The paper deals with the physical fundamentals of the phase geoelectric method of induced polarization (IP) based on the extraction of information from the natural electromagnetic field of the Earth (NEMFE) in the frequency range 0.1–20.0 Hz. Scientific and technical justification is provided for the differential measurement circuit parameters of the NEMFE and the algorithm of processing of the received signals with the calculation of the IP coefficient, assuming the identity of the field characteristics in two receiving lines. The method consists in recording random noise signals from two adjacent receiving electrical dipoles with simultaneous memorizing of the amplitudes and their automatic equalization. Then the difference between the signals is calculated, with subsequent energy normalization. The presented theoretical fundamentals for the calculation of the IP coefficient of the NEMFE and the processing algorithm were tested in laboratory experiments. Under the assumption of the complete identity of the medium beneath the receiving dipoles, the IP coefficient was 0.01–0.03, due to the error in the elemental base of the analog input path. The paper also presents the results of field experiments on the Samson iron deposit in the Republic of Khakassia. The experimental work confirmed the effect of IP on the NEMFE in the anomalous area and showed that the results are consistent with theoretical and laboratory predictions and the data obtained using a KEP-M pulse system. It is concluded that this method can be used to detect productive anomalies and has an advantage of eliminating artificial sources of excitation of geologic sections.

The article considers a radio navigation method for determining the coordinates of marine underwater vehicles (UV) without surfacing (including under Arctic pack ice) based on electromagnetic (EM)–acoustic (AC) wave interaction in the skin layer of sea water. Energy estimates for the radio channel are obtained as a function of water conductivity and UV location depth. The results of laboratory tests are shown, confirming the parametric effect and the use of this phenomenon for receiving electromagnetic signals underwater at the difference frequency of EM and AC oscillations.

—We provide an analytical assessment of electrical and seismic signals of the seismoelectrical effect over a hydrocarbon deposit in the sea with seismic wave excitation using pulsed nonexplosive sources and reception by automatic underwater vehicles. The hardware complex required for the implementation of the method is described. Methods for suppressing reverberation interference are considered.