RU2648210C1 - Method of security monitoring of road fork with the use of a linear radio-wave detection means - Google Patents

Abstract

FIELD: security systems.

SUBSTANCE: invention relates to methods of security monitoring of the area and can be used in cases of signaling control of a road fork by a single linear radio wave detection means (DM). Method consists in deploying the DM at the fork of the three roads according to the scheme, in which its DA crosses two roads; providing a scheme for deploying a means for allocating a useful signal with different modulation depths at the receiver when the intruder crosses the DA: signal in the form of a single negative ejection of a large depth of modulation when an intruder crosses DA near the receiver or a signal in the form of a sequence of alternating positive and negative emissions of a small depth of modulation – when crossing the middle of the DA; placing the receiver at a distance of no more than 5–10 meters from one road, the transmitter at a distance equal to half the length of the DA (±10 meters) from another road; subsequent control of the road fork; the formation of an alarm signal by a large threshold block when an intruder crosses the DA near the receiver; formation of an alarm signal by blocks of small and positive thresholds when crossing the DA in the middle; transferring the receiver to a system for collecting and processing information (SCPI) of one or two alarm signals indicating the block of threshold that generated it; ensuring the reception of alarm signals from the receiver of the SCPI and accumulating them during the set time; application of the algorithm for determining the direction of the violator's movement through the fork of the three roads on the basis of comparing the data of the threshold block or the combination of blocks indicated by the detection means together with the alarm signal, with an a priori known scheme for deploying the detection means at the fork in the road. Method includes a preparatory stage with the deployment according to the established scheme of DM at the fork in the road and the main stage that begins with the crossing of the DA means and ends with the formation of an output about the direction of the violator's movement.

EFFECT: technical result consists in increasing the accuracy of determining the directions of the violator's movement detected at the fork in the road, using only one DM (two of the six directions are determined separately and four directions in pairs).

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Description

The invention relates to methods for security monitoring of the terrain and can be used in cases of signaling control of a fork in the road with one linear radio wave detection means (CO).

Often the route of the intruder on the ground passes through the existing road network. Knowledge by the reaction forces of 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 (AO) - from 50 to 200 meters [2, 3].

One of the most common elements of the road network is a fork in the road (three adjacent straight sections of the road converging at one common point) [4, 5].

There is a method of security monitoring, consisting in the deployment of CO at the fork of three roads according to the scheme in which its DA crosses two roads; subsequent control by means of a fork in the road; formation and transmission by the receiver (PFP) of the alarm means when the intruder crosses his DZ to the information collection and processing system (SSOI); ensuring reception of alarms from the PFR of the SSOI means and their accumulation during the set time; the application of the algorithm for determining the direction of movement of the offender by the number of incoming alarms from the CO (Fig. 1, 2) [2, 3].

There is another way of security monitoring, consisting in the deployment of two roads in the fork of two roads with the scheme in which the AO of each of them crosses one of the three roads; subsequent control by means of a fork in the road; the formation and transmission by the receiver (PFP) of each alarm means when the intruder crosses its DZ to the information collection and processing system (SSOI); ensuring the reception of alarms from PfP of the SSOI means and their accumulation during the set time; the application of the algorithm for determining the direction of movement of the offender by the number and sequence of receipt of alarms from the CO (Fig. 3, 4) [2, 3].

The disadvantage of the first specified method is the low accuracy of determining the direction of movement of the intruder (two of the six directions of movement are determined in pairs, and the four remaining ones are determined by the group) (Fig. 2).

The second specified method has a higher accuracy in determining the direction of movement of the intruder (two of the six directions of movement are determined separately and four directions are determined in pairs), however, for its implementation it is necessary to deploy two SDs (Fig. 4).

The aim of the invention is to improve the accuracy of determining the directions of movement of the intruder, found at the fork in the road, using only one WITH.

