RU2269793C2 - Mode of location of targets - Google Patents

Abstract

FIELD: the invention refers to modes of location of targets in a cloud of passive interference and may be used in locators.

SUBSTANCE: the achieved technical result of the invention is the separation of the required object (objects) in a cloud of dipoles without conducting processes of detection and identification of all targets in the cloud of a complex target. The indicated result is achieved by way of irradiating of the targets with a probing signal in the shape of an electron beam for obtaining responses from the targets due to generation in the substance mass of the target of breaking x-ray or gamma-radiation and separation of the response from the target with the help of a receiver in direct proportion to the quantity of the atoms in this target (in the limits of the depth of the run of β-electrons) and their atomic number. The passive interference is fulfilled out of frame cloth constructions, a thin aluminum wire or synthetic film covered with an aluminum layer with mass in units and quotas of a gram will give a response on several levels less than a true target with mass of several hundreds of kilograms fulfilled mainly out of steel.

EFFECT: higher efficiency.

1 dwg

Description

The invention relates to methods for locating targets in a cloud of passive interference and may find application in locators.

Known methods and devices for target location intended for use in radars - Method for distributed data association and multi-target tracking, US Patent No. 5138321, publication date: 08/11/1992; Radar target signature detector, US patent No. 5191343, publication date: 2.03.1993; Radar systems, UK patent No. GB 2265513, publication date: 09/29/1993.

As a prototype of the invention can be considered US patent No. 6300895, publication date: 9.10.2001, "Discreet radar detection method and system of implementation there of."

A common drawback of the proposed technical solutions is the need to detect and measure the parameters of all targets located in the area of the locator, after which it is supposed to isolate (select) the desired targets according to their measured parameters. For a relatively small total number of goals in the total volume of a complex goal, these solutions make it possible to achieve the desired result within the framework of existing and promising computing tools. When using a sufficiently large number of false targets, for example, dipole reflectors (5 ... 10 cassettes of 10 ⁶ ... 10 ⁸ dipoles in each, depending on the range of the locator), the use of the proposed technical solutions is unrealistic due to insufficient computing performance.

The essence of the proposed method for target location in a cloud of passive interference is based on the choice of an electron beam locator as a probe signal to obtain responses from targets not by inducing currents in the target’s conductive shell or interference, but by generating inhibitory x-ray or gamma radiation in the mass of the target material .

The technical result of the invention is a direct measurement of the massiveness of the target, which is physically impossible to reproduce for false purposes, which means that the proposed location method allows you to select the true target in the cloud of passive interference, without carrying out the detection and recognition of all targets in the cloud of a complex target.

Information confirming the possibility of carrying out the invention:

An example embodiment of the invention in the form of a block diagram of a locator with the allocation of a time-stable deterministic delay in the response of the bremsstrahlung signal of the target relative to the emitted β-electron signal is shown in the drawing. The numbers indicate:

1 - electron gun;

2 - radiometer-radiometer;

3 - source of accelerating voltage;

4 - probe pulse generator;

5 - amplifier;

6 - signal processing device (criteria for tying traces: n of m, criterion for resetting traces: k passes);

7 - τ _q ≥Δt threshold detection device, where: τ _c - the lifetime of the route, Δt - criterial interval.

The targets are irradiated with short pulses of β-radiation, and the radiation energy corresponds to the accelerating voltage at the electrodes of the electron gun. The directivity of the radiation is determined by the focusing and deflecting systems of the gun, similar to guns in cathode ray tubes.

The bremsstrahlung signals from targets are received by a detector sensitive to x-ray and gamma radiation, for example SBM-20, while the bremsstrahlung spectrum is continuous and the maximum bremsstrahlung frequency is determined by the energy (speed) of β-electrons (see B.M. Yavorsky and A.A. Detlaf, Handbook of Physics, M., Science, 1965):

where ν is the initial velocity of electrons, m _e is its mass, h is Planck's constant.

The output of bremsstrahlung Y _β [MeV] upon braking of one electron (β-particle) for a monoenergetic beam will be (see V.F. Kozlov. Radiation Safety Handbook, M., Energoatomizdat, 1987):

Y _β = 10 ^-4 · c · Z · E ^b ,

where c = 3 ... 3,5 is the proportionality coefficient (equal to 3 - for Z≥70, 3,5 - for Z≤4); b - coefficient of proportionality (equal to 1.9 - for Z≥70, 2.3 - for Z≤4); Z is the atomic number of the substance; E is the electron energy, MeV.

Due to the fact that the output of the bremsstrahlung, and hence the amplitude of the received signal from the target, is directly proportional to the number of atoms in this target (within the range of β-electrons) and their atomic number, it is obvious that passive interference made from frame fabric structures a thin aluminum wire or synthetic film coated with a layer of aluminum with a total mass of units and fractions of a gram will give several orders of magnitude less response than a true target weighing several hundred kilograms, made mainly from hoists.

The processing scheme for detecting a target and constructing a route for its movement is no different from traditional locator schemes.

Claims (1)

A method for locating targets for detecting objects in a cloud of passive interference for use in locators, based on measuring and analyzing parameters of signals reflected from targets, characterized in that the probing signal in the form of a beam of β electrons is used in the locator, and the receiver receives the response from the target obtained for account of the generation in the mass of the substance of the target of X-ray or gamma radiation with a continuous spectrum and a maximum frequency of bremsstrahlung, determined by the energy of β-electrons, according to the level of the amplitude of the received response from the target, directly proportional to the number of atoms in this target, within the range of β electrons and their atomic number, as well as the measured mass of the target, an object is detected.