RU2707419C1 - Method for georadiolocation sounding and device for its implementation - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: invention relates to geophysical survey methods, geophysical survey, particularly to high-frequency electrical prospecting. Method for georadiolocation sounding comprises feeding ultra-broadband pulses of meter and decimeter range of electromagnetic waves on analyzed medium from radiating antenna, reception of the electromagnetic pulses by the receiving antenna, registration of the reflected electromagnetic field from the boundaries with different contrast value of the relative dielectric permeability of the medium excited in the analyzed medium by the probing pulses of the electromagnetic field source in the transmitting antenna, storing the obtained data on an electronic carrier, processing the obtained data in specialized software packages and analyzing the radargrams with visualization of the object of analysis in the form of local or extended objects, besides, creating a background field in the analyzed medium which overlaps the obtained wave pattern of the georadar field.

EFFECT: technical result consists in expansion of time resolution of reflected signal.

5 cl, 4 dwg

Description

The invention relates to the field of geophysical research methods, geophysical work, in particular to high-frequency electrical exploration, also called georadar sensing, and more specifically to methods and devices for electrical exploration, and can be used to detect the contrast of the dielectric constant in the upper part of the section of various local objects, study the geological structure of land and other applied engineering problems.

In the modern market of geophysical equipment, there is a need for technologies containing the necessary set of components, capable of coplexing methods, for example, technologies for obtaining a reflected signal in the electromagnetic range, combined with the ability to change the properties of the medium, for example, using induced electromagnetic fields or fields of a different nature.

A known method of electrical exploration, including the excitation of an electromagnetic field by creating in the generator circuit a pseudo-random bipolar sequence of packets of periodic current pulses. The magnitude of the mutual correlation function (VCF) of the component (time derivative) of the magnetic or electric field and the shape of the current is calculated either with or without an initial shift ΔТ between the time series of the VCF. According to the readings of the VKF with a step equal to the period of the current pulses, one judges the impulse response of the geoelectric medium and from it - the structure of the geoelectric medium. By the difference in impulse reactions in the background and in the absence of a primary magnetic field, objects are distinguished by their induced magnetization, (patent RU 2354999 C1, 07/07/2007, G01V 3/08) However, this method does not allow to directly indicate the presence of search objects during field work, it is necessary to carry out the procedure for processing the received signals.

A device for georadar sounding "georadar" (radio-technical device of subsurface sounding RPPZ "OKO-2"), containing a receiving and transmitting antenna with removable antenna units of a central frequency of 1500 - 90 MHz (Certificate of Compliance No. 15.000.0581). The specified device does not allow to directly identify anomalies associated with local objects, or in rare cases it allows sufficient contrast of the dielectric constant, in particular, a software package with a number of procedures for processing the reflected signal to show the location of a local object is also needed to clarify the position of local objects .

Closest to the proposed one is a method implemented by a device for electrical reconnaissance and comprising applying electromagnetic waves to the test medium from a radiating antenna, receiving electromagnetic pulses by a receiving antenna, registering the reflected electromagnetic field from boundaries with different contrast ratios of the relative permittivity of the medium excited in the test medium by probing pulses electromagnetic field source in the transmitting antenna, storing the received data on an electronic nose Thus, processing the obtained data in specialized software packages and analysis of radarograms, with visualization of the object of study in the form of local (by diffracted waves) or extended objects (by reflected waves) (patent RU 2668306 C1, 11/20/2017, G01V 3/12)

However, this method also does not allow directly revealing anomalies associated with local objects directly from the obtained wave pattern.

Closest to the proposed one is a device (complex) for georadar sensing (containing a receiving and transmitting antenna, control and registration unit) located on a railway rolling unit (patent RU 118065 U1, 01/26/2012, G01N 22/00)

The specified device provides a different angle of reception of the reflected signal to clarify the position of local objects, and does not allow the combination of methods, the properties of the environment do not change, the labor costs of geophysical work increase.

The objective of the invention is to expand the temporal resolution of the reflected signal by creating a method of georadar sensing and a device for georadar sensing, in particular an electromagnetic field, by installing additional compact equipment and obtaining a low-frequency background field (backlight field), including not synchronized with the central emitting frequency of the georadar.

Another object of the invention is to minimize the processing of the reflected signal, in particular, the hardware implementation of the deconvolution operation, for which the device has an integrated processor with a set of modes for changing the frequencies of the background electromagnetic field.

