| 微波波段大气折射率结构常数的仿真研究 |
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| 引用本文： | 魏浩,胡明宝,艾未华.微波波段大气折射率结构常数的仿真研究[J].气象科学,2016,36(5):667-673. |
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| 作者姓名： | 魏浩 胡明宝 艾未华 |
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| 作者单位： | 解放军理工大学 气象海洋学院, 南京 211101,解放军理工大学 气象海洋学院, 南京 211101,解放军理工大学 气象海洋学院, 南京 211101 |
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| 基金项目： | 国家自然科学基金资助项目（41475019）；江苏省气象探测与信息处理重点实验室开放基金（KDXS1307）；江苏省气象科学研究所北极阁基金（BJG201407） |
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| 摘 要： | 大气折射率结构常数描述了大气湍流起伏的强弱,它表征了大气折射率随机不均匀性的剧烈程度。光波和无线电波在大气中传播时会受到大气湍流的影响而产生各种不良效应,如:光斑漂移、闪烁、相位起伏等。因此,对大气折射率结构常数的研究具有重要的意义。本文利用常规探空资料对微波波段大气折射率结构常数进行了仿真研究,结果表明:在低空,特别是大气边界层之内,大气折射率结构常数主要为湿度所贡献;在高空,大气折射率结构常数主要为温度所贡献。在微波波段,影响大气折射率结构常数最大的气象因子并不是温湿压的大小,而是它们梯度的大小,其中湿度梯度的大小对其影响最大,在实际的低空测量大气折射率结构常数时,主要考虑湿度梯度与温度梯度的影响。
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| 关 键 词： | 大气折射率结构常数 仿真 微波波段 |
| 收稿时间： | 2015/10/9 0:00:00 |
| 修稿时间： | 2/9/2016 12:00:00 AM |
Simulation research on structure constant of atmospheric refractive index in microwave band |
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| WEI Hao,HU Mingbao and AI Weihua.Simulation research on structure constant of atmospheric refractive index in microwave band[J].Scientia Meteorologica Sinica,2016,36(5):667-673. |
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| Authors: | WEI Hao HU Mingbao and AI Weihua |
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| Institution: | College of Meteorology and Oceanography, PLA University of Science and Technology, Nanjing 211101, China,College of Meteorology and Oceanography, PLA University of Science and Technology, Nanjing 211101, China and College of Meteorology and Oceanography, PLA University of Science and Technology, Nanjing 211101, China |
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| Abstract: | The structure constant of atmospheric refractive index describes the strength of atmospheric turbulence, and characterizes the random unevenness of the atmospheric refractive severity. Light and radio waves would be affected by atmospheric turbulence propagation in the atmosphere so as to produce a variety of bad effects, such as spot drift, flicker, phase fluctuations and so on. Therefore, the study on the structure constant of atmospheric refractive index has important significance. The conventional radiosonde data was used to conduct simulation research on the structure constant of atmospheric refractive index in microwave band. Results show that in the low altitude, especially in the atmospheric boundary layer, the atmospheric humidity is the main contribution to the structure constant of atmospheric refractive index, while in the high altitude, the main contribution is the atmospheric temperature. In the microwave band, the greatest impact on the structure constant of atmospheric refractive index is not the size of humidity, temperature and pressure,but their gradient, especially the humidity gradient. In the actual low-level measurement of Cn2,the size of humidity and temperature gradient should be mainly considered. |
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| Keywords: | Structure constant of atmospheric refractive index Simulation Microwave band |
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