High-precision infrared pulse laser ranging for active vehicle anti-collision application
High-precision infrared pulse laser ranging for active vehicle anti-collision application
复制标题
DOI：
10.1109/iceice.2011.5777775
复制
发表时间：
2011-04
期刊：
影响因子：
--
通讯作者：
Yandong Chen;Zhiqiang Meng;Jingling Liu;Heping Jiang
中科院分区：
文献类型：
--
作者：
Yandong Chen;Zhiqiang Meng;Jingling Liu;Heping Jiang
针对汽车主动防撞应用，提出了一种基于FPGA和单片机Atmel16的高精度红外脉冲激光测距系统，并在脉冲激光飞行时间测量原理的基础上，对系统中的光学器件、激光接收部件、飞行时间展宽部件等关键技术进行了深入研究。详细分析了光的能量传输，选择合适的发射和接收激光二极管。特别是采用了基于恒流源对高精度电容充放电的时间展宽方法来实现关光时间的测量。系统样机的实际运行和测试结果表明，该系统的测距精度为±0.1m，重复频率为1kHz，测距范围从1.5m扩展到60m。因此，该系统能够准确地检测出汽车之间的距离，能够有效地避免交通事故的发生，具有很大的实用价值和经济价值。
In this work, a high-precision infrared pulse laser ranging system based on FPGA and microcontroller Atmel16 is proposed for active vehicle anti-collision application, and the key technologies of this system including optical device, laser receiver component, and time-of-flight stretching component are studied deeply based on the principle of the pulse laser time-of-flight measurement. The light energy transmission is analyzed in detail to choose the proper transmitted and receiver laser diode. Specially, the method of the time stretching based on the charge and discharge of the high-precision capacitor using the constant-current sources is adopted to realize the measurement of time-off-light. The practical running of system prototype and test results show that the precision is ±0.1m, the repetition rate is 1 kHz, and the distance measurement range is up to 60 m from 1.5 m. So, this system can accurately detect the distance between the cars, and can efficiently avoid traffic accident, therefore, this system has greatly practical and economic value.