CN114244867A - Ship dynamic distribution monitoring system based on offshore AIS data - Google Patents

Ship dynamic distribution monitoring system based on offshore AIS data Download PDF

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CN114244867A
CN114244867A CN202111540062.8A CN202111540062A CN114244867A CN 114244867 A CN114244867 A CN 114244867A CN 202111540062 A CN202111540062 A CN 202111540062A CN 114244867 A CN114244867 A CN 114244867A
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CN114244867B (en
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胡青
宋蒙恩
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Dalian Maritime University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G3/00—Traffic control systems for marine craft
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H04W4/42—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for mass transport vehicles, e.g. buses, trains or aircraft
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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Abstract

The invention provides a ship dynamic distribution monitoring system based on offshore AIS data, which mainly comprises: receiving AIS data sent by a ship and preprocessing the AIS data so as to provide a data server side of the marine data which can be directly used for calculation; the data server provides marine data to the data server, and the data server provides a ship coverage density calculation service, a ship communication distance reachable service and a ship communication network coverage service, and a service center is used for calling the ship coverage density calculation service, the ship communication distance reachable service and the ship communication network coverage service of the data server and storing the calculation service result.

Description

Ship dynamic distribution monitoring system based on offshore AIS data
Technical Field
The invention relates to the technical field of ship information processing, in particular to a ship dynamic distribution monitoring system based on offshore AIS data.
Background
In the existing marine ship communication research, a lot of researches on line planning, abnormal monitoring and distribution density are carried out on AIS data, but the research on ship communication coverage, particularly dynamic ship coverage distribution is insufficient. The ship sails on the sea, and the communication is an important support for ensuring high efficiency and safety of the ship sailing. However, in the case of maritime communication, due to the special environment, a base station cannot be built to relay and forward information, and only a ship can be used as a relay node to forward information. Therefore, the topological distribution of marine vessels becomes the basis of communication, and it is important to grasp the dynamic coverage state of marine vessels.
The existing research aiming at AIS data mainly comprises ship abnormal distribution research, course extraction and prediction, ship collision avoidance and abnormal detection and the like. The abnormal distribution research of the ship reveals the abnormal behavior of the ship navigation, so as to judge false information or fake plate ships. The ship navigation law is researched aiming at the ship route, and the route of the next stage is predicted, so that the navigation efficiency is improved, the fuel is saved, and the like. By means of the AIS message, the current sea area ship traffic condition is researched, the monitoring of sea traffic abnormity is carried out, the ship is commanded to carry out collision avoidance operation, and the ship navigation safety is improved. The research only aims at analyzing and researching AIS data of partial sea areas or partial ships, cannot provide a reliable network topology structure for the whole sea area, and cannot increase the communication probability and efficiency of the ships.
Disclosure of Invention
According to the technical problem that communication coverage research on ships in sea areas is lacked, the ship dynamic distribution monitoring system based on the offshore AIS data is provided. The invention provides a calculation method for AIS data on dynamic topological distribution and communication coverage of a marine ship, describes the ship one-way communication distance and the sea communication coverage in detail, and provides theoretical basis and reference for ship networking communication and message transmission.
The technical means adopted by the invention are as follows:
a ship dynamic distribution monitoring system based on offshore AIS data, the system mainly comprises:
receiving AIS data sent by a ship and preprocessing the AIS data so as to provide a data server side of the marine data which can be directly used for calculation;
an operation server for providing a ship coverage density calculation service, a ship communication distance reachable service and a ship communication network coverage service based on the marine data provided by the data server, and
and the service center is used for calling the ship coverage density calculation service, the ship communication distance reachable service and the ship communication network coverage service of the operation service end and storing the operation service result.
Further, the operation server provides a ship coverage density calculation service, including:
s101, acquiring ship position information and a ship communication distance by the data server;
s102, calculating a ship communication coverage area by taking a certain ship as a center and the communication distance of the ship as a radius;
s103, calculating the ship coverage density according to the number of ships in the ship communication coverage range.
