Method of determining static geomagnetic field during sea magnetic survey

FIELD: physics.

SUBSTANCE: geomagnetic field variation is measured simultaneously with two or more magnetometric transducers mounted on mobile carriers placed along the direction of motion. An additional magnetometric transducer is placed 100-200 m from the sea surface on the vertical, said transducer being able to move along as well as across the direction of motion of the first transducer. The speed of the additional magnetometric transducer is at least an order higher than that of the first transducer. A second additional magnetometric transducer lying deep in the sea environment on a carrier is also used to measure geomagnetic field variations. The carrier of this transducer is a self-propelled control device fitted with navigation and hydroacoustic measurement and communication apparatus. The second additional magnetometric transducer can move along as well as across the direction of motion of the first transducer. During survey, inclination of the magnetic field vector is also measured, from which the ratio of gravitational field components Vzz and Vzx are determined.

EFFECT: high accuracy of determining static geomagnetic field.

 

The invention relates to the field of Geophysics, and more particularly to a method of determining variations of the geomagnetic field when conducting magnetic surveys, mainly in marine magnetic survey.

Known methods of determining the stationary variations of the geomagnetic field [1-3], which uses data from the mV stations (MBC), installed in the area of the shooting; the required number of MVS and their maximum distance is determined by the degree of heterogeneity of the field variations of the geomagnetic field in this area [2, 3]. Due to the lack of serial marine MAM method [1] is mainly used when shooting from the ice when the MVS use of ground magnetometers. The accuracy of these methods does not exceed 5-10 NT.

In the known methods [4, 5] variations of the geomagnetic field based on the gap analysis values ("residuals") of the geomagnetic field that occurs when shooting at the points of intersection of the ordinary and intercept lines (profiles). The accuracy of these methods is of the order of 10 NT and increases with the number of clipping.

Also known modification methods [4, 5], in which to control use data MVS located in relative proximity to the study area.

In the known method [7] analyzed the relations between the characteristics of geomagnetic variations on the surface of the Earth the parameters of the interplanetary medium and the magnetosphere controlling their sources. The error of such methods, techniques and potential, regression and spectral analysis of the data obtained through equipment installed at the Observatory, reach tens of nanotesla.

There are also known methods [8-10], which automatically take into account variations in the process of shooting. These methods are used directly to measure the variations of the geomagnetic field from a moving carrier. The essence of these methods is the simultaneous measurement of the field by two or more magnetic transducers mounted on the moving carriers spaced at known predetermined distance along the direction of motion, the subtraction of the received signals and the integration (summation) of the result, since the reference value of the geomagnetic field. Subtraction of the signals of the magnetometer transducers excludes from measurements of variation (homogeneous within base gradienter), and integrating the differential signal restores the value of the stationary geomagnetic field. To highlight variations restored field value is subtracted from directly measured.

The geomagnetic field (GMF), measured in motion, is a complex function of time T [x(t), y(t), z(t), t], the full derivative which equally is [11]:

wherethe velocity vector of the carrier.

In a first approximation, the measured values can be represented as a sum of stationary and variance components: T [x(t), y(t), z(t), t]≈Tc(x,y,z)+Tin(t).

Then when moving in the plane directionfrom (1) follows:

whence it is seen that while measuring full field T and the gradient of its stationary Twithyou can calculate the variation of Tinif you know the speed of the media. When discrete measurement value of the gradient (derivative) of the field in the direction ofon the basis of Δ on the i-step is calculated as:

integrating data is converted into a summation:

and the difference T(xn, t)-Tc(xn)=Tin(t) determines the variation.

In the General case, the total relative error of measurement of variations of this method δincan be expressed [11] through:

where Mandinstrumental error of the magnetometer;

δl- error due to variations database of measurements;

δin- error due to gradients of variation.

δν- error due to errors of the ship lag;

δand- error integrator;

And is the average amplitude of the measured variations of GMP;

n - number of cycles summation.

