186 results about "Ship dynamics" patented technology

The invention relates to an unmanned ship dynamic obstacle avoidance algorithm based on a speed obstacle method and a dynamic window method. On the basis of the speed obstacle method, the unmanned ship dynamic obstacle avoidance algorithm considers the characteristic of the ship's large length-width ratio, uses the ellipses to represent the unmanned ship and the obstacle, and gives a method for solving the ellipse tangents; considering the kinematic performance of the unmanned ship, only the speed and direction that the unmanned ship can reach in a given time is used to calculate obstacle avoidance; the starting time of obstacle avoidance is determined by comparing the time of collision with the time required for the unmanned ship to avoid the obstacle, and the obstacle avoidance is endedby determining that the unmanned ship is safely moving in the desired direction of the navigation and moving in the direction of the target point; and the virtual obstacle is added according to the speed and movement direction error of the obstacle to reduce the influence of the obstacle motion information error. The unmanned ship dynamic obstacle avoidance algorithm can ensure that the unmanned ship can effectively avoid the static and dynamic obstacles encountered during the autonomous navigation on the sea surface.

The invention relates to the field of dynamic positioning control, and specifically relates to a filtering method in a ship dynamic positioning system. The filtering method comprises the following steps of: (1) measuring the position and the acceleration of a ship, and transferring data into a unified coordinate system; (2) establishing a ship model containing the high-frequency acceleration; (3) establishing a Kalman filter capable of estimating the position, the speed and the acceleration; and (4) based on the measured position and acceleration, filtering the high-frequency interference by using the Kalman filter to obtain low-frequency ship position speed and acceleration speed required by the ship dynamic positioning system, and sending data to the dynamic positioning system. The method can be used for estimating the ship low-frequency position speed and acceleration required by the ship, and precise ship position, speed and acceleration information can be obtained by performing comprehensive filtering and estimating on the position and the acceleration.

The invention belongs to the technical field of ship engineering and relates to a ship dynamic positioning control method. The ship dynamic positioning control method comprises the following steps that model identification is conducted on a ship dynamic movement model, and a support vector machine predicting model is established; surging, swaying and yawing directions of a ship power positioning system are preset according to expected positions and postures, the support vector machine predicting model is embedded into a general predict controller, and the surging, swaying and yawing movements are respectively controlled; the general predict controller applies three torques in the surging, swaying and yawing directions to the ship dynamic movement model through a thrust distribution module and feeds back surging and swaying displacement and a yawing angle, and a closed-loop feedback control system is formed to control the ship power positioning system. The ship dynamic positioning control method has the advantages of multiple steps of predicting, rolling optimization and feedback compensation mechanisms, a good control effect on a ship, high positioning precision and the like. In addition, the ship dynamic positioning control method can be automatically applied to ship loading, sea condition variation and the like.

The invention discloses a ship energy efficiency monitoring management system, which relates to the technical field of ship energy conservation. The system comprises a sensing function module, a dataacquisition module, a remote transmission module, an energy efficiency analysis module, an auxiliary decision module and a ship management module. The sensing function module converts the collected energy efficiency physical signals into electrical signals. The data acquisition module converts the electrical signal into digital signal. The remote transmission module remotely transmits the ship-side monitoring data to the shore-side, and remotely controls the ship-side main controller according to the shore-side control command. The energy efficiency analysis module calculates and stores monitoring data in real time, and automatically generates energy efficiency statistical reports; The assistant decision-making module realizes the speed optimization and pitch optimization based on big dataanalysis as well as the early warning of entering the emission control area. The ship management module inputs the ship operation information at the ship end and inquires the ship dynamics at the shore end remotely. Reduce carbon dioxide emissions from ships, improve energy efficiency and reduce operating costs.

