RU2741828C1 - Method for detecting intruder, recognizing type thereof and direction of movement using double-beam passive infrared detection means - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: invention relates to security monitoring methods and can be used in applications of double-beam passive infrared detection means (DM) for signalling control of road network. Method consists in control of X-shaped intersection of roads (XIR) of DM; installing two of the three DMs diagonally from the XIR opposing inner sides and orienting such that the optical axes of their detection zones (DZ) cross two roads; installation for each of three DMs of the minimum allowable distance to the far from it road, at which the DZ of the person and the vehicle of the DM has crossed only the road nearest to it, and vehicle DZ only crossed only long-distance road; installation of the third DM on the XIR outer side and orientation so, that its human and vehicle DZ crossed on the road with the vehicle only one DM, and DZ of vehicle only intersected on other road with DZ of person and vehicle of remaining DM; detection of an intruder and determination of its side of motion relative to the XIR centre when it crosses the DZ; providing recording by a system for collecting and processing information (SCPI) of signals from the DM; establishing maximum time for accumulating SCPI of signals from the DM from the moment of arrival of the first alarm signal based on the minimum possible speed of the person on the road and the distance travelled by the person between the DM DZ; using an intruder type identification algorithm based on the number of alarm signals received for a specified maximum accumulation time of signals: one or two alarm signals - PN, three signals - NA; recognition by the algorithm of the violator's direction of movement in the direction of the alarm signals transmission to the intruder of motion relative to the XIR centre. Method includes a preparatory stage with unfolding according to the developed scheme of the DM at the XIR and the main stage, which starts with the arrival of the alarm signal and ends with forming an output on the type of the detected intruder: PN or NA and direction of its movement.

EFFECT: technical result consists in obtaining the possibility of detecting the type of intruder - PN or NA with low probability of error and using only three DM.

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Description

The invention relates to methods of security monitoring of the area and can be used in cases of using two-beam passive infrared detection means for signaling control of the road network.

As a rule, the offender's route on the terrain follows the existing network of paths and roads. It is important for the response forces not only to detect the intruder and determine the direction of his movement, but also his type (on foot or by car), which makes it possible to correctly assess the purpose and nature of the intruder's subsequent actions, and thereby select the most effective actions to find and arrest him. [one]

For signaling cover of the network of paths and roads, passive infrared detection means (CO) with a two-beam detection zone (ZO) are widely used. Analysis of CRMs used for the protection of terrain, foreign production ("Rembass", "Rembass 2" - USA, CLASSIC - Great Britain, etc.) and domestic (RS-IK - “Polyus-ST”, Radiy BRK-IK - “Umirs” , Mongoose - "Steelsoft", etc.) shows that they use a typical pyroelectric converter consisting of two differentially connected half-segments (DUAL), the geometrical dimensions of the ZO and the main characteristics of these means have values close to each other (Fig. 1). [2-6] The most informative of them ("Rembass", "Rembass 2" - USA, CLASSIC - Great Britain, etc.) determine the side of intersection of the two-beam ZO according to the order of arrival of bipolar impulses of the useful signal (positive, negative or negative, positive). [2] At the same time, there are no two-beam COs that determine the type of intruder - on foot or by car. The known method of recognizing the type of intruder by infrared detection means, but it requires software upgrades already produced by the industry CO. [7] One of the most common elements of the road network is the X-shaped intersection. [8]

A known method of detecting an intruder recognizing his type and direction of movement using passive infrared detection means, which consists in monitoring the X-shaped intersection of roads by means of 1 detection and means 2 of detection, means 3 of detection, means 4 of detection, installed on opposite sides of diverging roads so, that the ZO of each of them crossed only one road; detection by means 1 (2, 3, 4) of detecting an intruder when he crosses his detection zone and determining the side of the intruder's movement: to the center of an X-shaped intersection of roads or from the center of an X-shaped intersection of roads; ensuring registration by the system 5 for collecting and processing information signals from means 1 (2, 3, 4) detection; calculating the time interval between them and the average speed of the offender; recognition by the system 3 for collecting and processing information of the type of intruder by the speed of his movement: up to 5 m / s - intruder 4 on foot, over 5 m / s - intruder 5 in a car; in the application in the system 5 of collecting and processing information of the algorithm for recognizing the direction of movement of the detected intruder by the number of the detection means that issued the alarm and the indicated side of the intruder's movement relative to the center of the X-shaped intersection of roads (Fig. 2). [9]

