Conceptual Radiometer Design Studies for Earth Observations from Low Earth OrbitNational Aeronautics and Space Administration, Langley Research Center, 1994 - Radiometers - 42 pages |
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1/f noise antenna radiometric temperature antenna temperature measurement balanced Dicke radiometer bandwidth cold-sky antenna Conceptual Radiometer Design constant temperature enclosure detection radiometer receiver Dicke radiometer system direct detection radiometer Direct detection receiver double sideband homodyne Effective input noise effects of mismatch ERROR ANALYSIS error sources external calibration feed horn gain variations hot load induced gain fluctuations injected noise input noise temperature internal calibration technique Langley Research Center low Earth orbit low noise amplifiers Microwave Radiometer mixer NASA noise figure noise injection radiometer noise power NUMBER Old Dominion University output voltage physical temperature power spectral density preamplifier radiometer design study radiometer receiver configuration radiometer system configuration Radiometer system performance radiometric antenna temperature radiometric brightness temperature reference load reflection coefficients RF frequency Root Sum Square scene antenna signal processor portion single sideband heterodyne spaceborne radiometers square law detector total power radiometer TREC TREF unbalanced Vout Waveguide Worst Case Error