The invention discloses an automatic identification and monitoring system for ships in sea area of a 110kv submarine cable. The automatic identification and monitoring system for the ships in sea area of the 110kv submarine cable comprises a platform, a support system and six functional modules, wherein the platform is a unified frame structure platform functioning as a unified plug-in type platform, a unified date model, a unified data exchange bus and a unified data interface; the support system is an AIS (Automatic Identification System) ship dynamic sub-system; the six functional modules are an electronic chart display platform module, a data receive and interface module, a submarine cable area alarming module, a history playback module, a thematic element management module and an alarm video linkage module. According to the automatic identification and monitoring system for ships in the sea area of the 110kv submarine cable, on basis of achieving AIS ship monitoring in the operation region of the submarine cable, all-weather automatic and intelligent monitoring and early-warning to the operation region of the submarine cable is achieved by data intelligent analysis and automatic warning functions, so that accidents caused by that ships anchor in the submarine cable region are basically avoided, operation security of the submarine cable is ensured, and power supply quality of the submarine cable is improved.

The invention discloses a design method for path tracking guidance and control structures of constrained unmanned ships. The method includes the following steps: designing a disturbance observer; designing a LOS guidance law module; designing a heading control module; and designing a speed control module. Estimation can be performed on lumped uncertainty consisting of constrained unmanned ship dynamics modeling uncertainty and external disturbance brought by marine environments by adopting the disturbance observer, so that the method is less in required adjustment parameter and easy to adjustparameters; the calculating load of a guidance and control structure can be effectively reduced by sending the estimated value of the lumped uncertainty to the heading control module and the speed control module to control a ship to move, so that rapid convergence can be realized, the anti-interference capabilities of the guidance and control structure can be enhanced, and good control performancecan be achieved; and through an online scrolling optimization and feedback correction strategy, the guidance and control structure of a constrained unmanned ship can fully utilize allowed control motion, so that performance can be enhanced.

The invention provides a ship dynamic positioning speed estimation system and method based on interference compensation. The system comprises a dynamic positioning ship (2), a propeller (3), a sensor system (4), an external force estimation system (6) and a state observer (9). The sensor system (4) comprises a wind sensor (5), a compass (11) and a DGPS (12). The external force estimation system (6) comprises a thrust compensator (7), a wind power compensator (10) and a slow-changing interference compensator (8). On the basis of the non-linear passive state observer, a resultant force compensation system is added, through modeling analysis on system and environment force, an interference observer is used for carrying out approaching on slow-changing interference, compensation is carried out in an observing system, the complexity of the state observer is lowered, speed observation accuracy is improved, and influence on ship state observing from slow-changing interference force is lowered.

The invention discloses a ship dynamic positioning method based on an improved strong tracking filter state observer. The method comprises the following steps: acquiring the position and heading of a ship; filtering noise part in the position and heading of the ship by utilizing the improved strong tracking filter state observer, and transmitting an obtained estimated value of the position and heading of the ship meeting the precision requirement to a PID controller; outputting a control force and a torque according to an expected value of the position and heading of the ship and the received information by the PID controller, and controlling the motion of the ship. By adopting the method, under the situation that the external interference is suddenly changed, the tracking filter effect is better, and the stability of the ship can be improved.

The invention discloses a ship dynamic positioning control method. To be specific, the method is implemented as follows: S1, establishing a coordinate; S2, carrying out heading determination; S3, carrying out real-time comparison; S4, carrying out parameter compensation; S5, carrying out thrust distribution; and S6, carrying out real-time correction. According to the invention, a planar two-dimensional coordinate system is established on a sea surface by using the real-time position of a ship as an original point; a set route is divided into a plurality of reference points; the real-time stateof the ship is detected and comparison is carried out on reference points on the route to obtain an offset with the set route; a parameter needing compensation is calculated by using a computer; a propelling system is driven to provide power needed by each direction; and the heading of the ship is adjusted. Parameter comparison is carried out on the reference points continuously to adjust the actual route of the ship in real time during the heading process of the ship; the more reference point segmented from the set route, the shorter the correction interval time; the matching degree betweenthe actual route and the set route is increased; and the precision of dynamic positioning is enhanced.

