实时背景噪声补偿的激光雷达能见度仪设计

摘要

Based on the method of real-time background noise compensation,a lidar for visibility measurement,named as laser visibility meter is designed. The system adopts a modular design concept,and takes the embedded computer PCM-3370 as the control and data processing core. To deal with the signal-to-noise ratio degrading under the strong background light,a new method that combines the real-time background noise compensation with the moving average method using threshold segmentation is adopted to process the signal,which greatly improves the signal-to-noise ratio.Finally,the accuracy and effectiveness of the design is verified by numerical simulation and field tests.%基于实时背景噪声补偿的方法，设计了一台激光雷达能见度仪。该系统采用了模块化的设计思想，以嵌入式计算机PCM-3370作为系统的控制和数据处理单元，通过门控电路控制系统各模块的工作时序。针对强背景光照条件下信噪比恶化的实际情况，采用了一种新的实时背景噪声补偿与采用阈值分割的移动平均法相结合的方法处理信号，大幅度地提高了信噪比。最后通过数值仿真和外场对比试验，验证了本设计的准确性和有效性。