RU2712648C1 - Method of identifying intruder type due infrared detection means - Google Patents

Abstract

FIELD: data processing.

SUBSTANCE: invention relates to methods for recognizing intruder type. Method consists in installation of one detection device (DD) at road at distance of not less than 40 % of maximum length of detection area (DA) so, that its width in point of intersection with road is not less than 1 meter; aligning the DD such that its two-beam DA axis crosses the road section at angle of 90 degrees; transition of DD into alarm mode when intruder crosses its two-beam DA; recording DD of useful signal during its entire time in alarm mode; use in DD algorithm for determining type of intruder based on a useful signal form: a first pulse of a useful signal generated when crossing intruder DA, has one local maximum or minimum – pedestrian intruder, first pulse of useful signal formed at crossing by intruder DA, has two local maxima or minima – intruder on wheeled vehicle; transmitting DD information on intruder type – pedestrian intruder or intruder on vehicle to DCPS; enabling registration of DCPS alarm signal and information on intruder type from DD.

EFFECT: technical result consists in reduction of error probability during recognition.

1 cl, 11 dwg

Description

The invention relates to methods for recognizing the type of intruder and can be used in cases where one double-beam passive infrared detection means is used for signaling control of a road section.

As a rule, the route of the intruder on the ground goes along the existing network of paths and roads. Important for the response forces is not only knowledge of the fact of violation and the direction of movement of the intruder, but also of its type (on foot or in a vehicle), which makes it possible to correctly assess the range of speeds of the intruder and thereby most accurately determine the area of his search, thereby increasing the probability of his detention [1 ].

For the signal cover of a network of paths and roads, passive infrared detection means (CO) with a two-beam detection zone (ZO) up to 50 meters long are widely used. Analysis of CO used for the protection of land, foreign production (“Rembass”, “Rembass 2” - USA, CLASSIC - Great Britain, etc.) and domestic (RS-IR - “Polyus-ST”, Radium BRK-IR - “Umirs” , Mongoose - “SteelSoft” and others) shows that they use a typical pyroelectric converter consisting of two differentially switched half-segments (DUAL), the geometric dimensions of the AO and the main characteristics of these tools are close to each other (Fig. 1) [2 -5]. At the same time, there are no JIs defining the type of intruder - on foot or on a vehicle.

According to GOST R 50777-2014, the standard goal for the considered JI is a person weighing 50-70 kg, height 165-180 cm, dressed in cotton pants, a jacket or bathrobe and a knitted hat [6]. The vehicle is not considered as a target, although the probability of an intruder appearing on the vehicle during security monitoring of the road network is quite high, especially on a wheeled one (car, ATV) [1].

) друг от друга; ориентировании средства 1 обнаружения и средства 2 обнаружения так, чтобы оси их двухлучевых ЗО пересекали участки дороги под углом 90 градусов; переходе средства 1 обнаружения и средства 2 обнаружения поочередно (в зависимости от направления движения нарушителя через данный участок дороги) в режим тревоги при пересечении нарушителем двухлучевых ЗО; обеспечении регистрации системой 3 сбора и обработки информации сигналов тревоги от средства 1 обнаружения и средства 2 обнаружения при пересечении их двухлучевых ЗО нарушителем, движущимся по дороге, вычислении временного интервала между ними и средней скорости нарушителя; определении системой 3 сбора и обработки информации типа нарушителя по скорости его движения: до 5 м/с - нарушитель 4 пеший, свыше 5 м/с - нарушитель 5 на колесном транспортном (фиг. 2) [1].There is a method of recognizing the type of intruder by its speed of movement, which consists in installing a means of detection 1 and means 2 of detection near the road at a predetermined distance (

) from each other; orienting the detection means 1 and the detection means 2 so that the axes of their two-beam DA cross sections of the road at an angle of 90 degrees; transition of the detection means 1 and the detection means 2 alternately (depending on the direction of the intruder’s movement through a given section of the road) to the alarm mode when the intruder crosses the two-beam AOs; ensuring registration by the system 3 of the collection and processing of information of alarms from the detection means 1 and the detection means 2 when their two-beam DA crosses the intruder moving along the road, calculating the time interval between them and the average speed of the intruder; the system 3 determines the collection and processing of information of the type of intruder by its speed: up to 5 m / s - offender 4 on foot, more than 5 m / s - offender 5 on a wheeled vehicle (Fig. 2) [1].

