Infrared and visible light positioning mark for digital barrier field and use method of infrared and visible light positioning mark

Abstract

The invention discloses an infrared and visible light positioning mark for a digital barrier field and a use method thereof, and the infrared and visible light positioning mark comprises a hollow substrate, and further comprises a power supply module arranged in an inner cavity of the substrate, and a controller, a positioning module, a communication module, a heating module and a non-heating module which are arranged on the surface of the substrate; the surface of the base plate is divided into nine areas in the shape of nine squares, the heating modules and the non-heating modules in part of the areas are combined and coded to form identification codes through a two-dimensional code coding rule, and the device and the method can be used for digital obstacle farms, and passage detection of strip-shaped digital obstacles and burst point detection of ammunition in various environments are achieved.

Description

Technical Field

[0001] The present invention relates to the field of damage assessment technology, and in particular to infrared and visible light positioning markers for digital obstacle fields and a method for using the same. Background Art

[0002] A digital obstacle field refers to a combination of virtual and real obstacle fields constructed using digital twins, simulation, machine learning and other technologies. It is mainly used for landing obstacle clearance training to achieve accurate assessment of obstacle clearance efficiency, real-time display of obstacle clearance status, review and analysis of obstacle clearance actions, and virtual construction of large obstacles, accelerating the upgrade and transformation of landing obstacle clearance training.

[0003] Our unit has been granted patent CN113128891B, which discloses a digital obstacle field. The digital obstacles in this patent include digital rail forts, digital triangular cones, digital barbed wire, digital blocking walls, digital mines and digital blocking trenches, etc. Among them, digital barbed wire, digital blocking walls and digital blocking trenches are strip-shaped digital obstacles; in addition, strip-shaped digital obstacles also include: concertina wire, straight-pile wire, roof-type wire, sisal belt, etc. In the digital obstacle field, visible light images taken by an image acquisition unit (infrared and visible light cameras) carried by a drone are generally used to detect the path of strip obstacles, and the infrared images taken are used to detect the explosion point of obstacle-breaking ammunition. Due to the high flying altitude of the drone, the traditional visual positioning method has low accuracy when performing path detection and explosion point detection, and it is necessary to set a reference object on the ground to improve the detection accuracy. Summary of the invention

[0004] The purpose of the present invention is to provide an infrared and visible light positioning mark for a digital obstacle field and a method of using the same.

[0005] The innovative purpose of the present invention is to utilize the positioning module, the heating module, the non-heating module and the identification code in combination so that the image acquisition unit can accurately detect the path of the strip-shaped digital obstacle in both non-strong light and strong light environments; utilize the controllable heating temperature of the heating module to ensure that the positioning mark can be effectively identified in the infrared image, obtain the position information of the positioning mark, and realize the explosion point detection of the ammunition.

[0006] In order to achieve the above-mentioned object of the invention, the technical solution of the present invention is:

[0007] An infrared and visible light positioning mark for a digital obstacle field comprises a hollow substrate, and also comprises a power supply module, a controller, a positioning module, a communication module, a heating module and a non-heating module; the controller is connected with the power supply module, the positioning module, the communication module and the heating module; the power supply module is connected with the positioning module, the communication module and the heating module; a white low-emissivity coating is sprayed on the surface of the heating module, and a black coating is sprayed on the surface of the non-heating module; the surface of the substrate is divided into nine areas in a nine-square grid shape, which are area No. 1, area No. 2, ..., and area No. 9 from right to left and from bottom to top; the controller, the positioning module and the communication module are arranged in area No. 5 in the center; the heating module is arranged in area No. 1 and area No. 3; heating modules and non-heating modules are arranged in the remaining 6 areas according to the two-dimensional code encoding rules, thereby forming an identification code of the positioning mark; the power supply module is arranged in the inner cavity of the substrate.

[0008] Furthermore, the heating module includes an electrical connector and a concave base, and a heating layer and a heat-conducting layer are arranged in the inner cavity of the base; an electric heating wire is arranged in the heating layer, and the electric heating wire is connected to the controller through the electrical connector.

[0009] Furthermore, a heat insulating layer is arranged between the heating layer and the inner wall and bottom of the base.