The invention discloses an unmanned surface ship dynamic collision avoidance method based on track re-planning. The method comprises the following steps of acquiring navigation information of a neighborhood ship and posture information of an unmanned ship through a ship-borne sensor; constructing a collision cone between the unmanned ship and the neighborhood ship; introducing uncertainty of motion information observation of the neighborhood ship, and applying a layer of soft constraints to the collision cone; applying a speed and a heading limited range of the unmanned ship; obtaining a finalcandidate speed set; introducing a cost function to select an optimal collision avoidance speed; and using the optimal collision avoidance speed to carry out inner loop of navigation simulation, andacquiring a track re-planning point of unmanned ship dynamic collision avoidance. The dynamic collision avoidance decision of the unmanned surface ship is output in a form of track re-planning, whichsatisfies a constraint of international regulations for preventing collisions at sea. The method can well adapt to steering control of the unmanned ship, and a dynamic collision avoidance requirementof the unmanned ship is satisfied.

The invention relates to a multi-model self-adaptive fusion filtering method of a ship dynamic positioning system and belongs to the technical field of ship dynamic positioning. The method includes the steps: (1), building a ship three-degree-of-freedom low-frequency and high-frequency motion model, and acquiring a filter state formula and a measuring formula; (2), utilizing a differential global positioning system and a platform compass to measure position information and a heading angle, and collecting information in real time; (3), utilizing prior information and posterior information to initialize input of a model-based filter; (4), on the basis of a system model, utilizing a strong tracking filter and a Sage-Husa filter for parallel filtering; (5), subjecting the model to probability updating, and utilizing residual covariance output by the filters to calculate model probability matched with the model; (6), according to the model probability, acquiring fusion output of multi-model state estimation, namely ship position and heading information. The multi-model self-adaptive fusion filtering method has the advantages of strong robustness, high accuracy in Sage-Husa filter state estimation, stable system, high positioning accuracy and the like.

The invention relates to an intelligent optimization method for ship dynamic positioning thrust distribution. The method comprises steps that S1, the layout of a ship propulsion unit is determined, parameters of each thruster are loaded, and the parameters of the thruster include the variable range of the thruster thrust direction, the variable range of the thrust magnitude, the change rate rangeof the thrust direction and the change rate range of the thrust magnitude; S2, change rate restriction of a thruster state vector is acquired according to the parameters of each thruster and a presentstate, after a target control instruction is received, a multi-step optimization problem model is established; S3, a global optimal solution of a state of the thruster in the long-term change range is acquired through the genetic algorithm; and S4, an optimal multi-step decision sequence for driving the thruster is acquired, and distribution decisions are outputted. Compared with the prior art, problems of slow convergence and rapid degradation of population diversity of the genetic algorithm are solved.

The invention discloses an assembling method for controller area network (CAN) data frames applied in a ship dynamic information acquisition device, and relates to the field of CAN buses of the ship dynamic information acquisition. The assembling method comprises the following steps: setting a unique identity (ID) for each equipment chassis and each acquisition board inside each equipment chassis, setting numbers for a channel of each acquisition board in order, wherein each route of data of multiple routes of the data sent by each acquisition board corresponds to a channel number, and packaging the numbers of the equipment chassis ID, the acquisition board ID inside the equipment chassis, and the acquisition board channel in the CAN data frames. The assembling method for the CAN data frames applied in the ship dynamic information acquisition device realizes confirmation of identifiers in the CAN data frames and distribution of data bytes, and is capable of satisfying requirements of CAN communication of the ship dynamic information acquisition device.

The invention provides a method for predicting a ship trajectory. The method at least comprises the steps that current related information of a target ship is obtained from ship actual measurement data,wherein the related information at least comprises ship information,a course angle and an instant navigational speed; a ship position state is predicted through a distributed extend Kalman filter algorithm according to current information of the ship,wherein the prediction processes comprise that a discrete nonlinear system is established to be used for describing a target ship state and sensormeasurement,a variance constraint method is used for determine a Kalman gain matrix of each time node,state estimation and upper-bound matrix of the ship at a current moment are calculated to predictstate estimation and upper-bound matrix of the ship at the next moment,the state estimation and upper bound estimation of the ship are updated according to the state estimation and upper-bound matrixof the ship at the next moment,nonlinear consistency Kalman filtering is carried out by adopting a preset ship dynamic model to obtain ship position information at the next moment after filtering.

