RU2485595C2 - Method of increasing accuracy of indicating point of intrusion using detachable detection means - Google Patents

Abstract

FIELD: information technology.

SUBSTANCE: method consists in analytical calculation of the point of intrusion based on the recorded time delay in arrival of alarm signals from three detachable linear parts deployed on an area as a single secure boundary with given geometric dimensions. The method includes a preparatory step for deploying linear parts of detachable means of detection with orientation thereof on the area and relative each other on a set scheme and the main step which begins from the moment an intruder crosses the secure boundary. During the main step, time intervals between alarm signals when the linear parts are broken are recorded, and the point of intrusion is calculated with indication thereof on the scheme based on relationships between the measured time intervals and known geometric dimensions of the secure boundary.

EFFECT: high accuracy of determining the point of intrusion with detachable means of detection in real time, remotely and automatically.

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Description

The invention relates to methods for remote security monitoring of the area and can be used in cases of application of security means with a linear part of a discontinuous principle of operation (discontinuous detection means) [1, 2].

The use of alarm guards increases the likelihood of detecting violators. Security units widely use relatively inexpensive and easy-to-use disruptive detection tools in local areas. In many respects, the success of the detention of the violator depends on the time spent by the security forces in searching for the place where the linear part is cut off. Explosive detection tools have low detection accuracy equal to the length of the unfolded linear part (0.75-2 km), therefore, the time taken to clarify the location of the violation is significant [3, 4].

A known method of using discontinuous detection means, which consists in deploying a discontinuous linear part across the probable direction of movement of the intruder. In the case of receiving a signal about the breakage of the linear part of the security force, moving along it, visual inspection determines the breakage point, which is the place of violation (Fig. 1) [3, 4].

Also known is a method of determining the side in which the intruder moves, which consists in deploying at the guarded boundary two breakaway linear parts located parallel to each other at a distance of 25-50 meters. The side in which the intruder moves is determined by the order of receipt of the alarm signal from the linear parts (figure 1).

The disadvantages of these methods are:

1. Significant time delay between receiving a violation signal and determining the location of the violation.

2. The need to attract additional forces for a visual inspection of the linear parts of the breakaway detection means.

The aim of the invention is to increase the efficiency of the use of explosive detection means.

To achieve this goal, a method has been developed to increase the accuracy of indicating the place of violation by breakaway detection means, which consists in analytical calculation of the place of violation according to the recorded delay time for the receipt of alarm signals from three breakaway linear parts deployed on the ground as a single signaling line of protection with specified geometric dimensions.

In the strip of terrain, parallel to the line to which the intruder is expected to enter, the signal line of protection is deployed. In most cases, when the intruder needs to overcome an open section of the terrain to reach his line, he will strive to enter it along the shortest path, that is, along the perpendicular (Fig. 1). It is legitimate to assume that the intruder, crossing the signal line 50-100 meters deep, moves almost without acceleration [5, 6]. The ratio of the distances traveled by him between the three linear parts, and the ratio of the time intervals spent on this, will be directly proportional to:

where t _1-2 , t _2-3 - time intervals spent by the intruder to overcome the distances between adjacent breakaway linear parts, s;

S _1-2 , S _2-3 - the distance between adjacent breakaway linear parts perpendicular to the linear parts No. 1, 2, traveled by the intruder, m;

V _H - the speed of the offender through the security line, m / s.

The geometric dimensions of the guard line are set so that the ratio of the time intervals between the violation of the first - second (t _1-2 ) and second - third (t _2-3 ) linear parts are different and depend on the specific location of the violation (figure 2) [7] ].

For this, the first and third (extreme) linear parts are deployed across the possible direction of movement of the intruder in parallel to each other, and the second linear part is between them at an angle of 4-9 degrees. Knowing the ratio of the distances between adjacent linear parts along the entire length of the alarm line of protection, comparing them with the ratio of the measured time intervals, and taking into account the sequence of operation of the linear parts, the place of violation is specified.

If the intruder crosses the alarm line of the guard, starting from the side of the linear part No. 1, then the time interval t _{1-2 is} recorded from the moment of the alarm from the linear part No. 1 until the alarm from the linear part No. 2. The time interval t _{2-3 is} recorded from the moment of receipt of the alarm signal from the linear part No. 2 to the moment of the receipt of the alarm signal from the linear part No. 3 (figure 3). After the alarms come from all three linear parts, the break place is calculated by the formula:

where H is the segment connecting the place (point) of the cliff of the linear part by the intruder and the vertex of the angle formed by the linear parts No. 1, 2 (2, 3), m;

g is a constant factor, depending only on the geometric dimensions of the guard line and calculated by the formula:

where S is the distance between the extreme (first and third) linear parts, m;

tgα is the tangent of the angle between adjacent linear parts.

k is the ratio between the first and second time intervals, calculated by the formulas:

If the intruder crosses the signal line, starting from the side of the linear part No. 3, then the time interval t _{3-2 is} recorded from the moment the alarm arrives from the linear part No. 3 until the alarm signal arrives from the linear part No. 2. The time interval t _{2-1 is} recorded from the moment of receipt of the alarm signal from the linear part No. 2 to the moment of the receipt of the alarm signal from the linear part No. 1. After the alarms come from all three linear parts, the place of the break by the intruder of the linear part is calculated by the formula (2).

