资源三号02星激光测高仪在轨几何检校与试验验证

发布时间：2018-06-13 13:54

本文选题：资源三号星 + 激光测高仪　；参考：《测绘学报》2017年06期

【摘要】：我国在资源三号02星上首次搭载了一台用于对地观测的试验性载荷——激光测高仪,开展对地观测的激光测高试验。由于卫星发射时的振动以及入轨后空间环境变化等因素影响,激光测高仪的指向、测距等系统参数相对于发射前地面测量值可能发生变化,从而引起激光的平面和高程误差。本文根据资源三号02星激光测高仪特点,提出了一种基于地面探测器的在轨几何检校方法,该方法构建了以指向、测距为系统误差的严密几何检校模型,以激光测距值残差最小为原则,利用地面探测器捕获的激光光斑位置作为参考,实现系统误差参数高精度在轨几何检校。利用卫星在轨测试期间多个试验场数据进行检校后,以有关DEM数据作为地面参考比对,地形坡度小于2°区域内的激光点高程精度由检校前的100~140m提高到2~3m。利用平坦地区激光足印内少量GPS外业控制点进行验证对比,检校后激光高程测量的绝对精度优于1m。试验结果表明了资源三号02星激光测高仪在轨几何检校方法的有效性和正确性。
[Abstract]:For the first time, a laser altimeter, an experimental load for earth observation, was carried out on Resource-3 02 in China to carry out laser altimetry for earth observation. Due to the influence of the vibration during satellite launch and the change of space environment after orbit, the system parameters such as pointing and ranging of laser altimeters may change relative to the ground measurements before launching, thus causing the plane and elevation errors of the laser. According to the characteristics of Resource-3 02 satellite laser altimeter, a method of in-orbit geometric calibration based on ground detector is proposed in this paper. A strict geometric calibration model with pointing and ranging as systematic error is constructed. Based on the principle of minimum residual value of laser ranging, the laser spot position captured by ground detector is used as a reference to achieve high precision calibration of system error parameters in orbit geometry. The accuracy of laser elevation in the region of less than 2 掳is improved from 100 ~ 140 m to 2 ~ 3 m by using the data of several test sites during satellite orbit testing and using the Dem data as the ground reference. By using a small number of GPS field control points in the flat area laser footprint, the absolute accuracy of laser height measurement is better than 1 m after checking. The experimental results show the validity and correctness of the calibration method for the laser altimeter of Resource3 02.
【作者单位】：国家测绘地理信息局卫星测绘应用中心;辽宁工程技术大学测绘与地理科学学院;武汉大学测绘遥感信息工程国家重点实验室;
【基金】：国家高分专项高分遥感测绘应用示范系统项目(AH1601-9) 国家测绘地理信息局2016年基础测绘科技项目(2016KJ0204) 国家青年科学基金(41301525) 国家自然基金面上项目(41571440) 国家测绘地理信息局青年学术带头人基金(D1501)~~
【分类号】：P237

【相似文献】