| 离焦对光学相关法测量空间相机像移精度的影响 |
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| 引用本文： | 樊超,李英才,傅洪亮,杨铁军.离焦对光学相关法测量空间相机像移精度的影响[J].光学学报,2011(10). |
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| 作者姓名： | 樊超 李英才 傅洪亮 杨铁军 |
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| 作者单位： | 河南工业大学信息科学与工程学院;中国科学院西安光学精密机械研究所; |
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| 基金项目： | 国家973计划(2009CB724006)资助课题 |
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| 摘 要： | 为了研究使用联合变换相关器(JTC)测量空间相机的亚像元像移时CCD离焦对像移测量精度的影响,基于菲涅耳衍射理论,推导了离焦引起的二次相位因子。分别通过计算机仿真和实验,研究了对JTC使用功率谱相减并以0值为门限二值化的处理方法时,离焦对像移测量精度的影响程度。结果表明,当离焦量小于透镜焦距的5%时,由此引起的像移测量误差不大于10%,具有较好的稳健性;继续增加离焦量,则像移测量误差会呈非线性显著增加。研究结果为解决空间相机像移的在轨准确测量问题提供了有益的探索和参考。
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| 关 键 词： | 遥感 像移 联合变换相关器 离焦 |
Influence of Defocusing on Measurement Accuracy of Image Motion of Space Camera |
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| Fan Chao Li Yingcai Fu Hongliang Yang Tiejun.Influence of Defocusing on Measurement Accuracy of Image Motion of Space Camera[J].Acta Optica Sinica,2011(10). |
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| Authors: | Fan Chao Li Yingcai Fu Hongliang Yang Tiejun |
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| Institution: | Fan Chao1 Li Yingcai2 Fu Hongliang1 Yang Tiejun1 |
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| Abstract: | To research the influence of the defocusing of CCD on the measurement accuracy when using the joint transform correlator(JTC) to measure the image motion of space camera,the quadratic phase factor induced by defocusing is deduced based on the theory of Fresnel diffraction.Then the measurement error caused by defocusing is studied by emulation and experiment respectively for the JTC which is processed by using the method of power spectrum subtraction and binarization with threshold of zero.The results show t... |
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| Keywords: | remote sensing image motion joint transform correlator defocusing |
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