MODULATION HETERODYNE RADIOMETER

The proposed modulation heterodyne radiometer contains a microwave antenna, a switch at the output of the antenna, a mixer, an intermediate frequency signal amplifier, a square-law detector, a low-pass filter, a selective intermediate frequency signal amplifier, a synchronous detector, a recorder with an input low-pass filter, a low-frequency oscillator, a heterodyne, a power divider, a directional coupler, an attenuator, and additionally, a gain-controlled intermediate frequency signal amplifier, a differential amplifier, a stabilized voltage source, a balance modulator, and a valve element. The output of the oscillator is connected to the control inputs of the switch and synchronous detector.