The calculated length of the segment N is laid on the first of the triggered linear parts (No. 1 or No. 3) from the angle of its intersection with the linear part No. 2. Perpendicular to the linear parts No. 1 and No. 3 is laid through a point at the end of the segment.

The accuracy of the method is affected by the error in evaluating the actions of the intruder. The intruder does not always cross the guard line strictly perpendicularly. The uncertainty of the intruder’s actions can be described through a random angle of deviation from the perpendicular route of movement, which, according to the statistical models of the intruder, lies within 20 degrees from the main axis in both directions (Fig. 4) [8]. The accuracy of the proposed method for clarifying the place of violation can be estimated as the width of the strip, within which the coincidence of the ratio of time intervals is possible. This coincidence is random in nature and depends on the angle at which the deviation of the movement of the intruder occurs when moving from the first to third signaling lines (figure 4). The accuracy of the specified violation location ΔН, m, is calculated by the formula:

where β is a random angle of the maximum deviation of the intruder's movement route from perpendicular to the guard line, degrees.

Taking into account rounding up, the ΔН value lies within 40-70 meters, which is insignificant in comparison with the length of the boundary. Moreover, the erroneous route indicated by the analytical program does not go beyond the sector of a possible deviation of the movement of the intruder (Fig. 5).

The general formula for clarifying the place of calculation violation taking into account the inaccuracy of the method

Thus, the diagram graphically visualizes the place of violation of the guard line in the form of intersection points of a vector indicating the direction of movement of the intruder, with linear parts No. 1-3 and the interval showing the accuracy of the calculated location of the violation (Fig.6). Response forces are immediately put forward to the specified location of the violation indicated by the program, thereby eliminating the need to check the entire linear part before detecting the site of the cliff.

The method includes two stages: preparatory and main.

Preparatory stage:

1. Breakdown of the route of passage of the signal line of protection, the recommended geometric dimensions using theodolite, artillery compass, etc. [9].

2. The deployment on the ground signaling linear parts of three detachable detection means (Fig.7).

3. Marking the guard line along the length of two external signaling linear parts every 50 meters (Fig.7).

4. Drawing alarm linear parts on the scheme (map) of the area.

The main stage begins when the intruder tries to overcome the signal line of protection and includes (figure 3):

1. Registration of an alarm signal when an intruder overcomes the linear part No. 1 (No. 3) through a radio channel or a wired channel and the beginning of the countdown of the time interval t _1-2 (t _3-2 ) (Fig. 8, 9).

2. Registration of the alarm signal when the intruder overcomes the linear part No. 2, the end of the countdown of the first time interval t _1-2 (t _3-2 ), and the countdown of the second time interval t _2-3 (t _2-1 ).

3. Alarm registration when the intruder overcomes the linear part No. 3 (No. 1), the end of the second time interval t _2-3 count (t _2-1 ).

4. Substitution of the obtained time intervals into the analytical program for calculating Н and ΔН according to formulas (4) - (7).

5. A graphical representation of the program specified the place of violation on the diagram (map) (Fig.6).

The invention is illustrated graphic materials, where:

- figure 1 presents a diagram of the action of the security forces to search for and detain the intruder, depending on the method of application of the explosive detection means;

- figure 2 is a graphical explanation of the relationship of the distance traveled from a specific location of the violation;

- figure 3 is a sequence of processing signals from discontinuous detection means, the algorithm of the analytical program;

- figure 4 is a geometric justification of the measurement error introduced by the deviation from the perpendicular movement of the intruder;

- figure 5 - the recommended geometric dimensions of the guard line;

- Fig.6 is a representation of the result of clarifying the place of violation in the diagram;

- Fig.7 is a deployment diagram of the alarm line of protection;

- Fig.8 is a structural diagram of the collection, processing and display of information over the air;

- Fig.9 is a structural diagram of the collection, processing and display of information on a wired channel.

The technical result consists in:

1. A significant reduction in the time spent on clarifying the location of the violation.

2. Clarify the location of the violation remotely and automatically.

3. Clarification of the place of violation in real time.

Information sources

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

2. Korshnyakov V.G. and others. Alarm means of protection of local sites. Tutorial. - Kaliningrad: KPI of the FSB of the Russian Federation, 2004. - 135 p.

3. Alarm device of the breakaway type “Graphite”: Passport and user manual USDP.425112.001 PS. - Penza, 2003 .-- 19 p.

4. Ivanov I.V. The perimeter is the first line of security. - Security systems. - 1996. - No. 1.

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

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

7. Pogorelov A.V. Geometry. Textbook 7-11 classes. - M .: Education, 2010 .-- 175 p.

8. 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.

9. Balayan B.M. Laboratory work on the course "Topography with the basics of geodesy." - Kaliningrad: SE "KGT", 2000. - 224 p.

Claims (1)

The way to indicate the place of violation by means of breakaway detection means, which consists in monitoring a guard line on the ground simultaneously with several breakaway means of detection, characterized in that, in constructive execution of the guard line, the first and third linear parts of the detection means are deployed across the possible direction of movement of the intruder, and the second between them under angle of 4-9 °, while the place of violation is determined through a segment showing the removal of this place from the top of the intersection angle of the first and second or of the second and third linear parts and calculated by the algorithm according to the sequence of alarm signals from the three detection means, the values of the ratio of the time intervals of the delay of the arrival of signals between each other and a constant factor that depends only on the geometric dimensions of the guard.

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