RU2647651C1 - Method of security monitoring with application of passive optical-electronic detection means - Google Patents

Abstract

FIELD: surveillance systems.

SUBSTANCE: invention refers to security monitoring methods and can be used in cases, where one passive optoelectronic detection facility (CO) is applied for signaling control of the bend of the road. Method consists in controlling the bending of the road by means of one CO deployed in such a way that its detection zone crosses the road in two sections on both sides of the bend point of the road, the neighboring area to the CO was located at the distance of 10 to 15 meters from the facility, the distance to the CO site was at the distance from CO, which is equal to 60–80 percent of the maximum length of the detection zone; the CO transition to the alarm mode twice during the intruder's movement through the bend of the road; setting the maximum value of the accumulation time of alarms based on the minimum possible speed of the intruder and on the distance, which is traveled by him/her between the intersections of the detection zone with the road; memorizing the CO of both levels of useful signals during the entire duration of the alarm modes; application of the algorithm for determining the direction of the intruder's movement relative to the CO: according to the value of the ratio of the level of the useful signal, which arrived first, to the level of the useful signal, which was received as the second, more than one or less than one; in the transmission of the CO to the system for collecting and processing information on signals concerning the detection of the intruder and the direction of his/her movement: the intruder moves toward the CO or the intruder moves away from the CO.

EFFECT: technical result consists in obtaining the possibility of determining the direction of motion of the detected intruder using only one detector.

1 cl, 8 dwg

Description

The invention relates to security monitoring methods and can be used in cases where one passive optoelectronic detection means (CO) is used for signaling control of a road bend.

As a rule, the route of the intruder on the ground passes through the existing road network. Knowledge of the direction of movement of the intruder by the reaction forces is of great importance, since it allows you to narrow the direction of his search and thereby increase the likelihood of his detection and detention [1]. Therefore, significant attention is paid to the signal cover of the road network. For this task, passive optoelectronic detection tools with a detection zone (AO) length of 50-100 meters are widely used.

There is a method of security monitoring, which consists in monitoring the road with one CO, in ensuring the registration of a system for collecting and processing information (MTR) of alarm signals from the CO when the intruder crosses its AO (Fig. 1) [2, 3].

There is another way of security monitoring, which consists in monitoring the road with two COs, in ensuring the registration of SSOI of alarm signals from CO when the intruder crosses their AO, using an algorithm to determine the direction of movement of the detected intruder based on the analysis of the sequence of receipt of alarm signals from CO (Fig. 2) [2 , 3].

The disadvantage of the first specified method of security monitoring is the inability to determine the direction of movement of the detected intruder.

The second specified method of security monitoring has the ability to determine the direction of movement of the intruder, however, for its implementation it is necessary to deploy two SSs.

The aim of the invention is to obtain the ability to determine the direction of movement of the detected intruder using only one WITH.

As a rule, the road passing through the site is not absolutely straight, one of the most common elements of the road network is the bend of the road (curved turn, curved road - consisting of two adjacent straight sections of the road connected by a circular curve). [four]

To achieve this goal, a method of security monitoring using a passive optical-electronic detection tool has been developed, which consists in monitoring the bend of the road with one SO deployed so that its detection zone (ZO) crosses the road in two sections on both sides of the bend point of the road, to the CO, the plot was located at a distance of 10 to 15 meters from the facility, the section farthest to the CO was located at a distance from CO equal to 60-80 percent of the maximum length of the zone; CO transition to alarm mode twice during the movement of the intruder through the bend of the road; setting the maximum value of the time of accumulation of alarms based on the minimum possible speed of the intruder and the distance traveled by him between the sections of the intersection of the roadside with the road; memorizing the SB of both levels of useful signals throughout the duration of the alarm modes; the application of the algorithm for determining the direction of movement of the intruder relative to the CO by the value of the ratio of the level of the useful signal received by the first to the level of the useful signal received by the second is more than one or less than one; in transmitting a CO to a system for collecting and processing information about signals about the detection of an intruder and the direction of his movement: the intruder moves toward the CO or the intruder moves away from the CO (Fig. 3).

It is known that the principle of operation of passive optoelectronic detection means is based on the registration of signals generated by the heat flux emitted by the detection object (intruder) [5].

The useful signal at the output of the pyrodetector of a passive optoelectronic detection means is determined [5]:

where S (t) is the level of the useful signal, V;

S _U - volt sensitivity of the pyrodetector CO, B;

ΔФ (t) is the change in the heat flux incident on the input window of the optical system and caused by the movement of the intruder in the detection zone, W / m ² .

