MICROWAVE RADIOMETER Russian patent published in 2001 - IPC

FIELD: passive radio detection and finding for measurement of weak noise signals in microwave band. SUBSTANCE: the radiometer has an antenna, matched load, series-connected modulator, receiver, pulse amplifier, high-pass filter, synchronous filter, comparator, control unit, controlled current source, noise-voltage generator, attenuator, directional coupler; the controlled current source, noise-voltage generator, attenuator, directional coupler, matched load and modulator are positioned on a thermostatted plate in a thermal contact with it, the second input of the comparator is connected to a common wire, the output of the directional coupler is connected to the first input of the modulator, whose control input is connected to the second output of the control unit, whose third output is connected to the control input of the synchronous filter, and the fourth output of the control unit serves as the radiometer output, the output of the matched load is connected to the second input of the directional coupler, and the antenna is connected to the second input of the modulator. EFFECT: measurement of signal power with a high effective noise temperature. 5 dwg