根据极化线栅的准光学的极化分离原理,设计了由极化线栅、人造黑体和冷空构成的新型线栅定标源.定标源通过极化线栅的旋转混合人造黑体和冷空的辐射能量,从而输出亮温变化可控的微波辐射,为微波辐射计外定标提供人造变温源,解决了低频段大口径天线辐射计的外定标难题.通过定标实验验证,极化线栅在L波段的透过率优于99.3%,反射率达到98.4%,线栅定标源的亮温呈正弦规律变化,变化范围为8~248K,实验结果与设计目标相吻合.
Abstract
The quasi optical polarization separation principle is introduced. The new type of wire grid calibration source consisting of polarized wire grid, artificial black body, and cold sky signal is designed. Through the rotation of the polarized wire grid, the radiation energy of artificial black body and cold sky is mixed. The wire grid calibration source provides varying temperature signals, and solves the problem of low-frequency radiometer calibration. A measured reflectivity of 98.4% and transmittance of 99.9% at L-band is demonstrated. The brightness temperature dynamic range of wire grid calibration source is between 8K and 248K, which meets the design goal.
关键词
辐射计 /
定标 /
极化线栅 /
准光技术
{{custom_keyword}} /
Key words
radiometer /
calibration /
polarized wire grid /
quasi-optical technology
{{custom_keyword}} /
中图分类号:
TP732.1
TN015
{{custom_clc.code}}
({{custom_clc.text}})
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] 李靖,张俊荣,邹彤.数字增益补偿及实时定标微波辐射计[J].电子学报,1999,27(3):49-51. LI Jing,ZHANG Jun-rong,ZOU Tong.Computer Gain Compensative and Continuously Calibrated Microwave Radiometers[J].Acta Electronica Sinica,1999,27(3):49-51.(in Chinese)
[2] 何杰颖.微波毫米波大气温湿度探测定标与反演的理论和方法研究[D].北京:中国科学院空间科学与应用研究中心,2012.1-3.
[3] 陆浩,王振占,刘憬怡,等.全极化微波辐射计系统中高速数字相关器设计[J].电子学报,2011,39(12):2831-2835. LU Hao,WANG Zhen-zhan,LIU Jing-yi,et al.Design of High-Speed Digital Correlator in Fully Polarimetric Microwave Radiometer[J].Acta Electronica Sinica,2011,39(12):2831-2835.(in Chinese)
[4] 赵瑾.固定波束指向星载微波辐射及定标方法研究[D].北京:中国科学院空间科学与应用研究中心,2010.
[5] Sebastian D,Ernst W,Hermann M,et al.A W-band monolithic integrated active hot and cold noise source[J].IEEE Transactions on Microwave Theory and Techniques,2014,62(3):623-630.
[6] 卢红丽,王振占,殷晓斌.利用SMOS卫星数据反演海洋盐度方法研究[J].遥感技术与应用,2014,29(3):401-409.
[7] 程岳云.毫米波天馈系统的准光学分析和近场测量方法研究[D].中国科学院空间科学与应用研究中心,2010.6-9.
[8] Larsen T.A survey of the theory of wire grids[J].IRE Transactions on Microwave Theory and Techniques,1962,10(3):191-201.
[9] Goldsmith P F.Quasi-Optical Systems:Gaussian Beam Quasi-Optical Propagation and Applications[M].New York:Wiley-IEEE Press,1998.192-193.
[10] Chambers W G,Costley A E,Parker T J.Characteristic curves for the spectroscopic performance of free-standing wire grids at millimeter and sub-millimeter wavelengths[J].International Journal of Infrared and Millimeter Waves,1988,9(2):157-172.
[11] 李彬,王振占,张升伟,等.一种大口径微波/毫米波极化线栅研制的新方法[J].电波科学学报,2015,30(3):565-570. LI Bin,WANG Zhen-zhan,ZHANG Sheng-wei,et al.A new method to fabricate large aperture free-standing polarized wire grids at microwave/millimeter wavelengths[J].Chinese Journal of Radio Science,2015,30(3):565-570.(in Chinese)
[12] 王新彪,李靖,张升伟.毫米波/亚毫米波临边探测仪准光技术[J].太赫兹科学与电子信息学报,2013,(4):595-600.
[13] Lahtinen J,M Hallikainen.HUT fully polarimetfic calibration standard for microwave radiometry[J].IEEE Transactions on Geoscience and Remote Sensing,2003,41(3):603-611.
[14] Lahtinen J,Gasiewski A J,Klein M,Corbella I.A calibration method for fully polarimetric microwave radiometers[J].IEEE Transactions on Geoscience and Remote Sensing,2003,41(3):588-602.
[15] Jinzheng Peng,Christopher S R.Calibration method for fully polarimetric microwave radiometers using the correlated noise calibration standard[J].IEEE Transactions on Geoscience and Remote Sensing,2008,46(10):3087-3097.
[16] 王新彪.Ka波段模拟型全极化微波辐射计研究[D].北京:中国科学院空间科学与应用研究中心,2011.1-4.
[17] Ernst W,Axel T,Michael S,et al.Active load modules for W-band radiometer calibration[A].IEEE International Geoscience and Remote Sensing Symposium (IGARSS)[C].Munich,2012.2945-2948.
[18] Ernst W,Arnulf L,Michael S,et al.Highly integrated switching calibration front-end MMIC with active loads for W-band radiometers[A].Proceedings of the 7th European Microwave Integrated Circuits Conference[C].Amsterdam,NL:IEEE Press,2012.203-206.
{{custom_fnGroup.title_cn}}
脚注
{{custom_fn.content}}