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電離層閃爍對星載P波段SAR的影響分析

馮健 甄衛(wèi)民 吳振森 劉鈍

馮健, 甄衛(wèi)民, 吳振森, 劉鈍. 電離層閃爍對星載P波段SAR的影響分析[J]. 電子與信息學報, 2015, 37(6): 1443-1449. doi: 10.11999/JEIT140948
引用本文: 馮健, 甄衛(wèi)民, 吳振森, 劉鈍. 電離層閃爍對星載P波段SAR的影響分析[J]. 電子與信息學報, 2015, 37(6): 1443-1449. doi: 10.11999/JEIT140948
Feng Jian, Zhen Wei-min, Wu Zhen-sen, Liu Dun. Effects of Ionospheric Scintillation on P Band Spaceborne SAR[J]. Journal of Electronics & Information Technology, 2015, 37(6): 1443-1449. doi: 10.11999/JEIT140948
Citation: Feng Jian, Zhen Wei-min, Wu Zhen-sen, Liu Dun. Effects of Ionospheric Scintillation on P Band Spaceborne SAR[J]. Journal of Electronics & Information Technology, 2015, 37(6): 1443-1449. doi: 10.11999/JEIT140948

電離層閃爍對星載P波段SAR的影響分析

doi: 10.11999/JEIT140948
基金項目: 

國家國際科技合作專項(2011DFA22270)資助課題

Effects of Ionospheric Scintillation on P Band Spaceborne SAR

  • 摘要: 電離層閃爍會破壞星載合成孔徑雷達(SAR)回波信號之間的相關性,使其成像性能下降。已有的工作都是假設已知電離層電子密度的擾動開展的,但是目前的測量手段無法直接獲取該參量。該文利用??谟^測站超高頻(UHF)頻段太陽活動高年和中等年份的實測數據,分析電離層閃爍的變化特征,并基于相位屏理論,給出一種利用閃爍指數評估電離層閃爍對星載P波段SAR系統(tǒng)影響效應的方法。結果表明:電離層閃爍在低緯地區(qū)主要發(fā)生在夜間,且在兩分季高發(fā);太陽活動高年,全年約有3.8%的時間會發(fā)生電離層閃爍現(xiàn)象;對于P波段SAR系統(tǒng)來說,弱閃爍使得方位向沖激響應函數(IRF)的主瓣寬度和副瓣增益增大,分辨率下降;中等強度閃爍使得方位向沖激響應函數發(fā)生嚴重的擾動,副瓣增益增大到主瓣的水平,主瓣中心也發(fā)生平移,可能使得系統(tǒng)無法直接成像。
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  • 文章訪問數:  1881
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  • 被引次數: 0
出版歷程
  • 收稿日期:  2014-07-17
  • 修回日期:  2014-11-05
  • 刊出日期:  2015-06-19

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