多普勒差分干涉仪干涉图畸变对相位反演精度影响分析
Analysis of Influence of Doppler Asymmetric Spatial Heterodyne Interferogram Distortion on Phase Inversion Accuracy
查看参考文献17篇
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文摘
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为了解决多普勒差分干涉仪风场探测技术中,干涉图畸变对风速反演带来的系统误差,通过对大气气辉氧原子红线和绿线的正演干涉图添加不同类型、大小的干涉图畸变,仿真对比了含畸变干涉图与理想干涉图反演多普勒相位的差异,得到干涉图畸变对多普勒相位反演精度的影响。结果表明多普勒相位误差随着目标风场与干涉图畸变程度增大而增大,其中条纹局部弯曲影响最大,且弯曲范围越小越靠近采样中心误差越大。通过局部弯曲对不同条纹频率系统产生的误差仿真表明,等量的弯曲对条纹频率高的系统产生更大影响。此外含畸变干涉图多行像元合并时局部调制度降低,不会增加相位不确定度,因此即使干涉图存在缺陷也可以进行多行像元合并,提高信噪比,降低相位不确定度。研究结果为多普勒差分干涉仪的设计、加工、装调指标提供了定量理论依据。 |
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其他语种文摘
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The wind information of the middle and upper atmosphere is very important to study the coupling of the upper and lower atmosphere and energy,to ensure the smooth development of spacecraft space activities,and to carry out medium and long-term meteorological predictions.The doppler asymmetric spatial heterodyne wind measurement technology is a technique based on the Fourier transform of the interferogram to realize the detection of the doppler frequency shift of the wind.Doppler asymmetric spatial heterodyne is a new passive wind detection technology.For the interferometer,the processing and assembly errors of optical components and structural components,and the aberration of the optical system will distort the interference image.Introducing inversion error in the process of wind speed measurement.The current research on DASH interferogram distortion has not analyzed the influence of interferogram distortion on the accuracy of Doppler phase inversion and lacks the quantitative theoretical basis for the design,processing,and adjustment of Doppler asymmetric spatial heterodyne.In this paper,we analyzed the sources of different distortion in Doppler asymmetric spatial heterodyne.Then by adding different types and sizes of interferogram distortions to the interferograms of the red and green oxygen emission line,the simulation compares the difference between the distorted interferogram's and the ideal interferogram's Doppler phase.By adding optical distortion,local bending,slanted fringes and frequency changed these four different forms of interferogram distortion,we got the influence of distortion on the accuracy of Doppler phase inversion.The results show that the Doppler phase error will increase with the increase of the target wind field and interferogram distortion.The Doppler phase error of optical distortion is also will increase with the increase of the target wind field but will fluctuate increase with the increase of interferogram distortion.Among these four different forms of interferogram distortion,the local bending of fringes has the greatest influence on Doppler phase inversion.The phase error increases by 0.113‰ for each additional pixel of the local bending.But the maximum phase error is only 0.03‰ under the condition of 2% distortion.To further explore the influence of local bending sizes and location,we simulate various interferograms with local bending of different sizes and locations.The result shows that the Doppler phase error fluctuation decreases and gradually converges when the size increases.And the phase error fluctuates with the change of position.The fluctuation amount in the first half is small,and the fluctuation in the second half increases gradually.The phase error generated by the same bending at the sampling center is larger than that at the sampling edge.Therefore,attention should be paid to the small distortion in the sampling center area,and if necessary,interferogram correction should be performed to reduce the phase error.The simulation of errors caused by local bending on systems with different fringe frequencies shows that the same amount of bending will have a greater impact on systems with high fringe frequencies.In addition,interferogram with a low signal-to-noise ratio usually uses multiple rows of pixels of the interferogram to reduce uncertainty of phase. |
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来源
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光子学报
,2022,51(6):0601001 【核心库】
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DOI
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10.3788/gzxb20225106.0601001
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关键词
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大气风场探测
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多普勒差分干涉仪
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干涉图畸变
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多普勒相位误差
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多行像元合并
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地址
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1.
中国科学院西安光学精密机械研究所, 中国科学院光谱成像技术重点实验室, 西安, 710119
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中国科学院大学, 北京, 100049
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中国人民解放军63768部队, 西安, 710200
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1004-4213 |
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学科
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机械、仪表工业 |
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基金
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国家自然科学基金
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中国科学院西部青年学者
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陕西省自然科学基金
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中国科学院西部之光交叉团队资助
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文献收藏号
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CSCD:7262489
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