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研究了一种基于时域射线追踪技术(Time Domain Ray Tracing)适用于大尺度室内环境传播建模的IR-UWB信号传播模型。该模型综合考虑室内传播存在的多径效应、阴影效应和穿墙效应等物理现象,引入墙体内部的时域传输系数和墙体至空气的时域透射系数,分析并解释了时域传播系数的物理意义。模型利用了IR-UWB信号时域极窄的特点,与传统的FDTD方法相比,能够显著提高大尺度环境下的计算效率。最后通过与实测结果的对比,验证了该模型的有效性,详细研究了模型的计算精度及误差成因。
An IR-UWB signal propagation model based on Time Domain Ray Tracing, which is suitable for large-scale indoor environment propagation modeling, is studied. The model considers physical phenomena such as multipath effect, shadow effect and wall penetration effect in indoor propagation, introduces the time domain transmission coefficient inside the wall and the time-domain transmission coefficient from the wall to the air, and analyzes and explains the time-domain propagation coefficient The physical meaning. The model takes advantage of the very narrow time domain of the IR-UWB signal. Compared with the traditional FDTD method, the model can significantly improve the computational efficiency in large-scale environments. Finally, compared with the measured results, the validity of the model is verified, and the calculation accuracy and error of the model are studied in detail.