The disadvantages of the known method of recognizing the type of intruder are the high probability of error in recognition due to the imposition of two speed ranges (a walking intruder can move at a speed of more than 5 m / s and a wheeled vehicle with a speed below 5 m / s) and the need to use two COs. Moreover, the lower the patency of roads (trails) - the greater the imposition of speed ranges and the higher the probability of error [1]. The considered JI used to protect areas of the area and included in the mobile alarm systems have a high market value of tens of thousands of rubles.

The aim of the invention is to obtain recognition of the type of intruder - a walking intruder or intruder on a wheeled vehicle (car, ATV) with a low probability of error and using only one CO.

To achieve this goal, a method for recognizing the type of intruder with an infrared detection tool has been developed, which consists in installing one detection tool 1 at the road at a distance of not less than 40% of the maximum length of the DA so that its width at the intersection with the road is at least 1 meter; orienting the detection means 1 so that the axis of its two-beam DA crosses a section of the road at an angle of 90 degrees; the transition of the detection means 1 to the alarm mode when the intruder crosses his two-beam DA; recording by means 1 of detecting a useful signal during the whole time it is in alarm mode; in the means for detecting means 1, an algorithm for determining the type of intruder by the shape of the useful signal is used: the first pulse of the useful signal generated when the intruder crosses the AE has one local maximum (minimum) - the intruder is 4 feet, the first pulse of the useful signal generated when the intruder crosses the AE has two local maximum (minimum) - intruder 5 on a wheeled vehicle; the transmission by means of detection means 1 of information on the type of intruder — the offender 4 on foot or the offender 5 on the vehicle to the system 3 for collecting and processing information; ensuring registration by the system 3 of the collection and processing of alarm information and information about the type of intruder from the detection means 1 (Fig. 3).

It is known that the principle of operation of passive infrared detection means is based on the registration of signals generated by the heat flux emitted by the detection object (intruder) [7, 8].

It is known that the CO sensitive element (pyrodetector) consists of two differentially included half-segments (first and second) forming a difference system [7, 8]. These half segments together with the optical system form a cone-shaped DZ of the detection means 1 consisting of two sectors (Fig. 3). When an intruder enters the AE sector, a positive potential is formed on the corresponding half-segment of the pyroelectric receiver. Due to the fact that the half-segments are connected to the differential resultant useful signal from the pyrodetector when the interceptor crosses the GD, it is two opposite-polarity impulses [7, 8]:

where S (t) is the useful signal of the pyrodetector, μV;

S1 (t) is the signal formed in the first half segment of the pyrodetector CO, μV;

S2 (t) is the signal formed in the second half segment of the CO pyrodetector, μV.

So, when an intruder enters first into the first sector of the AO, the level of the useful signal increases, forming a positive pulse 6, and when moving to the second sector of the AO, decreases, forming a negative pulse 7 (Fig. 4). And vice versa, when an intruder enters first into the second sector of the AO, the level of the useful signal first decreases and an impulse 8 is formed at the same time; when moving to the first sector of the AO, the level of the useful signal increases and an impulse 9 is formed (Fig. 5).

