敏捷卫星同轨多条带成像拼接重叠像元数阈值分析
发布时间：2019-01-13 09:26
【摘要】：针对敏捷成像中的多条带拼接成像模型,对条带图像的拼接重叠度进行仿真分析。建立多条带拼接成像的任务模型和几何退化模型,提出重叠区域宽度阈值的判别准则。针对星下点条带,分析不同场景类型遥感图像的重叠区域宽度阈值,探究了地面分辨率变化对重叠区域宽度阈值的影响。针对敏捷条带,分析了俯仰、横滚等敏捷特性对于重叠阈值的影响。仿真结果表明,在0.46 m地面分辨率下,6类场景类型重叠宽度阈值均在28 pixels以上,其中军港机场、海岛阈值较大,超过31 pixels。阈值统计符合正态分布的3σ原则,证明了阈值求解方式的可信度。星下点成像时地面分辨率变化对像面重叠像素阈值无太大影响,但对地面实际重叠宽度阈值影响较大。而敏捷条带成像时,卫星的俯仰和横滚将会增大条带的重叠宽度阈值,几何变形对阈值的影响超过星下点时地面分辨率的变化。通过对条带拼接重叠度的仿真分析,为敏捷卫星的高分辨率光学成像任务规划提供了有意义的参考。
[Abstract]:Aiming at the multi-band splicing imaging model in agile imaging, the overlap degree of strip image is simulated and analyzed. The task model and geometric degradation model of multi-band splicing imaging are established, and the criterion of threshold value of overlapping region width is proposed. In this paper, the overlap region width threshold of remote sensing images of different scene types is analyzed, and the influence of ground resolution on overlapping region width threshold is discussed. The effects of pitch and roll on overlap threshold are analyzed. The simulation results show that at the ground resolution of 0. 46m, the threshold of overlap width of 6 kinds of scene types is above 28 pixels. The threshold of military port and airport and island is larger than 31 pixels.. The threshold statistics accord with the 3 蟽 principle of normal distribution, and the reliability of the threshold solution is proved. The change of ground resolution does not have much effect on the threshold of overlapping pixels in image plane, but it has a great effect on the threshold of actual overlap width of the ground. In agile strip imaging, the pitch and roll of the satellite will increase the overlap width threshold of the strip, and the effect of geometric deformation on the threshold will exceed the change of the ground resolution at the sub-star point. The simulation analysis of the overlap degree of strip splicing provides a meaningful reference for the high resolution optical imaging task planning of agile satellite.
【作者单位】： 浙江大学现代光学仪器国家重点实验室;
【基金】：浙江省科技计划项目(2017C01033)资助
【分类号】：TP751;V474.2
本文编号：2408314
[Abstract]:Aiming at the multi-band splicing imaging model in agile imaging, the overlap degree of strip image is simulated and analyzed. The task model and geometric degradation model of multi-band splicing imaging are established, and the criterion of threshold value of overlapping region width is proposed. In this paper, the overlap region width threshold of remote sensing images of different scene types is analyzed, and the influence of ground resolution on overlapping region width threshold is discussed. The effects of pitch and roll on overlap threshold are analyzed. The simulation results show that at the ground resolution of 0. 46m, the threshold of overlap width of 6 kinds of scene types is above 28 pixels. The threshold of military port and airport and island is larger than 31 pixels.. The threshold statistics accord with the 3 蟽 principle of normal distribution, and the reliability of the threshold solution is proved. The change of ground resolution does not have much effect on the threshold of overlapping pixels in image plane, but it has a great effect on the threshold of actual overlap width of the ground. In agile strip imaging, the pitch and roll of the satellite will increase the overlap width threshold of the strip, and the effect of geometric deformation on the threshold will exceed the change of the ground resolution at the sub-star point. The simulation analysis of the overlap degree of strip splicing provides a meaningful reference for the high resolution optical imaging task planning of agile satellite.
【作者单位】： 浙江大学现代光学仪器国家重点实验室;
【基金】：浙江省科技计划项目(2017C01033)资助
【分类号】：TP751;V474.2
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