From the analysis of expression (5) shows that the sum of the data is the accumulation of errors, i.e. the possibilities of the method is limited by the number of cycles n, where σinwill not go beyond the specified values of σ3. In the measurement process when the accumulation of the error to σ3it is recommended [11] to begin a new cycle of integration from a new level. For example, when measuring in the sea in a cycle Δt=10 c and the total duration of integration is about 3 hours (n=103using rigidly mounted gradienter (δ=0) with Mandin=0,1 NT and considering the error integrator and velocity measurements small (δand≈δν≈0), the formula (5) can be estimated that the average amplitude of the variations A=100 NT mean square measurement error variation σ≤6%. In this way it is possible to take into account and measure the variations of the GMF with frequency f≤νx/Δx that when Δ=100 m and νx=10 knots. will match f≤0.05 Hz (Tin>20). With increasing speed and decreasing the spacing of the sensors frequency range considered variations increases, however, decreases the difference between the measured value of the GMF. So, at an average gradient magnitude of the GMF in the ocean 40 NT/km increment ΔT on the basis of 1-5 m accounted for whom it is 0.04 to 0.2 NT, that would require more accurate measurement of the GMF to ~10-3nTl. Currently, such sensitivity is possible in principle be obtained by using cryogenic and some types of quantum magnetometer transducers [12].

Thus, on the basis of gravitometric way it is possible to provide the measurement and calculation of geomagnetic variations in the movement with a relative error of about 5...10%, while the processing on the ship's computer system automatically takes into account the variation of the GMF, the frequency range which is determined by the length of the base dimension and the speed of the media.

The presence of dispersion errors (5) linear component, increasing in proportion to the number of dimensions is one of the major limitations of gravitometric way along the length of the transect (maximum period allocated variations). Use to reduce these errors data or the indirect method of accounting for variations or MVS data set at the ends of the tacks, proposed in [4, 9, 13], deprives gradientlike way its versatility.

A common disadvantage of known methods is the relatively low accuracy of the measurement of stationary variations of the geomagnetic field.

Improving the accuracy in the measurement of stationary variations of the geomagnetic field is achieved in swetnam method to determine the stationary geomagnetic field during marine magnetic survey, involving simultaneous measurement of variations of the geomagnetic field by two or more magnetic transducers mounted on the moving carriers spaced at a specified distance along the direction of motion, in which one magnetic Converter is further spaced vertically at a distance of 100-200 meters from the sea surface, with the possibility to move along the direction of movement of the first magnetic transducer, with its subsequent move across the direction of movement of the first magnetic transducer with speed exceeding the speed of the first magnetic transducer, at least one order of magnitude [15].

New features improve the accuracy of the variations in the known method [15] appear due to the use of at areal shooting is not the only research vessel, equipped with towed differential magnetometer (gradientbutton) and going along the route of the gals, but his regular helicopter, equipped with a more simple modular device. When this variations with a short period is provided directly according to the ship's gradienter, and to prevent its linear errors that accumulate during long-term measurements, using data from the reference route helicopter the Noah shooting. Using a significant advantage of the helicopter in speed, this route lay along the primary direction of motion of the vessel and terminate at the point end of the gals from which the helicopter performs ordinary routes (cross-reference), returning to the vessel carrier.

The selection of magnetotelluric component of the background noise is facilitated, if the interference on the electric and magnetic channels caused by the different sources are uncorrelated), for example when measuring electric and magnetic fields on different media. This is because the magnetic components of the natural electromagnetic fields (EMP) less than electric depend on the nature of the geoelectric section away from the horizontal inhomogeneities.

In [14] it is shown that up to 5% in mid-latitudes possible horizontal separation of electric and magnetic sensors on the value of Δr≤(0,013...0,025)r, where r is the distance from the project area to the projection of the source onto the surface of the Earth. While the spacing of the sensors vertically to a distance of 200 m has practically no influence on the measurement results.