[0010] A method for using infrared and visible light positioning markers for a digital obstacle field comprises the following steps:

[0011] S1: According to the two-dimensional code encoding rules, the combination of heating modules and non-heating modules in the No. 2 area, No. 4 area, No. 6 area, No. 7 area, No. 8 area and No. 9 area is encoded, and the area represents 1 if the heating module is installed, and 0 if the non-heating module is installed; a byte is used to represent the identification code, wherein the 7th and 8th bits of the byte are fixed to 0, the 6th bit corresponds to the No. 9 area, the 5th bit corresponds to the No. 8 area, the 4th bit corresponds to the No. 7 area, the 3rd bit corresponds to the No. 6 area, the 2nd bit corresponds to the No. 4 area, and the 1st bit corresponds to the No. 2 area, and 64 identification codes are obtained, which are No. 0 to No. 63 respectively;

[0012] S2: assign positioning marks to various strip-shaped digital obstacles in the digital obstacle field;

[0013] S3: assigning location marks to the explosion areas in the digital obstacle field;

[0014] S4: Arrange positioning marks;

[0015] S41: Arrange positioning marks for the strip-shaped digitized obstacles, and place the positioning marks allocated in step S2 at 2 meters on both ends of each corresponding strip-shaped digitized obstacle. When placing, the x-axis and y-axis of the positioning marks and the x-axis and y-axis of the digitized obstacle field have an x-axis angle of no more than 30 degrees;

[0016] S42: Arrange positioning marks for the explosion area, and place the positioning marks allocated in step S3 on both sides of the edge lines of the digitized obstacle field in the y-axis direction at intervals of 30 meters to 50 meters, and the x-axis and y-axis of the positioning marks and the x-axis and y-axis of the digitized obstacle field have an x-axis angle of no more than 30 degrees;

[0017] S5: Carry out identification of positioning markers according to different scenarios;

[0018] (1) Path detection of strip-shaped digital obstacles

[0019] In a non-strong light environment, the heating module and the non-heating module on the positioning mark are white and black respectively, and the positioning mark is identified by a visible light camera, the position information of the positioning mark is obtained, and the identification code information of the positioning mark is obtained according to the coding rule in step S1, and the collected position information and identification code information are directly applied in the visible light detection model to realize the path detection of the strip-shaped digital obstacle;

[0020] In a strong light environment, an infrared camera is used to identify the heating module on the positioning mark to obtain the position information of the positioning mark, and the identification code information of the positioning mark is obtained according to the coding rule in S1, and the position information and identification code information are sent to the visible light detection model to realize the path detection of the strip-shaped digital obstacle;

[0021] (2) Detection of the explosive point of ammunition

[0022] The controller is used to control the temperature of the heating module so that its surface temperature reaches the temperature level of the center of the explosion area, ensuring that the positioning mark can be effectively identified in the infrared image, obtaining the position information of the positioning mark, and obtaining the identification code information of the positioning mark according to the coding rule in S1, and sending the position information and identification code information to the infrared detection model to realize the explosion point detection of the ammunition.

[0023] Furthermore, the specific allocation of the positioning identifiers in steps S2 and S3 is as follows:

[0024] (1) For barrier walls, positioning markers with identification codes ranging from 0 to 7 are assigned and divided into 4 groups. 0 and 1 are group 1, 2 and 3 are group 2, and so on;

[0025] (2) Blocking trenches, with positioning markers numbered 8 to 15, divided into four groups. Numbers 8 and 9 are the fifth group, numbers 10 and 11 are the sixth group, and so on;

[0026] (3) For accordion-type wire mesh, the positioning markers with identification codes ranging from 16 to 23 are assigned and divided into 4 groups. No. 16 and No. 17 are the 9th group, No. 18 and No. 19 are the 10th group, and so on;

[0027] (4) For the straight-pile wire fence, the positioning markers with identification codes ranging from 24 to 31 are assigned and divided into 4 groups. No. 24 and No. 25 are the 13th group, No. 26 and No. 27 are the 14th group, and so on;

[0028] (5) Roof-type wire mesh, assigned positioning markers with identification codes from 32 to 39, divided into 4 groups, 32 and 33 are the 17th group, 34 and 35 are the 18th group, and so on;

[0029] (6) Sisal belts, assigned with identification code numbers 40 to 47, divided into 4 groups, with No. 40 and No. 41 being the 21st group, No. 42 and No. 43 being the 22nd group, and so on;

[0030] (7) The explosion area is assigned with location markers with identification codes from 48 to 55, which are divided into 4 groups. No. 48 and No. 49 are the 25th group, No. 50 and No. 51 are the 26th group, and so on;

[0031] (8) For standby use, positioning markers with identification codes ranging from 56 to 63 are assigned.

