摘要
介绍了一种基于DSP的伪随机序列超声扩频测距的实现方法。伪随机序列与超声载波采用ASK调制方式,利用包络检波法从超声回波中恢复出伪随机序列,并借助DSP芯片快速处理的优越性能,通过对伪随机序列进行相关运算,得到超声波的传播时延,从而根据超声测距原理比较精确地测量距离。
A realization method for pseudo-random sequence ultrasonic spread spectrum distance measurement based on DSP is introduced. The ultrasonic carrier is modulated by the pseudo-random sequence adopting ASK modulation mode, and the pseudo-random sequence is recovered from the ultrasonic echo through envelope demodulation. By its superior processing feature,a DSP chip is used to carry out the correlation calculation of the pseudo-random sequences, through which the TDE （Time Delay Estimation） is acquired. The distance measurement can be finished accurately in accordance with the ultrasonic distance measurement theory.
出处
《机械工程与自动化》
2008年第5期125-127,共3页
Mechanical Engineering & Automation
关键词
超声波测距
伪随机序列
包络检波
ultrasonic distance measurement
pseudo-random sequence
envelope demodulation
