NASA NTRS · 19730000345
Improved noise-adding radiometer for microwave receivers
Abstract
Use of input switch and noise reference standard is avoided by using noise-adding technique. Excess noise from solid state noise-diode is coupled into receiver through directional coupler and square-wave modulated at low rate. High sensitivity receivers for radioastronomy applications are utilized with greater confidence in stability of radiometer.
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Batelaan, P. D., Stelzried, C. T., Goldstein, R. M.. 1973-08-01. Improved noise-adding radiometer for microwave receivers. https://ntrs.nasa.gov/citations/19730000345
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