The proposed invention is aimed at searching for geophysical anomalies characterizing the location of local objects, such as pipelines, high-voltage cables, archaeological objects, etc.

The problem is solved in that in the method of georadar sounding, which includes applying to the test medium ultra-wideband pulses of a meter and decimeter range of electromagnetic waves from a radiating antenna, receiving a receiving antenna of electromagnetic pulses, registering the reflected electromagnetic field from boundaries with different contrast ratios of the relative dielectric constant of the medium excited in the medium under investigation by probing pulses of an electromagnetic field source in a transmitting an Tenne, storing the received data on an electronic medium, processing the obtained data in specialized software packages and analyzing radarograms, with visualization of the research object in the form of local or extended objects, additionally create in the medium under study a background field superimposed on the resulting wave pattern of the georadar field.

Advantageously, an electromagnetic field is created in the medium under study, synchronized or not synchronized with the georadar field.

Advantageously, the frequency of supply of electromagnetic pulses, in the case of synchronization of the operation of the transmitting antenna, and the module for creating the background field, is changed according to a certain algorithm depending on the frequency of the background field, or the background field is changed according to a predetermined algorithm in accordance with a given frequency of pulses in the transmitting antenna, in depending on the objects of study according to the technical specifications.

The problem is solved in that the device for georadar sensing, contains a georadar with a radiating antenna unit of the required center frequency and a receiving antenna, a device for visualizing the wave pattern, a software package for processing the received data for the georadar, the device being equipped with a background field module mounted on the georadar and having independent power supply from a georadar.

Mostly, the power supply of the module for creating the background field is made in the form of an individual battery, or in the form of a power supply common to the georadar.

The specified implementation of the device allows you to set various modes of the backlight field by creating an electromagnetic background field, in particular, several times lower than the center frequency of the georadar used.

The proposed method and device are illustrated by illustrations in which:

in FIG. 1 shows a heterodyne receiver circuit;

in FIG. 2 illustrates a regenerator model;

in FIG. 3 illustrates the current-voltage characteristic of the detector;

in FIG. 4 shows a block diagram of a device for georadar sensing.

Recent progress in the field of GPR has undoubtedly been associated with the development of microprocessor technology in the field of storage and processing of digital signals received, which makes it possible to make equipment more compact compared to the developments of past years. The development of GPR technologies in the direction of increasing the depth of GPR sounding showed the complexity of this direction. The hardware implementation of attempts to increase the depth of research was carried out either by increasing the power of the emitting antenna (correspondingly increasing the size of the equipment, the need to comply with sanitary norms of the emitting field when working in settlements), or lowering the central frequency of the emitting signal (here there are problems with processing the received data taking into account non-linear distortions ) The further development of technologies for the use of georadar for the tasks of engineering surveys, archeology and the search for minerals is associated with the development of programs for processing received signals (wavelet transforms, attribute analysis, etc.), or with the hardware implementation of software algorithms, for example, with an attempt to increase the resolution method.

Depth resolution is the minimum depth distance at which two reflecting objects or their details can be distinguished [Vladov ML, Starovoitov AV, 2004. Introduction to GPR. Moscow State University Publishing House, Moscow, p. 41]. When processing and interpreting wave fields in seismic and georadar, the deconvolution procedure is used to increase the resolution, which serves to compress the probe pulse with which the radarogram was obtained, reduce its duration, reduce the interval on the path, “covered” by the reflected wave, and thereby increase the possibility to select on the record the axis of phase matching of the reflected waves from close boundaries or objects. The procedure can be performed in two forms - in the form of impulse deconvolution or in the form of predictive deconvolution. Impulse deconvolution uses the form of a probe pulse, into the complex spectrum of which the complex spectrum of the path is divided. In the ideal case, narrow peaks should remain on the result of the inverse Fourier transform, the position of which corresponds to the arrival times of reflections. In practice, multiphase pulses remain on the resulting path, but are shorter in time than the initial probe signal. This is due to the fact that all of the above operations can be performed only in a limited frequency band, where the spectrum of the probe pulse does not vanish [Vladov ML, Starovoitov AV, 2004. Introduction to GPR. Moscow State University Publishing House, Moscow, p. 56-57]. It is known, for example, the impact on the medium of an elastic (seismic) field and a change in its conductivity as a result of this [Svetov BS 2008. Fundamentals of geo-electrics. LKI Publishing House, Moscow, p. 474]. Under real conditions, the geological environment is in an energy-unstable state [Ivanov AG, 1949. Seismoelectric effect of the first kind in the electrode regions. Reports of the Academy of Sciences of the USSR, Volume 68, p. 53-56]. This instability manifests itself in a wide range of spatial scales - from the scale of porous and polyphase rock to the scale of regional geological structures. Therefore, even weak impacts on such a medium by a seismic field can lead to its significant changes (in particular, to a change in its electrical resistance) [Ozerkov E.L., Ageeva O.A., Osipov V.G., Svetov B.S. Tikshaev VV, 1998. On the influence of vibration on the electrical properties of the geological environment. Geophysics, No. 3, p. 30-34]. From the dynamics of changes in the sections of the apparent resistance obtained by the method of formation of the field, one can see how the geoelectric section changes sharply immediately after vibration exposure and how slowly and incompletely it relaxes to the initial state. Changes in temporary seismic sections were noticed when the medium was fed with a constant or alternating electric field. In GPR, when solving the problem of increasing the resolution, studies were undertaken with different orientations of the receiving and transmitting antennas relative to each other [C.S. Bristov and H.M. Jol, Ground Penetrating Radar in Sediments, 2003 Published by The Geological Society, London. “Influence of antenna configuration for GPR survey: information from polarization and amplitude versus offset measurements”, page 299]. The authors refer to studies using GPR sounding to search for various metal objects [Van Gestel, J.-P. and Stoffa, P.L. 2001. Application of Alfort rotation to ground-penetrating radar data. Geophysics, 66, 1781-1792] and voids at the top of the section.