Thus, for the purposes of magnetotelluric sounding (MTS) at sea in the middle latitudes it is possible to use simultaneous measurements of electric components EMP towed behind the vessel and the meter is (at relatively low speeds) and magnetic components (using component differential magnetometer, installed on another ship or on a low-flying helicopter or other aircraft (LA), remote to a distance of 50-100 km). In the auroral zone and near the magnetic equator the spacing measuring electric and magnetic component leads to large (up to 50%) errors of measurement of the impedance Zn[14]. Thus, in high and Equatorial latitudes holding MTZ at the surface is more appropriate at the location of the magnetometer and measuring electric fields on the same ship.

Minor magnetic inclination in low latitudes allows for the measurement of the horizontal component δn in motion instead of component gradienter modular, which is easily implemented. It is shown that the modular δT-Vario can be used as δn-Vario when determining impedance in the surface installation of the Tikhonov-Cagniard with a relative error no more than 20% in zone latitudes ±20% and less than 6% in the zone of ±15%.

It is known that when used as a display unit, measuring module full vector(for example, proton or quantum)actually registers the projection of the variation δT in the direction of the vectoras. In addition, in deep-water areas (depth h) the tug is the range of speeds ν T-magnetometer registers practically only the variable portion of the GMP at frequencies

It follows that in deep-water areas near the magnetic equator there is a possibility on the basis of simultaneous measurements using towed T-magnetometer and measuring the horizontal component of the electric field to assess the magnitude of the input impedance and to build the part of the curve MTW in the frequency range f1<f<f2whereis determined by the Nyquist theorem of minimal discrete measurements of Δt.

When MTZ at the surface, you must use the above methods to reduce hydrodynamic (first wave) interference. Note that the use of LA facilitates the reduction of the influence of hydrodynamic interference due to the high speed media. Furthermore, the magnetic fields of the waves on the flight altitudes LA damped by 2-3 orders of magnitude.

Installation on the AIRCRAFT (for example, on shipboard helicopter) magnetometer and measurements synchronously with the shipboard magnetometer-gradientbutton can significantly reduce the measurement error δT, caused by the accumulation of errors in the integration of (5).

The known method [15] is implemented as follows. By means of the measuring equipment installed on the ship and the helicopter is measured. In the data obtained through aeromagnetics, enter the correction for variations δT(t1) to the authorized ship gradienter, where. Since the linear part of the dispersion error of gradiententry σ according to (5) is proportional to the time t1when the level of the vessel point N at time tN=l/νcit will be taken into account according to the helicopter shooting with accuracy, i.e. the accumulation of errors is intimes slower. Thus, when such a complex helicopter-ship shooting at one loop for time tNtaking polygon of size l×L (wherewhere n is the ratio of the νinfor νck is the reciprocal of the value between the tack distances (density tacks), m is the distance between the tacks. Then the cycle of shooting can be repeated.

However, the conditions of the measurements onboard the aircraft less favorable than on the ship by force of circumstances, due to irregular long-period vertical and horizontal accelerations with a period of 30-100 or more, as well as the necessity of taking into account the speed and altitude of flight.

In this regard, in the design of instrumentation and measurement techniques should be taken into account specific features footage from the aircraft, including the determination of corrections for long-period vertical speeded up who I am. Determination of the amendments should be carried out by a method that depends neither on inertial forces, or the force of gravity, otherwise the amendment will contain error due to changes in the value of g on the route. Use for this purpose barometric meter vertical speed of the aircraft, with low accuracy, does not always lead to the desired results.

The objective of the proposed technical solution is to improve the accuracy in the measurement of stationary variations of the geomagnetic field.

This objective is achieved in that in the method of determining the stationary geomagnetic field during marine magnetic survey, involving simultaneous measurement of variations of the geomagnetic field by two or more magnetic transducers mounted on the moving carriers spaced at a specified distance along the direction of motion, in which one magnetic Converter is further spaced vertically at a distance of 100-200 meters from the sea surface, which can move along the direction of movement of the first magnetic transducer with its subsequent move across the direction of movement of the first magnetic transducer with speed exceeding the speed of the first magnetometric the nd Converter, at least on the order introduced by another magnetic transducer placed in the thickness of the marine environment on the media, representing a self-propelled remotely operated vehicle equipped with the navigation and sonar measuring means and communication, additionally measure the inclination of the magnetic field vector, which determines the ratio of the components of the gravitational field Vzzand Vzxwhile the second additional magnetic transducer is installed with the possibility of moving along the direction of movement of the first magnetic transducer, with its subsequent move across the direction of movement of the first magnetic transducer with speed above or below the speed of the first magnetic transducer, at least one order of magnitude.