To achieve this goal, a security monitoring method has been developed, which consists in deploying JI at the fork of three roads according to the scheme in which its road crossing two roads; providing the deployment circuit with a means for extracting a useful signal with different modulation depths in the PFM when the intruder crosses the AO: a signal in the form of a single negative ejection of a large modulation depth when the intruder crosses the AO near the PF or a signal in the form of a sequence of alternating positive and negative emissions of a small modulation depth - at the intersection of the middle DA; placing the PFP means at a distance of not more than 5-10 meters from one road, the transmitter (PX) - at a distance equal to half the length of the roadside (± 10 meters) from the other road; subsequent control by means of a fork in the road; the formation of an alarm by a large threshold block when an AO means is crossed by an intruder near the PfP; the formation of an alarm by blocks of a small and positive threshold when the intruder crosses the AE in the middle; transmitting the PfP funds to the SSOI of one or two alarms indicating the threshold block that formed it; ensuring the reception of alarms from the PFP means of the SSOI and their accumulation during the set time; the application of the algorithm for determining the direction of movement of the intruder through the fork of three roads on the basis of comparing data on the threshold block or combination of blocks indicated by the detection means together with the alarm signal with the a priori known deployment scheme of the detection means on the fork in the roads (Fig. 5, 6).

It is known that the principle of operation of a linear radio-wave detection means is based on recording the PFR of changes in the signal emitted by the PFR and received by the PFM caused by the movement of the detection object (intruder) through its SC. These changes are amplitude-modulated oscillations of radio waves that occur when an interlocutor shuts off a DZ medium [6, 7]. The signal is fed to the PFP input, where it is amplified and filtered. The detector, which is part of the PFP, emits a useful signal. The amplitude (modulation depth) and temporal (waveform) characteristics of the useful signal are analyzed and, if they match the “intruder” model in the processing algorithm (exceeding threshold levels), an alarm is generated. The depth of modulation and the shape of the useful signal depend on the degree of overlap of the geometric dimensions of the GS by the body of the intruder. With complete (significant) overlapping by the intruder of the AE, the useful signal is a single negative outlier of a large modulation depth (Fig. 7). With a partial overlap of the SC by the intruder, the useful signal is a sequence of alternating positive and negative emissions of a small modulation depth (Fig. 8). The analysis of the modulation depth of the useful signal is carried out according to three threshold levels:

- the positive threshold block is triggered when the useful signal is positively modulated;

- a small threshold block is triggered at a shallow depth of negative modulation;

- a large threshold block is triggered when there is a large depth of negative modulation.

An alarm signal is generated when a large threshold block or small and positive threshold blocks are triggered (Fig. 9) [8-10].

It is also known that the AO means is limited to the region 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 GD: it has a maximum value in the middle of the GD (± 10 m), and a minimum near the PFP (TG) CO (5-10 m) (Fig. 5, 10) [6, 11] .

where S _B 'is the cross-sectional area of the first Fresnel zone in the middle of the GZ (± 10 meters), m ² ;

S _C '- sectional area of the first Fresnel zone near the PFP, m ² .

The diameter of the first Fresnel zone at the intersection of the ZO means with the road is defined as (Fig. 5):

- in the middle of the center (± 10 meters):

- near PfP:

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

L _B 'is the distance from the PRD WITH to the middle of the AO means (± 10 meters), m;

L _C 'is the distance from PFP CO to the intersection of the roadside with the road, m;

λ is the wavelength, m

In turn, the cross-sectional area of the first Fresnel zone will be equal to:

- in the middle of the center (± 10 meters):

- near PfP:

where D _B 'is the diameter of the first Fresnel zone in the middle of the GZ (± 10 meters), m ² ;

D _C '- the diameter of the first Fresnel zone near the PFP, m ² .

When moving through the AO CO, the intruder closes the first Fresnel zone, the PRM means registers a useful signal [7]. 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 _C '). In the middle of the GD, it is smaller, near the PFP, it is larger and approximately equal to unity (Fig. 11):

The shape of the useful signal and the depth of its modulation, ceteris paribus, is determined by the degree of overlap of the first Fresnel zone with the detection object (intruder).

Thus, when the intruder crosses the DZ means near the PFP, the useful signal form is a single negative outlier of a large modulation depth, and the alarm is generated by a large threshold block (Fig. 7, 9).

When the intruder crosses the means in the middle, the shape of the useful signal is a sequence of alternating positive and negative emissions of small depth of modulation, and the alarm is generated by blocks of small and positive thresholds (Fig. 8, 9).

According to the proposed method, the PFP means transmits an alarm to the SSOI indicating the block (s) of the threshold that generated it (the alarm is generated by the large threshold block or the alarm is generated by small and positive threshold blocks).

In accordance with the proposed CO deployment scheme, when an intruder moves through a fork on the road in the direction of NE or AC, two alarms are received at the SSOI. When the intruder moves in the directions of AC or CA or AB or VA, one alarm signal is received at the SSOI.

