A method and system for detecting intrusion based on a dual-MZ interferometer

Abstract

The application provides a kind of optical fiber intrusion detection method and system based on double MZ interferometer, it is related to optical fiber intrusion detection field.Acquire the medium of multiple perimeter, according to the medium division defense area, and mark the range of perimeter of any defense area, each defense area is provided with corresponding detector;Set the alarm parameter of each defense area corresponding detector;Draw the defense area corresponding relation table indicating the defense area range corresponding to the defense area, detector and alarm parameter configuration corresponding relation, and carry out intrusion detection;When the intrusion signal detected by detector meets alarm parameter, early warning is carried out;Obtain the positioning information of the place where invasion occurs;According to the detector of early warning, positioning information and defense area corresponding relation table, determine the defense area corresponding to the invasion event, the defense area corresponding to the detector of early warning and positioning information is consistent, then output alarm and positioning information.The alarm parameter of detector in defense area is set according to the characteristics of medium, so that the alarm parameter of detector in defense area is adapted to corresponding medium, so as to reduce false alarm rate and false negative rate.

Description

Technical Field

[0001] This invention relates to the field of fiber optic intrusion detection, and more specifically, to a fiber optic intrusion detection method and system based on a dual MZ interferometer. Background Technology

[0002] Fiber optic intrusion detection systems are a common type of perimeter security system. They utilize optical fibers as sensors, attaching cables to wire mesh, walls, or laying them underground to detect vibration signals caused by intrusion events. Digital signal processing technology is then used to analyze these signals and determine if an intrusion alarm has been triggered. Location-based fiber optic intrusion detection systems are security systems capable of analyzing and identifying various intrusion behaviors and pinpointing the intrusion location. The technical principles behind location-based systems fall into two categories: one based on Rayleigh scattering technology, and the other based on the principle of a dual Mach-Zehnder interferometer.

[0003] Fiber optic intrusion detection systems based on the dual Mach-Zehnder principle offer excellent detection sensitivity and low design costs, giving them a competitive edge in the market. These systems typically employ a bidirectional interferometer, with one detector covering the entire perimeter. However, in perimeters composed of multiple media (such as wire mesh, wrought iron fences, and walls), the alarm parameters configured for a single detector are difficult to apply simultaneously to various media, leading to high false alarm and false negative rates. Summary of the Invention

[0004] To address the aforementioned issues, this invention provides a fiber optic intrusion detection method and system based on a dual MZ interferometer. By setting corresponding protection zones for each medium and equipping each zone with a detector, the problem of not being able to set alarm parameters with varying detection sensitivity based on the different media within the perimeter can be solved.

[0005] The present invention is implemented as follows: In a first aspect, this application provides a fiber optic intrusion detection method based on a dual MZ interferometer, which includes the following steps: acquiring multiple media constituting a perimeter, dividing the perimeter into zones according to the media, and marking the perimeter range of any zone, with a corresponding detector set in each zone; setting alarm parameters for the detectors corresponding to each zone; drawing a zone correspondence table representing the correspondence between the zone range, detectors, and alarm parameter configurations, and performing intrusion detection; issuing an early warning when the intrusion signal detected by the detector meets the alarm parameters; acquiring the location information of the intrusion location; determining the zone corresponding to the intrusion event based on the detector, location information, and zone correspondence table, and outputting an alarm and location information if the zone corresponding to the detector and location information are consistent.

[0006] Furthermore, based on the above scheme, for the same type of medium, the alarm parameters of the corresponding detector in the protection zone where the medium is located are set according to the noise in its environment.

[0007] Furthermore, based on the above scheme, the steps for determining the zone corresponding to the intrusion event according to the detector, location information, and zone correspondence table of the early warning, and outputting alarm and location information if the zones corresponding to the detector and location information are consistent, are as follows: compare the location information with the zone correspondence table to determine the zone corresponding to the location data, then compare the detector that generated the early warning with the zone correspondence table to determine the zone corresponding to the detector, compare the zone corresponding to the location information with the zone corresponding to the detector, and if the zones corresponding to the detector and location information are consistent, then output alarm and location information.

[0008] Furthermore, based on the above scheme, the steps for marking the perimeter of any defense zone are as follows: Divide the defense zone range sequentially according to the starting position of the perimeter. The range of the first defense zone is 0-X1, the range of the second defense zone is X1-X2, and the range of the Nth defense zone is X... N-1 -X N .

[0009] Furthermore, based on the above scheme, the zone correspondence table includes the zone number, the range corresponding to the zone, the alarm parameter configuration of the detector corresponding to the zone, and the detector number corresponding to the zone.

