| 微波辐射计接收机的逆向辐射噪声对天线定标的影响仿真 |
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| 引用本文： | 李志平,赵冬末,苗俊刚.微波辐射计接收机的逆向辐射噪声对天线定标的影响仿真[J].遥感技术与应用,2007,22(2):268-271. |
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| 作者姓名： | 李志平 赵冬末 苗俊刚 |
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| 作者单位： | (北京航空航天大学电磁工程实验室,北京 100083) |
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| 摘 要： | 基于有限积分算法,仿真计算了微波辐射计接收机的逆向辐射噪声温度对于接收天线口面的附加温度,并根据CST仿真软件计算结果,对照给定的简化理论模型,具体分析了微波辐射计逆向辐射噪声温度微波辐射计定标桶罩以及天线口面位置的影响。
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| 关 键 词： | 逆向辐射 亮温 定标 |
| 文章编号： | 1004-0323（2007）02-0268-04 |
| 收稿时间： | 2006-12-11 |
| 修稿时间： | 2006-12-112007-03-09 |
Simulation Study of the Effect on Inverse Radiation Thermal Noise of Microwave Radiometer on Antenna Calibration |
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| LI Zhi-ping,ZHAO Dong-mo,MIAO Jun-gang.Simulation Study of the Effect on Inverse Radiation Thermal Noise of Microwave Radiometer on Antenna Calibration[J].Remote Sensing Technology and Application,2007,22(2):268-271. |
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| Authors: | LI Zhi-ping ZHAO Dong-mo MIAO Jun-gang |
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| Affiliation: | (Beihang University,Beijing100083,China) |
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| Abstract: | The receiving antenna effective temperature which is caused by the microwave noise sources of the inverse radiation are simulated in CST based on FIT(finite integration technique).According to the simplified model,the effect of the noise temperature,the calibration metal shield and the location of the receiving antenna are analyzed in detail.The calibration source of the microwave radiometer is mostly made by RAM(Radio Absorb Material) with high RL(Return Loss).Under this condition,the received brightness temperature is composed of two parts.One is from calibration source which is reflected by metal shield,the other is from inverse radiation thermal noise which is penetrated antenna aperture and reflected by the calibration source then received by the antenna.The coherent addition on the inverse radiation thermal noise which is directly reflected by the receiving antenna and reflected by the calibration source is considered in this simplified model.However,the effective of the metal shield and the coupling between the shield and the antenna are considered moreover in FIT.According this simulation,about the 1K antenna temperature is attributed to the inverse radiation thermal noise temperature 400 K. |
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| Keywords: | Inverse radiation Brightness temperature Calibration |
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