The proposed method consists in conducting GPR sounding under the action of a background electromagnetic field. The applicant conducted research with the aim of hardware implementation of the operation of deconvolution using a background field (backlight field), in order to increase the resolution of the method. To clarify the physics of the process, the obtained spectrum in the initial radarograms is analyzed. When analyzing the obtained spectrum, it is seen that in the useful signal, under the influence of the background field, the spectral density has shifted to a higher frequency, i.e. we have a hardware analogue of the deconvolution operation. For an optimal inverse compression filter, the desired filtering result is an extremely short pulse — the delta function: g (t) = δ (t).

As a result, from the Wiener-Kolmogorov equation

h (τ) b _y (θ-τ) dτ = r _gy (θ), where h (τ) is the filter operator, b _y (θ) is the autocorrelation function of the initial trace, r _gy (θ) is the cross-correlation function of the given momentum, and source track. Given the independence of the signal and interference, and the zero mathematical expectation of the latter, we obtain

Similar to the operation of the deconvolution operation, the action of the backlight field increased the temporal resolution of the recording. An important condition for the effectiveness of reverse filtration is the presence in the spectrum of useful waves of sufficiently intense high-frequency components [G.N. Boganik, I.I. Gurvich, 2006. Seismic exploration. AIS Publishing House, Tver, p. 464, p. 472].

A possible hardware implementation of increasing the resolution can be a linear transformation of the received wave of the radio frequency range into a low, sound one, known in the theory of radio wave propagation as a heterodyne reception. The first models of heterodyne receivers used spark transmitters and detector receivers based on the coherer - a glass tube with leads filled with iron filings. Under the influence of the field of the incoming wave, microscopic discharges arose between the sawdust, conducting bridges formed, and the coherer's resistance sharply decreased, which led to the operation of the receiver relay. In experiments, it was noticed that the sensitivity of the receiver to weak signals increases if an own generator is connected to the receiver, even if it is low-power, tuned to a frequency close to the frequency of the received signal. The own oscillator was called the local oscillator, and the receiver was called the local oscillator. A number of varieties of heterodyne receivers are distinguished, using various signal processing methods and designed to receive signals with different types of modulation. In the heterodyne receiver (Fig. 1), two signals act on the detector - the input and the heterodyne, which is much larger in amplitude. If the frequency of the local oscillator G2 is slightly (0.4 ... 1 kHz) different from the frequency of the transmitter G1, the output voltage of the detector VD1 is observed beating voltage with a differential frequency. It is significantly more than the voltage of the detected signal, which increased both the sensitivity and the reception volume.

Amplitude modulation has been widely used to transmit telephone signals, and tube receivers have been widely used for reception. Direct gain receivers contained 1 ... 2 radio frequency amplification stages, a tube detector, and several audio frequency amplification stages. The positions of direct amplification receivers were significantly strengthened by the regenerator. Thanks to the feedback, both the sensitivity and selectivity of the direct gain receiver increased.