Based on a comparison of the data on the combination of threshold blocks indicated by the CO with the alarms during the set accumulation time of the alarm signals with the known deployment scheme of the CO, we can conclude the direction of movement of the detected intruder:

- the first alarm is a block of a large threshold, the second is a block of small and positive thresholds, the intruder moves from the side of the front end to the front end (direction of ST) (Fig. 5, 6);

- the first alarm signal is the blocks of small and positive thresholds, the second is the block of the large threshold, the intruder moves from the front end to the front end (direction ST) (Fig. 5, 6).

When a single alarm occurs and the alarm accumulation time reaches its maximum value, a conclusion about the direction of movement of the detected intruder is made based on a comparison of the data on the threshold block indicated by the CO together with the alarm with the known CO deployment circuit:

- alarm - a large threshold block, the intruder moves across the road near the PfP (direction of SA or AC) (Fig. 5, 6);

- alarm - blocks of small and positive thresholds, the intruder moves across the road in the middle of the AO (direction VA or AB) (Fig. 5, 6).

In order to eliminate errors in inferring the direction of movement of the detected intruder, the SSIR accumulates alarms during the set alarm accumulation time Δt after the first signal arrives. 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 of 1.2 (Fig. 5, 12):

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

S'O is the distance between the convergence point of the fork roads and the intersection of the ZO means with the road near the PfP, m;

OV '- the distance between the convergence point of the fork roads and the intersection of the middle of the AU means with the road, 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. 12) [4, 12].

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. 13).

2. Deployment at the fork in the road according to the established scheme of detection means, which includes a transmitter 2 and a receiver, consisting of an amplifier 3, a band-pass filter 4, a detector 5, a large threshold block 6, an output interface 7, a small threshold block 8, a positive threshold block 9 (Fig. 5, 13).

3. Calculation and recording in the memory of the system 1 for collecting and processing information the maximum value of the accumulation time of alarm signals (T) (formula 7).

4. Compilation and recording in the system 1 of collecting and processing information of the output algorithm (decision table) on the direction of movement of the detected intruder.

The main stage begins when the intruder moves through the fork in the road and crosses the AO means, it includes the following.

1. The selection of the detector 5 from the signal received at the input of the receiver, amplified by the amplifier 3 and filtered by a band-pass filter 4 of the useful signal (Fig. 13).

2. Analysis of the modulation depth of the useful signal from the detector 5 to the blocks 6 of the large threshold, 8 small threshold, 9 positive threshold (Fig. 13).

3. The formation of an alarm by block 6 of a large threshold with a useful signal in the form of a single negative spike of a large modulation depth; the alarm is generated by blocks 8 of small and 9 positive thresholds with a useful signal in the form of a sequence of alternating positive and negative emissions of a small modulation depth, depending on the point of intersection of the AO by the intruder (Fig. 13).

4. Transmission of the alarm signal indicating the block (s) of the threshold that formed it with the output 7 interface to the system 1 for collecting and processing information (Fig. 13).

5. The reception by the system 1 of the collection and processing of information of the first alarm signal starts the countdown of the alarm accumulation time (Δt) in it (Fig. 13).

6. The intruder’s exit from the ZO means, the formation of the standby signal by the CO receiver and its transmission to the information collection and processing system 1 (Fig. 13).

7. A possible second in a row crossing by the intruder AOR SO (the direction of movement of the offender NE or AC).

8. Isolation by the detector 5 of the signal received at the input of the receiver amplified by amplifier 3 and filtered by a band-pass filter 4 of the useful signal (Fig. 13).

9. Analysis of the modulation depth of the useful signal from the detector 5 to the blocks 6 of the large threshold, 8 small threshold, 9 positive threshold (Fig. 13).

10. The second alarm is generated by blocks 8 of small and 9 positive thresholds with a useful signal in the form of a sequence of alternating positive and negative emissions of a small modulation depth; the formation of the second alarm by block 6 of a large threshold with a useful signal in the form of a single negative ejection of a large modulation depth, depending on the point of intersection of the AO by the intruder (Fig. 13).

11. Transmission of the second alarm signal indicating the block (s) of the threshold that formed it with the output 7 interface to the information collection and processing system 1 (Fig. 13).

12. The reception by the system 1 of the collection and processing of information of the second alarm signal and the end of the countdown in it of the accumulation time of the alarm signals (Δt) (Fig. 13).

13. The exit of the intruder from the SD of the CO, the formation by the receiver of the CO of the standby signal and its transmission to the system 1 for collecting and processing information (Fig. 13).