[0032] The beneficial effects of the present invention are:

[0033] (1) In this application, the positioning module adopts the UWB positioning form, and the coordinate position of the positioning mark itself is sent to the simulation software in the digital obstacle field through the controller and the communication module for solution and management; in a non-strong light environment, the heating module and the non-heating module on the positioning mark are white and black respectively, which are easy to be identified by visible light at high altitudes. At this time, a visible light camera is used to identify the positioning mark, obtain the position information of the positioning mark, and realize the path detection of the strip-shaped digital obstacle; in a strong light environment, the heating module and the non-heating module on the positioning mark are difficult to be identified by visible light images at high altitudes. Since the surface of the heating module is coated with a low-emissivity coating, it is different from the non-heating module and the heating module in the infrared image. There is a significant difference in the background. At this time, an infrared camera is used to identify the positioning mark, obtain the position information of the positioning mark, and realize the path detection of the strip-shaped digital obstacle; and the present application divides the surface of the substrate into a nine-square grid, and through the two-dimensional code encoding rules, the heating module and the non-heating module in the partial area are combined and encoded to form an identification code, so that the image acquisition unit (infrared and visible light camera) can also collect the identification code of the positioning mark when performing image acquisition; under the action of the positioning module, heating module, non-heating module and identification code, the positioning mark of the present application can accurately locate the target in both strong light and non-strong light modes, which is helpful for subsequent damage assessment, obstacle removal efficiency assessment, etc.

[0034] (2) In the present application, an electric heating wire is provided in the heating module, and the controller can control the temperature of the heating module so that its surface temperature reaches the temperature level at the center of the explosion area, thereby ensuring that the positioning mark can be effectively identified in the infrared image, obtaining the position information and identification code of the positioning mark, and sending the position information and identification code to the infrared detection model to realize the explosion point detection of the ammunition. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the structure of the present invention.

[0036] Figure 2 This is a diagram of the nine-square grid area structure of the substrate.

[0037] Figure 3 It is a schematic diagram of the heating module structure.

[0038] Figure 4 This is the control principle diagram of the present invention.

[0039] Figure 5 Capture images of positioning markers for visible light cameras.

[0040] Figure 6 The infrared camera identifies the image of the positioning mark (the heating module is not heated).

[0041] Figure 7 The infrared camera identifies the image of the positioning mark (heating module heating).

[0042] Figure 8 It is a layout diagram of positioning markers in a digital obstacle field.

[0043] In the figure: 10 is a substrate, 11 is area No. 1, 12 is area No. 2, 13 is area No. 3, 14 is area No. 4, 15 is area No. 5, 16 is area No. 6, 17 is area No. 7, 18 is area No. 8, 19 is area No. 9, 20 is a controller, 30 is a positioning module, 40 is a communication module, 50 is a heating module, 51 is a base, 52 is a heating layer, 53 is a heat-conducting layer, 54 is a heat-insulating layer, 60 is a non-heating module, 70 is a power supply module, and 100 is a positioning mark. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings.

[0045] (refer to Figure 1 and Figure 2 ) An infrared and visible light positioning marker for a digital obstacle field, comprising a hollow substrate 10, and also comprising a power supply module 70, a controller 20, a positioning module 30, a communication module 40, a heating module 50 and a non-heating module 60; the controller 20 is connected to the power supply module 70, the positioning module 30, the communication module 40 and the heating module 50; the power supply module 70 is connected to the positioning module 30, the communication module 40 and the heating module 50; the surface of the heating module 50 is sprayed with a white low-emissivity coating, and the surface of the non-heating module 60 is sprayed with a black coating; the surface of the substrate 10 is divided into nine areas in a nine-square grid , from right to left and from bottom to top are area No. 1 11, area No. 2 12, area No. 3 13, area No. 4 14, area No. 5 15, area No. 6 16, area No. 7 17, area No. 8 18, and area No. 9 19; the controller 20, the positioning module 30, and the communication module 40 are arranged in the central area No. 5 15; the heating module 50 is arranged in area No. 1 11 and area No. 3 13; the heating modules 50 and the non-heating modules 60 are arranged in the remaining 6 areas according to the two-dimensional code encoding rules, thereby forming the identification code of the positioning mark 100; the power supply module 70 is arranged in the inner cavity of the substrate 10.

