DEVICE FOR MEASURING THE NATURAL PULSE ELECTROMAGNDEVICE FOR MEASURING THE NATURAL PULSE ELECTROMAGNETIC FIELD OF THE EARTH ETIC FIELD OF THE EARTH

摘要

The proposed device for measuring the natural pulse electromagnetic field of the Earth can be used in exploring mineral resources. The device contains a magnetic antenna, the antenna signal amplifier, a set of narrow-band filters, a gain-controlled amplifier, an analog-to-digital converter, a microprocessor computing unit, a threshold-controlled discriminator, and additionally, a multichannel adaptive rejection filter. The input of the discriminator is connected to the output of the gain-controlled amplifier. The input of the rejection filter is connected to the output of the gain-controlled amplifier, and the outputs are accordingly connected to the inputs of the narrow-band filters and the input of the computing unit. The proposed device uses a method for parallel spectral analysis and adaptive filtration of signals for suppressing intense narrow-band interferences. According to this method, each narrow-band filter with a threshold level that exceeds the level of an input signal provides the detection of a narrow-band interference in the input signal, and the corresponding signal processing channel is turned off if such a narrow-band interference is present.