[0010] Secondly, this application provides a fiber optic intrusion detection system based on a dual MZ interferometer, comprising a zone division module for acquiring multiple media constituting a perimeter, dividing the perimeter into zones according to the media, and marking the perimeter range of any zone, with a corresponding detector set in each zone; an alarm parameter configuration module for setting alarm parameters for the detectors corresponding to each zone; a zone correspondence table drawing module for drawing a zone correspondence table representing the correspondence between the zone range, detectors, and alarm parameter configurations, and performing intrusion detection; an alarm module for issuing an early warning when the intrusion signal detected by the detector meets the alarm parameters; a location module for acquiring the location information of the intrusion location; and an arbitration module for determining the zone corresponding to the intrusion event based on the early warning detector, location information, and the zone correspondence table, outputting an alarm and location information if the zones corresponding to the detector and the location information are consistent.

[0011] Compared with the prior art, the present invention has at least the following advantages or beneficial effects:

[0012] The perimeter is divided into zones based on the different media that make up the perimeter, and the alarm parameters of the detectors in the zones are set according to the characteristics of the media, so that the alarm parameters of the detectors in the zones are adapted to the corresponding media, thereby reducing the false alarm rate and the missed alarm rate. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 A schematic diagram of the system architecture of a fiber optic intrusion detection method based on a dual MZ interferometer provided in an embodiment of the present invention;

[0015] Figure 2 The flowchart illustrates a fiber optic intrusion detection method based on a dual MZ interferometer, as provided in one embodiment of the present invention. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0017] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0018] Example

[0019] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the various embodiments and features described below can be combined with each other.

[0020] Please refer to Figure 1 and Figure 2This invention provides a fiber optic intrusion detection method based on a dual MZ interferometer, comprising the following steps: acquiring multiple media constituting a perimeter; dividing the perimeter into zones based on the media; marking the perimeter range of any zone; and setting a corresponding detector within each zone; setting alarm parameters for the detectors in each zone; drawing a zone correspondence table representing the correspondence between the zone range, detectors, and alarm parameter configurations, and performing intrusion detection; issuing an alert when the intrusion signal detected by the detector meets the alarm parameters; acquiring the location information of the intrusion location; determining the zone corresponding to the intrusion event based on the alerted detector, location information, and the zone correspondence table; and outputting an alarm and location information if the alerted detector and the zone corresponding to the location information match. Here, any medium refers to a continuous sequence of the same type of medium.

[0021] Existing technologies typically use one interferometer and one detector to cover the entire perimeter. Alternatively, they divide the perimeter into equally spaced zones, each with its own detector. Regardless of the number of zones, there is only one detector, and each detector has only one set of configuration parameters. In most cases, whether it's the entire perimeter or equally spaced zones, the media composing them are of multiple types. A single set of alarm parameters is difficult to apply to multiple media, leading to high false alarm and missed alarm rates. For example, adjusting a set of detector parameters to suit barbed wire media may result in no missed alarms and very few false alarms, achieving satisfactory results. However, this same set of parameters may not perform well for sections of wall media within the same perimeter, potentially resulting in many missed alarms. Therefore, in this embodiment, multiple media composing the perimeter are acquired, zones are divided according to the media, and the perimeter range of any zone is marked. Each zone is equipped with a corresponding detector. When an external object enters the vibrating area around the optical fiber, it causes vibration in the surrounding medium. Due to differences in the stiffness and density of the media, their ability to transmit vibrations also differs, therefore different alarm parameters are required for different media. This invention sets up corresponding protection zones for each medium, with one detector per zone. This allows alarm parameters to be configured according to the characteristics of the medium, thereby reducing false alarm and missed alarm rates.

[0022] The alarm parameters of the detector are preset, and an early warning is issued when the intrusion signal detected by the detector meets the alarm parameters;

[0023] Location information indicates the location where the intrusion occurred within the entire perimeter. For example, if the perimeter range is 1 km and the intrusion occurs 400 m from the perimeter starting point, the location information would be 400 m.

[0024] The alarm detector, location information, and zone correspondence table determine the zone corresponding to the intrusion event. If the zone corresponding to the detector and location information matches, an alarm and location information are output. The zone number, zone range, alarm parameter configuration, and detector correspondence are shown in the table below: (Note: The zone range can be set arbitrarily by the user.)

[0025] Table 1: Correspondence Table of Defense Zones

[0026] 1 0m~100m Configuration #1 #1 2 100m~200m Configuration #2 #2 3 200m~300m Configuration #3 #3 N (N-1)*100m~N*100m Configuration #N #N

[0027] Both zones and detectors are numbered, and the zone number matches the corresponding detector number, facilitating the identification of the detector within a zone. The zone range is marked in a table to easily determine the zone based on location information. For example, as shown in the user's zone correspondence table above, if detector #2 issues an alarm, the zone correspondence table matches the detector number with the zone number, indicating that the alarm was issued in zone 2. If the location information is 122m, the zone correspondence table compares this information with the zone range; 122m falls within the 100m-200m range, therefore the location information identifies zone 2. Since both the alarm and location information correspond to zone 2, and the zones match, both alarm and location information are output. If multiple detectors generate warnings and multiple location information are available, the zone number of the zone corresponding to the detector that generated the warning and the zone number of the zone corresponding to the location information are obtained by referring to the zone relationship correspondence table. If the zone numbers of the zones corresponding to multiple detectors that generated warnings and the zone numbers of the zones corresponding to the location information are the same, the alarm and location information are output sequentially.