In turn, the maximum value of the heat flux from the intruder is determined by:

where ΔF is the maximum value of the heat flux from the intruder, W / m ² ;

N - distance from CO to the intruder, m;

S _ВХ - the area of the input window of the optical system WITH, m ² ;

S _H - the area of the projection of the intruder on a plane perpendicular to the direction of observation of CO, m ² ;

L _H - the brightness of the intruder, cd / m ² ;

L _F - background brightness in cd / m ^2.

That is, the signal at the output of the CO pyrodetector, ceteris paribus, the greater, the greater the degree of overlap by the intruder ZO and the smaller the distance to the CO itself [5]. The shape of the BO CO is cone-shaped, its width a few meters from the CO (F ') is tenths of a meter closer to the end of the zone (F) - a few meters (Fig. 4). At a distance of 10-15 meters from the CO, almost the entire body of the intruder is in the AO. The degree of overlapping by the intruder AO at this distance is higher than at a distance equal to 60-80 percent of the maximum length (L) of AO. (Fig. 5). With this in mind, as well as formulas 2 and 3 and the proposed deployment scheme of CO in the bend of the road, when the intruder moves through the zone of intersection of the AO with the road closest to the CO, the level of the useful signal will be higher than the level of the useful signal when the intruder moves through the section of the intersection far from the CO DA with the road (Fig. 3, 5):

where S _A is the level of the useful signal when the intruder moves through the section of the intersection of the detection zone with the road closest to the CO, V;

S _B - the level of the useful signal when the intruder moves through the section of the intersection of the detection zone with the road, farthest to the CO, V;

H _A is the distance between the CO and the near section of the intersection of the detection zone with the road, m;

H _B is the distance between the CO and the far section of the intersection of the detection zone with the road, m

Taking into account the proposed deployment scheme of CO, by the value of the ratio of the level of the useful signal received by the first to the level of the useful signal received by the second (more than one or less than one), we can conclude about the direction of movement of the detected intruder:

- if the value of the ratio of the level of the useful signal received by the first (S ₁ ) to the level of the useful signal received by the second (S ₂ ) is greater than unity, then the direction of movement of the intruder in the direction from CO (direction AB) (Fig. 3);

- if the value of the ratio of the level of the useful signal received by the first (S ₁ ) to the level of the useful signal received by the second (S ₂ ) is less than one, then the direction of movement of the intruder towards the CO (direction VA) (Fig. 3):

To exclude output errors, incoming signals are received within the set alarm accumulation time Δt. The maximum value of the accumulation time of alarms (T) is determined based on the distance between the two sections of suppressing the roadside with the road, the minimum speed of the intruder and the safety factor 1, 2 (Fig. 3, 6):

where T is the maximum value of the accumulation time of alarms, s;

A'O 'is the distance between the top of the bend of the road and the section of the intersection of the roadside with the road closest to the CO, m;

O'B '- the distance between the top of the bend of the road and the area of suppression of the road with the road farthest from the CO, m;

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

The minimum possible speed is taken based on the terrain. The range of speeds of the intruder in different parts of the terrain is known and confirmed on the basis of experimental studies (Fig. 6) [4, 6].

Information about the direction of movement of the intruder (the intruder moves toward the CO or the intruder moves away from the CO) is transmitted to the CO system for collecting and processing information over the air.

The road monitoring security method includes two stages: preparatory and main.

Preparatory stage:

1. The deployment on the ground of the system 1 for collecting and processing information (Fig. 8).

2. Deployment on a bend of the road according to the established scheme of passive optoelectronic detection means, which includes: optical system 2, pyrodetector 3, amplifier 4, alarm driver 5, alarm interface 6, memory device 7, decisive device 8 (Fig. 3 , 8).

3. Calculation of the set accumulation time of incoming alarms (T) and recording it in the memory device 7 (formula 6).

The main stage begins when the intruder moves through the bend of the road and gets into the AO CO, it includes:

1. Focusing the infrared electromagnetic radiation from the intruder using the optical system 2 to the pyrodetector 3. Signal generation by the pyrodetector 3, signal amplification by amplifier 4, and signal input to the shaper 5 of the alarm signals.

2. The formation of the first alarm by the shaper 5 alarms (Fig. 8).

3. Transmission via interface 6 to the alarm system 1 of collecting and processing alarm information (Fig. 8).

4. Transmission of the control command by the shaper 5 of the alarm device 7 memory at the beginning of memorizing the level of the useful signal coming from the pyroelectric receiver 3 (Fig. 8).

5. The beginning of storing the level of the useful signal and the countdown time of the accumulation of alarms (Δt) by the memory device 7 (Fig. 8).

6. The intruder’s exit from the defense industry. The termination of the formation of the alarm by the shaper 5 alarms (Fig. 8).

7. Transmission of the control command by the shaper 5 of the alarm to the memory device 7 at the end of storing the level of the signal from the pyroelectric receiver 3 (Fig. 8).

