动速度和反相频率能单独控制。
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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