It is proposed to install a means of detection 1 on the road at a distance of (N) of at least 40% of the maximum length of the AO (L), which, with a minimum horizontal viewing angle of the pyroelectric receiver of 3 degrees, will provide a width of AO (F) at the intersection with the road of at least 1 meter ( Fig. 3).

where F is the width of the DA at the point of intersection with the road, m;

α is the horizontal viewing angle of the pyrodetector, deg .;

N - distance from CO to the road, m

When considering the thermogram of a walking intruder, the profile width of which (0.3-0.4 m) is several times smaller than the width of the DA at the point of its intersection with the road (≥1 m), one of the most heated zone is distinguished and presented as a point heat radiator (Fig. . 6). Therefore, the signal generated by the pyrodetector when such an intruder crosses the AO is a sequence of pulses, each of which has one local maximum or minimum, regardless of the speed of the intruder (Fig. 4, 5) [8].

When considering the vehicle’s thermograms 2-5.5 m long and, correspondingly, exceeding the width of the DA at the intersection with the road (≥1 m), two most heated zones are clearly distinguished - zone 10 front (engine and front wheel) and zone 11 back ( rear wheel and exhaust pipe) (Fig. 7, 8).

The authors found that when crossing a roadside developed across the road according to the proposed scheme, a wheeled vehicle in impulse 12 or impulse 14 of the useful signal, depending on the direction of movement, forms two local maximums or minimums, respectively. This is due to the fact that, unlike a person, a wheeled vehicle is not one, but two point heat emitters, with a distance between them several times the width of the DA (Fig. 9, 10).

The authors found that these local maxima or minima are significant signs indicating the detection of a wheeled vehicle, and are present in the signal over the entire range of vehicle speeds - from 3 to 17 m / s (10-60 km / h). This symptom is not distinguished at the intersection of the AO in a place where its width is less than 0.5 m and is not guaranteed when the width of the AO is 0.5-0.9 m, since the residence time of an object moving at a speed of more than 11 m / s (40 km / h), inside the DA it is small and does not provide the formation of two local maxima or minima. Therefore, in the requirements for the deployment of CO on the road, the distance from the CO to the road should be at least 40% of the maximum length of the AO. Thus, the proposed method provides a low probability of error compared to the known one, since the recognition result does not depend on the speed of the intruder.

Given the shape of the useful signal from the pyroelectric receiver, the CO determines the type of intruder according to the following algorithm:

- if the first impulse of the useful signal generated when the intruder crosses the AO has one local maximum or minimum, then the type of intruder is a foot intruder;

- if the first impulse of the useful signal generated when the intruder crosses the AE has two local maximums or minimums, then the type of the intruder is the intruder on a wheeled vehicle.

Alarms, information about the type of intruder are transmitted to the SSOI.

The method for recognizing the type of intruder with an infrared detection means includes two stages: preparatory and main.

Preparatory stage:

1. Deployment of a means of detection 1 at a controlled section of the road according to the established scheme, which includes: an optical system 16, a pyroelectric receiver 17, an amplifier 18, an alarm driver 19, an alarm interface 20, a memory device 21, a decisive device 22 (Fig. 11).

2. Writing to the device 22 the decisive algorithm for determining the type of intruder.

3. The start of the means 1 detection in standby mode.

The main stage begins when the offender moves through a controlled section of the road and when he enters the AO detection means 1, it includes:

1. The formation of the useful signal by the pyrodetector 17, the amplification of the signal by the amplifier 18 and the signal at the input of the shaper 19 of the alarm signals (Fig. 11).

2. The formation of the alarm by the driver 19 of the alarm signals and the recording device 21 of the memory pulses of the useful signal generated by the pyrodetector 17.

3. The determination by the device 22 of the decisive number of local maxima or minima in the first pulse of the useful signal and the decision on the type of intruder that crossed the AO:

- if the first impulse of the useful signal generated when the intruder crosses the AO has one local maximum or minimum, then the type of intruder is a foot intruder;

- if the first impulse of the useful signal generated when the intruder crosses the AE has two local maximums or minimums, then the type of the intruder is the intruder on a wheeled vehicle.

4. The transmission by the detection means 1 through the interface 20 of the alarm signal and information about the type of intruder to the system 3 for collecting and processing information (Fig. 11).

5. The system 3 receives and collects information from the interface 20 of the alarm signal and information to the type of intruder (Fig. 11).