One of the disadvantages of the considered method is the high probability of error in recognizing the type of intruder due to a possible delay in the arrival of signals from the CO to the SSOI and the overlap of two speed ranges (a foot intruder can move at a speed of more than 5 m / s, and a car at a speed below 5 m / from). [10] Moreover, the lower the passability of roads (paths), the greater the overlap of speed ranges and the higher the probability of error. Another disadvantage of the known method is the use of four expensive COs. Thus, the market value of COs used to protect areas of the terrain and included in mobile signaling systems reaches one hundred thousand rubles.

The aim of the invention is to obtain the possibility of recognizing the type of intruder - a walking intruder or an intruder in a car, the direction of his movement with a low probability of error and using only three COs.

To achieve this goal, a method has been developed for detecting an intruder, recognizing his type and direction of movement using two-beam passive infrared detection means, which consists in monitoring an X-shaped intersection of CO roads; setting two of the three COs diagonally from opposite inner sides of the X -shaped intersection of roads and orienting so that the optical axes of their detection zones (30) intersect two roads; setting for each of the three COs the minimum permissible distance to the road farthest from it, at which the CO of the person and the CO car crossed only the road closest to it, and the CO of only the car crossed the near and distant roads; installation of the third CO from the outer side of the X-shaped intersection of roads and orienting so that its CO of a person and a car intersects on the road with a CO of only a car of one CO, and CO of only a car intersects on another road with the CO of a person and a car of the remaining CO; detecting the offender's CO and determining his side of movement relative to the center of the X-shaped intersection of roads when he crosses the OZ in providing registration by the system of collection and processing of information (SSOI) signals from CO; establishing the maximum accumulation time of the SSOI signals from the CO from the moment the first alarm signal arrives, based on the minimum possible speed of a person on the road and the distance traveled between the CO CO; the use of an algorithm that recognizes the type of intruder by the number of alarms received during the specified maximum accumulation time of signals: one or two alarms - PN, three signals - HA; recognition by the algorithm of the direction of movement of the intruder according to the sequence of transmission of alarm signals CO and the sides of the movement of the offender indicated by them relative to the center of the X-shaped intersection of roads (Fig. 3, 4).

It is known that the length of the RZ of a human CO is at least half that of a car. [2, 3] A significant difference in the length of the ZO is explained by the fact that the geometric dimensions of the car (length from 2 m) are comparable to the dimensions of the cone-shaped ZO at its end (from 3 m), while the dimensions of a person (the width of the silhouette is 0.3-0.4 m ) in the same place is an order of magnitude less. The temperature of a car (engine, chassis) is significantly higher than that of a person. It is known that the larger the size of the ZO, simultaneously covered by the object, and the greater the difference between the temperatures of the object and the background, the higher the amplitude of the useful signal. [3] These differences between a car and a person explain the difference in the amplitudes of the useful signal (from the car, the signal amplitude is much higher, all other things being equal), which means that a car can be detected by CO at a much greater distance than a person.

When installing CO, it is necessary to set the minimum permissible distance from CO to the road farthest from it (S _MIN ). This minimum distance should be greater than the length of the person's RR but less than the length of the car's RR (Fig. 3). Then, when driving on any of the diverging roads, the intruder in a car will be detected by both COs, and when walking on foot, only by one CO (by the one that is closer to the road along which the walking intruder is moving).

The minimum permissible distance from the CO to the road farthest from it must be taken taking into account the elimination of errors in the conclusion about the type of detected intruder, when a person can be accidentally detected by the CO at a distance exceeding the one declared by the manufacturer (Fig. 3):

where S _MIN is the minimum distance from the detection device to the road farthest from it, m;

L _AUTO ^_ maximum length of the vehicle detection area, m;

L _PERSON - maximum length of the person detection zone, m.

As a rule, for a two-beam CO, the maximum length of the CO for a person is up to 50 m, for a car - up to 100 m. [2, 4-6] With such characteristics, the minimum distance from the CO to the road farthest from it (S _MIN ) will be 75 m (see. formula 1).

