A time-frequency diagram is a commonly used visualization for observing the time-frequency distribution of radio signals and analyzing their time-varying patterns of communication states in radio monitoring and management. While it excels when performing short-term signal analyses, it becomes inadaptable for long-term signal analyses because it cannot adequately depict signal time-varying patterns in a large time span on a space-limited screen. This research thus presents an abstract signal time-frequency (ASTF) diagram to address this problem. In the diagram design, a visual abstraction method is proposed to visually encode signal communication state changes in time slices. A time segmentation algorithm is proposed to divide a large time span into time slices.Three new quantified metrics and a loss function are defined to ensure the preservation of important time-varying information in the time segmentation. An algorithm performance experiment and a user study are conducted to evaluate the effectiveness of the diagram for long-term signal analyses.
翻译:时间频率图是一种常用的可视化图,用于观测无线电信号的时间频率分布,分析无线电监测和管理中的通信状态的时间变化模式。在进行短期信号分析时,时间分布图是优异的。在进行短期信号分析时,它无法适应长期信号分析,因为它无法在一个空间限制的屏幕上在很长的时间内充分描绘信号时间变化模式。因此,这项研究为解决这一问题提供了一个抽象的信号时间-频率(ASTF)图。在图表设计中,建议采用视觉抽象方法,将时间切片中的信号通信状态变化进行视觉编码。建议采用时间分割算法,将一个大的时间间隔分成成时间切片。确定了三个新的量化尺度和损失函数,以确保在时间分隔中保存重要的时间变化信息。进行了算法性实验和用户研究,以评价长期信号分析图的有效性。