基于波形匹配的高分七号星载激光测高仪山地区域脚点定位方法研究  

A waveform matching-based method of improving laser footprint geolocation for GaoFen-7 spaceborne laser altimeter in mountainous areas

作　　者：伍煜 王恒 韩启金[2] 龙小祥 马跃[1] 李庆鹏[2] 赵朴凡 李松[1] WU Yu;WANG Heng;HAN Qi-Jin;LONG Xiao-Xiang;MA Yue;LI Qing-Peng;ZHAO Pu-Fan;LI Song(School of Electronic Information,Wuhan University,Wuhan 430072,China;China Center for Resources Satellite Data and Application,Beijing 100094,China)

机构地区：[1]武汉大学电子信息学院,湖北武汉430072 [2]中国资源卫星应用中心,北京100094

出　　处：《红外与毫米波学报》2022年第6期1051-1061,共11页Journal of Infrared and Millimeter Waves

基　　金：对地高分国家科技重大专项(11-Y20A12-9001-17/18,42-Y20A11-9001-17/18)。

摘　　要：提出了一种基于波形匹配的激光脚点定位方法,该方法以机载激光雷达点云数据作为参考,通过对观测弧段内激光脚点的单点波形匹配和系列脚点相关系数联合处理的方式,精确计算激光指向和距离信息,实现了对高分七号卫星激光脚点在起伏山区的精确定位。使用美国犹他州山地区域的机载激光雷达点云作为当地实测现场数据,对基于论文方法高分七号星载激光测高仪的精确定位数据进行了实验验证。在平均坡度达到20°的犹他州实验区域,观测弧段内高分七号激光脚点高程精度从精确定位前的(2.45±2.93)m提升至(0.27±0.61)m。试验结果表明,该方法可以有效提升高分七号星载激光测高仪观测成果在起伏山区的精度。This paper proposed a geolocation method for laser footprints based on the waveform matching.Specifically,for a single laser footprint,the simulated waveform based on airborne lidar point cloud data as prior measurements was matched with the captured waveform of the Gaofen-7 SLA.Within a laser track,the correlation coefficient of the matching results in successive footprints was calculated to further estimate the laser pointing and ranging information and re-geolocate the laser footprints in mountainous areas.A study area(the Utah State in USA)with local airborne lidar data was selected to verify the proposed method.With the mean surface slope of approximately 20°,the elevation accuracy of GaoFen-7’s laser footprints were improved from(2.45±2.93)m to(0.27±0.61)m,which proved the effectiveness of the proposed method.

关 键 词：高分七号卫星 激光测高仪 激光指向 波形匹配 相关系数联合处理 

分 类 号：TP733[自动化与计算机技术—检测技术与自动化装置]