Crossing a section of terrain, an intruder strives to overcome it in the shortest possible time, therefore he moves in a through direction, i.e. leading direction from the starting line to the final line.

In the proposed deployment scheme, the intruder, moving in any end-to-end direction, crosses the axis of the detection zones three times, while the ZO of only the car from one to two times (Fig. 3). Therefore, the algorithm used in the SSOI recognizes the type of the intruder by the following data received from the CO (Fig. 4):

- if three alarms are received during the set maximum time of signal accumulation, then the type of the intruder is HA;

- if two or one alarm signal is received during the set maximum time of signal accumulation - PN.

An additional analysis of the combinations of the sequence of transmission of alarm signals from the CO and the sides of the offender's movement indicated by them relative to the center of the X-shaped intersection of the roads makes it possible to determine the side of the offender's movement (Fig. 4).

The maximum accumulation time of signals from CO from the moment of the first alarm signal (T) is set to exclude errors in the conclusion about the type of detected object in the SSOI. The maximum accumulation time of signals from the CO is determined on the basis of the minimum possible speed of a person on the road and the maximum distance between the optical axes of the ZO traversed by the intruder, and is taken from a safety factor of 1.2:

where T is the maximum accumulation time of signals from CO from the moment the first alarm signal arrives, s.

H is the maximum distance between the optical axes of the ZO, traversed by the intruder, m;

V _MIN ^_ minimum possible speed of the offender, m / s.

The maximum distance between the optical axes of the OZ, traversed by the intruder, is taken as the sum of the lengths of the two largest segments: OA ', OB', OC, OD '(Fig. 3). The minimum possible speed of the offender is taken based on the terrain conditions. The speed range of the intruder in different parts of the terrain is known and confirmed on the basis of experimental studies (Fig. 5). [8, 10]

A method for detecting an intruder, recognizing his type and direction of movement using two-beam passive infrared detection means includes two stages: preparatory and main.

The preparatory stage includes:

1. Deployment of a detector 1 with a transmitter, a detector 2 with a transmitter and a detector 3 with a transmitter at an X-shaped intersection of roads according to the established scheme and taking into account the calculated minimum distance (S _MIN ) from the detector 1 (2, 3) with a transmitter to the road farthest from it (Fig. 3), (formula 1).

2. Deployment on the ground of a system 5 for collecting and processing information, which includes a timer control device 6, a timer 7, a signal receiver 8, a decision device 9 and a monitor 10 (Fig. 6).

3. Calculation of the maximum accumulation time of alarm signals from CO from the moment of receipt of the first alarm signal from it (T) and loading it into the deciding device 9 (formula 2).

4. Start of operation of the detection means 1 with the transmitter, the detection means 2 with the transmitter and the detection means 3 with the transmitter in standby mode.

The main stage begins when the intruder crosses one of the COs: means 1 for detecting with a transmitter, means 2 for detecting with a transmitter or means 3 for detecting with a transmitter, it includes:

1. The transition of the means 1 (2, 3) detection with the transmitter in the alarm mode, determining the side of movement of the intruder and transmitting the signal to the system 5 for collecting and processing information (Fig. 6).

2. Registration of the signal by the receiver 8 of signals from the detection means 1 (2, 3) with the transmitter, starting the timer 7 by the timer control device 6, starting the countdown of the time for accumulating alarm signals (Fig. 6).

3. Writing information to the device 9 is crucial (Fig. 6).

4. Automatic transition of the detection means 1 (2, 3) with the transmitter to the standby mode after the intruder leaves the detection zone (Fig. 6).

5. Depending on the type of the intruder and the direction of his movement, the end of registration or registration of one or two more alarm signals from the detection means 1 (2, 3) with the transmitter receiver 8 of the information collection and processing system 5 (Figs. 4, 6).

6. Writing information to the device 9 is crucial (Fig. 6).

7. By transmitting the signal by the timer 7 to the device 9 decisive about reaching the accumulation time of alarms from the detection means from the moment the first alarm of the maximum value (T) arrives from it (Fig. 6), (formula 2).

8. Formation of the conclusion about the type of intruder and the direction of his movement by device 9 is decisive (Fig. 6).

9. Resetting timer 7 by timer control device 6. Outputting the result about the type of the intruder and the direction of his movement on the monitor 10 (Fig. 6).

