光电工程, 2016, 43 (12): 212, 网络出版: 2016-12-30  

利用多普勒激光雷达实现距离和速度同步测量

Doppler Laser Radar for Measuring Range and Speed Simultaneously
作者单位
武汉科技大学 汽车与交通工程学院,武汉 430081
摘要
针对车载激光雷达不能同步测量道路目标距离和速度的问题,提出使用伪随机码调制发射光源的幅度,通过计算反射回波与调制码的相关函数测量道路目标的距离,同时计算反射回波与本地信号的差频测量目标的速度。首先,给出车载激光雷达框图并讨论伪随机码调制激光雷达用于同步测距测速所固有的问题;然后,提出一种非等间隔采样信号频谱分析方法分析差频;最后,仿真验证这种频谱分析方法应用于激光雷达测距测速系统的可行性。结果表明,在不改变传统伪随机码调制激光雷达测距性能的基础上,该方法可以同步测量道路目标的速度,且最大可测量速度超过360 km/h。
Abstract
For solving the problem that vehicle laser radar cannot measure range and speed simultaneously, we proposed a method of modulating amplitude of transmitting laser by pseudo-random noise code. At the receiving end, we measure target range by calculating correlation function of laser echoes and the local modulating codes, and target speed by analyzing spectrum of beat signal between laser echoes and local reference signal. Firstly, we show the schematic diagram, and discuss the inherent problem existing in the pseudo-random noise code modulated laser radar. Then, we proposed a novel spectrum analysis method for calculating beat signal. Finally, we verified the feasibility of the proposed method by numerical simulations. The results show that maximum speed that can be measured can be extended to 360 km/h without reducing the range measurement performance of current laser radar.

方建超, 周兴林, 毛雪松. 利用多普勒激光雷达实现距离和速度同步测量[J]. 光电工程, 2016, 43(12): 212. FANG Jianchao, ZHOU Xinglin, MAO Xuesong. Doppler Laser Radar for Measuring Range and Speed Simultaneously[J]. Opto-Electronic Engineering, 2016, 43(12): 212.

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