高轨无缝面阵扫描判断方法:栅格法和几何相交法

发布时间：2018-05-05 06:13

  本文选题：像旋 + 无缝　； 参考：《遥感学报》2017年06期

【摘要】：极轨海洋卫星的时间分辨率低,不能及时感知快速变化的海洋现象及海洋突发事件,因此,发展静止轨道海洋成像辐射计势在必行。静止轨道卫星可以长时间观测指定海域,但是视场小,需要通过二维指向镜等方式扩大卫星的观测区域。本文意在通过提出漏扫判断方法,给出合理的扫描方式,保证高轨面阵扫描无地理信息遗漏。首先,本文在分析二维指向镜成像原理的基础上,给出了指向镜子图像成像特性以及不同方向、大小的电机转角所引入的像面旋转。其次,画出了子图像的边界包络图,直观地给出了扫描角度变化与图像覆盖程度的关系。最后,提出了两种无缝拼接的判断方法:栅格法和几何相交法,栅格法能够判断出图像覆盖次数,几何法速度快、准确度高。实验结果表明应用本文的两种方法得到了不同扫描角度间隔下地球边缘有无漏扫的情况,找到基于本文光学系统、可覆盖全球且无缝拼接图像的最大俯仰、方位转角间隔,为电机转角步距的设置提供理论依据,保证不漏扫的同时提高载荷的时间分辨率。
[Abstract]:The time resolution of polar orbiting marine satellites is low, so it is necessary to develop geostationary orbit ocean imaging radiometers because they can not perceive the rapidly changing ocean phenomena and ocean emergencies in time. Geostationary satellites can observe the designated sea area for a long time, but the field of view is small, so it is necessary to expand the observation area of the satellite by means of two-dimensional pointing mirror and so on. The purpose of this paper is to provide a reasonable scanning method to ensure that there are no geographical information omissions in high orbit array scanning. Firstly, based on the analysis of the imaging principle of the two-dimensional pointing mirror, the imaging characteristics of the pointing mirror image and the image plane rotation induced by the motor rotation angle in different directions are given. Secondly, the boundary envelope diagram of the sub-image is drawn, and the relationship between the scan angle and the image coverage is presented intuitively. Finally, two kinds of judgment methods of seamless stitching are put forward: grid method and geometric intersection method. Grid method can judge image coverage times, geometric method has high speed and accuracy. The experimental results show that the two methods presented in this paper are used to obtain whether there is a leakage scan on the edge of the earth at different scanning angles. The optical system based on this paper can cover the maximum pitch and azimuth angle interval of the global and seamless stitching images. It provides a theoretical basis for the setting of the angle step of the motor and ensures that the time resolution of the load can be improved while not leaking the sweep.
【作者单位】： 中国科学院上海技术物理研究所中国科学院红外探测与成像技术重点实验室;中国科学院大学;
【基金】：全球变化与海汽相互作用专项(编号:GASI-03-03-01-01)~~
【分类号】：P715.6;TP391.41;V474.2
，

本文编号：1846559