RU2691982C1 - Design of multifunctional radar screening system - Google Patents

Abstract

FIELD: security systems.SUBSTANCE: invention relates to design of inspection frames intended for detection of explosive substances and other prohibited objects on human body in places of large accumulation of people in airports, sea and river stations, theaters, stadiums etc. places based on short-range radar ranging. Technical result is achieved by optimal arrangement on the frame of transmitting and receiving antennae, selecting the required number thereof to create an antenna field aperture, which enables to detect different types of prohibited objects by using properties of a linear MIMO system (Multiple Input – Multiple Output).EFFECT: detection of different types of forbidden objects with minimum size and weight characteristics of the inspection system.1 cl, 2 dwg

Description

The invention relates to the design of the inspection frames intended for the detection of explosives (EXPLOSIVES) and other prohibited items on the body in large crowded places at airports, sea and river stations, theaters, stadiums and other places based on short-range radar.

Almost all inspection stationary constructions are made in the form of a U-shaped frame through which a person passes, and all electronic components of the inspection are located around the perimeter of the frame, one may say, “smeared”, i.e. The constructs are not compact and their dimensions are on average two meters in height, one and a half meters in width and half a meter in depth. Due to these dimensions it is rather difficult to disguise them. One-sided inspection frames are rarely found, but due to their technical solutions (the use of several transformer coils) is still quite large.

The common problem of creating an inspection framework is the following:

• the frame should be invisible, i.e. passengers, fans, etc. should not notice it (they can only guess about the existence of such);

• the frame must be harmless to the health of those being checked not only from the point of view of the application of active waves, but must also not have toxic materials;

• the frame must have dimensions that are sufficient for the free passage of a person and a group of people;

• the frame should have a minimum cost and high manufacturability and manufacturing.

• the frame must have a maximum resolution;

• the frame must recognize the most “promising” explosives, the so-called liquid explosives (binary action).

Separately, we note that at present, the inspection framework scanners are performed individually for each type of prohibited item:

- magnetic materials, for example, iron: pistols, knives, brass knuckles, etc .;

- non-magnetic materials;

- dielectrics: plastic, plastic (flyers);

- explosives;

- drugs, etc.

Those. The inspection frame, through which mono detect prohibited items from different materials does not exist.

A device for screening equipment is known, which in real time allows you to remotely recognize various objects on the human body, including non-metallic and hermetically packed. The main application of the device is the control of items prohibited for transportation (carrying) to ensure the safety of people and the protection of property “Hand-Scanner I-SCAN FM” E-mail: info@iscnasyetems.ru.

For all its merits, the scanner has the following disadvantages: manual inspection (takes a long time), as well as incomplete accuracy, since He misses some parts of the human body, and most importantly - the inability to search in places of large concentrations of people: airports, stadiums, etc., when more efficiency is needed.

Inspection methods are known, see, for example, RF patent No. 2639003 of December 21, 2017, RF patent No. 2294549 of February 27, 2007. The methods are based on classical frames and materials with two or more channels of active waves and receivers, respectively.

Disadvantages:

- resolution is obviously insufficient due to the structure itself, which is made at the level of the end of the twentieth century;

- in passing, we note that the very idea of detecting explosives by electrical conduction of explosives does not hold water, since the mass of detectable explosives lies in the range of 1.8 - 2.2 kg. And if less? One person bears 1.0 kg, the second - 1.0 kg, the third - 1.0 kg, etc. What is the result? Clear;

- detects only explosives of the most common types of trinitrotoluene;

- detects only explosives, and does not detect other prohibited items, for example, drugs.

The patent of the Russian Federation No. 2633420 dated 06/26/2017 is known, in which a system of isolating a person with explosives from the surrounding space is applied in case of detection of explosives due to the use of an inspection frame of the classical type (on electrical conductivity) and a very expensive design.

The disadvantages are the same as in the previous two patents.

The application of the design of the proposed technical solution in well-known sources by the authors not found.

An object of the invention is to create a functionally complete construct that meets the incorporated high technical characteristics of a MIMO system while minimizing overall mass characteristics and is able to detect various types of prohibited items.

The technical result is achieved due to optimal placement of transmitting and receiving antennas on the frame, as well as choosing the necessary number of them to create such an effective aperture of the antenna field, which allows you to unconditionally solve the set technical problems by more fully using the high qualities of a linear MIMO system (this is Multiple Input - Multiple Output, multiple input - multiple output).

