Intelligent supervision system based on dynamic data of drainage pipe network

Abstract

The invention relates to the technical field of drainage supervision, in particular to an intelligent supervision system based on dynamic data of a drainage pipe network. The system comprises a drainage pipe network data acquisition module, a city partition module and an intelligent allocation module. The drainage pipe network data acquisition module is used for acquiring the distribution condition of all drainage pipes in the whole control area so as to obtain drainage pipe network data; the city partition module is used for acquiring geographic data of a control area, dividing the control area into a plurality of drainage areas, and dividing the distribution data of the drainage pipes into a plurality of drainage pipe unit distribution data corresponding to the drainage areas according to the drainage areas; and the intelligent allocation module is configured to obtain the weather data of the whole control area, analyze the weather data to obtain the precipitation amount of the unit time corresponding to the plurality of drainage areas, and combine and adjust the drainage pipe units according to the precipitation amount and the distribution data of the drainage pipe units.

Description

Technical Field

[0001] The present invention relates to the technical field of drainage monitoring, and in particular to an intelligent monitoring system based on dynamic data of a drainage network. Background Art

[0002] The urban drainage system is an engineering facility system for treating and removing urban sewage and rainwater, and is a component of urban public facilities. The urban drainage system planning is a component of the city's overall planning. The urban drainage system is usually composed of drainage pipes and sewage treatment plants. In the case of sewage and rainwater diversion, sewage is collected by drainage pipes, sent to sewage treatment, and then discharged into water bodies or recycled; rainwater runoff is collected by drainage pipes and discharged into nearby water bodies.

[0003] The existing urban drainage system has not been coordinated and allocated. In the event of heavy rain, some areas will experience waterlogging. In order to solve this technical problem, an intelligent supervision system based on dynamic data of the drainage network is proposed. Summary of the invention

[0004] In order to solve the technical problems existing in the above-mentioned prior art, the present invention provides an intelligent monitoring system based on dynamic data of drainage network.

[0005] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0006] In a first aspect, in an embodiment provided by the present invention, a smart monitoring system based on dynamic data of a drainage network is provided, the system comprising: a drainage network data acquisition module, a city zoning module and an intelligent deployment module;

[0007] The drainage network data acquisition module is used to acquire the distribution of all drainage pipes in the entire control area to obtain drainage network data;

[0008] The city zoning module is used to obtain geographic data of the control area, and divide the control area into a number of drainage areas, and divide the distribution data of the drainage pipes into a number of drainage pipe unit distribution data corresponding to the drainage areas according to the drainage areas;

[0009] The intelligent allocation module is configured to obtain weather data of the entire control area, analyze it to obtain precipitation per unit time corresponding to several drainage areas, and combine and adjust the drainage pipe units according to the precipitation and drainage pipe unit distribution data.

[0010] As a further solution of the present invention, the city zoning module includes a region division unit and a drainage network zoning unit;

[0011] The area division unit is configured to obtain geographic data of the control area and divide the control area into a number of unit drainage areas according to administrative divisions;

[0012] The drainage network partitioning unit is configured to divide the entire drainage network into a number of drainage unit networks based on a number of unit drainage areas and drainage network data, and the several drainage unit networks are arranged in a one-to-one correspondence with the several unit drainage areas.

[0013] As a further solution of the present invention, the intelligent allocation module includes a rainfall analysis unit and an intelligent allocation unit;

[0014] The rainfall analysis unit is configured to obtain weather data of the entire control area and analyze the weather data to obtain the rainfall per unit time corresponding to each of the plurality of drainage areas;

[0015] The intelligent allocation unit is configured to determine whether the precipitation per unit time corresponding to each of the several drainage areas exceeds the drainage volume of the corresponding drainage pipe unit. If so, a drainage demand signal is generated, and unified allocation is performed between the drainage units according to the drainage demand signal.