[0046] Furthermore, the controller 20, the positioning module 30 and the communication module 40 are all existing technologies.

[0047] Furthermore, the heating module 50 includes an electrical connector and a concave base 51 , and a heating layer 52 and a heat-conducting layer 53 are arranged in the inner cavity of the base 51 ; an electric heating wire is arranged in the heating layer 52 , and the electric heating wire is connected to the controller 20 via an electrical connector.

[0048] Furthermore, the heating module 50 and the non-heating module 60 can be connected to the substrate 10 by snapping. The snapping connection method is a prior art and will not be described in detail here.

[0049] For further reference, Figure 4 The controller 20 is used to receive the heating command issued by the simulation software from the communication module 40, control the heating module 50 to heat to a given temperature, upload its own status information and the positioning data of the positioning module 30 to the simulation software; the positioning module 30 is used to measure the position information of the positioning mark 100, using the UWB positioning form to measure the coordinate position of the positioning mark 100 in the digital obstacle field, and the positioning information is sent to the controller 20 and transmitted to the simulation software through the communication module 40; the communication module 40 is used to transmit data between the positioning mark 100 and the simulation software. On the one hand, it receives the heating instruction sent by the simulation software and transmits it to the controller 20, and on the other hand, it receives the positioning information sent by the controller 20 and sends it to the simulation software for solution and management; the power supply module 70 is used to provide working power to the controller 20, the communication module 40 and the positioning module 30, and provide heating power to the heating module 50.

[0050] Furthermore, a heat insulating layer 54 is provided between the heating layer 52 and the inner wall and bottom of the base 51. The heat insulating layer 54 can prevent heat from being conducted to the periphery and bottom of the base 51, ensuring that as much heat as possible is conducted to the heat conducting layer 53 to save electricity.

[0051] A method for using infrared and visible light positioning markers for a digital obstacle field comprises the following steps:

[0052] S1: According to the two-dimensional code encoding rules, the combination of the heating module 50 and the non-heating module 60 in the No. 2 area 12, the No. 4 area 14, the No. 6 area 16, the No. 7 area 17, the No. 8 area 18 and the No. 9 area 19 is encoded. If the heating module 50 is installed, the area represents 1, and if the non-heating module 60 is installed, it represents 0; a byte is used to represent the identification code, wherein the 7th and 8th bits of the byte are fixed to 0, the 6th bit corresponds to the No. 9 area 19, the 5th bit corresponds to the No. 8 area 18, the 4th bit corresponds to the No. 7 area 17, the 3rd bit corresponds to the No. 6 area 16, the 2nd bit corresponds to the No. 4 area 14, and the 1st bit corresponds to the No. 2 area 12, and 64 identification codes can be obtained, which are No. 0 to No. 63 respectively;

[0053] S2: assigning positioning marks 100 to various strip-shaped digital obstacles in the digital obstacle field;

[0054] S3: assigning a positioning mark 100 to the explosion area in the digital obstacle field;

[0055] S4: Arrange positioning marks 100;

[0056] S41: Arrange positioning markers 100 for the strip-shaped digitized obstacles, and place the positioning markers 100 allocated in step S2 at 2 meters at both ends of each corresponding strip-shaped digitized obstacle. When placing, the x-axis and y-axis of the positioning marker 100 and the x-axis and y-axis of the digitized obstacle field have an x-axis angle of no more than 30 degrees;

[0057] S42: Arrange positioning marks 100 for the explosion area, and place the positioning marks 100 allocated in step S3 on the side lines of the digitized obstacle field in the y-axis direction at intervals of 30 meters to 50 meters, and the x-axis and y-axis of the positioning marks 100 and the x-axis and y-axis of the digitized obstacle field have an x-axis angle of no more than 30 degrees;

[0058] S5: Identify the positioning mark 100 according to different scenarios;

[0059] (1) Path detection of strip-shaped digital obstacles

[0060] In a non-strong light environment, the heating module 50 and the non-heating module 60 on the positioning mark 100 are white and black respectively, and the positioning mark 100 is identified by a visible light camera (refer to Figure 5 ), obtaining the position information of the positioning mark 100 and obtaining the identification code information of the positioning mark 100 according to the coding rule in step S1, and directly applying the collected position information and identification code information in the visible light detection model to realize the path detection of the strip-shaped digital obstacle;

