研究了伪随机信号的特征及伪随机信号产生的方法，得出了用伪随机信号代替白噪声信号辨识钻柱系统脉冲响应的结论。
The results show that the input white noise can be substitute by pseudo-random signals in identifying the impulse response of a drill-string system.
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。
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.
使用完全正交的伪随机码代替单脉冲信号对超声信号进行调制，以提高发送信号的抗干扰能力和系统的测距精度；
The pseudorandom code instead of single impulse is used for modulation to improve the capability of anti-jamming and precision of measuring range.
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