RU2777744C1 - Method for detecting an offender, recognising the type thereof, and determining the direction of movement applying passive infrared means of detection - Google Patents

Abstract

FIELD: surveillance.

SUBSTANCE: invention relates to methods for security area monitoring and can be used in cases of application of dual-beam passive infrared means of detection (SO) for signalling control of the traffic network. Method consists in deploying two SOs at a T-junction so that the optical axis of the detection zone (ZO) of each SO crosses two roads, one SO is located near the main road, the other SO is located near the adjacent road, and the optical axes of the SOs intersect on the adjacent road; the minimum permissible distance from the SO to the road farthest therefrom is then set, wherein the ZO of the person crosses only the nearest road, and the ZO of the automobile crosses the nearest and the farthest roads; the maximum time for accumulation of signals from the SO by the information collection and processing system (SSOI) from the moment of reception of the first alarm signal is set based on the minimum possible speed of the person in the road and the distance traversed by the person between the ZOs of the means of detection. The signals from the SO are then recorded by the SSOI, the SO of the offender is detected and their sides of movement relative to the centre of the junction when the offender is crossing the ZO are detected. An algorithm is applied, recognising the type of offender — a driving offender (NA) or a pedestrian offender (PN), and determining the direction of movement thereof by one, two, or three alarm signals received from the SO, the sequence of transmission of said alarm signals from the SO and the sides of the movement of the offender relative to the centre of the T-junction specified thereby for the set maximum time of accumulation of alarm signals.

EFFECT: provided possibility of recognising the type of offender — PN or NA, with a low probability of error.

1 cl, 6 dwg

Description

The invention relates to methods for monitoring terrain and can be used in cases where two-beam passive infrared detection tools are used for signaling control of the road network.

As a rule, the route of movement of the intruder on the ground passes through the existing network of trails 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 in a car), which allows you to correctly assess the purpose and nature of the subsequent actions of the intruder, and thus, choose the most effective actions to search for and detain him. [one]

For signaling cover of the network of trails and roads, passive infrared detection tools (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 transducer consisting of two differentially included half-segments (DUAL), the geometric dimensions of the SO and the main characteristics of these tools are close to each other values (figure 1). [2-6] The most informative of them ("Rembass", "Rembass 2" - USA, CLASSIC - Great Britain, etc.) determine the side of the intersection of the two-beam SR according to the order of arrival of the useful signal pulses of different polarity (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. There is a known method of recognizing the type of intruder with an infrared detection tool, but it requires a software upgrade of the COs already produced by the industry. [7] One of the most common elements of the road network is the T-junction.[8]

A known method of detecting an intruder, determining the direction of his movement and recognizing his type by speed, using passive infrared detection means, which consists in deploying detection means 1 and detection means 2 at a T-shaped intersection of roads so that the detection zone of each of them covers two roads at once; detection by the detection means 1 and the detection means 2 of the intruder when he crosses the detection zone; in ensuring the registration by the system 3 of collecting and processing information of signals from detection tools; setting the maximum time for the accumulation by the system 3 of collecting and processing information of signals from the detection means from the moment the first alarm is received, based on the minimum possible speed of a person on the road and the distance traveled by him between the detection zones of the detection means; determination by the system 3 of collecting and processing information of the type of the intruder by the speed of his movement: up to 5 m/s - the intruder on foot, more than 5 m/s - the intruder in the car, determining the direction of movement of the intruder according to the order of receipt of alarms from the detection means (figure 2) . [9]

As with all methods for recognizing the type of an intruder by the speed of his movement, determined over a short distance, the disadvantage of the considered method is the high probability of error in recognizing the type of intruder due to the possible delay in the arrival of signals from the SO at the SSIS and the overlap of two speed ranges (a foot intruder can move at a speed greater than 5 m/s, and a vehicle at a speed below 5 m/s). Moreover, the lower the passability of roads (paths) and the smaller the distance covered by the intruder from one zone to another zone, the greater the overlap of speed ranges and the higher the probability of error. [ten]

The aim of the invention is to be able to recognize the type of intruder - a foot intruder or an intruder in a car with a low error probability.

