FIELD: geophysics.
SUBSTANCE: method can be used for finding coordinates of epicenter of expected earthquake, rock bumps and for inspection of electromagnet situation in seismic-dangerous zone of Earth's crust from board of flying vehicle. Method provides total suppression of false electromagnet radiations received by additional channels. Method is based upon frequency conversion of received electromagnet signal in measuring channel. Calibrating harmonic signal is formed additionally which signal has frequency being different from intermediate frequency by insignificant value. Calibrating signal is sent through two receiving sections. Calibrating signals are selected after they passed through the channels. Amplitude difference is measured and used for controlling transmission factor modulus of intermediate frequency amplifiers. Phase difference of output calibrating signals is measured and subsequently used for controlling phase shift in intermediate frequency amplifiers.
EFFECT: improved performance in terms of error probability; improved precision.
4 dwg
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