[0061] In a strong light environment, an infrared camera is used to identify the heating module 50 on the positioning mark 100 to obtain the position information of the positioning mark 100 (refer to Figure 6 ), and obtain the identification code information of the positioning mark 100 according to the coding rule in S1, and send the position information and the identification code information to the visible light detection model to realize the path detection of the strip-shaped digital obstacle;

[0062] (2) Detection of the explosive point of ammunition

[0063] The controller 20 is used to control the temperature of the heating module 50 so that its surface temperature reaches the temperature level of the center of the explosion area, ensuring that the positioning mark 100 can be effectively identified in the infrared image (refer to Figure 7 ), obtain the position information of the positioning mark 100, and obtain the identification code information of the positioning mark 100 according to the coding rule in S1, and send the position information and the identification code information to the infrared detection model to realize the explosion point detection of the ammunition.

[0064] Furthermore, the specific allocation of the positioning mark 100 in steps S2 and S3 is:

[0065] (1) For the barrier wall, the positioning marks 100 with identification codes 0 to 7 are allocated and divided into 4 groups, with 0 and 1 being the first group, 2 and 3 being the second group, and so on;

[0066] (2) Blocking trenches: Positioning markers 100 with identification codes ranging from 8 to 15 are allocated and divided into four groups. Numbers 8 and 9 are the fifth group, numbers 10 and 11 are the sixth group, and so on.

[0067] (3) For accordion-type wire mesh, the positioning markers 100 with identification codes ranging from 16 to 23 are assigned and divided into 4 groups, with 16 and 17 being the 9th group, 18 and 19 being the 10th group, and the others being the same;

[0068] (4) For the straight-pile wire fence, the positioning marks 100 with identification codes ranging from 24 to 31 are allocated and divided into 4 groups. No. 24 and No. 25 are the 13th group, No. 26 and No. 27 are the 14th group, and so on;

[0069] (5) Roof-type wire mesh, assigned with identification code numbers 32 to 39, positioning markers 100, divided into 4 groups, 32 and 33 are the 17th group, 34 and 35 are the 18th group, and so on;

[0070] (6) Sisal belts, assigned with positioning marks 100 with identification code numbers 40 to 47, divided into 4 groups, with No. 40 and No. 41 being the 21st group, No. 42 and No. 43 being the 22nd group, and so on;

[0071] (7) In the explosion area, the location markers 100 with identification code numbers 48 to 55 are allocated and divided into 4 groups, with 48 and 49 being the 25th group, 50 and 51 being the 26th group, and the others being the same by analogy;

[0072] (8) For standby use, positioning markers 100 with identification code numbers 56 to 63 are allocated.

[0073] Furthermore, the present application uses a QR code encoding rule, and of course other encoding methods may also be used. The encoding methods are diverse and not limited to QR codes, and the main thing is that the positioning mark 100 can be distinguished.

[0074] The described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A digital obstacle field infrared and visible light positioning marker, comprising a hollow substrate, characterized in that: It also includes a power supply module, a controller, a positioning module, a communication module, a heating module and a non-heating module; The controller is connected to the power supply module, the positioning module, the communication module and the heating module; The power supply module is connected to the positioning module, the communication module and the heating module; the surface of the heating module is sprayed with a white low-emissivity coating, and the surface of the non-heating module is sprayed with a black coating; The substrate surface is divided into nine areas in a nine-square grid, which are area 1, area 2, ..., and area 9 from right to left and from bottom to top; the controller, positioning module and communication module are arranged in area 5 in the center; the heating module is arranged in area 1 and area 3; the heating module and the non-heating module are arranged in the remaining 6 areas according to the QR code encoding rules, thereby forming an identification code of the positioning mark; The power supply module is arranged in the inner cavity of the substrate.

2. The infrared and visible light positioning marker for a digital obstacle field according to claim 1, characterized in that: The heating module comprises an electrical connector and a concave base, wherein a heating layer and a heat-conducting layer are arranged in the inner cavity of the base; an electric heating wire is arranged in the heating layer, and the electric heating wire is connected to a controller via an electrical connector.

3. The infrared and visible light positioning marker for a digital obstacle field according to claim 2, characterized in that: A heat insulating layer is also arranged between the heating layer and the inner wall and bottom of the base.