On aircraft installed proton magnetometer type ELSEG or aeromagnetic gradientometry system type HAGS (depending on the class of aircraft.

On Board is installed proton magnetometer type G-8, compatible with the ship's navigation and stabilization system of the vessel. On self-propelled controlled underwater device is equipped with a magnetometer-gradientunits GSM type. The choice of this meter because the measurement vector in the products of the geomagnetic field (GMF) is a major obstacle to obtaining reliable information about the spatial distribution of the GMF are its temporal variations, most strongly manifested in the high latitudes. Automatic exclusion of the influence of variations in the process of shooting is achieved when using magnetometers-gradients, which consist of two measuring systems: magnetometer for measuring the differential signal from the two sensors and the spatial - measure values of the difference of depths in the direction of motion of self-propelled controlled underwater vehicle, while the relative error of measured values will be equal.

As is well known (see, for example, gravity survey. / Handbook of Geophysics edited Eaadev, Keisala. - M.: Nedra, 1990, - 606 S.; Magnetic survey. / Handbook of Geophysics edited Vainikolo, Ushibuka. - M.: Nedra, 1990 - 470 C.), the gravitational field and the anomalous magnetic field of the Earth are potential and have the following common properties:

is described by Poisson's equation;

- the relationship between magnetic and gravitational potentials for homogeneous masses are described by the Poisson formula;

- magnetic and gravitational potentials when measuring out-of-field sources are described by the Laplace equation;

analytical model dependencies homogeneous sources in the form of a sphere or a circular cylinder selected for calculating the acceleration of gravity and the components of the geomagnetic field is opadaut with accuracy up to constant factors.

The communication parameters of the magnetic and gravitational fields is confirmed in practice (see, for example, Wenliheuna, Avecin, Eveloppement. Comparison of anomalous geophysical fields and their interpretation. / Geomagnetism and aeropole, 1999, t, No. 2, p.137-140) on the basis of comparison of their autocorrelation functions (table), where:

Model basedMagnetic fieldThe gravitational field
(vector)(vector)
Assessment of the potential field sourceΔU=-ρΔ(V)ρ=4πP(ρ)
Capacity assessment without the source fieldΔU=0Δ(V)ρ=0
The equation for a sphere with constant densityH=-ξMξx/(x22)5/2Vxz=-3Gξx/(x22)5/2
Z=M(2ξ2-x2)/(x22)5/2Vxz=Gm(2ξ2-x2)/(x22)5/2
The equation for the cylinder H=-2M2ξx(x22)2Vxz=-4Gλξx/(x22)2
Z=2Mξ2-x2/(x22)2Vxz=Gλ(ξ2-x2)/(x22)2
The communication parameters of the gravitational and magnetic fields for models of the sphere and cylinderNSH=VxzM/GmSC=VxzM/Gλ,
Z=VzzMGmZ=VzzMGλ
The communication parameters of the gravitational and magnetic fields through the Poisson equationXs=(JxVxx+JyVxy+JzVxz)
Ys=(JyVxy+JyVyy+JzVyz)
Zs=(JxVxz+JyVyz+JzVzz)
U, V is the scalar potential of the magnetic and gravitational fields;
H, Z is the horizontal and vertical components of the magnetic field vector;
G is the constant of gravitation;
X, ξ is the position of a point in a planar coordinate system;
M, m - magnetic and gravitational mass;
P(ρ) - determination of density of gravitating masses;
λ is the effective mass per unit length;
J, Jx, Jy, Jz - intensity (intensity) of magnetization and its components;
Xs, Ys, Zs - results of measurements of the magnetic field on the ship.

Expression from the fourth row of the table is:.