14. The system 1 determines the collection and processing of information of the direction of movement of the intruder through the fork in three roads based on a comparison of data on the combination of threshold blocks indicated by the alarm system together with alarms with a known deployment scheme of the security system:

- the first alarm is a block of a large threshold, the second is a block of small and positive thresholds, the intruder moves from the side of the front end to the front end (direction of ST) (Fig. 5, 6);

- the first alarm signal is the blocks of small and positive thresholds, the second is the block of the large threshold, the intruder moves from the front end to the front end (direction ST) (Fig. 5, 6). 13.

15. When one alarm occurs and the alarm accumulation time (Δt) reaches its maximum value (T), the end of alarm accumulation by the information collection and processing system 1.

16. The system 1 determines the collection and processing of information of the direction of movement of the intruder through the fork of three roads on the basis of comparing data on the threshold block indicated by the CO with an alarm with a known deployment scheme of CO:

- alarm - a large threshold block, the intruder moves across the road near the PfP (direction of SA or AC) (Fig. 5, 6);

- alarm - blocks of small and positive thresholds, the intruder moves across the road in the middle of the AO (direction VA or AB) (Fig. 5, 6).

17. Zeroing the memory of the system 1 for collecting and processing information (Fig. 13).

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 method;

- FIG. 2 - output algorithm (decision table) on the direction of the offender through the fork in the known method;

- FIG. 3 is a deployment diagram of two linear radio wave detection means in a known method;

- FIG. 4 - output algorithm (decision table) on the direction of the offender through the fork in the known method;

- FIG. 5 is a deployment diagram of a linear radio wave detection means in the proposed method with dimensions;

- FIG. 6 - output algorithm (decision table) on the direction of movement of the detected intruder;

- FIG. 7 is a diagram of a useful signal in the form of a single negative ejection of a large modulation depth;

- FIG. 8 is a diagram of a useful signal in the form of a sequence of alternating positive and negative emissions of a shallow modulation depth;

- FIG. 9 is a table of correspondence between the intersection of the detection zone of the means by the intruder, the modulation depth of the useful signal and the block generating the alarm;

- FIG. 10 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. 11 is a table of typical sizes of the detection zone of linear radio wave detection means and the degree of its overlap by the intruder;

- FIG. 12 is a table of ranges of speeds of the intruder in various sections of the terrain;

- FIG. 13 is a structural diagram of the relationship of the devices used in the implementation of the method.

The technical result consists in increasing the accuracy of determining the directions of movement of the intruder detected at the fork in the road, using only one CO (two of the six directions are determined separately and four directions are determined in pairs).

Information sources

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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.

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8. Announcer security linear radio wave "Tantalum - 200 - 01". Operation manual (USDP.425142.031 RE). - Penza: Yumirs. - 33 p.

9. Announcer security linear radio wave "RM - 150". Operation manual (USDP.425142.020 RE). - Penza: Yumirs. - 33 p.

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Claims (1)

A security monitoring method for a fork in a road using a linear radio wave detection means, which consists of deploying a detection means at a fork in three roads according to a scheme in which its detection zone crosses two roads; subsequent control by means of a fork in the road; formation and transmission by the receiver of the alarm means when the intruder crosses his detection zone to the information collection and processing system; providing reception of alarms from the receiver of the system by the system of collecting and processing information and accumulating them for a set time, characterized in that the deployment scheme of the means provides a useful signal with different modulation depths in the receiver when the intruder detects the detection zone: a signal in the form of a single negative ejection is large modulation depth when the intruder crosses the detection zone near the receiver or signal in the form of a sequence of alternating positive and itsatelnyh small modulation depth emissions - when crossing the middle of the detection zone; the device’s receiver is located at a distance of no more than 5-10 meters from one road, the transmitter is located at a distance equal to half the length of the detection zone (± 10 meters) from another road; the formation of an alarm by a large threshold block when crossing the detection zone of an agent by an intruder near the receiver; alarm generation by blocks of small and positive threshold when the intruder crosses the detection zone in the middle; the receiver of the tool transmits one or two alarms with an indication of the threshold block that generated it to the information collection and processing system; an algorithm is used to determine the direction of movement of the intruder through the fork of three roads based on a comparison of data on the threshold block or combination of blocks indicated by the detection means together with the alarm signal with the a priori known deployment scheme of the detection means on the fork in the roads.

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