Further, the operation server provides a ship communication distance reachable service, and includes:
s201, acquiring a ship single-hop communication distance by the data server;
s202, selecting a communication direction by an initial communication ship and planning a communication area, wherein the communication area is an area which is planned by taking the initial ship as a center and taking a ship single-hop communication distance as a radius in a parallel communication direction, and all ships in the communication area are to-be-candidate ships;
s203, calculating the distance between the initial ship and the ship to be candidate, if the distance is smaller than the single-hop communication distance of the ship, adding the corresponding ship to be candidate to a candidate table, and executing S204; if the distance is larger than the ship single-hop communication distance, setting the initial ship as a terminal ship, and executing S205;
s204, selecting the ship node with the largest distance as a destination ship based on the candidate table, setting the destination ship as a new initial ship, deleting ship information in the candidate table in the candidate ship to be candidate at the moment, and executing S203;
s205, calculating the distance between the initial communication ship and the final ship, and taking the sum of the distance between the initial communication ship and the final ship and the single-hop communication distance of the ship as the final communication reachable distance.
Further, the operation server provides a ship communication network coverage service, including:
s301, determining a monitoring range, and acquiring ship position information and a ship single-hop communication distance in the detection range by the data server;
s302, calculating a communication coverage range of each ship node based on ship position information and a ship single-hop communication distance, wherein the communication coverage range is a circular area taking a ship position as a center and the ship single-hop communication distance as a radius;
and S303, communicating the communication coverage areas of all the ships in the monitoring range to form a communication network, and counting the communication network coverage area to obtain the maximum communication network range of the ships in the monitoring range.
Compared with the prior art, the invention has the following advantages:
the invention provides a ship dynamic distribution coverage calculation method based on the offshore AIS data based on AIS data and combined with the offshore special communication environment and ship communication topology requirements, the method can effectively calculate the ship one-way farthest communication distance and the ship dynamic distribution and communication coverage condition of data related to the ship in the sea area, provides reliable reference basis for ship networking communication and data transmission, increases the communication probability of the offshore ship and improves the communication quality.
Based on the reasons, the invention can be widely popularized in the fields of marine ship communication and the like.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a diagram of the marine AIS data-based ship dynamic distribution monitoring system architecture according to the present invention.
Fig. 2 is a flowchart of calculating the farthest communication distance according to the present invention.
Fig. 3 is a schematic view of the communication coverage overlap between two ships according to the present invention.
Fig. 4 is a schematic diagram of actual coverage of ship communication in a research area according to the invention.
Fig. 5 is a communication coverage area calculation process according to the present invention.
FIG. 6 is a density chart of a ship in the example.
Fig. 7 is a communication distance diagram in the embodiment.
Fig. 8 is an embodiment of a communication coverage map.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
As shown in fig. 1, the invention provides a ship dynamic distribution monitoring system based on offshore AIS data, which mainly comprises a data server, an operation server and a service center.
Specifically, the data server is used for receiving AIS data sent by a ship and preprocessing the AIS data, so that maritime data which can be directly used for calculation is provided. The operation server is used for providing ship coverage density calculation service, ship communication distance reachable service and ship communication network coverage service based on the maritime data provided by the data server. The service center is used for calling ship coverage density calculation service, ship communication distance reachable service and ship communication network coverage service of the operation service end and storing operation service results.
As a preferred embodiment of the present invention, the system further includes an application client configured to display the operation service result, where the application client includes a programming drawing program centered on the visualization system, and the programming drawing program is configured to present a ship coverage density calculation service result, a ship communication distance reachable service result, and a ship communication network coverage service result.
Specifically, the density calculation service, the distance reachable service and the communication network coverage service are used for displaying the obtained data in a visual form, and the data result is programmed and drawn by using a python language, so that the density distribution, the communicable distance and the communication coverage range of the ship under the current condition are clearly displayed. And the dynamic distribution coverage condition of the ship is illustrated in the modes of pictures and animations.
As a preferred embodiment of the present invention, the data service side preprocesses the AIS data, including:
s001, carrying out examination and verification work on the received AIS data, deleting wrong information and information with null values, and converting the data format into a common format;
s002, slicing the data according to needs, selecting effective information, and storing the data by taking the ship code as a main key;
and S003, reserving the primary key value appearing in the slice for the last time, deleting the repeated primary key value, and finally storing the information into a new table.
Specifically, the data server is used for executing the processes of checking, correcting and screening the collected AIS data. The method comprises the steps of firstly carrying out examination and verification work on AIS data, judging whether null values and negative numbers exist in the data, then deleting wrong information and null value information, and converting the data format into a common format. Slicing the data according to the needs, selecting effective information needed to be used, and storing the data by taking the ship code as a main key. And (4) reserving the primary key value appearing in the slice for the last time, deleting the repeated primary key value, and finally storing the information into a new table.