To determine the spatial vector of the gravitational field introduced a similar angle gravitational inclination θ. Then, in accordance with expressions (lines 4 and 5 of the table), it follows that for an arbitrary sphere (cylinder) analytical dependence of the magnetic and gravitational inclination in the same coordinate system coincides, i.e

.

From formulas (6) and (7) it follows that tgθ=tgJ.

Therefore, the results of the measurements of the inclination of the magnetic field vector may be determined by the ratio of the components of the gravitational field Vzz and Vzx.

The common analytical dependencies describe the geomagnetic and gravitational fields with precision constant is observed for spherical and cylindrical objects. For complex geometries match the analytical dependency is not observed. However, practical measurements of magnetic and gr is vitational fields show what model of the ball and cylinder at distances far from the source (approximately at a distance greater than the size of source), and applicable to the real sources with negligible error.

Implementation of technical difficulties does not represent, as for its implementation can be used for serial measurement and processing of the received information.

Sources of information

1. Statement on marine magnetic surveying (IM-86) / the USSR Ministry of defense, P., 1987. - P. 22-26, 50-54, 96-103.

2. PR YU, Stavrov KG Temporal variations of the geomagnetic field. / Topic monograph, "Accounting for temporal variations during marine magnetic survey". M: IZMIRAN, 1984. - P.3-18.

3. Magnetic survey: Handbook of Geophysics. Ed. Vainikolo, Ushibuka. - M.: Nedra, 1990. - S, 179-188, 216-220.

4. Gordin V.M., rose E., Angles D. Marine magnetometry. - M.: Nedra, 1986, p.58-71, 97-103.

5. Stavrov KG, Palamarchuk VK, Demin BN. Complex method of accounting for variations in marine magnetic survey in the interests of navigation. // Abstracts of the First Russian scientific-technical conference "Modern condition, problems of sea and air navigation. - SPb.: "Shipbuilding", 1992. 174 C.

6. Stavrov KG, Demin B.N., Palamarchuk VK, Filebox NN. Technology of different height magnetic surveys in the search for and development of oil and gas fields n the continental shelf of the Arctic seas. / The proceedings of the First International conference on the shelf of the Arctic seas of Russia". - M.: 1994. - S-132.

7. Stavrov KG ABOUT creating an automated system security alerts about dangerous Helio-geophysical perturbations on the waters of the World ocean. / Proceedings of the 4th all-Russian scientific-technical conference "Modern condition, problems of navigation and Oceanography" ("BUT-2001"), Vol.2., SPb.: Ningi, 2001. - S C.

8. USSR author's certificate No. 739454.

9. Rose E.N., Markov IM Gradientlike method of measuring the geomagnetic field in the ocean. // Take into account temporal variations during marine magnetic survey. - M.: IZMIRAN, 1984. - P.194-224.

10. Semevsky RB and other Special magnetometry. - SPb.: Science, 2002. - 228 S.

11. Semevsky RB, Chernobrov H., Poddubny A.I. Measurement of variations of the geomagnetic field in motion. // Geophysical equipment. 1977. - VIP. - P.46-50.

12. Afanasiev YV.. Studentsov AV, Horev NR. and other Means of measurements of the magnetic field. - L.: Energy, 1979. S-139, 229-242.

13. Stavrov KG, Burtsev Y.A., Palamarchuk VK and other Assessment of variations in the geomagnetic field according to the results gradientometry hydromagnetic filming. / Methods and tools for studies of the structure of the geomagnetic field. M: IZMIRAN, 1987.

14. Eve CENTURIES the Foundations of theory of natural electromagnetic fields in the sea. - L.: Guide Meteosat, 1979. - P.140-155, 162 to 165.

