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
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作者单位:

1.武汉大学 电子信息学院;2.中国资源卫星应用中心

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基金项目:

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


A new positioning research for the footprints of GaoFen-7 spaceborne laser altimeter in mountainous region based on waveform matching method
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Affiliation:

1.School of Electronic Information,Wuhan University;2.China Center for Resources Satellite Data and Application

Fund Project:

National Science and Technology Major Project(11-Y20A12-9001-17/18, 42-Y20A11-9001-17/18)

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    摘要:

    高分七号搭载了我国首台全波形记录的对地观测星载激光测高仪,激光脚点平面和高程精度是星载激光测高仪最重要的技术指标。本文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和高分七号星载激光测高仪数据进行了实验验证,在平均坡度达到20°的实验区域,使用本文提出的方法后,观测弧段内脚点高程精度从2.45±2.93m提升至0.27±0.61m,提升了高分七号星载激光测高仪观测成果在起伏山区的适用性。

    Abstract:

    The SLA (spaceborne laser altimeter) borne on Gaofen-7 satellite is the first SLA with full-waveform recording for Earth observation. The horizontal and vertical accuracy of laser footprints are the most important technical indicators for a SLA. This paper proposes a method to improve the geolocation accuracy for laser footprints based on waveform simulating and matching. Using airborne lidar point cloud data as in-situ measurements, the laser pointing and ranging information are calculated and further calibrated by matching the simulated waveform with the Gaofen-7 captured waveform of a single footprint and combined treatment of successive footprints correlation coefficient within a laser track. Mountainous study areas (Utah states in USA) were selected. After using the proposed method, the residual of laser footprint elevations in Utah and Wyoming states was improved from 2.54m to 0.27±0.61m with the mean surface slope of approximately 20°, respectively. The results indicate that the proposed method can improve the data accuracy of Gaofen-7 SLA in mountainous areas with the help of in-situ DEM (digital elevation model) data.

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  • 收稿日期:2022-05-11
  • 最后修改日期:2022-06-06
  • 录用日期:2022-06-07
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