8. The second crossing by the violator of the AOR.

9. Focusing the infrared electromagnetic radiation from the intruder using the optical system 2 to the pyrodetector 3. Signal generation by the pyrodetector 3, signal amplification by amplifier 4, and signal input to the alarm driver 5 (Fig. 8).

10. The formation of the second alarm by the shaper 5 alarms (Fig. 8).

11. Transmission through the signal interface 6 to the system 1 for collecting and processing information of the second alarm signal (Fig. 8).

12. Transmission of the control command of the shaper 5 of the alarm to the memory device 7 at the beginning of storing the level of the useful signal from the pyroelectric receiver 3 (Fig. 8).

13. The beginning of storing the level of the useful signal received by the second memory device 7 (Fig. 8).

14. The exit of the offender from the defense of the SO. The termination of the formation of the alarm by the shaper 5 alarms (Fig. 8).

15. Transmission of the control command by the shaper 5 of the alarm to the memory device 7 at the end of storing the level of the signal coming in second from the pyroelectric receiver 3, and the end of the countdown of the accumulation of alarm signals (Δt) (Fig. 8).

16. The determination of the ratio of the level of the useful signal received by the first to the level of the useful signal received by the second, decisive device 8 (Fig. 8).

17. Determination by device 8 of the decisive direction of movement of the intruder:

- if the value of the ratio of the level of the useful signal received by the first to the level of the useful signal received by the second is more than unity, then the direction of movement of the intruder in the direction from CO (Fig. 3, 7);

- if the value of the ratio of the level of the useful signal received by the first to the level of the useful signal received by the second is less than unity, then the direction of movement of the intruder towards the CO (Fig. 3, 7).

18. Transmission by a passive optoelectronic detection means to the system 1 for collecting and processing information about the direction of movement of the intruder through the signaling interface 6 via the radio channel (Fig. 8).

19. When the alarm accumulation time (Δt) reaches its maximum value (T) and the second alarm signal is not received, the device 8 makes a decisive decision on the end of the signal accumulation (Fig. 7). The transmission through the signal interface 6 to the system 1 for collecting and processing information about whether the direction of movement of the intruder is not defined (Fig. 8).

20. Zeroing the memory of the memory device 7 (Fig. 8).

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

- FIG. 1 is a deployment diagram of one passive optical-electronic detection means in a known security monitoring method;

- FIG. 2 is a deployment diagram of two passive optoelectronic detection means in a known security monitoring method;

- FIG. 3 is a deployment diagram of a passive optoelectronic detection means in the proposed security monitoring method with size indication;

- FIG. 4 is a diagram of a detection zone of a passive optoelectronic detection means indicating dimensions (top view);

- FIG. 5 is a diagram showing the degree to which an intruder overlaps a detection zone of a passive optoelectronic infrared detection means (top view);

- FIG. 6 - table of ranges of speeds of the intruder in various parts of the terrain;

- FIG. 7 - table (algorithm) for deciding on the direction of movement of the intruder through the bend of the road;

- FIG. 8 is a structural diagram of the relationship of the devices used when implementing the security monitoring method.

The technical result consists in obtaining the ability to determine the direction of movement of the detected intruder using only one WITH.

Information sources

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

2. Korshnyakov V.G. Signaling means of protection of local areas: uc. allowance / V.G. Korshnyakov - Kaliningrad: KPI of the FSB of the Russian Federation, 2004 .-- 135 p.

3. Marshalov T.A. Technical means of border protection: textbook / T.A. Marshalov, A.V. Gustov, I.M. Potapov. - Kaliningrad: KPI of the FSB of the Russian Federation, 2009 .-- 568 p.

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

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

6. Balenko S.V. Survival School. - M .: 1994. - 140 p.

Claims (1)

A security monitoring method using a passive optical-electronic detection means, which consists in monitoring the bending of the road with one passive optical-electronic detection means; in ensuring registration by a system for collecting and processing information of signals from a detection means, characterized in that the detection means is deployed so that its detection zone crosses the road in two sections on both sides of the road bend point, the section closest to the detection means is at a distance of 10 to 15 meters from the detection means, the section farthest from the detection means was at a distance from it equal to 60-80 percent of the maximum length of the detection zone; the detection means goes into alarm mode twice during the movement of the intruder through the bend of the road; sets the maximum value of the accumulation time of alarms based on the minimum possible speed of the intruder and the distance traveled between the sections of the intersection of the detection zone with the road; the detection means stores both levels of useful signals throughout the duration of the alarm modes; an algorithm is used to determine the direction of movement of the intruder relative to the detection means by the value of the ratio of the level of the useful signal received by the first to the level of the useful signal received by the second - more than one or less than one; the detection means transmits to the information collection and processing system a signal about the direction of the intruder's movement: the intruder moves toward the detection means or the intruder moves away from the detection means.

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