星载线阵遥感器在轨几何外检校技术研究

发布时间：2018-07-03 14:06

本文选题：外检校 + 常差检校　；参考：《航天返回与遥感》2016年05期

【摘要】：文章叙述了星载线阵遥感器的严格成像几何模型,分析了姿态角误差随时间的变化情况,发现俯仰角误差和滚动角误差随时间变化的线性规律。在此基础上,提出一种基于姿态角常差检校模型同时顾及姿态角误差随时间变化的线性量的在轨几何外检校方法,检校参数不仅由三个角元素误差组成,同时包含俯仰角误差和滚动角误差随时间变化的线性量,并给出了相应参数求解方法。利用高精度控制数据和高分辨率卫星影像验证了文章的模型和算法。试验结果表明,改进后的外检校试验结果优于常差检校模型,尤其是在线阵方向上的定位精度从17.9个像素提高到1.0个像素,这说明了俯仰角误差随时间变化的线性量影响很大;在沿轨方向的定位精度从5.3个像素提高到3.7个像素,说明滚动角上的随时间变化的线性量客观存在,但是相对于俯仰角误差随时间变化的线性量影响不大。采用文章提出的在轨几何外检校方法,影像定位精度显著提升。
[Abstract]:In this paper, the strict imaging geometric model of spaceborne linear array remote sensor is described. The variation of attitude angle error with time is analyzed, and the linear law of pitch angle error and rolling angle error with time is found. On this basis, a calibration method based on attitude constant error calibration model is proposed, which takes into account the linear variable of attitude angle error with time. The calibration parameters are not only composed of three angular element errors. It also includes the linear variables of pitch angle error and rolling angle error with time, and gives the corresponding parameter solving method. The model and algorithm of this paper are verified by high precision control data and high resolution satellite image. The experimental results show that the improved external calibration test results are superior to the constant difference calibration model, especially the positioning accuracy in the on-line array direction is improved from 17.9 pixels to 1.0 pixels, which indicates that the pitch angle error has a great influence on the linear variation of the pitch angle error with time. The accuracy of positioning along the orbit direction is raised from 5.3 pixels to 3.7 pixels, which indicates that the linear quantity of the rolling angle varies with time objectively, but the linear quantity relative to the elevation angle error changes with time has little effect. The accuracy of image location is improved significantly by using the external calibration method of orbit geometry proposed in this paper.
【作者单位】：北京空间机电研究所;
【分类号】：P237

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