The key of Ultra-wideband(UWB) technology lies in how to generate the fast rise-time and short-duration pulse.
超宽带（UW B）技术实现的关键之一是如何设计并产生可以控制的UW B极窄脉冲。
The PRFM pulse sequence is composed by 16 fixed-width and fixed-amplitude short pulses, in which the duration between two neighboring pulses is determined by pseudo-random number sequence.
此序列由16个固定宽度的高电平脉冲组成，两个相邻脉冲之间的低电平时间间隔是由伪随机数序列决定的。
Pulse: a regular, significant abrupt change of short duration in the level of an electric voltage or current.
脉动：电压或电流作有规则的，短暂的和明显的突然变动。
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