RU2645598C1 - Method of security monitoring with the application of a linear radio-wave detector - Google Patents

Abstract

FIELD: monitoring systems.

SUBSTANCE: invention relates to security monitoring methods and can be used in cases of using a single linear radio wave detector for alarm control of a bending section of a road. In the method for monitoring the road bend by one detector, receiver and transmitter are deployed from opposite sides of the road bend point so that the detection zone of the detector crosses the road in two sections at the appropriate distance from the receiver and transmitter, while the cross-sectional areas of the first Fresnel zone in the sections differ, the direction of the intruder's movement is determined from the value of the ratio of the level of the desired signal that arrived first to the level of the desired signal that arrived second, the maximum value of the alarm accumulation time is set based on the minimum possible speed of the intruder and the distance it travels between the areas of intersection of the detection zone with the road, and a signal about the direction of the intruder's movement is transmitted to the information collection and processing system.

EFFECT: technical result consists in increasing the accuracy of monitoring by determining the direction of the movement of the intruder detected on the road, using only one detector.

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Description

The invention relates to methods for security monitoring of the terrain and can be used in cases where one linear radio wave detection means (CO) is used for signaling control of the road in the area where it has a bend.

Often the route of the intruder on the ground passes through the existing road network. Knowledge of the response forces, the direction of movement of the intruder is of great importance, since it allows you to significantly 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. In practice, to solve this problem, linear radio wave detection means are widely used, characterized by an extended detection zone (30) - from 50 to 200 meters [2, 3].

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

There is another method of security monitoring, which consists in controlling the road with two RMs; in ensuring the transmission of JI to the SSOI of alarm signals when an intruder crosses its AOR; the application of the algorithm for determining 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 is the inability to determine the direction of movement of the detected intruder.

The second specified method has the ability to determine the direction of movement of the intruder, however, for its implementation, the deployment of two RMs is necessary.

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

One of the most common elements of the road network is the bend of the road (an arched turn, curvature of the road - consisting of two adjacent straight sections of the road connected by a circular curve) [4, 5].

To achieve this goal, a security monitoring method has been developed, which consists in monitoring the bending of the road with one RM, in which the receiver (GTRM) and the transmitter (Rx) are deployed on opposite sides from the bend of the road so that the detection zone of the vehicle crosses the road in two sections; the distance from the PFP to the site nearest to it did not exceed 10 meters; the distance from the PRD to the site closest to it exceeded half the distance of the PRM-PRD by no more than 10 meters; the cross-sectional areas of the first Fresnel zone in the sections differed: the cross-sectional area in the section closest to the PFP was not less than two times smaller than the cross-sectional area in the section closest to the PFP; PFP twice generates an alarm when an intruder moves through a bend in the road; PfP CO records both levels of useful alarms throughout the duration of the alarm modes; an algorithm is used that determines the direction of movement of the intruder: from the PFM toward the PFD or from the PFP towards the PFM 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 maximum value of the accumulation time of alarm signals is set based on the minimum possible speed of the intruder and the distance traveled by him between the sections of the intersection of the detection zone with the road; PFP CO transmits to the information collection and processing system a signal on the direction of movement of the intruder (Fig. 3, 4).

It is known that the principle of operation of a linear radio wave detection means is based on the registration of a useful signal caused by the movement of the detection object (intruder) through its AO, at the input of the PFP. The useful signal level is higher if the intruder crosses the AO near the PfP (Rx) than if he crosses the AO closer to its middle. The useful signal is the amplitude-modulated oscillations of the radio waves emitted by the PFR and received by the PfP CO that occur when the intruder shuts it off. The level of the useful signal is determined by the modulation depth and depends on the degree of overlapping of the geometric dimensions of the SC by the body of the intruder [6].

It is also known that the AO means is limited to the region that is substantially involved in the process of propagation of radio waves, and is an ellipsoid of revolution between the receiver and the transmitter. The dimensions of this region are determined by the diameter of the first Fresnel zone, since the action of the remaining adjacent higher-order Fresnel zones is mutually compensated [7]. The cross-sectional area of the first Fresnel zone is different along the entire length of the SC: it has a maximum value of no further than 10 meters from the middle of the length of the SC, and a minimum of no more than 10 meters from the PFP (PF) of the CR (Fig. 5, 6) [2, 3].

where S _B '- sectional area of the first Fresnel zone at the nearest portion to the DWP, m ^2;

S _A 'is the cross-sectional area of the first Fresnel zone in the area closest to the PFP, m ² .

