| 像素相位误差的特性 |
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| 引用本文： | 曹西平,彭青玉,张庆丰.像素相位误差的特性[J].天文研究与技术,2011,8(2):159-166. |
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| 作者姓名： | 曹西平 彭青玉 张庆丰 |
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| 作者单位： | 暨南大学,计算机科学系,广东,广州,510632;暨南大学,中法天体测量、动力学与空间科学联合实验室,广东,广州,510632;广东省高等学校光电信息与传感技术重点实验室,暨南大学,广东,广州,510632 |
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| 基金项目： | 国家自然科学基金，中央高校基本科研业务费专项基金 |
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| 摘 要： | 对欠采样图像做天体测量时,往往受像素相位误差的影响.利用高斯函数作为点扩散函数模型进行仿真实验表明,像素相位误差有类似正弦函数的分布,其幅度与拟合模型的半高全宽相对于星像真实的半高全宽的差别有关,拟合模型的半高全宽与星像真实的半高全宽偏差越大,像素相位误差越大.此外还对高斯与ePSF两个函数模型拟合星像位置的精度情况进...
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| 关 键 词： | 像素相位 欠采样 天体测量 图像分析 |
Characteristics of Pixel-Phase Errors |
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| Cao Xiping,Peng Qingyu,Zhang Qingfeng.Characteristics of Pixel-Phase Errors[J].Astronomical Research & Technology,2011,8(2):159-166. |
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| Authors: | Cao Xiping Peng Qingyu Zhang Qingfeng |
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| Institution: | Cao Xiping1,2,3,Peng Qingyu1,Zhang Qingfeng1,3(1.Department of Computer Science,Jinan University,Guangzhou 510632,China,2.Sino-France Joint Laboratory for Astrometry,Dynamics and Space Science,3.Key Laboratory of Optoelectronic Information and Sensor Technologies of Guangdong Higher Educational Institutes,China) |
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| Abstract: | Astrometry from undersampled images is usually affected by pixel-phase errors.Using simulated images with Ganssion functions as point spread functions,we carry out a study of characteristics of pixel-phase errors.Our experimental results show that the statistical variation of pixel-phase error with pixel phase is near a sine function and the amplitude of this variation depends on the deviation of the fitting-model FWHM from true stellar FWHM.Overall the errors decrease with such deviations.In addition,we st... |
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| Keywords: | Pixel phase Undersampling Astrometry Image analysis |
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