RADIOMETER Russian patent published in 2003 - IPC

FIELD: passive radiolocation, measurement of weak noise signals. SUBSTANCE: proposed radiometer has antenna, receiver, high-pass filter, synchronous filter, comparator, control unit with one input and first, second, third and fourth outputs, fourth output being output of digital bus of radiometer, first and second band-pass filers, thermostatted plate on which there are installed in thermal contact first and second identical matched loads, first and second identical modulators. First matched load is connected to first input of first modulator, third output of control unit is connected to controlling input of synchronous filter, second input f comparator is coupled to zero bus of radiometer and its output is linked to input of control unit. Radiometer also incorporates preamplifier and amplifier. Input of preamplifier is connected to output of receiver and its output is linked to synchronous filter, amplifier, high-pass filter and first input of comparator connected in series. Antenna is connected to input of first modulator which output is connected through first bandpass filter to first input of second modulator. Second matched load is connected to second input of second modulator through second band-pass filter. Output of second modulator is connected to input of receiver. Controlling inputs of first and second modulators are connected correspondingly to first and second outputs of control unit. EFFECT: widened functional capabilities of radiometer. 4 dwg