The essence of the invention is illustrated by graphic materials, where it is presented on:

- fig. 1 - generalized basic characteristics of two-beam passive infrared detectors;

- fig. 2 is a diagram of the deployment of four two-beam passive infrared detection means in the known method of detecting an intruder, recognizing his type and direction of movement using two-beam passive infrared detecting means;

- fig. 3 is a diagram of the deployment of two-beam passive infrared detectors in the proposed method for detecting an intruder, recognizing his type and direction of movement using two-beam passive infrared detectors;

- fig. 4 - table for making a decision on the type of intruder and the direction of his movement (algorithm) in the proposed method for detecting an intruder, recognizing his type and direction of movement using two-beam passive infrared detection means;

- fig. 5 - table of the speed ranges of the intruder in different parts of the terrain;

- fig. 6 is a block diagram of the interconnection of the devices used when implementing the proposed method for detecting an intruder, recognizing his type and direction of movement using two-beam passive infrared detection means.

The technical result consists in obtaining the possibility of recognizing the type of intruder - a walking intruder or an intruder in a car, the direction of its movement with a low probability of error and using only three COs.

Sources of information

1. Shumov, V.V. Application of mathematical methods and models to substantiate decisions on the protection of the state border: Scientific and practical guide. - Part 2. - M .: Education, 1996 .-- 196 p.

2. Gruba, I. Security alarm systems. Technical means of detection / I. Gruba. - M .: Solon-press, 2012 .-- 220 p.

3. Magauenov, R.G. Security alarm systems: the basics of theory and principles of construction: textbook. allowance / R.G. Magauenov - M .: Goryachaya - Telekom, 2004 .-- 367 p.

4. Zvezhinsky, S.S. Rapidly deployable detection and security alarm systems // Special equipment. - 2003. - No. 5. - S. 11-23.

5. RSK "Radiobarrier-MF". Operation manual PMEK.424242.9000RE - M: "Polyus-ST", 2011. - 65 p.

6. Mobile complex for the protection of the area "Mongoose". Operation manual STVF.425624.001 RE - Stavropol: Stilsoft, 2017. - 52 p.

7. Pat. 2712648 Russian Federation, MPK51 G08B 13/19 Method of recognizing the type of intruder by infrared detection tool / S.А. Udot, I. D. Sable - No. 2019114471; declared 05/08/19; publ. 30.01.20, Bul. No. 4.

8. Psarev, A.A. Military Topography: A Textbook. - Moscow: Military Publishing, 1986 .-- 384 p.

9. Korshnyakov, V.G. Signaling means of protection of local areas: uch. allowance / V.G. Korshnyakov - Kaliningrad: KPI FSB RF, 2004 .-- 135 p.

10. Balenko, S.V. School of survival. - M., 1994 .-- 140 p.

Claims (1)

A method for detecting an intruder, recognizing his type and direction of movement using two-beam passive infrared detection means, which consists in monitoring an X-shaped intersection of roads with two-beam passive infrared detection means; detection by means of detecting the intruder and determining his side of movement when he crosses the detection zone; in providing registration by the system of collection and processing of information signals from the detection means; setting the maximum time for the accumulation of signals from the detection means by the system for collecting and processing information from the moment the first alarm signal arrives based on the minimum possible speed of a person on the road and the distance traveled between the detection zones of the detection means, characterized in that two of the three detection means are installed diagonally from opposite inner sides of the X-shaped intersection of roads and are oriented so that their detection zones intersect two roads; for each of the three detection means, the minimum permissible distance to the road farthest from it is set, at which the detection zone of a person and a vehicle by the detection means crossed only the road closest to it, and the detection zone of only a car crossed only the long road; the third detection means is installed on the outside of the X-shaped intersection of roads and is oriented so that its detection zone of a person and a car intersects on the road with the detection zone of only a car of one detection device, and the detection zone of only a car intersects on another road with a detection zone of a person and a vehicle remaining detection means; an algorithm is used that recognizes the type of intruder by the number of alarms received during the set maximum signal accumulation time: one or two alarms - a pedestrian intruder, three signals - an intruder in a car; the algorithm recognizes the direction of movement of the offender by the sequence of transmission of alarm signals by means of detection and the sides of the movement of the offender indicated by them relative to the center of the X-shaped intersection of roads.

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