RU2269794C2 - 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 use application 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 with a carrier frequency in the field of x-ray or y-radiation with the purpose of receiving responses from the targets not due to the induction of currents in conducting cover of the target or due to interference but due to scattering of x-ray beams on the electronic shells of the atoms or gamma-rays atomic nucleuses of the whole mass of the substance of the target(Compton's effect) and separation because of this of a response from the target with the help of a receiver in direct proportion to the quantity of the atoms in this target, their atomic number(for scattering of x-ray radiation) or the mass figure of the nucleus(for scattering of y-radiation). 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. The response will be at its maximum at filling the fighting equipment of the target with fissible material.

EFFECT: allows to separate a required object(objects)in the cloud of dipoles.

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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 the carrier frequency of the probe signal of the locator in the field of x-ray or gamma radiation, in order to obtain responses from the targets not by inducing currents in the conducting shell of the target or interference, but by scattering the x-rays by electron shells of atoms or gamma rays on the atomic nuclei of the entire mass of the target (Compton effect).

The technical result of the invention is to directly measure 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 an x-ray (gamma) locator with the allocation of a time-stable deterministic delay in the responses of the scattered signal from the target relative to the emitted signal is shown in the drawing. The numbers indicate:

1 - X-ray tube

2 - Radiometer-X-ray meter

3 - High-voltage pulse generator

4 - Amplifier

5 - Signal processing device (trace tie criterion: n of m, trace reset criterion: k passes)

6 - Threshold detection device τc≥Δt, where: τc is the path existence time, Δt is the criterial interval.

The targets are irradiated with short pulses of x-ray radiation, and the radiation energy corresponds to the voltage on the electrodes of the x-ray tube, for example RT-180M. The radiation directivity characteristic of x-ray tubes (4 ... 10 °) is sufficient for most applications. X-rays or gamma rays are scattered on the electron shells of atoms or on the atomic nuclei of the entire mass of the target (the Compton effect), while the wavelength of the scattered radiation varies in proportion to the scattering angle and has a maximum in the direction of backward radiation (see B.M. Yavorsky and A .A.Detlaf, Handbook of Physics, "Science", -M., 1965):

The scattering electron or nucleon (electron or nucleus of recoil) acquires a maximum of kinetic energy also in the direction of backscattering:

and can also be used to detect targets.

The scattered X-ray or γ-radiation, as well as the recoil electrons or nucleons, are received by a detector sensitive to both the X-ray and ionizing radiation of the recoil electrons (nucleons), for example SBM-20.

The amplitude of the received signal from any target will be directly proportional to the number of atoms in that target, their atomic number (for scattering x-ray radiation) or the mass number of the nucleus (for scattering γ-radiation). Obviously, passive interference made from frame fabric structures, thin aluminum wire or synthetic film, coated with a layer of aluminum weighing in units and fractions of a gram will give several orders of magnitude less response than a true target weighing several hundred kilograms, made mainly of steel. The response will be maximum when performing combat equipment targets from fissile materials.

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

Claims (1)

A method for locating targets 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 probe uses a probe signal with a carrier frequency in the region of x-ray or gamma radiation, and the receiver receives a response from the target due to the scattering of x-rays on the electron shells of atoms or gamma rays on the atomic nuclei of the entire mass of the target, the maximum amplitude of which is directly proportional to the number of atoms in this target, their atomic the number for the scattered x-ray radiation or the mass number of the nucleus for the scattered gamma radiation, as well as the measured massiveness of the target - detect the object.