The widespread use of the regenerator revealed several aspects of its use. Consider them on the example of a regenerator model (Fig. 2).

Fluctuations in the received signal from the antenna enter a single circuit L2C1 and then detected in the grid circuit of the lamp using elements R1C2. In the anode circuit of the lamp, in addition to the detected signal (which is released on the load R2 and enters the audio frequency amplifier), there are radio-frequency oscillations. Through the feedback coil, they again enter the circuit and compensate for the loss in it. By increasing the coupling of coils L3 and L2, one can very close to the threshold of self-excitation of natural vibrations. At the same time, the sensitivity and selectivity of the receiver increase significantly, but the bandwidth of the circuit narrows. For example, the equivalent quality factor of a circuit up to several thousand is quite real, which corresponds to a bandwidth of several kilohertz even at short waves:

- эквивалентная добротность.where 2Δƒ is the passband, ƒо is the tuning frequency,

- equivalent quality factor.

However, the slopes of the resonance curve of one circuit turned out to be gentle, only 6 dB per octave of detuning, and the stability of the regenerator was low - it either lost sensitivity and selectivity with a decrease in feedback, or it was self-excited when it increased.

There are other possible modes of operation of the described device. When feedback is more critical, self-excitation occurs, beats begin to stand out between the natural oscillations and the oscillations of the signal. Having set the beat frequency in the sound range, the regenerator in this mode is called differently - the autodyne receiver, emphasizing the fact that there was a heterodyne reception using its own self-oscillations. In English literature, autodyne is called self-heterodyne receiver.

An even more careful adjustment of the feedback near the excitation threshold can achieve a small amplitude of natural oscillations in the regenerator circuit, while the possibility of a synchronous reception of amplitude-modulated signals arose, the receiver is called a synchrodin. The essence of synchronous reception is as follows: when the receiver is tuned to the carrier frequency of the amplitude modulation signal, the natural oscillations are captured by it and become synchronous and in phase with the carrier. The reception of amplitude-modulated signals is improved, since when the carrier rises due to its own vibrations, the level of the detected signal increases, selectivity improves, noise and distortion decrease. The capture band can be found from the relation:

Q _o is the structural quality factor of the circuit, a1 is the amplitude of the carrier signal, and a2 is the amplitude of the natural oscillations; to increase the capture band, it is necessary to reduce the amplitude of excitation and the intrinsic Q factor of the circuit.

To quantify the benefits of heterodyne reception, we analyze the operation of the detector receiver.

Let the input undamped signal have the form

The current-voltage characteristic of the detector i (u) (Fig. 3) can be represented next:

The coefficient S is called the slope of the characteristic (the reciprocal of the internal resistance of the diode at the operating point), and T is the curvature. With a small amplitude of the signal, the higher terms of the series can be neglected, since

The detector in this case is quadratic. Substituting the value of u in the expression for i, we obtain:

соответствующий компоненте постоянного, продетектированного тока. Его амплитуда пропорциональна квадрату амплитуды входного сигнала. Сопротивление нагрузки из условия согласования (отдачи в нагрузку максимальной мощности) выбирается приблизительно равной внутреннему сопротивлению детектора R_i=1/S. Тогда полезное напряжение на нагрузке:Naturally, the current components with radio frequencies for ω ₁ and 2ω ₁ do not act on the load (relays, telephones). To close them in parallel with the load, a blocking capacitor is included. Member remains

corresponding to the component of the direct current detected. Its amplitude is proportional to the square of the amplitude of the input signal. The load resistance from the matching condition (maximum power output to the load) is selected approximately equal to the internal resistance of the detector R _i = 1 / S. Then the useful voltage at the load:

In the heterodyne receiver, two signals are already acting on the detector - the input and the local oscillator:

The useful voltage at the detector output is as follows:

The first term corresponds to the detected voltage of the signal, the second to the local oscillator, and the third to the beats between the oscillations of the signal and the local oscillator. This last term depends on the signal amplitude and _{1 is} no longer quadratic, but linear, which radically changes the matter. With a sufficient amplitude of the heterodyne voltage a ₂ (0.1 ... 0.15 V), the transmission coefficient of the beat signal is close to unity and the beat voltage in the load is almost equal to the voltage of the RF signal. A further increase in the amplitude of the local oscillator almost does not increase the transmission coefficient (it cannot be more than unity in the passive element).

