基于伪随机码调制的车载激光雷达距离速度同步测量方法

发布时间：2018-06-29 19:30

本文选题：车载激光雷达 + 伪随机码调制　；参考：《计算机应用》2017年03期

【摘要】：针对双检测器激光雷达系统用于同步测量道路目标距离和速度时存在的成本高、回波利用效率低的问题,提出了一种基于伪随机(PN)码调制的脉冲式多普勒激光雷达结构模型,研究使用单个光外差接收器同步测量目标距离和速度的可行性并通过计算机仿真验证方法的性能。首先,给出激光雷达的系统模型,分析模型在脉冲方式下用于距离和速度测量时存在的问题;然后,讨论通过单个光外差接收器输出的电信号计算目标距离和速度的方法,即计算输出信号与本地调制码的相关函数确定激光飞行时间进而得出目标距离和使用非等间隔采样信号频谱分析方法确定输出信号的多普勒频率进而得出目标的速度;最后通过仿真验证所提出的方法可同时实现目标距离和速度的稳定检测。实验结果表明,在道路环境中该方法可实现目标距离和速度的稳定可靠测量,与直接检测系统相比,测量的灵敏度可提高10 dB以上,且与回波的到达时间、多普勒频率的大小无关。
[Abstract]:In view of the high cost of measuring the distance and speed of the road targets and the low efficiency of the echo utilization, a pulsed Doppler lidar structure model based on pseudo random (PN) code modulation is proposed to study the simultaneous measurement of the target distance and velocity using a single optical heterodyne receiver. The performance of the method is verified by computer simulation. First, the system model of laser radar is given, and the problems in the measurement of distance and speed are analyzed in the pulse mode. Then, the method of calculating the distance and speed of the target by the signal output by a single optical heterodyne receiver is discussed, that is to calculate the output signal and the local area. The correlation function of the modulation code determines the laser flight time and then obtains the target distance and uses the non equidistant sampling signal spectrum analysis method to determine the Doppler frequency of the output signal and then obtains the target speed. Finally, the simulation verification method can simultaneously realize the stable detection of the target distance and speed. The experimental results show that the method can achieve the stability of the target distance and speed. In the road environment, the method can achieve a stable and reliable measurement of the distance and velocity of the target. Compared with the direct detection system, the sensitivity of the measurement can be increased by more than 10 dB, and is independent of the arrival time of the echo and the size of the Doppler frequency.
【作者单位】：武汉科技大学信息科学与工程学院;
【基金】：国家自然科学基金资助项目(61605147) 湖北省自然科学基金资助项目(2014CFB815)~~
【分类号】：TN958.98

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