15. Patent RU No. 2331090.

The method of determining the stationary geomagnetic field during marine magnetic survey, involving simultaneous measurement of variations of the geomagnetic field by two or more magnetic transducers mounted on carriers spaced by a given distance along the direction of movement of carriers, in which one magnetic Converter is further spaced vertically at a distance of 100-200 m from the sea surface, which can move along the direction of movement of the first magnetic transducer, with its subsequent move across the direction of movement of the first magnetic transducer with speed exceeding the speed of the first magnetic transducer, at least one order of magnitude, characterized in that the introduced another magnetic transducer posted in the thickness of the marine environment on the media, representing a self-propelled remotely operated vehicle equipped with the navigation and sonar measuring means and communication, additionally measure the inclination of the magnetic field vector, which determines the ratio of the components of the gravitational field Vzzand Vzxwhile the second additional magnetometer of Preobrazovatel is installed with the possibility of moving along the direction of movement of the first magnetic transducer with its subsequent move across the direction of movement of the first magnetic transducer.



 

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4 dwg

FIELD: physics.

SUBSTANCE: disclosed method is characterised by that signals of a source of radio-frequency emissions from an environmental or natural disaster are received on five antennae. The received signals are undergo frequency conversion using frequency ωr1 of a first heterodyne. Voltage of the first intermediate frequency is picked up. When detecting a signal of a source of radio-frequency emissions from an environmental or natural disaster, tuning of the frequency ωr1 of the first heterodyne is stopped temporarily. Voltage of the first intermediate frequency of the measurement channel undergoes repeated frequency conversion using the stable frequency ωr2 of a second heterodyne. The main parametres of the detected signals are analysed and recorded. Voltage of the second intermediate frequency of the measurement channel is multiplied by the voltage of the first intermediate frequency of direction-finding channels. Phase-modulated voltage values are picked up at stable frequency ωr2 of the second heterodyne. Low frequency voltage values are picked up at frequency Ω of rotation of the helicopter rotor. The azimuth α and the angle of elevation β of the source of radio-frequency emissions from the environmental or natural disaster are measured.

EFFECT: broader functionalities of the method by detecting and determining coordinates of the source of radio-frequency emissions.

2 dwg, 1 tbl

FIELD: mining.

SUBSTANCE: method involves measurement on the carrier movement trajectory of values of the Earth's magnetic field induction vector (EMFIV) modulus and one of components of EMFIV modulus gradient, compensating of carrier magnetic disturbances against these measurements, processing the information about EMFIV modules for making a decision to detect local magnetic anomalies (LMA) and estimation of parametres of carrier contact with LMA - traverse coordinates and values of tilted traverse range, combined processing of modulus and modulus gradient component that allows to define coordinates and magnetic moment of LMA.

EFFECT: possibility to define all coordinates that characterise the location of local magnetic anomalies, LMA classification by value of its magnetic moment.

1 dwg

FIELD: physics.

SUBSTANCE: device has a synchroniser 1, transmitters 2.1-2.4, antenna switches 3.1-3.4, transceiving antennae 4.1-4.4, receivers 5.1-5.4, processing units 6.1-6.4, field of vision switch 7, strobe pulse generator 8, indicator 9, thermal image sensor 10, television sensor 11, receiving unit 12, receiving antenna 13, motor 14, reference generator 15, first heterodyne frequency synthesiser 16, first intermediate frequency amplifiers 18, 26-29, second heterodyne 19, mixers 17, 20, 22-25, second intermediate frequency amplifier 21, multipliers 30-33, 38, 40, narrow band-pass filters 34-37, 42, 44, delay lines 39, 41, phase detectors 43, 45, phase metres 46-49, correlator 50, controlled delay unit 51, multiplier 52, low-pass filter 53, optimal control 54, range indicator 55, recording and analysis unit 56. The transceiving antennae 4.1-4.4 are placed on ends of helicopter main rotor blades. The receiving antenna 13 is placed over the rotor head of the helicopter. The motor 14 is kinematically linked to the helicopter rotor and reference generator 15.

EFFECT: high accuracy of determining route of a main pipeline and distance to the pipeline.

1 tbl, 2 dwg

FIELD: physics; geophysics.