To solve this task, a design of a radar inspection system is proposed, characterized by the fact that it contains one or more carrier frames made in the form of flat panels that form antenna arrays, on the front side of which N-transmitting radiators are placed, with N at least one, and m- receiving antennas, moreover, m> = N, an electronic board is placed on the back side of the panel or on the side, the design also contains the screening monitors with storage devices by the number of frames located at the screening point itself radiotransparent bezel frame closed, the connections are made Mezhuyev said blocks shielded wire; the design can be made in two or more panels for expanding the functionality: each radiating and receiving element of the antenna array is preferably made in the form of a small-sized spiral antenna, but other small-sized elements are also possible.

Figure 1 shows the overall design and the relative position of the parts of the inspection frame (front and side view), but without detail.

Figure 2 shows a possible view of the emitter (receiver) of the MIMO antenna array.

Figure 1 marked the following notation:

1 - inspection frame with antenna array;

2 - radio transparent false panel;

3 - wall;

4 - gender;

5 - ceiling;

6 - electronics unit;

7 - single emitters;

8 - single receivers;

9 - holes for fastening the frame;

α is the opening angle of the radiation pattern of the aperture of the antenna array.

The fastening of the frame 1 to the wall is conventionally not shown, nor is the conventionally shown view of the false panel and its attachment to the floor and ceiling, since This is a trivial task.

The design has the following elements and their connections: on frame 1 there is an antenna array, in front of the frame there is a false panel covering the frame and made according to the texture and color of the surrounding interior.

On frame 1 on the sides there are radiators and receivers of the antenna array (transmitters-radiators and receivers of the same design according to the principle of antenna reversibility).

Behind frame 1 there is an electronics unit 6, which controls the entire work of the inspection frame, and it also transmits all the data of the inspection in real time to the monitor of the inspection operator (conventionally not shown).

At the same time, all inspection images are recorded in the memory for further viewing if necessary.

A design is proposed based on the principle of an ultra-wideband synthetic aperture radar (MIMO), which allows to obtain a radio holographic synthesis of 3D images, i.e. A radar “portrait” of foreign inclusions is compiled from the radar contrast, and the entire outline of the person being searched for and the foreign objects on his body and inside are shown in a color scheme.

This allows you to get high resolution, high angular resolution due to the synthesis of the aperture using small antennas as part of MIMO.

So With this construct, you can see any objects on the human body (or in the baggage), even with very small dimensions up to 1 mm (in metal) and low reflectivity (for example, a drug in the stomach).

It is possible to place emitters and receivers in the frame area and in another pattern, but in any case the number of emitters is equal to the number of receivers or the number of receivers is greater than the number of emitters, and the minimum number of emitters is equal to one, and there are two receivers.

Possible frame placement options:

- with the frame tilted at an angle downward (the frame is located closer to the ceiling);

- with an inclination of the frame at an angle upwards (the frame is located closer to the floor);

- with a changeable angle of inclination mechanically from a stepper electric motor according to operator commands (the frame is located in the middle);

- with automatic change of the angle of inclination from the stepper motor according to a special program entered into the processor.

It is possible to use a frame (antenna array) in the form of a curvilinear surface, for example, of the second order, relative to either along the vertical axis of symmetry or along the horizontal axis of symmetry to increase the resolution of the antenna array, moreover, with a concave curve, the frame is located in the direction of the radiation pattern (DN) .

The proposed design and its technical solution fully comply with the main economic criterion of “cost - efficiency”.

Claims (2)

1. The design of a multifunctional radar inspection system, characterized in that it contains an inspection carrier frame, made in the form of a flat panel, forming an antenna array, on the front side of which are placed N - transmitting emitters and m - receiving antennas, and m≥N, on the back side panel or side mounted electronic unit, the design also contains an inspection monitor with a memory device located at the inspection point, while the electronic unit provides a radar control of the radar “portrait” of foreign inclusions in the inspected person, and is also intended to control the operation of the inspection frame and to transmit live inspection data to the monitor of the inspection operator, the frame itself is covered with a radio-transparent false panel, the design is made in two or more panel versions, each radiating and receiving element of the antenna array, made in the form of a compact spiral antenna. 2. The construction according to claim 1 is placed on the side surfaces of the passage with a radiation pattern perpendicular to the carrier wall and / or at certain angles of inclination, each frame of the structure being placed at its specific angle, and the angles of inclination of the framework can be changed mechanically from the initial setting by certain degrees operator team.

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