[0016] As a further solution of the present invention, the intelligent allocation unit includes a judgment subunit and an intelligent allocation subunit;

[0017] The judgment subunit is configured to judge whether the precipitation per unit time corresponding to each of the plurality of drainage areas exceeds the drainage volume of the corresponding drainage pipe unit, and if so, generates a drainage volume demand signal;

[0018] The intelligent allocation subunit is configured to obtain drainage surplus data of each drainage area adjacent to the drainage area that needs drainage assistance based on the drainage demand signal, and to coordinately adjust adjacent drainage pipe units based on the drainage surplus data.

[0019] As a further solution of the present invention, a drainage pipe flow monitoring module is further included, wherein the drainage pipe flow monitoring module is used to record the flow of each drainage pipe and determine whether it is blocked according to the precipitation in the corresponding area, and if blocked, a secondary drainage demand signal is issued;

[0020] The intelligent allocation module is also configured to obtain drainage surplus data of each drainage area adjacent to the drainage area that needs drainage assistance based on the secondary drainage demand signal, and to coordinately adjust adjacent drainage pipe units based on the drainage surplus data.

[0021] As a further solution of the present invention, the drainage pipe flow monitoring module includes a recording unit and a processing unit;

[0022] The recording unit is configured to record the flow rate of each drainage pipe;

[0023] The processing unit is configured to determine whether blockage occurs in the corresponding area according to the precipitation in the corresponding area, and to send a secondary drainage demand signal if blockage occurs.

[0024] As a further solution of the present invention, an operation and maintenance module is also included, which is configured to operate and maintain the pipeline network.

[0025] As a further solution of the present invention, the operation and maintenance module includes an operation and maintenance reporting unit and an operation and maintenance recording unit;

[0026] The operation and maintenance reporting unit is used to upload operation and maintenance photos at different operation and maintenance points;

[0027] The operation and maintenance recording unit is used to record operation and maintenance photos according to area, operation and maintenance category and time.

[0028] As a further solution of the present invention, the operation and maintenance reporting unit includes an area selection subunit, an operation and maintenance category selection subunit, a point selection subunit and a photo uploading unit;

[0029] The area selection subunit is used to select an operation and maintenance area;

[0030] The operation and maintenance category selection subunit is used to select an operation and maintenance category;

[0031] The point selection subunit is used to select the operation and maintenance location;

[0032] The photo uploading subunit is used to upload operation and maintenance photos.

[0033] As a further solution of the present invention, the operation and maintenance recording unit is used to automatically generate an operation and maintenance report according to the operation and maintenance area, operation and maintenance category, operation and maintenance location and operation and maintenance photos uploaded by the operation and maintenance reporting unit, and digitally sign the operation and maintenance report.

[0034] The technical solution provided by the present invention has the following beneficial effects:

[0035] The intelligent monitoring system based on dynamic data of drainage pipe network provided by the present invention obtains the distribution of all drainage pipes in the entire control area through the drainage pipe network data acquisition module to obtain drainage pipe network data; the urban zoning module obtains the geographical data of the control area, and divides the control area into a number of drainage areas, and divides the distribution data of the drainage pipes into a number of drainage pipe unit distribution data corresponding to the drainage areas according to the several drainage areas; the intelligent allocation module obtains the weather data of the entire control area, and analyzes it to obtain the precipitation per unit time corresponding to the several drainage areas, and combines and adjusts the drainage pipe units according to the precipitation and the drainage pipe unit distribution data; in this way, the entire drainage pipe network can be comprehensively adjusted according to the rainfall in each area, so that rainwater can be quickly discharged, urban waterlogging can be avoided, and drainage efficiency can be improved.

[0036] These and other aspects of the present invention will be more clearly understood in the following description of the embodiments. It should be understood that the above general description and the following detailed description are only exemplary and explanatory and cannot limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying creative work.

[0038] Figure 1 The structure framework of the intelligent monitoring system based on dynamic data of drainage network according to an embodiment of the present invention is as follows: Figure 1 .

[0039] Figure 2 This is a structural block diagram of a city zoning module in a smart monitoring system based on dynamic data of a drainage network according to an embodiment of the present invention.

[0040] Figure 3 This is a structural block diagram of an intelligent deployment module in a smart monitoring system based on dynamic data of a drainage network according to an embodiment of the present invention.