SUBSTANCE: invention relates to electrical prospecting on alternating current excited in the earth using an inductive method, and can be used in searching for and prospecting for conducting objects in non-conducting and conducting medium. Low-frequency electromagnetic field is excited using a vertical magnetic dipole moved on parallel profiles at a given height. The time and coordinates of the points where the dipole is located are recorded. Cartesian components of the electric field strength and magnetic induction are measured on the day surface of the earth at a fixed point. The measurement time is recorded. The corresponding time for measuring the field and the position of the dipole is used to determine coordinates of their relative position. Vector components of the electromagnetic field in a cylindrical coordinate system are found and their values are assigned to the points where the dipole is located. The value of their deviation from normal values for homogeneous medium is used to identify parts of the medium with high electrical conductivity.

EFFECT: high measurement accuracy during area survey.

5 dwg

FIELD: physics.

SUBSTANCE: proposed mechanism comprises butt for it to rest upon operator's body, and rod with its end accommodating search head secured thereto. Said mechanism incorporates scanning angle transducer built in cylindrical case coupled, on one side, with the rod and, on the other side, with aforesaid butt. Said butt is secured to moving part of aforesaid scanning angle transducer. Said rod is articulated with scanning angle transducer case.

EFFECT: possibility to determine search head position in scanning relative to operator.

8 cl, 1 dwg

FIELD: measurement equipment.

SUBSTANCE: invention is related to the field of aerial geological mapping. System comprises towing device with flexible bearing frame. Flexible bearing frame arranged at a distance from aircraft, includes section of transmitter with transmitter loop and section of receiver with detector combined with central axis of transmitter section. Flexible bearing frame has light modular structure, which makes it possible to increase and reduce area of transmitter section surface for achievement of certain survey objectives. Loop of transmitter sends pulse in interval "ON". In interval "OFF" sensor device receives response signal from earth. Differential amplifier joined to sensor device provides for high amplification during interval "OFF". Elements of system are connected to computer, on which control computer program is installed for control of system functions.

EFFECT: improved resolving capacity.

27 cl, 9 dwg

FIELD: electric engineering.

SUBSTANCE: invention relates to diagnostic devices; it can be used for systematic remote status control of gas pipe-lines and gas storage areas. Automatic unmanned diagnostic complex includes automatic control system, GPS satellites, navigation system, inertial navigation system, receiving equipment of navigation satellite system, real coordinates computer of navigation satellite system, radio beacon, system of air velocity signals, low-range radio altimeter, automatic remote control system, electronic guidance system, infological unit, receiving equipment of electronic guidance system, TV surveillance system, radiotelemetry system, system of automation onboard operation control for remotely controlled aircraft (RCA) with computer, engine control system, computer of automatic control system, radio relay, onboard system control unit, onboard information tank, landing and parachute deployment system, control unit for remote status control system of gas pipe-lines, electronic altimeter set, ground command facility, ground command console, launcher, rescue system and rudder. Radiotelemetry system contains two radio stations located at RCA and ground command facility respectively; each radio station includes high-frequency generator, source of discrete messages and commands, the first mixer, the first heterodyne oscillator, amplifier of the first intermediate frequency, the first power amplifier, duplexer, the second power amplifier, the second mixer, the second heterodyne oscillator, amplifier of the second intermediate frequency, multiplier, band-pass filter, phase detector, amplitude modulator, source of analogue messages and commands, amplitude limiter and synchronous demodulator.

EFFECT: invention is oriented to functionality extension of RCA by means of exchange of radiotelemetry and command data between RCA and ground command facility with use of discrete and analogue messages, two frequencies and composite signals with combined phase-shift keying and amplitude modulation at one carrier frequency.

6 dwg

FIELD: physics.

SUBSTANCE: method is realised using an electromagnetic field source (1113) which transmits current pulses (81, 82) with sharp edges to an immersed vertical transmitting antenna. The electromagnetic field generated by pulses (81, 82) is measured using at least one receiver (1109) fitted with a vertical receiving antenna (1111) immersed in water during a period of time in which there is no transmission of pulses to a transmitting antenna (1108) by the electromagnetic field source (1113). Distance between the electromagnetic field source (1113) and at least one receiver (1109) is less than the depth of the target object.

EFFECT: high accuracy.

12 cl, 14 dwg

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