Any object and phenomenon in the physical world exists in the domain of time, so time is a fundamental concept in human experience.

客观世界中的各种事物，现象都是存在于一定的时间之中，因此时间是人类经验中的一个基本概念。

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A concept of Ultra wideband radar signal is proposed, and then a time domain imaging algorithm is presented to reconstruct far field images of conducting objects.

给出超宽带雷达信号的概念，提出由超宽带雷达信号散射远场重建理想导体目标简捷的时域成像公式和实现算法。

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The concept of time domain parameter is defined.

提出了时域参数的概念。

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