As a preferred embodiment of the present invention, the operation server providing a ship coverage density calculation service includes:
s101, acquiring ship position information and a ship communication distance by the data server;
s102, calculating a ship communication coverage area by taking a certain ship as a center and the communication distance of the ship as a radius;
s103, calculating the ship coverage density according to the number of ships in the ship communication coverage range.
Specifically, the ship coverage density is the number of ships covered by the ship in a defined area, and the ship coverage density also has a dynamic change trend along with the movement of the ship. And calculating the communication coverage area of the ship by taking the ship as a center and the communication distance as a radius, counting the number of the ships in the coverage area, and calculating the coverage density of the ship. The ship coverage density can not only represent the number of ships covered by the ship at the current position, but also grasp the traffic condition of the ship in the communication range, and select a proper ship for networking communication.
The single-hop signal transmission distance is calculated as follows:
Figure BDA0003413744040000061
wherein L isVThe transmission loss value of a signal from the signal transmission power to the sensitivity value of a receiver, i.e. the maximum value of the receivable loss of the signal, is expressed as LV10lg (P/(1mW)) -s, P being the signal transmission power and s being the receiver sensitivity. L isbFor marine signal transmission fundamental losses, denoted Lb139.3-E +20lgf dB, E is the field strength (dB (μ V/m)) of 1kW e.r.p, and f is the signal frequency (MHz).
The number of ships within the communication distance coverage of each ship in the sea area is aggregated as follows:
N＝{n1,n2,n3,…,nj}
wherein N is the coverage set of all ships in the current area, N is the number in the ship communication coverage area, and j is the MMSI of the ship.
The number of different vessels covered at different time slices within time T is expressed as:
Figure BDA0003413744040000062
wherein T is the number of slices with the statistical time i as the time T.
The ship dynamic coverage density expression is as follows:
Figure BDA0003413744040000063
where Den is the dynamic ship coverage density, and G (i, j, N (n)) is the number of ship j covered n in time slice i. l is the upper limit of the transmission radius of the single-hop signal.
As a preferred embodiment of the present invention, the operation server providing a ship communication distance reachable service includes:
s201, acquiring a ship single-hop communication distance by the data server;
s202, selecting a communication direction by an initial communication ship and planning a communication area, wherein the communication area is an area which is planned by taking the initial ship as a center and taking a ship single-hop communication distance as a radius in a parallel communication direction, and all ships in the communication area are to-be-candidate ships;
s203, calculating the distance between the initial ship and the ship to be candidate, if the distance is smaller than the single-hop communication distance of the ship, adding the corresponding ship to be candidate to a candidate table, and executing S204; if the distance is larger than the ship single-hop communication distance, setting the initial ship as a terminal ship, and executing S205;
s204, selecting the ship node with the largest distance as a destination ship based on the candidate table, setting the destination ship as a new initial ship, deleting ship information in the candidate table in the candidate ship to be candidate at the moment, and executing S203;
s205, calculating the distance between the initial communication ship and the final ship, and taking the sum of the distance between the initial communication ship and the final ship and the single-hop communication distance of the ship as the final communication reachable distance.
Specifically, the ship communication distance can reach a maximum distance which not only represents the ship single-hop communication distance, but also can calculate the uninterrupted continuous communication of the ship along a certain direction. The invention judges whether the communicable condition is met by utilizing the distance between the single-hop ships according to the distance calculation formula. And calculating the communication distance of the multi-hop ship through the intermediate ships in the continuous coverage range, and knowing the communication condition of the ship in the direction, so that a proper ship is selected as a relay node in the distance to forward the message until a target ship or the farthest ship.
In the invention, the calculation formula of the distance between the single-jump ships is shown as the following formula:
Figure BDA0003413744040000071
wherein D represents the distance between the vessels, R represents the earth radius, (lon)o,lato) Is the initial ship longitude and latitude, (lon)t,latt) And the longitude and latitude of the target ship.
