SU1347065A1 - Device for airborne electric prospecting - Google Patents

Abstract

The invention relates to geophysics and can be used to measure the electrical properties of the underlying surface using aircraft. The purpose of the invention is to increase the accuracy of determining the electrical properties of the surface of the Earth. The device contains a measuring unit located on the aircraft, and two electric antennas. The antennas are located one below the other below the aircraft on an axis passing through the center of mass of the aircraft. 1 il. from 4 05 SP

Description

The invention relates to geophysics and can be used to measure the electrical properties of the underlying surface using aircraft.

The aim of the invention is to improve the accuracy of determining the electrically properties of the earth’s surface,

The drawing shows the proposed device.

The device consists of an aircraft with a registration unit 1 and an antenna system of two antennas 2 and 3.

The vertical electrical component of the electromagnetic field depends on the reduced surface impedance, which characterizes the electrical properties of the underlying surface.

Expressions (2) and (3) differ in the values of the electric field strength) or E, (h,), which are further used to determine the characteristics of the underlying surface. Since the values of) and E (L ^) are close, can be used. Any of these formulas. Then, the reduced surface impedance is determined as follows;

C, p)

, - / 2

(four)

..

-1 / g

jk

(five)

- j

2

(one)

Where

k with.

.a (At „41Г 10 Гн / м 6,8,85

e

voltage of the vertical component of the electrical IIOJTH; constant propagation of radio waves in the air; 30 circular oscillation frequency;

magnetic constant in the SI system;

An aircraft with a registration unit on board and an antenna system on the external suspension flies along the chosen course. In this case, the flying apparatus located on the axis of the antenna system does not affect the registration signals, since the dipole is located at the zero sensitivity point of the radiation pattern. During the flight process with the help of the register block

electric constants are measured vertical values in the SI system; component of the electric field.,) and

r rt

2

Value (

E9

complex relative dielectric constant of the underlying surface.

) represents

is the superficial impedance, i.e. parameter characterizing the electrical properties of the underlying surface.

Measuring the intensity of the vertical component of the electric field at a height of h, -,) and h - E (hj), the expression (1) can be written as I

Eaih.) - E (h,) h, - h,

E „(H,); (2)

) and by formulas (4) or (5) the characteristics of the underlying surface are calculated. And used

, 10, only the vertical component of the electric field, and other components depending on the direction of the radio station, are not used. In the process of one flight, you can make

45 construction of receiving equipment at different frequencies at which the other stations operate, and to make multi-frequency measurements. By measuring the vertical component of the electric

gQ floor at different heights above the surface and at different frequencies it is always possible to unambiguously determine its properties.

E (h,) - E (h) h, - h,

 T

FIR,). (3)

30 where L hj - h I.

The electrical properties of the underlying surface are measured as follows.

The aircraft with the registration unit on board and the antenna system on the external suspension flies according to the chosen course. In this case, the aircraft located on the axis of the antenna system does not affect the registration signals, since the dipole is located at the point of zero sensitivity of the radiation pattern. During the flight with the registrar registrar unit,

2

) and by formulas (4) or (5), the characteristics of the underlying surface are calculated. And used

only the vertical component of the electric field, and other components depending on the direction of the radio station, are not used. In the course of a single flight, it is possible to reorganize the receiving equipment to different frequencies at which other stations operate, and to make multi-frequency measurements. By measuring the vertical component of the electric

a floor at different heights above the surface and at different frequencies, it is always possible to unambiguously determine its properties.

55

Thus, the proposed device allows for one flight to carry out multi-frequency measurements on signals from various transmitters, which gives a significant economic effect.

by reducing the time of flight vehicles.

el yu che an ni no le

Claims (1)

Invention Formula An aeroelectromagnetic device containing a measuring unit placed on an aircraft and two Electrical antennas, characterized in that, in order to improve the accuracy of determining the electrical properties of the Earth's surface, both antennas are located one below the other below the aircraft rta of a single axis passing through the center of mass of the aircraft. fz (g) f g (g) /////////////// 7 ///// /////////////// Editor O. Golovach Compiled by E. Polkov Tehred I. Popovich Proofreader I. Muska Order 5119/46 Circulation 729 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4