MULTICHANNEL NULL RADIOMETER Russian patent published in 2012 - IPC G01R29/08 

FIELD: physics.

SUBSTANCE: in a radiometer, having a matched load, series-connected antenna and directional coupler, series-connected noise generator, series-connected receiver, low-frequency preamplifier, synchronous filter, low-frequency amplifier and high-pass filter, a comparator whose second input is connected to the common bus of the radiometer, includes a microcontroller, a high-frequency selector, n-1 series-connected receivers, low-frequency preamplifiers, synchronous filters, low-frequency amplifiers, high-pass filters, comparators whose second inputs are connected to the common bus of the radiometer, n-1 matched loads, n circulators whose first inputs are connected to n outputs of the high-frequency selector, the second inputs are connected to n matched loads, and outputs are connected to inputs of n receivers, the output of the directional coupler is connected to the input of the high-frequency selector, the first input of the comparator is connected to the output of the high-pass filter, outputs of the n comparators are connected to n inputs of the microcontroller, the first and second outputs of which are respectively connected to control inputs of the high-frequency selector and a high-frequency switch, m outputs are connected to control inputs of n synchronous filters, and the third output of the microcontroller is the output of the radiometer.

EFFECT: high fluctuation sensitivity of measurements.

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