码分多址调制激光雷达抗干扰性能分析

Anti-Interference Performance Analysis of Modulated Light Detection and Ranging Using Code Division Multiple Access

激光雷达(LiDAR)抗干扰技术是实现安全无人驾驶的核心技术之一。分析了码分多址(CDMA)调制激光雷达系统的原理,比较了不同正交码组的特性,并通过仿真分析了该激光雷达在不同干扰下的抗干扰性能。实验结果表明,采用光正交码(OOC)的CDMA调制激光雷达具有较低的虚警率,可以有效抵抗传统单脉冲激光雷达干扰、同体制激光雷达干扰和较低功率、特定频率的调频连续波(FMCW)激光雷达干扰。此外,针对200个传统单脉冲激光雷达作为密集干扰源的场景,CDMA调制激光雷达的虚警率仅为0.11%,可以满足大规模无人驾驶应用中的抗干扰要求。

The anti-interference properties of the light detection and ranging(LiDAR) technology is a core aspect for realizing safe unmanned driving. Herein, the principle of modulated LiDAR system using code division multiple access(CDMA) is analyzed, the characteristics of different orthogonal code groups are compared, and the antiinterference performance of the CDMA-modulated LiDAR system is analyzed under different interferences by simulation. Experimental results show that the CDMA-modulated LiDAR system based on the optical orthogonal code(OOC) achieves a low false-alarm rate and can effectively resist the interference of conventional single-pulse LiDAR systems. Furthermore, it can effectively resist the same LiDAR system and the interference of the frequency-modulated continuous wave(FMCW) LiDAR system with low power and a specific frequency.Moreover, for 200 scenes where conventional monopulse LiDAR is used as the dense interferer, the false alarm rate of the CDMA-modulated LiDAR system is only 0. 11%, which can meet the anti-interference requirements of largescale unmanned applications.