[0028] When an intrusion occurs, at least one detector will generate an alert. If multiple detectors generate alerts simultaneously, each detector will be matched against the location information and the zone correspondence table. If the zone number of any detector generating an alert matches the zone number corresponding to the location information, an intrusion is determined to have occurred in that zone, and the information from the other detectors generating alerts is discarded. For example, when an intrusion occurs, multiple detectors generate alerts, namely detector #1, detector #2, and detector #3, while there is only one location information 125m. This location information corresponds to zone 2. Detector #1 corresponds to zone 1, detector #2 to zone 2, and detector #3 to zone 3. The zone corresponding to detector #2 matches the zone corresponding to the location information. Therefore, the alarm and location information corresponding to zone 2 are output, and the alert information generated by the other detectors is discarded.

[0029] In general, when an intrusion occurs, the locator acquires at least one location information. If the locator acquires multiple location information simultaneously, it matches each location information with the alarm detector and the corresponding zone table. When any location information matches the zone number of the alarm detector, it is determined that the alarm detector and the zone corresponding to the location information are consistent, and the remaining location information is discarded. For example, when an intrusion occurs, the timer detects multiple location information, namely 111m, 203m, and 301m, but only the detector corresponding to the zone with a range of 200m to 300m issues an alarm. In this case, the zone located by the 203m location information is consistent with the zone corresponding to that detector, an alarm is output along with the 203m location information, and the other location information is discarded.

[0030] In some embodiments of the present invention, for the same medium, alarm parameters of the corresponding detector in the protection zone where the medium is located are set according to the noise in its environment.

[0031] In the above embodiments, noise refers to unwanted, irregular, and useless information. In the entire fiber optic intrusion detection system, besides signals caused by intrusion, sunlight, lightning, and artificial light are all considered noise. For example, if someone climbs over a barbed wire fence, causing a warning from the detector corresponding to the fence's zone, the signal generated by climbing over the fence is a useful signal. If a car passes by, causing a warning from the detector corresponding to the fence's zone, the signal generated by the car is not a useful signal and is considered noise. Within the same medium, the amount and intensity of noise in the surrounding environment vary, and the sensitivity of the detectors is affected by noise to varying degrees. Therefore, even with the same medium, the detector sensitivity must be set according to the noise in its surrounding environment. If a section of the medium has a lot of surrounding noise, leading to more false alarms, the alarm parameters such as the sensitivity of the detectors corresponding to that section can be reduced to decrease false alarms. Conversely, if another section of the medium has less surrounding noise and fewer false alarms, the alarm parameters such as the sensitivity of the detectors corresponding to that section can be increased. This method of setting alarm parameters in segments can effectively reduce false alarms and missed alarms, improving the system's anti-interference level.

[0032] After installing the entire system, the user configures the detector's alarm parameters according to the characteristics of the medium. After configuring the alarm parameters, they then fine-tune them based on the noise level in the environment where the medium is located.

[0033] In some embodiments of the present invention, the step of marking the perimeter of any defense zone is as follows: The defense zone range is divided sequentially according to the starting position of the perimeter, with the range of the first defense zone being 0-X1, the range of the second defense zone being X1-X2, and the range of the Nth defense zone being X... N-1 -X N .

[0034] In the above embodiments, the range of a defense zone is equivalent to the location coordinates of the defense zone, which facilitates determining which defense zone the location in the positioning information belongs to. For example, if the range of defense zone 1 is 0-90m, the range of defense zone 2 is 90-200m, and the positioning information is 111m, then the defense zone corresponding to the positioning information is defense zone 2.

[0035] In some embodiments of the present invention, the zone correspondence table includes the zone number, the range corresponding to the zone, the alarm parameter configuration of the detector corresponding to the zone, and the detector number corresponding to the zone.

[0036] In the above embodiments, the zone correspondence table is set up to facilitate matching the detector number that issues the warning with the zone number to obtain the zone number of the zone that issued the warning, and to compare the location information with the zone range to obtain the zone number of the zone indicated by the location information. It also facilitates querying the alarm parameter configuration of the detector corresponding to the zone.