So, a useful effect in the heterodyne receiver is not detection, but the conversion of the signal in frequency with the release of a low sound frequency of the beats:

The detected current is eliminated by using a balanced mixer, at one input of which a signal voltage is supplied, at the other - a local oscillator.

The element where the conversion of radio frequency to sound frequency occurs is called a mixer, or frequency converter. Moreover, if it detects a signal at least to a small extent, the noise immunity of the local oscillation reception will deteriorate, because interfering signals with a frequency different from the signal frequency are also detected. An ideal mixer performs the operation of multiplying the input and heterodyne signals:

The total frequency is filtered at the output of the mixer, and the useful voltage is allocated:

The formula contains only fluctuations of the difference frequencies and its amplitude is proportional to the amplitude of the signal. The radio frequency spectrum of the received signals is linearly transferred to the region of sound frequency and filtering at the sound frequency is as effective as at radio frequencies in direct amplification receivers.

где m и

- любые положительные и отрицательные целые числа. Пусть в емкость в параллель подключено бесконечное число линейных цепей, сотоящих из фильтра Ф и сопротивления R. Фильтры считаем идеальными, т.е. пропускающими токи только одной частоты, соответствующей определенному значению чисел m и

. На каждом активном сопротивлении R выделяется

на частоте

пропущенной соответствующим фильтром Ф. От внешних генераторов накачки и сигнала поступают мощность P₁₀ на частоте накачки ω_н и мощность Р₀₁ на частоте сигнала ω₁. Если нелинейная емкость свободна от потерь, то она не потребляет энергии, а преобразует поступающую на нее мощность в мощность колебаний

на различных комбинационных частотах. Будем считать мощность, вводимую в систему, положительной, а мощности, рассеиваемые на сопротивлениях, - отрицательными. Тогда закон сохранения энергии для рассматриваемой системы можно записать в видеAgainst the background of the beat, diffracted waves from local objects have similar speeds, differing in frequency. This parametric system is an analog of a nonlinear reactive and linear circuit with circuits tuned to the combination frequencies of external signals. Manley and Row [Manley J., Rowe N. - Proc. IRE, 1956, 44, 904] showed that between the powers allocated in each of the circuits, there are certain relationships. These relations allow us to determine the maximum gains and transformations of a complex parametric system. Consider the behavior of a nonlinear capacitance under the action of two emfs incommensurable frequencies ω ₁ and ω _n (pump frequency). If the relationship between the charge and voltage u _C at this capacitance is unambiguous, then the charge at the nonlinear capacitance will contain combination frequencies of the form

where m and

- any positive and negative integers. Let an infinite number of linear circuits connected from the filter Ф and resistance R be connected to the capacitor in parallel. We consider the filters ideal, i.e. passing currents of only one frequency corresponding to a certain value of numbers m and

. At each resistance, R stands out

on frequency

passed by the corresponding filter F. From the external pump and signal generators, power P ₁₀ at the pump frequency ω _n and power P ₀₁ at the signal frequency ω ₁ are supplied. If the nonlinear capacity is free from losses, then it does not consume energy, but converts the power supplied to it into oscillation power

at various combination frequencies. We assume that the power introduced into the system is positive, and the powers dissipated at the resistances are negative. Then the energy conservation law for the system under consideration can be written as

Besides this obvious relation, there are energy relations between powers called equations or Manly-Row relations:

These relations can be obtained by multiplying the expressions for voltages and currents with the corresponding frequencies. From the form of the Manley-Row relations it follows that regardless of the type of linearity and the type of energy consumer, the distribution of power over the combination frequencies is determined by the magnitude and signs of the combination frequencies. Consider the case where long-term interaction in a nonlinear medium is possible for three waves with different frequencies [V.V. Migulin, V.I. Medvedev, E.R. Mustel, V.N. Parygin, 1978. Fundamentals of the theory of oscillations. Publishing House "Science", Moscow]. Effective interaction of these waves is possible under the condition of synchronism

Due to the dispersion of the medium, we exclude from consideration the waves of all frequencies other than ω ₁ , ω ₂ and ω ₃ . Therefore, the voltage in the line will be:

where z is the distance traveled by the wave.

The interaction of the waves manifests itself in the form of spatial beats, the effect of low-frequency energy pumping occurs periodically from the frequency wave ω ₁ to the frequency wave ω ₃ . The ratio between the maximum amplitudes of the interacting waves will be

Thus, the distribution of peak values in the spectrum in the presence of a background field becomes more contrasting, the maximum values are shifted to the higher frequency component.