Further, the multi-hop ship communication distance can be achieved by the following steps:
inputting: initial communication ship position (lon)o,lato) Harmony course (cog)
Step 1, screening ships in a course range and storing the ships in a candidate list
Step 2, calculating the distance between the initial ship and the candidate ship
(1) If D < r:
adding ship information and distance to the candidate table, executing step 3
(2) If all D > r:
setting an initial vessel as a terminal vessel
Quit the calculation and execute step 6
Step 3, comparing and selecting the ship nodes with the largest distance
Step 4, setting the ship node with the largest distance as the next initial node
Step 5, ship information of the candidate table in the area is deleted, and step 2 is executed
Step 6, calculating the distance between the initial communication ship and the final communication ship and setting the communication radius as the final communication reachable distance
And (3) outputting: maximum communicable distance of initial communication ship
As a preferred embodiment of the present invention, the operation server providing a ship communication network coverage service includes:
s301, determining a monitoring range, and acquiring ship position information and a ship single-hop communication distance in the detection range by the data server;
s302, calculating a communication coverage range of each ship node based on ship position information and a ship single-hop communication distance, wherein the communication coverage range is a circular area taking a ship position as a center and the ship single-hop communication distance as a radius;
and S303, communicating the communication coverage areas of all the ships in the monitoring range to form a communication network, and counting the communication network coverage area to obtain the maximum communication network range of the ships in the monitoring range.
Specifically, the method calculates the ship communication network coverage area to adapt to different ship distribution conditions. The distribution of a single ship, the distribution when two ships meet, the concentrated distribution of multiple ships and the distribution of ships in a fixed area.
In the first embodiment, the single ship communication coverage area is a circle area with the current ship as an important communication distance as a radius.
In a second embodiment, the communication areas where two ships meet are overlapped, and the traffic coverage area of the two ships is calculated as shown in equation 1:
S1,2＝S1+S2-S1∩S2＝2πr2-Sshadow (1)
wherein S1,2Is the total coverage area of two vessels, S1，S2Are respectively a ship O1，O2Communication area, r is ship communication radius, SshadowFor the two-ship communication overlapping area, the schematic diagram is shown in fig. 3, and the calculation formula of the overlapping area is as follows:
Figure BDA0003413744040000081
wherein
Figure BDA0003413744040000082
Ship O1And the sector area of the city enclosed by the intersection points A and B of the two ships,
Figure BDA0003413744040000083
for ships O1And the triangular area of the city surrounded by the intersection points of the two ships,
Figure BDA0003413744040000084
and
Figure BDA0003413744040000085
are respectively a ship O2The sector area and the triangular area of the intersection point enclosing city, d is the distance between two ships, r1、r2Respectively the communication radius of two ships.
In a third embodiment, in the case of centralized distribution of multiple ships, the ships cover each other, the communication areas overlap each other, and multiple calculations and overlap removal are required to obtain a final multiple-ship communication coverage area, that is, a union of ship communication coverage, where a calculation formula is shown in formula 2:
Figure BDA0003413744040000091
wherein SnThe total area is covered for multi-ship communication, n is the number of distributed ships,
Figure BDA0003413744040000092
is the sum of the areas of the ships without overlapping,
Figure BDA0003413744040000093
the sum of the areas of the multiple ships overlapped with each other.
For the ship distribution situation within the specified area, in order to accurately calculate the communication coverage situation of the ship within the area, the ship coverage area outside the specified area should be removed, and a schematic diagram is shown in fig. 4, so that further calculation should be performed on the basis of equation (2), as shown in equation (3), and a calculation flow is shown in fig. 5:
Figure BDA0003413744040000094
Srealfor the actual communication coverage of the ship in the defined area, SoutThe area covered by the ship outside the area. Since the ship can not determine how much area covered by the ship is outside the specified area due to the continuous sailing movement of the ship, the area of the part is uniformly designated as SoutHowever, the calculation method is the same as S in the formula (1)shadowSo that in practical situation, the number and position of edge ships are counted to obtain SoutAnd further obtaining accurate ship communication coverage area in the specified area range.
The solution of the invention is further illustrated by the following specific application examples.
The invention takes the AIS information of a day collected by a certain maritime information center as a data source, and displays the obtained result in a drawing form through operations such as data processing, density calculation, distance calculation, communication coverage calculation and the like.
And inputting the AIS information data into a ship dynamic distribution coverage service module, and cleaning and calculating the data.
The first step is as follows: the data information module cleans the AIS data. Checking the correctness and the completeness of the data, and eliminating errors and lacking information; screening out data columns required by the modules; converting the data into a conventional format; saving the data to a new table for subsequent use.