[0041] Figure 4 This is a structural block diagram of an intelligent distribution unit in a smart monitoring system based on dynamic data of a drainage network according to an embodiment of the present invention.

[0042] Figure 5 The structure framework of the intelligent monitoring system based on dynamic data of drainage network according to an embodiment of the present invention is as follows: Figure 2 .

[0043] Figure 6This is a structural block diagram of a drainage pipe flow monitoring module in a smart monitoring system based on dynamic data of a drainage pipe network according to an embodiment of the present invention.

[0044] Figure 7 This is a structural block diagram of the operation and maintenance module in an intelligent monitoring system based on dynamic data of a drainage network according to an embodiment of the present invention.

[0045] Figure 8 This is a structural block diagram of an operation and maintenance reporting unit in a smart monitoring system based on dynamic data of a drainage network according to an embodiment of the present invention.

[0046] In the figure: 100-drainage network data acquisition module, 200-city zoning module, 300-intelligent allocation module, 400-drainage pipe flow monitoring module, 500-operation and maintenance module, 201-region division unit, 202-drainage network zoning unit, 301-rainfall analysis unit, 302-intelligent allocation unit, 3021-judgment subunit, 3022-intelligent allocation subunit, 401-recording unit, 402-processing unit, 501-operation and maintenance reporting unit, 502-operation and maintenance recording unit, 5011-region selection subunit, 5012-operation and maintenance category selection subunit, 5013-point selection subunit, 5014-photo upload subunit. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the 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.

[0048] The flowcharts shown in the accompanying drawings are only examples and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may be decomposed, combined or partially merged, so the actual execution order may change according to actual conditions.

[0049] It should be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0050] Specifically, the embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0051] In one embodiment, see Figure 1As shown, in an embodiment of the present invention, a smart monitoring system based on dynamic data of a drainage network is also provided, and the system includes a drainage network data acquisition module 100, a city zoning module 200, and an intelligent allocation module 300. The system of the present invention is applied to an urban drainage system, and a switch valve is provided on each key pipeline of the urban drainage system, and the drainage volume of the corresponding area can be adjusted by controlling the opening size of the switch valve.

[0052] The drainage network data acquisition module 100 is used to acquire the distribution of all drainage pipes in the entire control area to obtain drainage network data.

[0053] The drainage pipe network data includes data such as the layout of water pipes, the diameter of each water pipe, the maximum flow rate, and the valve position.

[0054] The city zoning module 200 is used to obtain the geographical data of the control area and divide the control area into a number of drainage areas. According to the number of drainage areas, the distribution data of the drainage pipes are divided into a number of drainage pipe unit distribution data corresponding to the drainage areas; in this way, each drainage area and the drainage pipe unit distribution data of each area are connected, so that the drainage pipes between adjacent units can be allocated according to the precipitation.

[0055] See also Figure 2 As shown, in the embodiment of the present invention, the city zoning module 200 includes a region division unit 201 and a drainage network zoning unit 202 .

[0056] The area division unit 201 is configured to obtain geographic data of the control area and divide the control area into several unit drainage areas according to administrative divisions; this makes it easy to divide the drainage network according to administrative names, which is convenient for later management.

[0057] The drainage network partitioning unit 202 is configured to divide the entire drainage network into a number of drainage unit networks based on a number of unit drainage areas and drainage network data, and the number of drainage unit networks is set in a one-to-one correspondence with the number of unit drainage areas.

[0058] The intelligent allocation module 300 is configured to obtain weather data of the entire control area, analyze it to obtain the precipitation per unit time corresponding to several drainage areas, and combine and adjust the drainage pipe units according to the precipitation and drainage pipe unit distribution data to meet the drainage demand and avoid serious waterlogging in a certain area, resulting in property loss.

[0059] See also Figure 3 As shown, in the embodiment of the present invention, the intelligent allocation module 300 includes a rainfall analysis unit 301 and an intelligent allocation unit 302 .

