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国产星载激光雷达森林回波波形模拟仿真 被引量:3

Simulation on Forest Echo Waveforms of Domestic Spaceborne LiDAR
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摘要 为探究拟发射国产星载激光雷达卫星波形数据在森林结构参数估测方面应用潜力,首先需对其回波波形进行模拟仿真。针对地形无规律起伏和林层结构复杂这一问题,本文采用有限元原理实现了随机地形与林分三维信息的模拟仿真;针对激光脉冲传输过程中能量衰减的问题,引入了激光雷达辐射传输模型;为验证本文所建回波仿真系统有效性,利用与国产星载激光雷达回波波形相近的ICESat-GLAS实测波形数据对GLAS仿真波形数据进行验证。研究结果为:发射波仿真波形与实测波形相关系数为0.96;地形坡度分别为0°~10°、10°~20°、20°~30°和30°以上时回波仿真波形与实测波形相关系数均值分别为0.90、0.88、0.85和0.81;郁闭度分别为0~0.2、0.2~0.4、0.4~0.6、0.6~0.8和0.8~1.0时回波仿真波形与实测波形相关系数均值分别为0.81、0.80、0.84、0.88和0.90;针叶林、阔叶林和混交林回波仿真波形与实测波形相关系数均值分别为0.85、0.86和0.89。研究结果表明:本文所建回波仿真系统可用于国产星载激光雷达回波仿真。回波仿真所得国产星载激光雷达仿真波形,可为森林结构参数估测研究提供数据支撑。 In the process of exploring the application potential of domestic satellite-borne LiDAR satellite waveform data in the estimation of forest structure parameters,simulating the received waveform of the satellite is a very important part of it.In the process of waveform simulation,to solve the problem of irregular terrain undulations and complex forest layer structure,the finite element principle was implemented to realize the simulation of random terrain and forest stand three-dimensional information.To solve the problem of energy attenuation during laser pulse transmission,the laser radar radiation transmission model was used.To verify the effectiveness of the built echo simulation system,the ICESat-GLAS measured waveform data,which was similar to the received waveform of the domestic spaceborne LiDAR,was used to verify the GLAS simulation waveform data.The research results showed that the correlation coefficient between the simulated waveform and the measured waveform of the transmitted wave was 0.96.When the errain slope was 0°~10°,10°~20°,20°~30°,and above 30°,the mean values of the correlation coefficients between the simulated received waveform and the measured waveform were 0.90,0.88,0.85,and 0.81,respectively.When the canopy closure was 0~0.2,0.2~0.4,0.4~0.6,0.6~0.8,and 0.8~1.0,the mean values of the correlation coefficients between the simulated received waveform and the measured waveform were 0.81,0.80,0.84,0.88,and 0.90,respectively.The mean values of correlation coefficients between the simulated received waveform and measured waveform of coniferous forest,broad-leaved forest and mixed forest were 0.85,0.86 and 0.89,respectively.The research results showed that the built echo simulation system can be used for domestic spaceborne LiDAR echo simulation.The simulation waveforms of domestic spaceborne LiDAR obtained can provide data support for the estimation of forest structure parameters.
作者 蔡龙涛 岳春宇 黄缙 贺涛 国爱燕 邢艳秋 CAI Longtao;YUE Chunyu;HUANG Jin;HE Tao;GUO Aiyan;XING Yanqiu(College of Engineering and Technology,Northeast Forestry University,Harbin 150040,China;Beijing Institute of Space Mechanics and Electricity,Beijing 100094,China;Remote Sensing Satellite General Department,China Academy of Space Technology,Beijing 100094,China)
出处 《农业机械学报》 EI CAS CSCD 北大核心 2022年第4期208-217,共10页 Transactions of the Chinese Society for Agricultural Machinery
基金 国家重点研发计划项目(2017YFD060090402、2021YFE0117700-6) 北京空间机电研究所开放基金项目 中央高校基本科研业务费专项资金项目(2572019AB18)。
关键词 星载激光雷达 回波仿真 有限元原理 随机地形 激光雷达辐射传输模型 domestic spaceborne LiDAR echo simulation finite element principle random terrain LiDAR radiation transmission model
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