The second step is that: and calculating the ship coverage density.
The sea area range is defined in a targeted manner, and the longitude and latitude of the area are defined; further screening the cleaned data, and selecting ship data in the region; the ship coverage density was calculated for each ship, with some of the results shown in the table below.
TABLE 1 Ship calculated Ship coverage Density calculation results
MMSI Longitude (G) Latitude Density of
273197200 122.6 31.02 99
440812000 122.94 31.15 98
414249000 123.01 30.19 91
477301900 122.81 30.22 107
414317000 123.01 31.12 94
370908000 122.96 30.9 115
477767600 122.8 31.09 103
The third step: and calculating the communication distance of the ship.
Selecting a ship as a starting node in the data;
selecting a communication direction and defining a signal coverage range;
calculating the distance (shown in the table) between the initial node and other ships, and selecting the farthest ship node;
TABLE 2 Ship spacing
273197200 440812000 414249000 477301900 414317000 370908000 477767600
273197200 0 39 68 53 46 41 23
440812000 39 0 59 58 8 15 16
414249000 68 59 0 22 56 43 59
477301900 53 58 22 0 59 44 52
414317000 46 8 56 59 0 14 23
370908000 41 15 43 44 14 0 21
477767600 23 16 59 52 23 21 0
Setting the farthest ship node as an initial node, and repeating the steps until the covering is finished;
calculating the communication distance between the initial node and the final farthest ship node, namely the farthest communication distance of the ship
And (3) displaying a distance result:
…
an initial ship: [412206380,122.53,29.82]
Candidate ships: [[414249000,123.01,30.19],[414381320,123.05,30.14],[412209130,123.02,30.22],[477218200,123.1,30.17],[477524400,123.21,30.1],[414785000,123.13,30.21],[414253000,123.0,30.18],[215219000,123.5,29.98],[563101200,123.2,30.07],[477312800,123.36,30.13],[371206000,123.28,30.22],[477776500,123.32,30.13],[372805000,123.88,29.85]]
Maximum distance: 54
The next initial vessel: [413698510,122.83,30.23]
Candidate ships: [[215219000,123.5,29.98],[372805000,123.88,29.85]]
Maximum distance: 52
The next initial vessel: [477312800,123.36,30.13]
Candidate ships: [[372805000,123.88,29.85]]
Maximum distance: 21
The next initial vessel: [215219000,123.5,29.98]
Candidate ships: []
Maximum distance: 39
The next initial vessel: [372805000,123.88,29.85]
Candidate ships: []
Final Ship 123.8829.85
Final communication distance: 143nm
The fourth step: a ship communication coverage calculation service.
Screening ship node information in a defined sea area range;
calculating the ship communication total coverage area minus the communication overlapping area and the communication coverage area outside the range;
comparing the coverage area with the range area to obtain the ship communication coverage ratio in the range;
communication coverage ratio of ships in a defined range at different times:
[0.99683,0.99964,0.98908,1.0,0.80033,0.99211,0.7786,0.77294,0.67971,0.57008,0.72474,0.71953,0.65459,0.54557,0.90032,0.7384,0.81755,0.78867,0.73815,0.70749,0.74283,0.85639,0.82135,0.50429,0.87894,0.97557,0.96652,0.57928,0.61234,0.59984,0.52183,0.52079,0.53774,0.70917,0.96464,0.99939,0.9976,1.0,0.98909,0.98086,0.98049,0.99984,0.99647,0.97959,0.92749,0.91327,0.94756,0.92379,0.90022,0.91709,0.93584,0.95525,0.96055,0.96833,0.95216,0.98738,0.78192,0.9937,0.90958,0.78286,0.98015,0.9426,0.95215,0.95906,0.9641,0.96013,0.96338,0.96502,0.96829,0.97245,0.99714,0.96407,0.92997,0.96764,0.91695,0.80031,0.97097,0.9219,0.91316,0.93113,0.95274,0.95201,0.99183,0.91625,0.86736,0.8668,0.85567,0.86459,0.82856,0.98201,0.82744,0.93419,0.97567,0.96839,0.96335,0.9549,0.91723,0.93182,0.98574,0.98901,0.9916,0.99371,0.99464,0.99686,0.99859,0.99948,0.99998,0.99946,1.0,1.0,0.99602,1.0,1.0,0.98885,0.98332,0.97713,0.96203,0.93844,0.84984,0.80464,0.80441,0.79536,0.79019,0.80014,0.78946,0.79489,0.78319,0.78627,1.0,1.0,0.53616,0.4753,0.77449,0.69973,0.69505,0.55772,0.8589,0.82495,0.82333,0.83118,0.86715,0.87745,0.88795,0.89631]
the fifth step: and visually displaying the calculation result.
