合成孔徑雷達相干目標的分辨力評定
THE ASSESSMENT OF SAR RESOLUTION OF COHERENT TARGETS
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摘要: 通常對合成孔徑雷達圖象分辨力的評定是以雷達系統(tǒng)參數(shù)來考慮的。實際上由于合成孔徑雷達本身成象的特點,其圖象分辨力也是同目標特性密切相關(guān)的。本文通過數(shù)學分析,將相干目標的分布模型與圖象的可分辨條件結(jié)合在一起,提出了與目標特性相關(guān)的雷達圖象分辨力評定標準可分辨概率,并針對不確定目標的特性提出了平均可分辨概率的概念。針對所提出的分辨力評定標準,本文給出了計算示例,從計算結(jié)果中可以看出,目標特性對于雷達圖象的分辨力有很大的影響,在設計或者評定雷達圖象分辨力時應當考慮到目標特性的影響。
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關(guān)鍵詞:
- 合成孔徑雷達; 分辨力評定; 相干目標
Abstract: A method is presented to assess the Synthitic Aperture Radar (SAR) resolution of coherent targets. The SAR resolution is usually considered to be a parameter of SAR system and determined by SAR itself. However, the SAR resolution is also relative to the properties of radar targets. in this paper, the relationship between SAR resolution and coherency of radar targets is analysed in details, and the separable probability is presented as a parameter to assess the SAR resolution. Numerical results are given to illuminate the assessment. -
Ulaby F T, Moore R K, Fang A K. Microwave Remote Sensing Active and Passive, Vo1.2, MA: Addison-Wesley, 1982，Chap. 7.[2]Goodman N R. Ann[J].Math. Statist.1963, 34(1):152-177[3]Papoulis A. Probability, Random Variables, and Stochastic Processes, New York: McGraw-Hill, 1965, Chap. 7. -
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