中国空间科学技术2023，Vol.43Issue(6)：135-141,7.DOI:10.16708/j.cnki.1000-758X.2023.0092
陆地生态碳卫星植被激光雷达大动态激光探测技术
Large dynamic laser detection technology of lidar mounted on terrestrial ecological carbon satellite
彭欢 1倪建军 1孙立 1杨居奎 1张靖涛1
作者信息
摘要
Abstract
The terrestrial ecosystem carbon monitoring satellite is China's first satellite with forestry remote sensing as its main application.The satellite is equipped with a 5-beam full waveform sampling lidar based on the pulse time-flight ranging system.In order to meet the high fidelity,large dynamic and high precision measurement of forestry,a dual-channel laser detection system with"fixed gain+variable gain"was designed.The detection system has the characteristics of high bandwidth(80MHz),high sampling rate(1.2 GHz),high quantization bits(12 bit),and the dynamic range covers more than 40 dB to ensure the undistorted recording of the laser signal.Based on highly stable(10-8)constant crystal oscillator,the time measuring unit achieved measuring accuracy better than 300 ps through efficient waveform extraction and high-precision centroid extraction algorithm.The relative delay of dual-channel laser detection system was calibrated,and the fusion application of dual-channel data was proposed.The lidar has been running for 1 year,and the accuracy of ranging is better than 0.15 m.关键词
陆地生态碳卫星/激光雷达/植被/大动态/双增益Key words
the terrestrial ecosystem carbon monitoring satellite/lidar/forestry/large dynamic/double gain分类
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彭欢,倪建军,孙立,杨居奎,张靖涛..陆地生态碳卫星植被激光雷达大动态激光探测技术[J].中国空间科学技术,2023,43(6):135-141,7.