An increase in the resolution and, consequently, the accuracy of the position of local objects is necessary for searching and mapping such objects as high voltage cables, rain sewer pipes and water pipes and other objects, which usually lie at shallow depths - up to two to three meters. The absolute values of the corrections are (for depth marks) from 0.1 m to 0.5 m. The accuracy is comparable to half the wavelength of the AB-150 GPR used (λ / 2 of the order of 0.3 m). When determining the increase in resolution in depth, it is enough to trace the position of the first arrivals of the received signal.

The effect of applying a background field to the reflected field of the GPR leads to a hardware analogue of the deconvolution operation with the appearance of high-frequency components in the resulting spectrum, increasing the accuracy of determining the position of local objects in depth to 12-14%, which in the case of high voltage cables (or gas pipes) would allow to reduce risks during prospecting works related to both the re-arrangement of communications and repair work. In addition, after applying the background field, the wave pattern “gathered”, similar to the “lens” effect. In the resulting wave pattern, without any preliminary operations for processing the received signal, local objects become more contrasting and distinct due to the appearance of high-frequency components, making it easier for the operator to identify and map the necessary objects.

As shown in FIG. 4, the device for georadar sensing comprises a georadar 1 with a radiating antenna unit 2 of the required center frequency and a receiving antenna 3, a device for visualizing the wave pattern 4, a software package 5 for processing the received data for the georadar, the device being equipped with a background field creating module 6 mounted on the georadar and the module for creating the background field 5 is provided with an electric power 7 independent of the GPR.

The power supply 7 can be made in the form of a 12 V battery.

The device operates as follows.

The module for creating the background field 6 is mounted on the GPR 1, which is turned on first with the creation of standard parameters, including the duration of the time base, the dielectric constant of the medium, etc. Next, the power supply 7 from the 12 V battery is supplied to the module for creating the background field 6, where the current is converted depending on the given algorithm of the software package 5. The corresponding current conversion is necessary to create an electromagnetic field of the corresponding frequency and amplitude, algorithms whose creations are selected depending on the object of research. The operator can directly judge the resulting wave pattern from the screen of the visualization device 4. Depending on the results obtained, and, possibly, after processing the received data in software package 5, it is possible to change the parameters of the generated background electromagnetic field.

The proposed design of the device for creating the background field allows you to get the necessary frequency and amplitude of the background electromagnetic field, including, will allow you to produce a non-frequency pumping of the reflected signal, creating the effect of the lens in the resulting wave pattern. In addition, the proposed device allows you to reliably map the identified anomalies associated with local objects without resorting to a software package, directly in the field, determining the location of the search objects and thereby improve productivity.

It will be apparent to one skilled in the art that various modifications and changes are possible in the present invention. Accordingly, it is intended that the present invention covers the modifications and variations as well as their equivalents without departing from the spirit and scope of the invention disclosed in the appended claims.

Claims (5)

1. A method of georadar sensing, including the application of ultra-wideband pulses of a meter and decimeter range of electromagnetic waves to the test medium from the emitting antenna, receiving electromagnetic pulses by the receiving antenna, registering the reflected electromagnetic field from the boundaries with different contrast ratios of the medium, which is excited in the test medium by probing pulses the source of the electromagnetic field in the transmitting antenna, storing the received data on electronic media, processing the obtained data in specialized software packages and analysis of radarograms with visualization of the object of study in the form of local or extended objects, characterized in that they additionally create a background field in the medium under study that overlaps the resulting wave pattern of the georadar field. 2. The method according to p. 1, characterized in that in the test medium create an electromagnetic field, synchronized or not synchronized with the field of georadar. 3. The method according to p. 1, characterized in that the frequency of the supply of electromagnetic pulses, in the case of synchronization of the transmitting antenna and the module for creating the background field, is changed according to a certain algorithm depending on the frequency of the background field or the background field is changed according to a predetermined algorithm in accordance with a given the frequency of the pulses in the transmitting antenna, depending on the objects of study according to the terms of reference. 4. A device for ground penetrating radar sensing, comprising a georadar with a radiating antenna unit of the required center frequency and a receiving antenna, a device for visualizing a wave pattern, a software package for processing the received data for a georadar, characterized in that the device is equipped with a background field creating module mounted on the georadar, and the background field creation module is provided with power supply independent of georadar. 5. The device according to p. 4, characterized in that the power supply of the module for creating the background field is made in the form of an individual battery or in the form of a power supply common to the georadar.

Images