[0037] This invention provides a fiber optic intrusion detection system based on a dual-MZ interferometer, comprising: a zone division module for acquiring multiple media constituting the perimeter, dividing the perimeter into zones according to the media, and marking the perimeter range of any zone, with a corresponding detector set in each zone; an alarm parameter configuration module for setting alarm parameters for the detectors corresponding to each zone; a zone correspondence table drawing module for drawing a zone correspondence table representing the correspondence between the zone range, detectors, and alarm parameter configurations, and performing intrusion detection; an alarm module for issuing an early warning when the intrusion signal detected by the detector meets the alarm parameters; a location module for acquiring the location information of the intrusion location; and an arbitration module for determining the zone corresponding to the intrusion event based on the early warning detector, location information, and the zone correspondence table, outputting an alarm and location information if the zone corresponding to the detector and the location information match. By dividing the perimeter into zones according to different media and setting the alarm parameters of the detectors in the zones according to the characteristics of the media, the alarm parameters of the detectors in the zones are adapted to the corresponding media, thereby reducing the false alarm rate and the missed alarm rate.

[0038] DMZI is an abbreviation for Dual Mach-Zehnder Interferometer. It is an optical interferometer used for high-precision measurement of vibrations, displacements, and other physical phenomena.

[0039] The double MZ interferometer refers to the double Mach-Zehnder interferometer.

[0040] In summary, embodiments of the present invention provide a fiber optic intrusion detection method and system:

[0041] The system divides the perimeter into zones based on the different media that make up the perimeter, and sets the alarm parameters of the detectors in each zone according to the characteristics of the media. This ensures that the alarm parameters of the detectors in each zone are adapted to the corresponding media, thereby reducing the false alarm rate and the missed alarm rate. Furthermore, the sensitivity of the detectors is adjusted based on the amount and intensity of noise in the surrounding environment where the same medium is located, further reducing the false alarm rate and the missed alarm rate.

[0042] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this application. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A fiber optic intrusion detection method based on a dual MZ interferometer, characterized in that, Includes the following steps: Multiple media that make up the perimeter are acquired, defense zones are divided according to the media, and the perimeter range of any defense zone is marked. Each defense zone is equipped with a corresponding detector. Set the alarm parameters for the detectors corresponding to each zone; Draw a zone correspondence table showing the correspondence between the zone range, detectors, and alarm parameter configurations of the corresponding zones, and perform intrusion detection; When the intrusion signal detected by the detector meets the alarm parameters, an early warning is issued; Obtain the location information of the intrusion site; The intrusion event is determined based on the detector, location information, and the zone correspondence table. If the detector and location information correspond to the same zone, an alarm and location information are output.

2. The fiber optic intrusion detection method based on a dual MZ interferometer according to claim 1, characterized in that, For the same type of medium, the alarm parameters of the corresponding detector in the protection zone where the medium is located are set according to the noise in its environment.

3. The fiber optic intrusion detection method based on a dual MZ interferometer according to claim 1, characterized in that, The steps for determining the zone corresponding to an intrusion event based on the detector, location information, and zone correspondence table are as follows: If the zones corresponding to the detector and location information match, an alarm and location information are output. The location information is compared with the zone correspondence table to determine the zone corresponding to the location data. Then, the detector that generates the warning is compared with the zone correspondence table to determine the zone corresponding to the detector. The zone corresponding to the location information is compared with the zone corresponding to the detector. If the zones corresponding to the detector and the location information are consistent, an alarm and location information are output.

4. The fiber optic intrusion detection method based on a dual MZ interferometer according to claim 1, characterized in that, The steps for marking the perimeter of any defense zone are as follows: The defense zones are divided sequentially based on the starting position of the perimeter. The first defense zone extends from 0 to X. 1， The second defense zone extends from X1 to X2, and the Nth defense zone extends from X... N-1 -X N。 5. A fiber optic intrusion detection method based on a dual MZ interferometer according to any one of claims 1-4, characterized in that, The zone correspondence table includes the zone number, the range corresponding to the zone, the alarm parameter configuration of the detector corresponding to the zone, and the detector number corresponding to the zone.

6. A fiber optic intrusion detection system based on a dual MZ interferometer, characterized in that, include: The zone division module is used to acquire multiple media that make up the perimeter, divide the perimeter into zones according to the media, and mark the range of any zone within the perimeter. Each zone is equipped with a corresponding detector. The alarm parameter configuration module allows you to set the alarm parameters for the detectors in each zone. The zone correspondence table drawing module is used to draw a zone correspondence table that represents the correspondence between the zone range, detector and alarm parameter configuration of the zone and to perform intrusion detection; The alarm module is used to issue an early warning when the intrusion signal detected by the detector meets the alarm parameters; The location module is used to obtain the location information of the intrusion site; The arbitration module is used to determine the zone corresponding to the intrusion event based on the detector, location information and the zone correspondence table of the early warning. If the zone corresponding to the detector and the location information are consistent, an alarm and location information are output.

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