资源三号卫星成像在轨几何定标的探元指向角法

从资源三号卫星（ZY-3）影像严格几何模型出发，通过对星敏感器坐标系下各CCD探元指向角的分析，提出一种ZY-3成像在轨几何定标的探元指向角法。经对嵩山和洛阳两个试验区

The LookGangle Calibration Method for OnGorbit Geometric Calibration of ZYG3 Satellite Imaging Sensors

Starting from a rigorous geometric model of ZY-3 satellite images, a look-angle calibration method for on-orbit geometric calibration of ZY-3 satellite imaging sensors was proposed by analyzing CCD look angles in a star sensor coordinate system. Two sets of ZY-3 satellite images covering Songshan area and Luoyang area were used, respectively. The empirical results have shown that the proposed method is simple and practicable and the calibration parameters have no correlation. The object positioning accuracy of nadir images is better than ±2.7 m and the planimetric and height accuracies of forward-backward stereo pairs are better than ±4.8 m and ±3.2 m respectively, after calibrating satellite sensor according to the proposed method without laboratory calibration parameters and with only five ground control points. Additionally, using CCD look angles obtained by the proposed method for extrapolative object positioning of ZY-3 satellite images, the object positioning accuracy of nadir images is better than ±11 m and the planimetric and height accuracies of object positioning of forward-backward stereo pairs are better than ±19 m and ±4 m respectively.