To achieve this goal, a method has been developed for detecting an intruder, recognizing its type and determining the direction of movement using passive infrared detection tools, which consists in deploying two SOs at a T-shaped intersection of roads so that the optical axis of the detection zone (ZO) of each SO crosses two roads , one SO was near the main road, another SO was near the adjoining road, the optical axes of the SO intersected with each other on the adjoining road; setting the minimum allowable distance from a SO to the road farthest from it, at which the SO of a person SO crossed only the road closest to him, and the ZO of a car crossed the near and far roads; setting the maximum time for the accumulation by the information collection and processing system (ISPS) of signals from the CO from the moment the first alarm signal arrives, based on the minimum possible speed of a person along the road and the distance traveled by him between the detection means; in ensuring the registration of SOI signals from SO; detection of the intruder's SO and determination of its direction of movement relative to the center of the road intersection when it crosses the WA; application of an algorithm that recognizes the type of intruder - an intruder in a car (ON) or an intruder on foot (PN) and determines the direction of his movement according to one, two or three alarms received from the CO, the order in which these alarm signals are transmitted to the CO and the directions of movement indicated by them the intruder relative to the center of the T-shaped intersection of roads for the maximum time for the accumulation of alarms (figure 3, 4).

It is known that the length of the SO of a person SO is at least two times less than that of a car. [2, 3] A significant difference in the length of the SR 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 SR 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 smaller. The temperature of the car (engine, chassis) is much higher than the temperature of a person. It is known that the larger the size of the SO, 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 useful signal amplitudes (signal amplitude from a car is significantly higher, all other things being equal), which means that a car can be detected by a CO at a greater distance than a person.

When installing a CO, it is necessary to set the minimum allowable distance from the CO to the road farthest from it. This minimum distance must be greater than the length of the DO of a person, but less than the length of the DO of the car (figure 3). Then, when driving along any of the roads, an intruder in a car will be detected when crossing the DO in any of its sections (far and near to the SO), and when moving on foot, only when crossing the DO section closest to the SO. The proposed CO deployment scheme makes it possible to receive from one to two alarms when an intruder is moving on foot and from two to three alarms when an intruder is moving in a car. One and the same CO gives out two separate signals only when the intruder is moving in a car. The analysis of these data, together with the side of the movement of the intruder indicated by the SO relative to the center of the road intersection, is used in the SSID algorithm to recognize the type of the intruder and determine the direction of his movement (figure 4). When an intruder moves in a car along an adjoining road (OS), the alarm signal is transmitted by both COs indicating the same direction of movement relative to the center of the intersection of roads, while the sequence of CO activation may be different and has a random character: CO1, CO2 or CO2, CO1 ( Fig.3, 4). In the recognition algorithm, these sequences are equivalent and indicate the same type of intruder and the direction of his movement (figure 4).

The minimum allowable distance from the CO to the road farthest from it must be taken taking into account ensuring 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 that declared by the manufacturer:

where S _min is the minimum distance from the detection tool to the road farthest from it, m;

L _AUTO - maximum length of the vehicle detection zone, m;

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

As a rule, for a two-beam CO, the maximum length of the SO 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 SO to the road farthest from it (S _min ) will be 75 m (see formula 1). The maximum SO for a person and, therefore, for a car can be set by setting the CO sensitivity threshold (for example, 20 m, 30 m, 40 m, 50 m). [5] The presence of this functionality in SO allows solving the problem of their placement according to the proposed scheme on different types of terrain.

The maximum time for the accumulation of signals from the CO from the moment the first alarm signal (T) is received is set to eliminate errors in the conclusion about the type of the detected object in the SOI. The maximum accumulation time of signals from CO is determined based on the minimum possible speed of a person through a T-shaped intersection and the distance traveled by an intruder between CO detection zones, and is taken from a safety factor of 1.2:

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

S is the distance traveled by the intruder between the detection zones of the detection means, m;

V _min - the minimum possible speed of the intruder, m/s.

Distance S is defined as the sum of the lengths of the two largest segments OA', OB' or OS (figure 3). The minimum possible speed is taken based on the conditions of the terrain. The speed range of the intruder in different areas of the terrain is known and confirmed on the basis of experimental studies (figure 5). [8, 10]

The method for detecting an intruder, recognizing its type and determining the direction of movement using passive infrared detection means includes two stages: preparatory and main.

The preparatory stage includes:

1. Deployment of the detection means 1 with the transmitter and the detection means 2 with the transmitter at the T-shaped intersection of roads according to the established scheme, taking into account the calculated minimum distance (S _min ) from the detection means 1 with the transmitter to the road farthest from it and from the detection means 2 with transmitter to the farthest road from him (figure 3), (formula 1).

2. Deployment on the ground of a system 3 for collecting and processing information, including a timer control device 4, a timer 5, a signal receiver 6, a resolver 7 and a monitor 8 (Fig.6).

