摘要
激光测距中,时间间隔的测量精度对测距精度起决定作用。针对时间间隔的测量精度问题提出了一种基于TDC-GP1计数芯片高精度测量方法,把时间间隔直接转化为高精度的数字,并结合软硬件的实现方法,通过DSP芯片控制TDC-GP1进行单通道的时间间隔测量,由内部粗计数器和精延时通道合作完成时间间隔测量,直接将待测时间间隔转换成数字量读出。实验结果表明,该模块测量频率快,单脉冲测量精度可达100 ps以内,线性度良好,可满足不同应用中的测速和精度要求。
Measurement accuracy of time interval plays a decisive role in ranging accuracy in laser ranging process. According to measurement accuracy of time interval, a high accuracy measurement method is proposed based on TDC-GP1 counting chip. Time interval is directly converted into high accuracy number. Incorporated with the implement methods of software and hardware, TDC-GP1 is controlled by DSP chip to perform time interval mea- surement of single-channel. Time interval measurement process is completed by inner coarse counters and fine delay time channels. Time interval to be tested is directly converted into digital readout. The experiment results show that the module has fast measurement frequency, good linearity, and the single pulse measurement accuracy is less than 100 ps, which can meet the requirements of speed measurement and accuracy in different applications.
出处
《光电技术应用》
2013年第1期60-65,共6页
Electro-Optic Technology Application