The cross-sectional area of the first Fresnel zone is defined as:

- in the area closest to the traffic control:

- in the area closest to the PfP:

where D _B 'is the diameter of the first Fresnel zone in the area closest to the PRD, m ² ;

D _A '- the diameter of the first Fresnel zone in the area closest to the PFP, m ² .

In turn, the diameter of the first Fresnel zone at the intersection of the ZO means with the road (Fig. 3):

- in the area closest to the traffic control:

- in the area closest to the PfP:

where L is the length of the CO, m ² ;

L _B 'is the distance from the Tx CO to the nearest section of the intersection of the AO means by the intruder, m;

L _A 'is the distance from the PfP CO to the nearest section of the intersection of the AO means by the intruder, m;

λ is the wavelength, m

In accordance with the proposed SO deployment scheme, the cross-sectional area of the first Fresnel zone in the section closest to the traffic control (no further than 10 meters from the middle of the GD) is at least 2 times S _B 'the cross-sectional area of the first Fresnel zone in the area no more than 10 meters from the PFP S _A '(Fig. 3, 6):

When moving through the AO CO, the intruder closes the first Fresnel zone, a useful signal is recorded at the input of the PFP [8]. The degree of overlap is determined by the ratio of the intruder’s body area (Z) to the cross-sectional area of the first Fresnel zone S _B ′ (S _A ′). It is more at the intersection of the AO with the road closest to the receiver, and less at the site closest to the transmitter (Fig. 5, 7):

The level of the useful signal (U), ceteris paribus, the greater, the higher the degree of overlap of the first Fresnel zone with the detection object (intruder):

where U is the level of the useful signal, V;

S is the cross-sectional area of the first Fresnel zone, m ² ;

Z is the body area of the intruder, m ² .

Therefore, when deploying SD according to the proposed scheme, the level of the useful signal when the intruder moves through the section of the intersection of the AU with the road closest to the PfP will be higher than the level of the useful signal when the violator moves through the section of the intersection of the ZO and the road closest to the PX (Fig. 3):

where U _B 'is the level of the useful signal when the intruder moves through the section of intersection of the roadside with the road closest to the traffic control;

U _A 'is the level of the useful signal when the intruder moves through the section of intersection of the roadside with the road closest to the PfP.

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 (U ₁ ) to the level of the useful signal received by the second (U ₂ ) is more than one, then the direction of movement of the intruder from the side of the front end to the front end (direction AB) (Fig. 3, 4 ):

- 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 from the front end to the front end (direction IA) (Fig. 3, 4):

To eliminate the errors of the conclusion about the direction of movement of the detected intruder, the incoming alarms are received within the set alarm accumulation time Δt. The maximum value of the accumulation time of alarms (T) is determined 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, taking into account the safety factor 1, 2 (Fig. 3, 8):

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

A’O - 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 Pf, m;

ОВ ’- 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 traffic control, 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. 8) [4, 9].

The signal about the direction of movement of the intruder (the movement of the offender from the side of the front end to the front end or the movement of the intruder from the front to the front end) is transmitted to the front end via the information collection and processing system.

The 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. 9).

2. Deployment on a bend of the road according to the established proposed scheme of a detection tool, including: a transmitter 2 and a receiver, consisting of a signal receiving unit 3, an amplifier 4, a threshold device 5, an output 6 interface, a memory device 7, a decisive device 8 (FIG. 3, 9).

3. Determination of the maximum value of the accumulation time of alarms (T) and its recording in the memory device 7 (formula 12).

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

1. The formation of a useful signal at the input of the signal receiving unit 3, the amplification of the signal by the amplifier 4 and its receipt on the threshold device 5 (Fig. 9).

2. The formation of the device 5 threshold of the first alarm signal (Fig. 9).

3. Transmission of the alarm output 6 interface to the system 1 for collecting and processing information (Fig. 9).

4. The transmission of the control command of the device 5 to the threshold memory device 7 to record the level of the useful signal from the signal receiving unit 3 (Fig. 9).

5. The beginning of the recording by the device 7 of the memory of the level of the useful signal and the start of the countdown time of the accumulation of alarm signals (Δt) (Fig. 9).

6. The exit of the intruder from the SD WITH, the formation of the device 5 threshold alarm signal (Fig. 9).

7. The transmission of the command to control the device 5 to the threshold memory device 7 at the end of recording the level of the useful signal from the signal receiving unit 3, the end of the recording by the device 7 of the memory of the level of the useful signal (Fig. 9).

8. The transfer of information by the device 7 of the memory about the level of the useful signal received first to the device 8 decisive (Fig. 9).

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

10. The formation of a useful signal at the input of block 3 of the reception of signals, amplification of the signal by amplifier 4 and its receipt on the threshold device 5 (Fig. 9).