[0060] The rainfall analysis unit 301 is configured to obtain weather data of the entire control area and analyze the weather data to obtain the rainfall per unit time corresponding to each of the plurality of drainage areas.

[0061] The intelligent allocation unit 302 is configured to determine whether the precipitation per unit time corresponding to each of the several drainage areas exceeds the drainage volume of the corresponding drainage pipe unit. If so, a drainage demand signal is generated, and the drainage units are uniformly allocated according to the drainage demand signal, so that the drainage in each area can be discharged in a timely and rapid manner.

[0062] See also Figure 4 As shown, in the embodiment of the present invention, the intelligent allocation unit 302 includes a judgment subunit 3021 and an intelligent allocation subunit 3022.

[0063] The judgment subunit 3021 is configured to judge whether the precipitation per unit time corresponding to each of the plurality of drainage areas exceeds the drainage volume of the corresponding drainage pipe unit, and if so, generates a drainage volume demand signal;

[0064] The intelligent allocation subunit 3022 is configured to obtain drainage surplus data of each drainage area adjacent to the drainage area that needs drainage assistance based on the drainage demand signal, and to coordinate and adjust adjacent drainage pipe units based on the drainage surplus data to ensure smooth drainage of water.

[0065] The present invention obtains the distribution of all drainage pipes in the entire control area through the drainage network data acquisition module 100 to obtain the drainage network data. The urban zoning module 200 obtains the geographical data of the control area and divides the control area into a number of drainage areas. The distribution data of the drainage pipes is divided into a number of drainage pipe unit distribution data corresponding to the drainage areas according to the several drainage areas; the intelligent allocation module 300 obtains the weather data of the entire control area, and analyzes it to obtain the precipitation per unit time corresponding to the several drainage areas, and combines and adjusts the drainage pipe units according to the precipitation and the drainage pipe unit distribution data; in this way, the entire drainage network can be comprehensively adjusted according to the rainfall in each area, so that rainwater can be quickly discharged, urban waterlogging can be avoided, and drainage efficiency can be improved.

[0066] See also Figure 5 As shown, the present invention further includes a drainage pipe flow monitoring module 400, which is used to record the flow of each drainage pipe and determine whether it is blocked according to the precipitation in the corresponding area, and send a secondary drainage demand signal if it is blocked;

[0067] The intelligent allocation module 300 is also configured to obtain drainage surplus data of each drainage area adjacent to the drainage area that needs drainage assistance based on the secondary drainage demand signal, and to coordinate and adjust adjacent drainage pipe units based on the drainage surplus data to ensure smooth drainage of water.

[0068] In this way, the water flow can be monitored in real time to avoid the phenomenon of being unable to drain water in time due to blockage.

[0069] See also Figure 6 As shown, in the embodiment of the present invention, the drainage pipe flow monitoring module 400 includes a recording unit 401 and a processing unit 402 .

[0070] The recording unit 401 is configured to record the flow of each drainage pipe;

[0071] The processing unit 402 is configured to determine whether a blockage occurs in the corresponding area according to the precipitation in the corresponding area, and to send a secondary drainage demand signal if a blockage occurs.

[0072] Specifically, the processing unit 402 reads the recorded drainage data in real time, and retrieves the real-time precipitation data of the corresponding area for comparison and judgment. If the drainage recorded in the drainage data is continuously lower than the expected drainage data, it is determined that the corresponding drainage pipe is blocked, and a blockage signal is issued in time, so that the blockage can be processed in time so that the blocked water can be discharged in time.

[0073] The present invention can detect blockage in time by setting up the drainage pipe flow monitoring module 400, and can adjust the valve switch of the drainage pipe network in time, so that the water in the blocked area can be discharged through the surrounding area in time, thereby improving drainage efficiency and safety.

[0074] See also Figure 5 As shown, in order to improve the safety of the pipe network operation, the present invention further includes an operation and maintenance module 500, and the operation and maintenance module 500 is configured to operate and maintain the pipe network.

