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电离层对星载合成孔径雷达方位向分辨率影响的分析 被引量：2

Study about Ionospheric Effects on Spaceborne SAR Azimuth Imaging
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摘要 该文分析了天线实孔径尺寸、不同电离层谱以及电离层不规则体尺度等因素在电离层对星载合成孔径雷达(SAR)方位向分辨率影响中的作用。研究结果表明,保持星载SAR合成孔径长度不变,增加天线实孔径的尺寸会引起SAR方位向分辨率的退化,同时导致SAR方位向图像平滑。电离层的Kolmogorov谱对SAR方位向的影响较双参谱严重。电离层不规则体尺度远大于合成孔径的尺寸时,电离层对SAR方位向分辨率的影响可以忽略;在电离层不规则体的尺度减小到合成孔径的尺寸以下,但量级接近时,电离层的影响会导致SAR方位向分辨率的恶化。 In this paper, the effect of some factors such as the size of real antenna, different ionospheric spectra and the size of ionospheric irregularities on the azimuth resolution of Synthetic Aperture Radar（SAR） is investigated. The results showed that increasing real antenna aperture size but maintaining the equivalent aperture size of the SAR system will decrease the SAR image＇s azimuth resolution, however, it can smooth azimuth image; Ionosphere with Kolmogorov spectrum affects the SAR azimuth imaging more seriously than that with two-parameter spectrum; When the irregularity scale is much larger than equivalent aperture size, the impact of the ionosphere on the SAR azimuth resolution can be ignored; However, when irregularity scale is smaller than equivalent aperture size but with close magnitude, the impact of the ionosphere will result in a substantial degradation of the azimuth resolution.
作者 郑虎 李廉林 李芳
机构地区 中国科学院电子学研究所
出处 《电子与信息学报》 EI CSCD 北大核心 2008年第9期2085-2088,共4页 Journal of Electronics & Information Technology
关键词 星载SAR 天线实孔径尺寸 电离层不规则体 电离层湍动谱 广义模糊函数 Spaceborne SAR Size of antenna real aperture Ionospheric irregularities Ionospheric turbulence spectrum Generalized ambiguity function
分类号 TN959.74 [电子电信—信号与信息处理]
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参考文献8

  • 1Saatchi S and Moghaddam M. Estimation of boreal forest biomass using spaceborne SAR systems. Proc. IGARSS, Piseataway, NJ,USA, July 1999, 3: 1646-1648.
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同被引文献28

  • 1甄卫民,冯健,陈丽,韩一平.多站多路径GPS信号研究低纬电离层不均匀体[J].电波科学学报,2007,22(1):138-142. 被引量：19
  • 2Sophie R,et al..Spaceborne P-band SAR for BIOMASSmission[C].IEEE International Geoscience and RemoteSensing Symposium,Hawaii,USA,July 25-30,2010:2880-2883.
  • 3Tsynkov S V.On SAR imaging through the earth’sionosphere[J].SIAM J.Imaging Sciences,2009,2(1):140-182.
  • 4Xia Dong-kun,et al..An approach for ionospheric effectsreducing on SAR imaging[C].Proceedings of 2ndAsian-Pacific Conference on Synthetic Aperture Radar,Xi’an,China,Oct.26-30,2009:1072-1075.
  • 5Ramon B,et al..Estimation and compensation of ionosphericdelay for SAR interferometry[C].IEEE InternationalGeoscience and Remote Sensing Symposium,Hawaii,USA,July 25-30,2010:2908-2911.
  • 6Liu J,Kuga Y,et al..Ionospheric effects on SAR imaging:anumerical study[J].IEEE Transactions on Geoscience andRemote Sensing,2003,41(5):939-947.
  • 7Preethi M B.Estimation and correction of tropospheric andionospheric effects on differential SAR interferograms[D].[Ph.D.dissertation],University of Twente,2011.
  • 8Franz M.Performance requirements for correction ofionospheric signals in L-band SAR data[C].EuropeanConference on Synthetic Aperture Radar,Aachen,Germany,June 7-10,2010:1106-1109.
  • 9Philip R A,et al..Simulating and mitigating ionosphericeffects in synthetic aperture radar[C].IEEE InternationalGeoscience and Remote Sensing Symposium,Hawaii,USA,July 25-30,2010:2892-2895.
  • 10Xu Zheng-wen,Wu Jian,et al..A survey of ionosphericeffects on space-based radar[J].Waves in Random Media,2004,14(2):S189-S273.

引证文献2

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电子与信息学报
2008年 第9期

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