Inputting the ship density, the communication distance and the communication coverage area obtained by calculation into a visual display module; and respectively drawing the calculation results to obtain each result display graph.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (4)

1. A ship dynamic distribution monitoring system based on offshore AIS data is characterized by mainly comprising:
receiving AIS data sent by a ship and preprocessing the AIS data so as to provide a data server side of the marine data which can be directly used for calculation;
an operation server for providing a ship coverage density calculation service, a ship communication distance reachable service and a ship communication network coverage service based on the marine data provided by the data server, and
and the service center is used for calling the ship coverage density calculation service, the ship communication distance reachable service and the ship communication network coverage service of the operation service end and storing the operation service result.
2. The marine AIS data-based ship dynamic distribution monitoring system according to claim 1, wherein the operation server provides ship coverage density calculation services, and comprises:
s101, acquiring ship position information and a ship communication distance by the data server;
s102, calculating a ship communication coverage area by taking a certain ship as a center and the communication distance of the ship as a radius;
s103, calculating the ship coverage density according to the number of ships in the ship communication coverage range.
3. The marine AIS data-based ship dynamic distribution monitoring system according to claim 1, wherein the operation server provides ship communication distance reachable services, comprising:
s201, acquiring a ship single-hop communication distance by the data server;
s202, selecting a communication direction by an initial communication ship and planning a communication area, wherein the communication area is an area which is planned by taking the initial ship as a center and taking a ship single-hop communication distance as a radius in a parallel communication direction, and all ships in the communication area are to-be-candidate ships;
s203, calculating the distance between the initial ship and the ship to be candidate, if the distance is smaller than the single-hop communication distance of the ship, adding the corresponding ship to be candidate to a candidate table, and executing S204; if the distance is larger than the ship single-hop communication distance, setting the initial ship as a terminal ship, and executing S205;
s204, selecting the ship node with the largest distance as a destination ship based on the candidate table, setting the destination ship as a new initial ship, deleting ship information in the candidate table in the candidate ship to be candidate at the moment, and executing S203;
s205, calculating the distance between the initial communication ship and the final ship, and taking the sum of the distance between the initial communication ship and the final ship and the single-hop communication distance of the ship as the final communication reachable distance.
4. The marine AIS data-based ship dynamic distribution monitoring system according to claim 1, wherein the operation server provides ship communication network coverage services, and comprises:
s301, determining a monitoring range, and acquiring ship position information and a ship single-hop communication distance in the detection range by the data server;
s302, calculating a communication coverage range of each ship node based on ship position information and a ship single-hop communication distance, wherein the communication coverage range is a circular area taking a ship position as a center and the ship single-hop communication distance as a radius;
and S303, communicating the communication coverage areas of all the ships in the monitoring range to form a communication network, and counting the communication network coverage area to obtain the maximum communication network range of the ships in the monitoring range.
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Citations (3)

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Publication number Priority date Publication date Assignee Title
KR20150117491A (en) * 2014-04-10 2015-10-20 국방과학연구소 Position-based routing method and apparatus using AIS for maritime networking
CN206164533U (en) * 2016-11-18 2017-05-10 福建航天星联信息科技有限公司 Boats and ships message transmission system based on AIS technique and big dipper satellite communication technique
CN113301504A (en) * 2021-05-21 2021-08-24 新诺北斗航科信息技术（厦门）股份有限公司 AIS mobile base station equipment cluster remote control method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150117491A (en) * 2014-04-10 2015-10-20 국방과학연구소 Position-based routing method and apparatus using AIS for maritime networking
CN206164533U (en) * 2016-11-18 2017-05-10 福建航天星联信息科技有限公司 Boats and ships message transmission system based on AIS technique and big dipper satellite communication technique
CN113301504A (en) * 2021-05-21 2021-08-24 新诺北斗航科信息技术（厦门）股份有限公司 AIS mobile base station equipment cluster remote control method

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