11. The formation of the device 5 threshold of the second alarm signal (Fig. 9).

12. Transmission of the second alarm output 6 interface to the system 1 for collecting and processing information (Fig. 9).

13. The transmission of the control command of the device 5 to the threshold memory device 7 to record the level of the useful signal from the signal receiving unit 3 (Fig. 9).

14. The beginning of the recording device 7 memory level of the useful signal received by the second (Fig. 9).

15. The exit of the intruder from the SD WITH, the formation of the device 5 threshold alarm signal (Fig. 9).

16. Transmission of the device control command 5 to the threshold memory device 7 at the end of recording the useful signal level coming from the signal receiving unit 4, and the end of the alarm accumulation time countdown (Δt), the end of the recording of the useful signal level memory device 7 and the alarm accumulation time counting (Δt) (Fig. 9).

17. The transfer of information by the device 7 of the memory about the level of the useful signal received by the second, and the values of the time of accumulation of alarms (Δt) to the device 8 decisive (Fig. 9).

18. 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. 9).

19. The device 8 determines 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 from the receiver to the side of the transmitter (direction AB) (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 from the transmitter to the side of the receiver (direction VA) (Fig. 3, 7).

20. The signal transmission about the direction of movement of the intruder by the receiver of the detection means through the output 6 interface to the system 1 for collecting and processing information (Fig. 9).

21. 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 to end the signal accumulation (Fig. 6). Transmission through the output 6 interface to the system 1 for collecting and processing information of a signal indicating that the direction of movement of the intruder is not defined (Fig. 9).

22. Zeroing the memory of the device 7 memory (Fig. 9).

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

- FIG. 1 is a deployment diagram of one linear radio wave detection means in a known security monitoring method;

- FIG. 2 is a deployment diagram of two linear radio wave detection means in a known security monitoring method;

- FIG. 3 is a deployment diagram of a linear radio wave detection means in the proposed security monitoring method with size indications;

- FIG. 4 - decision table (withdrawal algorithm) about the direction of movement of the intruder through the bend of the road;

- FIG. 5 is a diagram of a ratio of the size of the intruder and the cross-sectional area of the first Fresnel zone of the detection zone;

- FIG. 6 is a table of typical sizes of a detection area of linear radio wave detection means;

- FIG. 7 is a diagram showing the degree to which an intruder overlaps a detection zone of a linear radio wave detection means depending on where it intersects (top view);

- FIG. 8 is a table of ranges of speeds of the intruder in various parts of the terrain;

- FIG. 9 is a structural diagram of the relationship of the devices used in the implementation of the method.

The technical result consists in obtaining the ability to determine the direction of movement of the intruder detected on the road, using only one CO.

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. Ganshin V.N., Khrenov V.S. Tables for the breakdown of circular and transitional lines. - K .: 1974. - 432 p.

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

7. Dolukhanov M.P. Radio wave propagation: Textbook - M .: Svyazizdat, 1960. - 391 p.

8. Nikitin N.V., Malemin S.G. The use of radio waves and combined detectors in order to increase the detecting ability and noise immunity. Methodical manual (R 78.36.022-2013). - M.: Research Center "Protection", 2012. - 120 p.

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

Claims (1)

A security monitoring method using a linear radio wave detection means, comprising monitoring a road with one linear radio wave detection means, generating an alarm detection means by the receiver when the intruder crosses the detection zone, and providing an alarm signal from the receiver to an information collection and processing system, characterized in that the detection is deployed on a section of the road where it has a bend, the receiver and transmitter of the detection means are deployed against the opposite sides of the bend point of the road so that the detection zone of the vehicle crosses the road in two sections, the distance from the receiver to the section nearest to it does not exceed 10 meters, the distance from the transmitter to the section closest to it exceeds half the receiver-transmitter distance by no more than 10 meters, and the cross-sectional areas of the first Fresnel zone in the sections were different: the cross-sectional area in the section closest to the receiver was not less than two times smaller than the cross-sectional area in the section closest to the transmitter, the receiver had two forms it generates an alarm signal when the intruder moves through the bend of the road, and the receiver of the detection means records both levels of useful alarms during the entire duration of the alarm modes, using an algorithm that determines the direction of movement of the intruder: from the receiver to the transmitter or from the transmitter to the receiver by value 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 maximum value of time is accumulated I alarms set on the basis of the minimum possible speed of the intruder and the distance traveled between them detection zone crossing portions with the road, the detection means transmits a receiver system for collecting and processing the information signal about the direction of motion of the intruder.

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