[0075] See also Figure 7 As shown, in the embodiment of the present invention, the operation and maintenance module 500 includes an operation and maintenance reporting unit 501 and an operation and maintenance recording unit 502;

[0076] The operation and maintenance reporting unit 501 is used to upload operation and maintenance photos at different operation and maintenance points.

[0077] See also Figure 8 As shown, in the embodiment of the present invention, the operation and maintenance reporting unit 501 includes an area selection subunit 5011, an operation and maintenance category selection subunit 5012, a point selection subunit 5013 and a photo uploading unit 5014;

[0078] The area selection subunit 5011 is used to select an operation and maintenance area;

[0079] The operation and maintenance category selection subunit 5012 is used to select an operation and maintenance category;

[0080] The point selection subunit 5013 is used to select the operation and maintenance location;

[0081] The photo uploading subunit 5014 is used to upload operation and maintenance photos.

[0082] The operation and maintenance recording unit 502 is used to record operation and maintenance photos according to area, operation and maintenance category and time.

[0083] Specifically, the operation and maintenance recording unit 502 is used to automatically generate an operation and maintenance report according to the operation and maintenance area, operation and maintenance category, operation and maintenance location and operation and maintenance photos uploaded by the operation and maintenance reporting unit 501, and digitally sign the operation and maintenance report to avoid subsequent tampering and improve the authenticity of the operation and maintenance.

[0084] The digital signature process includes:

[0085] The generated initial operation and maintenance report is processed using a hash algorithm to generate a document summary;

[0086] The document summary is encrypted using the private key to obtain a digital signature, ensuring that only the signer can generate the correct digital signature because the private key is only held by the signer.

[0087] It should be noted that a digital signature (also known as a public key digital signature) is a string of numbers that can only be generated by the sender of the information and cannot be forged by others. This string of numbers is also an effective proof of the authenticity of the information sent by the sender. It is a method for authenticating digital information, similar to an ordinary physical signature written on paper, but implemented using technology in the field of public key encryption. A set of digital signatures usually defines two complementary operations, one for signing and the other for verification. Digital signatures are the application of asymmetric key encryption technology and digital summary technology.

[0088] It should be noted that the hash algorithm transforms an input of arbitrary length (also called pre-image) into an output of fixed length through a hash algorithm, and the output is the hash value. This conversion is a compression mapping, that is, the space of hash values ​​is usually much smaller than the space of inputs, and different inputs may hash to the same output, so it is impossible to determine the unique input value from the hash value. Simply put, it is a function that compresses a message of arbitrary length into a message digest of a fixed length.

[0089] The present invention can electronically record the operation and maintenance of the pipe network by setting up the operation and maintenance module 500, and can facilitate the query of pipe network faults at a later time, thereby improving safety and being more convenient to use.

[0090] It should be understood that, as used herein, the singular form "a" or "an" is intended to include the plural form as well, unless the context clearly supports an exception. It should also be understood that, as used herein, "and / or" refers to any and all possible combinations of one or more of the items listed in association. The serial numbers of the embodiments disclosed in the above embodiments of the present invention are for description only and do not represent the advantages and disadvantages of the embodiments.

[0091] A person skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the disclosure of the embodiments of the present invention (including the claims) is limited to these examples; under the concept of the embodiments of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the embodiments of the present invention as above, which are not provided in detail for the sake of simplicity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims

1. An intelligent monitoring system based on dynamic data of drainage network, characterized in that: The system includes: drainage network data acquisition module, city zoning module and intelligent deployment module; The drainage network data acquisition module is used to acquire the distribution of all drainage pipes in the entire control area to obtain drainage network data; The city zoning module is used to obtain geographic data of the control area, and divide the control area into a number of drainage areas, and divide the distribution data of the drainage pipes into a number of drainage pipe unit distribution data corresponding to the drainage areas according to the drainage areas; The intelligent allocation module is configured to obtain weather data of the entire control area, analyze it to obtain precipitation per unit time corresponding to several drainage areas, and combine and adjust the drainage pipe units according to the precipitation and drainage pipe unit distribution data.

