脉冲激光测距的时间间隔测量方法  

Method of Measurement on Time-Interval in Pulsed Laser Ranging

作　　者：陈瑞强[1] 江月松[1] 

机构地区：[1]北京航空航天大学电子信息工程学院,北京100191

出　　处：《光学学报》2013年第2期99-104,共6页Acta Optica Sinica

基　　金：国家973计划(2011CB707001)资助课题

摘　　要：时间间隔测量方法的优劣直接影响脉冲激光测距的性能。借鉴插值法的思想,提出了利用三角波参考信号的特点实现时间间隔测量的方法,具有测量范围大、测量精度高的优点。阐述了利用三角波参考信号实现时间间隔测量的原理,定量分析了影响时间间隔测量精度的因素,指出三角波参考信号的频率和噪声是影响测量精度的主要原因,并进行了数值仿真;设计实验方案验证了三角波参考信号中噪声对时间间隔测量精度的影响。仿真和实验结果表明,使用较低频率的三角波参考信号可以实现较高的时间间隔测量精度;提高三角波参考信号的频率或降低噪声,都可以有效提高时间间隔的测量精度。仿真和实验结果证实了时间间隔测量方法的可行性,为开展脉冲激光测距提供了一定的参考。The performance of pulsed laser ranging is directly influenced by the method how to measure the time- interval. Refer to the idea of interpolation time-interval measurement, the character of triangle reference signal is used to realize measurement on time-interval which has advantages of long measurement range and high precision. The principle how to use triangle reference signal to realize measurement on time-interval is described. The factors that affect the precision of time-interval measurement is quantitatively analyzed. It is pointed out that the frequency of triangle reference signal and the noise attached in triangle reference signal are the two main factors which affect the precision of time-interval measurement. Then, their affect on the precision of time-interval measurement is numerically simulated. A confirmatory experiment is designed to explain how the noise attached in triangle reference signal affects the precision of time-interval measurement. Both the numerical simulation and the experimental result show that the method of measurement on time-interval in pulsed laser ranging which uses low frequency triangle reference signal can achieve high precision. Besides, both improving the frequency of triangle reference signal and reducing the noise attached in triangle reference signal can effectively improve the precision of time-interval measurement. The numerical simulation and experimental results also confirm the feasibility of measurement on time- interval on pulsed laser ranging.

关 键 词：测量 时间间隔测量 三角波参考信号 噪声 测量精度 

分 类 号：TN249[电子电信—物理电子学]