6. Zeroing the device 21 memory (Fig. 11).

The invention is illustrated graphic materials, which are presented on:

- FIG. 1 - generalized basic characteristics of a two-beam passive infrared detection means;

- FIG. 2 is a deployment diagram of two double-beam passive infrared detection means in a known method for recognizing an intruder type;

- FIG. 3 is a deployment diagram of a two-beam passive infrared detection means in the proposed method for recognizing the type of intruder with a passive infrared detection means indicating dimensions;

- FIG. 4 - the shape of the useful signal coming from the pyrodetector at the sequential intersection of the first and second sectors of the detection zone by a foot intruder;

- FIG. 5 - the shape of the useful signal coming from the pyrodetector during the sequential intersection of the second and first sectors of the detection zone by a foot intruder;

- FIG. 6 - profile of a walking intruder with an indication of its width;

- FIG. 7 is a profile of a wheeled vehicle with dimensions (automobile);

- FIG. 8 - a profile of a wheeled vehicle with an indication of dimensions (ATV);

- FIG. 9 is a form of the useful signal coming from the pyroelectric receiver during the successive intersection of the first and second sectors of the detection zone by the intruder on a wheeled vehicle;

- FIG. 10 - the shape of the useful signal from the pyroelectric receiver during the sequential intersection of the second and first sectors of the detection zone by the intruder on a wheeled vehicle;

- FIG. 11 is a structural diagram of the relationship of the devices used when implementing the method of recognizing the type of intruder.

The technical result consists in the possibility of recognizing the type of intruder - a walking intruder or an intruder on a wheeled vehicle (car, ATV), with a low probability of error and using only one CO.

Sources of information

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

2. Zvezhinsky, S.S. Quickly deployable detection tools and alarm systems // Special equipment. - 2003. - No. 5. - S. 11-23.

3. RSK "Radio-barrier-MF". Operation manual PMEK.424242.9000RE - M.: Polyus-ST, 2011. - 65 p.

4. Quickly deployed complex "Radium - DBK". Operation manual USDP.425149.001RE - Penza: UMIRS, 2013. - 41 p.

5. Mobile security complex site "Mongoose". Operation manual STVF.425624.001 RE - Stavropol: Stilsoft, 2017. - 52 p.

6. GOST R 50777-2014. Passive optical-electronic infrared detectors for indoor and outdoor use. General technical requirements and test methods. - Enter. 2016-01-01. M .: FSUE “Standardinform”, 2014. - 36 p.

7. Gruba, I. Alarm systems. Technical means of detection / I. Gruba. - M .: Solon-press, 2012 .-- 220 p.

8. Magauenov, R.G. Burglar alarm systems: the basics of theory and construction principles: study. allowance / R.G. Magauenov - M .: Hot - Telecom, 2004 .-- 367 p.

Claims (1)

A method for recognizing the type of intruder with an infrared detection means, which consists in installing one infrared detection means near a road; orienting this detection means so that the axis of its two-beam detection zone intersects a section of the road at an angle of 90 degrees; transition of the detection means to the alarm mode when the intruder crosses his two-beam detection zone; recordings by the detection means of the useful signal during the whole time it is in alarm mode; ensuring registration by the system of collecting and processing information of the alarm signal from the detection means at the intersection of the two-beam detection zone by an intruder moving along the road, characterized in that the width of the detection zone at the point of its intersection with the road is at least 1 meter, for which the pyroelectric detector detection means is installed off the road at a distance of at least 40% of the maximum length of the detection zone; the use in the detection tool of an algorithm for determining the type of intruder by the shape of the useful signal: in such a way that the first pulse of the useful signal generated when the intruder crosses the detection zone has one local maximum or minimum - a walking intruder, the first pulse of the useful signal generated when the intruder crosses the detection zone has two local maximums or minimums - the intruder on a wheeled vehicle; the detection tool transmits information on the type of intruder to the system for collecting and processing information — a foot intruder or an intruder in a wheeled vehicle.

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