3. Calculation of the maximum accumulation time of alarm signals from the detection means 1 with the transmitter and the detection means 2 with the transmitter from the moment the first alarm signal (T) arrives from it and loading it into the solver 7 (formula 2), (Fig.6).

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

The main stage begins when the intruder crosses the detection means 1 with the transmitter or the detection means 2 with the transmitter, it includes:

1. The transition of the detection means 1 (2) with the transmitter to the alarm mode, determining the direction of movement of the intruder relative to the center of the T-shaped intersection and signal transmission to the system 3 for collecting and processing information (Fig.6).

2. Registration by the receiver 6 of the signal from the detection means 1 (2) with the transmitter, the start of the timer 5 by the timer control device 4, the start of counting the alarm accumulation time (Fig.6).

3. Recording information in the device 7 decisive (Fig.6).

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

5. Continued detection of the intruder by means of detection 1 (2) in the event that he re-crosses their WA (provided that the intruder on foot is moving at that moment along the road closest to the means 1 (2) of detection and under any traffic conditions for the intruder in a car), determination of the direction of its movement and transmission of signals to the system 3 for collecting and processing information (Fig.6).

6. Registration by the receiver 6 of the signals from the detection means 1 (2) with the transmitter (Fig. 6).

7. Recording information in the device 7 decisive (Fig.6).

8. Timer 6 transmits a signal to device 7, which decides on the achievement of the accumulation time of alarm signals from the detection means from the moment the first alarm signal of the maximum value (T) (figure 5), (formula 2) arrives.

9. Formation of a conclusion about the type of intruder and the direction of his movement by the device 7 decisive (Fig.6).

10. Resetting the timer 6 by the timer control device 5. Displaying the result of the type of intruder and the direction of his movement on the monitor 8 (Fig.6).

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

- Fig.1 - generalized main characteristics of two-beam passive infrared detection means;

- figure 2 is a diagram of the deployment of two dual-beam passive infrared detection means in a known method for detecting an intruder, determining the direction of its movement and recognizing its type by the speed of movement;

- figure 3 is a diagram of the deployment of two dual-beam passive infrared detection tools in the proposed method for detecting an intruder, recognizing its type and determining the direction of movement using passive infrared detection tools;

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

- Fig.5 - table of speed ranges of the intruder in different areas of the terrain;

- Fig.6 - block diagram of the interconnection of the devices used in the implementation of the proposed method for detecting an intruder, recognizing its type and determining the direction of movement using passive infrared detection tools.

The technical result consists in obtaining the possibility of recognizing the type of intruder - an intruder on foot or an intruder in a car with a low error probability.

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.: Enlightenment, 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. Burglar alarm systems: fundamentals of theory and principles of construction: account. allowance / R.G. Magauenov - M.: Hot - Telecom, 2004.-367 p.

4. Zvezhinsky, S.S. Rapidly deployable detection tools and burglar alarm systems // Special Technique. - 2003. - No. 5. - P.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: "Steelsoft", 2017. - 52 p.

7. Pat. 2712648 Russian Federation, MPK51 G08B 13/19 A method for recognizing the type of intruder by an infrared detection tool / S.A. Udot, I.D. Sable - No. 2019114471; dec. 05/08/19; publ. 01/30/20, Bull. No. 4.

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

9. Korshnyakov, V.G. Signaling means for the protection of local areas: account. 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 its type and determining the direction of movement using passive infrared detection tools, which consists in deploying two passive infrared detection tools at a T-shaped intersection of roads so that the detection zone of each of them overlaps two roads at once; detection by the detection means of the intruder and determination of his direction of movement when he crosses the detection zone; in ensuring the registration by the system for collecting and processing information of signals from detection tools; setting the maximum time for the accumulation by the system of collecting and processing information of signals from detection tools from the moment the first alarm signal arrives, based on the minimum possible speed of a person along the road and the distance traveled by him between the detection zones of the detection tools, characterized in that the detection tools are set so that one of they were located near the main road, another detection tool was located near the road adjacent to it, the optical axes of the detection tools intersected with each other on the adjacent road; the minimum allowable distance from the detection device to the road farthest from it is set, at which the person detection zone by the detection device crossed only the road closest to it, and the vehicle detection zone crossed the near and far roads; an algorithm is used that recognizes the type of intruder - an intruder in a car or a foot intruder and determines the direction of his movement through the T-shaped intersection of roads according to one, two or three alarm signals received from the detection tools, the order in which these alarm signals are transmitted by the detection tools and indicated by them at the same time to the sides of the intruder's movement relative to the center of the Τ-shaped road intersection for the set maximum time for accumulating alarm signals.

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