天宫二号卫星宽波段成像光谱仪地理定位方法  

Geometric Location Method for Tiangong No.2Satellite Wide-band Imaging Spectrometer

作　　者：杨涛[1] 何玉青[1] 胡秀清[2] YANG Tao;HE Yuqing;HU Xiuqing(School of Optoelectronics,Beijing Institute of Technology,Beijing 100081,China;National Satellite Meteorological Centre,Beijing 100081,China)

机构地区：[1]北京理工大学光电学院,北京100081 [2]国家卫星气象中心,北京100081

出　　处：《遥感信息》2019年第3期7-13,共7页Remote Sensing Information

基　　金：国家自然科学基金(41871249、41471302);国家重点研发计划(2018YFB0504900、2018YFB0504901、2018YFB0504802)

摘　　要：本文针对天宫二号(Tiangong No.2,TG-2)宽波段成像光谱仪的宽波段相机进行观测几何和地理定位解算。TG-2搭载的宽波段成像光谱仪是用于海洋、气象和环境空间综合观测的新一代试验遥感仪器。解算该仪器观测几何和高质量遥感地理定位数据是开展上述应用的前提和基础。本文基于宽波段相机多CCD拼接直视推扫模式.根据其特殊的扫描几何和卫星空间位置姿态.建立仪器焦平面与地理空间位置的对应模型。通过大量实际观测的定位数据建立旋转角度与变形数量的关系.修正安装矩阵,提高了模型定位精度。利用该模型实现了对TG-2卫星宽波段成像光谱仪图像的地理定位。利用图像的地理位置进行投影.与高精度海陆模板进行比较,定位精度约为2个像元(200m)。The wide-band imaging spectrometer installed on Tiangong No.2(TG-2)is a new generation of integrated remote sensing instrument for observing the ocean,weather and environment.It is the prerequisite and basis for the above-mentioned application to obtain the high-quality geolocation.In this paper,the geolocation algorithm is developed for the geolocation of the wide-band camera of TG-2 wide-band imaging spectrometer.The wide-band camera is the multi-CCD push broom scanners.According to its special scanning geometry and the spatial posture of the satellite,the corresponding model between the focal plane and the geospatial position of the instrument is established.The geolocation location of TG-2 satellite wide-band imaging spectrometer is realized by using this model.In order to improve the positioning accuracy,we establish the relationship between the rotation angle and the number of deformation by large number of positioning data and modify the installation matrix moment.We compare the results with high-precision land and sea templates.The results show that the geographic accuracy is high.The positioning accuracy is better than 2 pixels(200 m).

关 键 词：天宫二号 宽波段成像光谱仪 地理定位 安装矩阵 多CCD拼接推扫 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]