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Fresnel-Region Fields and Antenna Noise-Temperature Calculations for Advanced Microwave Sounding Units

机译：高级微波探测装置的菲涅耳区域场和天线噪声 - 温度计算

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A transition from the antenna noise temperature formulation for extended noise sources in the far-field or Fraunhofer-region of an antenna to one of the intermediate near field or Fresnel-region is discussed. The effort is directed toward microwave antenna simulations and high-speed digital computer analysis of radiometric sounding units used to obtain water vapor and temperature profiles of the atmosphere. Fresnel-region fields are compared at various distances from the aperture. The antenna noise temperature contribution of an annular noise source is computed in the Fresnel-region (D squared/16 lambda) for a 13.2 cm diameter offset-paraboloid aperture at 60 GHz. The time-average Poynting vector is used to effect the computation.

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作者
Schmidt, R. F.;
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年度 1982
页码 p.1-42
总页数 42
原文格式 PDF
正文语种 eng
中图分类工业技术;
关键词
Antenna radiation patterns; Electromagnetic noise; Electromagnetic noise measurement; Far fields; Fresnel region; Microwave antennas; Microwave sounding; Noise temperature; Apertures; Digital computers; Poynting theorem; Radiometers; Temperature profiles; Wat;

机译：天线辐射方向图;电磁噪声;电磁噪声测量;远场;菲涅耳区;微波天线;微波探测;噪声温度;孔径;数字计算机;坡印定理;辐射计;温度分布; Wat;

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2. Comparison of simulated radiances, Jacobians and linear error analysis for the Microwave Humidity Sounder and the Advanced Microwave Sounding Unit-B [J] . THOMAS J. KLEESPIES, PHILIP WATTS Quarterly Journal of the Royal Meteorological Society . 2006,第621aPta3期

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4. Relative information content of the Advanced Technology Microwave Sounder, and the Advanced Microwave Sounding Unit and the Mi [C] . Kleespies, T.J. . 2006

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8. Fresnel-region fields and antenna noise-temperature calculations for advanced microwave sounding units [R] . Schmidt, R. F. 1982

机译：用于高级微波探测装置的菲涅耳区域和天线噪声温度计算

Fresnel-Region Fields and Antenna Noise-Temperature Calculations for Advanced Microwave Sounding Units

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