光子学报, 2018, 47 (3): 0301002, 网络出版: 2018-02-01
机载激光测深雷达中大动态范围信号的多通道处理技术
Multi-channel Processing Technology for Wide Dynamic Range Signal in Airborne Lidar Bathymetry
激光雷达 海洋测深学 多通道 回波 大动态范围 数据拼接方法 拟合算法 Lidar Bathymetry Multi-channel Echo Wide dynamic range Data stitching method Fitting algorithm
摘要
为实现大动态范围信号的有效接收, 设计了一种三路并行的信号处理架构, 分别设置为低、中、高三种不同增益, 以实现不同水深下不同幅度的回波信号处理.同时利用数据拼接方法以及一种基于五角函数和高斯函数组合的拟合算法综合处理三路数据并进行水深评估.基于Wa-LID回波仿真模型得到回波数据, 验证多路并行处理架构的实用性.仿真结果表明, 本文提出的多通道处理技术可测信号的动态范围达86.9 dB, 对应的最大测深为26 m, 测量偏差为1.6 cm 至4.7 cm, 标准差小于1.1 cm.可有效应用于机载激光雷达测深系统.
Abstract
Three-channel processing structure was proposed to extend the input dynamic range. Each channel is set up with low, middle or high gain according to the echo intensity from different water depth. Afterwards, a data stitching method and a new fitting approach with the combination of pentagonal and Gaussian function are applied to each three-channel waveform to estimate the depth of water. The multi-channel processing structure was verified on the simulated data sets obtained from the existing Wa-LID waveform simulator. The simulated result has shown that the effective input signal is up to 86.9 dB dynamic range in this new processing technique, and the measured depth reaches 26 m. The bias of the bathymetry estimates is ranging from 1.6 to 4.7 cm with the standard deviation better than 1.1 cm. This multi-channel processing technology can be effectively used in ALB.
李杰, 赵毅强, 叶茂, 胡凯, 谢绍禹, 薛文佳, 周国清. 机载激光测深雷达中大动态范围信号的多通道处理技术[J]. 光子学报, 2018, 47(3): 0301002. LI Jie, ZHAO Yi-qiang, YE Mao, HU Kai, XIE Shao-yu, XUE Wen-jia, ZHOU Guo-qing. Multi-channel Processing Technology for Wide Dynamic Range Signal in Airborne Lidar Bathymetry[J]. ACTA PHOTONICA SINICA, 2018, 47(3): 0301002.