| 摘要: |
| 相比于实孔径微波辐射计，一维综合孔径微波辐射计的空间分辨率较高，且具有多个入射角。本文提出采用一个观测频率为6.9，10.65，18.7，23.8和36.5 GHz，且入射角范围是0°~65°的一维综合孔径微波辐射计遥感大气海洋环境要素。为了开发适用于该辐射计的大气海洋环境要素反演算法，需要评估亮温在0°~65°范围内对大气海洋环境要素的敏感性。本文将海面发射率模型和大气辐射模型组合，建立了适用于一维综合孔径微波辐射计的微波大气海洋辐射传输正演模型，并计算了观测频率的垂直和水平极化亮温在0°~65°范围内对大气海洋环境要素的敏感性系数。结果表明：垂直和水平极化亮温对大气海洋环境要素的敏感性表现出不同特性，且敏感性随入射角的变化非常明显。6.9和10.65 GHz对海面温度的敏感性较大，且敏感性随着海面温度的增大而增大。10.65和18.7 GHz对海面风速的敏感性相对较大，且敏感性最大的风速区间位于10 m/s ~20 m/s。23.8 GHz对大气水汽含量的敏感性最大，其水平极化亮温对大气水汽含量的敏感性最大可达4 K/mm。36.5 GHz对云液态水含量最敏感，其水平极化亮温对云液态水含量的敏感性最大可达0.45 K/(0.01 mm)。 |
| 关键词: 一维综合孔径微波辐射计 高空间分辨率 多入射角 敏感性分析 |
| DOI： |
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| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| Sensitivity analysis of atmospheric and oceanic environmental parameters based on one-dimensional synthetic aperture microwave radiometer |
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fengmengyan1, aiweihua1, liumaohong1, chenguanyu2, luwen1
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1.National University of Defense Technology;2.PLA Troop 32033
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| Abstract: |
| Compared with the real aperture microwave radiometer, the one-dimensional synthetic aperture microwave radiometer has a higher spatial resolution and multiple incidence angles. In this paper, a one-dimensional synthetic aperture microwave radiometer with observation frequencies of 6.9, 10.65, 18.7, 23.8 and 36.5 GHz and an incidence angle range of 0° to 65° is proposed to obtain the atmospheric and oceanic environmental parameters. In order to develop retrieval algorithms for the radiometers, it is necessary to evaluate the sensitivity of the brightness temperature to the environment parameters in the range of 0°~65°. The sea surface emissivity model and atmospheric radiation model are combined to establish a microwave radiation transmission forward model that is suitable for the one-dimensional synthetic aperture microwave radiometer, and the sensitivity of the vertical and horizontal polarization brightness temperature to the environment parameters in the range of 0°~65° is calculated. The results show that the sensitivity of vertical and horizontal polarization brightness temperatures to the environmental parameters exhibits different characteristics, and the sensitivity varies significantly with incidence angle. 6.9 and 10.65 GHz are more sensitive to sea surface temperature, and the sensitivity increases with increasing sea surface temperature. The sensitivity of 10.65 and 18.7 GHz to sea surface wind speed is relatively large, and the range with the greatest sensitivity is between 10 m/s and 20 m/s. 23.8 GHz is the most sensitive to atmospheric water vapor content, and the sensitivity of horizontal polarization brightness temperature can reach a maximum of 4 K/mm. 36.5 GHz is the most sensitive to cloud liquid water content, and the sensitivity of horizontal polarization brightness temperature can reach a maximum of 0.45 K/(0.01 mm). |
| Key words: One-dimensional synthetic aperture microwave radiometer high spatial resolution multiple incidence angles sensitivity analysis |