| 降雨粒子电磁特性分析及雨区目标成像 |
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| 引用本文： | 陈嘉琪,陈如山,彭华,沈鹏,丁大志.降雨粒子电磁特性分析及雨区目标成像[J].电波科学学报,2011(5):888-893,1024,1025. |
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| 作者姓名： | 陈嘉琪 陈如山 彭华 沈鹏 丁大志 |
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| 作者单位： | 南京理工大学通信工程系;空间微波技术国防科技重点实验室 |
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| 基金项目： | 重点实验室基金资助(项目编号:9140C5306010903) |
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| 摘 要： | 从理论仿真的角度,描述了传输矩阵方法的基本原理,并以Ku、Ka波段为例,对降雨粒子模型的双波段散射衰减特性进行了仿真比较。从宏观角度对不同雨强、不同频率下的雨衰进行了定量分析。提出了一种针对雨区三维复杂目标进行成像仿真的技术,仿真结果表明:在Ku波段下,当雨强超过10mm/h(中雨)时,雨衰对SAR图像的影响就必须被考虑;当雨强达到50mm/h(大雨)时,SAR图像将出现十分严重的图像质量恶化。在Ka波段下,即便小雨的影响都可在SAR图像中显现;而中等以上降雨将导致SAR图像几乎或完全湮没。
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| 关 键 词： | 降雨粒子 电磁散射 降雨衰减 SAR成像 |
Analysis of electromagnetic properties of precipitation particle and imaging simulation of target in rainfall environment |
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| CHEN Jia-qi,CHEN Ru-shan,PENG Hua,SHEN Peng,DING Da-zhi.Analysis of electromagnetic properties of precipitation particle and imaging simulation of target in rainfall environment[J].Chinese Journal of Radio Science,2011(5):888-893,1024,1025. |
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| Authors: | CHEN Jia-qi CHEN Ru-shan PENG Hua SHEN Peng DING Da-zhi |
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| Affiliation: | 1 (1.Department ofCommunication Engineering,Nanjing University of/ Science and Technology,Naning Jiangsu 210094,China; 2.National Key Laboratory of Science and Technology on Space Microwave Technology,Xi’an Shaanxi 710000,China) |
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| Abstract: | Firstly,electromagnetic scattering model of precipitation particle is analyzed.In order to research the scattering from raindrop particle in the Ku-band and Ka-band,the fast and accurate transfer matrix method(T-matrix) is used to analyze simple spherical or ellipsoid targets.Secondly,the influence of rainfall attenuation in multi-band and different rain rate is investigated.Finally,an imaging simulation method of 3-D complex target in rainfall environment is proposed. Simulation results demonstrate the influence of precipitation attenuation must be considered in Ku-band,while the rainfall intensity is above 10 mm/h.And SAR images in Ku-band will appear a much more severe degradation,when the rain rate increases to 50 mm/h.In Ka band,it is obvious that even impact of light rain could be seen in the images.And medium or heavy intensity precipitation will make SAR images nearly or completely blurred. |
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| Keywords: | precipitation particles EM scattering rain attenuation SAR |
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