2. The intelligent monitoring system based on dynamic data of drainage network according to claim 1, characterized in that: The city zoning module includes a regional division unit and a drainage network division unit; The area division unit is configured to obtain geographic data of the control area and divide the control area into a number of unit drainage areas according to administrative divisions; The drainage network partitioning unit is configured to divide the entire drainage network into a number of drainage unit networks based on a number of unit drainage areas and drainage network data, and the several drainage unit networks are arranged in a one-to-one correspondence with the several unit drainage areas.

3. The intelligent monitoring system based on dynamic data of drainage network as claimed in claim 2, characterized in that: The intelligent allocation module includes a rainfall analysis unit and an intelligent allocation unit; The rainfall analysis unit is configured to obtain weather data of the entire control area and analyze the weather data to obtain the rainfall per unit time corresponding to each of the plurality of drainage areas; The intelligent allocation unit is configured to determine whether the precipitation per unit time corresponding to each of the several drainage areas exceeds the drainage volume of the corresponding drainage pipe unit. If so, a drainage demand signal is generated, and unified allocation is performed between the drainage units according to the drainage demand signal.

4. The intelligent monitoring system based on dynamic data of drainage network according to claim 1, characterized in that: The intelligent allocation unit includes a judgment subunit and an intelligent allocation subunit; The judgment subunit is configured to judge whether the precipitation per unit time corresponding to each of the plurality of drainage areas exceeds the drainage volume of the corresponding drainage pipe unit, and if so, generates a drainage volume demand signal; The intelligent allocation subunit is configured to obtain drainage surplus data of each drainage area adjacent to the drainage area that needs drainage assistance based on the drainage demand signal, and to coordinately adjust adjacent drainage pipe units based on the drainage surplus data.

5. The intelligent monitoring system based on dynamic data of drainage network as claimed in claim 3, characterized in that: It also includes a drainage pipe flow monitoring module, which is used to record the flow of each drainage pipe and determine whether it is blocked according to the precipitation in the corresponding area. If blockage occurs, a secondary drainage demand signal is issued; The intelligent allocation module is also configured to obtain drainage surplus data of each drainage area adjacent to the drainage area that needs drainage assistance based on the secondary drainage demand signal, and to coordinately adjust adjacent drainage pipe units based on the drainage surplus data.

6. The intelligent monitoring system based on dynamic data of drainage network as claimed in claim 5, characterized in that: The drainage pipe flow monitoring module includes a recording unit and a processing unit; The recording unit is configured to record the flow rate of each drainage pipe; The processing unit is configured to determine whether blockage occurs in the corresponding area according to the precipitation in the corresponding area, and to send a secondary drainage demand signal if blockage occurs.

7. The intelligent monitoring system based on dynamic data of drainage network as claimed in claim 5, characterized in that: It also includes an operation and maintenance module, which is configured to operate and maintain the pipeline network.

8. The intelligent monitoring system based on dynamic data of drainage pipe network according to claim 7, characterized in that: The operation and maintenance module includes an operation and maintenance reporting unit and an operation and maintenance recording unit; The operation and maintenance reporting unit is used to upload operation and maintenance photos at different operation and maintenance points; The operation and maintenance recording unit is used to record operation and maintenance photos according to area, operation and maintenance category and time.

9. The intelligent monitoring system based on dynamic data of drainage pipe network according to claim 8, characterized in that: The operation and maintenance reporting unit includes an area selection subunit, an operation and maintenance category selection subunit, a point selection subunit and a photo uploading unit; The area selection subunit is used to select an operation and maintenance area; The operation and maintenance category selection subunit is used to select an operation and maintenance category; The point selection subunit is used to select the operation and maintenance location; The photo uploading subunit is used to upload operation and maintenance photos.

10. The intelligent monitoring system based on dynamic data of drainage pipe network according to claim 9, characterized in that: The operation and maintenance recording unit is used to automatically generate an operation and maintenance report according to the operation and maintenance area, operation and maintenance category, operation and maintenance location and operation and maintenance photos uploaded by the operation and maintenance reporting unit, and to digitally sign the operation and maintenance report.

Images