4. A method for using the infrared and visible light positioning marker for a digital obstacle field according to any one of claims 1 to 3, characterized in that: The following steps are included: S1: According to the two-dimensional code encoding rules, the combination of heating modules and non-heating modules in the No. 2 area, No. 4 area, No. 6 area, No. 7 area, No. 8 area and No. 9 area is encoded, and the area represents 1 if the heating module is installed, and 0 if the non-heating module is installed; a byte is used to represent the identification code, wherein the 7th and 8th bits of the byte are fixed to 0, the 6th bit corresponds to the No. 9 area, the 5th bit corresponds to the No. 8 area, the 4th bit corresponds to the No. 7 area, the 3rd bit corresponds to the No. 6 area, the 2nd bit corresponds to the No. 4 area, and the 1st bit corresponds to the No. 2 area, and 64 identification codes are obtained, which are No. 0 to No. 63 respectively; S2: assign positioning marks to various strip-shaped digital obstacles in the digital obstacle field; S3: assigning location marks to the explosion areas in the digital obstacle field; S4: Arrange positioning marks; S41: Arrange positioning marks for the strip-shaped digitized obstacles, and place the positioning marks allocated in step S2 at 2 meters on both ends of each corresponding strip-shaped digitized obstacle. When placing, the x-axis and y-axis of the positioning marks and the x-axis and y-axis of the digitized obstacle field have an x-axis angle of no more than 30 degrees; S42: Arrange positioning marks for the explosion area, and place the positioning marks allocated in step S3 on both sides of the edge lines of the digitized obstacle field in the y-axis direction at intervals of 30 meters to 50 meters, and the x-axis and y-axis of the positioning marks and the x-axis and y-axis of the digitized obstacle field have an x-axis angle of no more than 30 degrees; S5: Carry out identification of positioning markers according to different scenarios; (1) Path detection of strip-shaped digital obstacles In a non-strong light environment, the heating module and the non-heating module on the positioning mark are white and black respectively, and the positioning mark is identified by a visible light camera, the position information of the positioning mark is obtained, and the identification code information of the positioning mark is obtained according to the coding rule in step S1, and the collected position information and identification code information are directly applied in the visible light detection model to realize the path detection of the strip-shaped digital obstacle; In a strong light environment, an infrared camera is used to identify the heating module on the positioning mark to obtain the position information of the positioning mark, and the identification code information of the positioning mark is obtained according to the coding rule in S1, and the position information and identification code information are sent to the visible light detection model to realize the path detection of the strip-shaped digital obstacle; (2) Detection of the explosive point of ammunition The controller is used to control the temperature of the heating module so that its surface temperature reaches the temperature level of the center of the explosion area, ensuring that the positioning mark can be effectively identified in the infrared image, obtaining the position information of the positioning mark, and obtaining the identification code information of the positioning mark according to the coding rule in S1, and sending the position information and identification code information to the infrared detection model to realize the explosion point detection of the ammunition.

5. The method for using infrared and visible light positioning markers for digital obstacle fields according to claim 4 is characterized in that: The specific allocation of the positioning identifiers in steps S2 and S3 is as follows: (1) For barrier walls, positioning markers with identification codes ranging from 0 to 7 are assigned and divided into 4 groups. 0 and 1 are group 1, 2 and 3 are group 2, and so on; (2) Blocking trenches, with positioning markers numbered 8 to 15, divided into four groups. Numbers 8 and 9 are the fifth group, numbers 10 and 11 are the sixth group, and so on; (3) For accordion-type wire mesh, the positioning markers with identification codes ranging from 16 to 23 are assigned and divided into 4 groups. No. 16 and No. 17 are the 9th group, No. 18 and No. 19 are the 10th group, and so on; (4) For the straight-pile wire fence, the positioning markers with identification codes ranging from 24 to 31 are assigned and divided into 4 groups. No. 24 and No. 25 are the 13th group, No. 26 and No. 27 are the 14th group, and so on; (5) Roof-type wire mesh, assigned positioning markers with identification codes from 32 to 39, divided into 4 groups, 32 and 33 are the 17th group, 34 and 35 are the 18th group, and so on; (6) Sisal belts, assigned with identification code numbers 40 to 47, divided into 4 groups, with No. 40 and No. 41 being the 21st group, No. 42 and No. 43 being the 22nd group, and so on; (7) The explosion area is assigned with location markers with identification codes from 48 to 55, which are divided into 4 groups. No. 48 and No. 49 are the 25th group, No. 50 and No. 51 are the 26th group, and so on; (8) For standby use, positioning markers with identification codes ranging from 56 to 63 are assigned.

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