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。
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Software and hardware implementation of ranging was sum up including triangulation & parallax measuring, pulse current ranging and pseudorandom noise ranging.