Radiometric absolute noise-temperature measurement system features improved accuracy and calibration ease

Radiometric receiver system, which measures noise temperatures in degrees Kelvin, does not require cryogenic noise sources for routine operation. It eliminates radiometer calibration errors associated with RF attenuation measurements. Calibrated noise source is required only for laboratory adjustment and calibration

Method and means for providing an absolute power measurement capability Patent

Input radio frequency circuit for switching type absolute temperature measuring radiometer for noise source