The invention discloses a ship sailing safety assessment system, which comprises a main frame, a shipping line design module, a ship motion math model module, a ship dynamic parameter acquisition module, a scoring module and a historical record and replay module. Computer simulation technology is adopted, and an automatic ship sailing safety assessment and simulation system which can provide similar marine situations is developed. Different ship types and different wind current conditions can be set, actual marine navigation conditions can be simulated, and thus vividness and richness of assessment can be enhanced. Ship sailing operation assessment can be carried out without restrictions of time and water areas. Whether in a one-way channel or in a two-way channel, an automatic assessment function after sailing is over can be realized, bad influences of subjective factors of an examiner on the assessment result can be avoided, workload of checking ship operation records by the examiner can be reduced, external other sailing data can be guided to the system of the invention for assessment, and the assessment level and the assessment quality are improved.

The invention discloses a control method and system for a propulsion motor of a semi-submerged ship dynamic positioning system. The method comprises the following steps: acquiring a three-phase current on a stator winding of the motor, and converting into a current in a rotating coordinate system; establishing a kinetic equation of the propulsion motor of the semi-submerged ship dynamic positioning system; performing dynamic linearization, and obtaining a data model; calculating a pseudo-partial derivative estimation law of an external speed ring; designing a model-free adaptive sliding mode controller of the external speed ring; designing a PI controller for an internal electric current loop; and performing park inverse transformation on output of the PI controller for the internal electric current loop, obtaining a voltage value in a two-phase static coordinate system, obtaining a control signal for an inverter by virtue of a space vector pulse width modulation algorithm, outputtinga corresponding three-phase voltage signal by the inverter, applying to the stator winding of the propulsion motor, and performing speed adjustment on the propulsion motor. The method and system whichare disclosed by the invention have stronger anti-interference performance and robustness, improve rotational speed and torque control precision of the propulsion motor and meet the requirement of the semi-submerged ship dynamic positioning system on a steady state error.

The invention relates to a three-redundant ship dynamic positioning heading measurement method based on an improved voting algorithm. The method comprises the following steps: 1, measuring a heading value: 2, adopting a variance self-learning weighting method to obtain respective weight values; 3, carrying out weighting on the measured mean, respectively subtracting a weighted mean from an input value of a sensor, calculating an absolute value, and comparing the absolute value with a threshold t1, wherein the absolute value less than the threshold t1 is considered that no failure exists so as to directly perform data fusion, and it is considered that the failure exists if the absolute value greater than t1 exists, such that failure redetermination is required to be performed; 4, obtaining difference between the current input value and the previous output value, and calculating an absolute value, wherein a normal state is determined when the absolute value is less than t2 and a heading change rate at the current time is similar to heading change rates of the current rudder angle and the ship speed, and otherwise a failure is determined; and 5, carrying out weighting on the remaining data reassignment weight values after excluding the failure data. With the present invention, a lot of failure determinations are achieved, such that the output result has high precision.

The invention relates to a sail assisted ship control system which comprises a speed setting module, an efficiency optimization module, a speed control module, a ship dynamic-parameter acquisition module, a speed regulator module and a pitch control module. The efficiency optimization module and the speed control module are respectively connected with the ship dynamic-parameter acquisition module, the speed setting module is connected with the speed control module, and the efficiency optimization module is connected with the speed regulator module and the pitch control module respectively. By the speed control module, the corresponding optimum revolution speed value of a main gas turbine and optimum pitch value of a propeller are calculated by the aid of the latest integral thrust formula according to the integral sail thrust detected in real time, so that the navigation speed of ships keep stable while the highest fuel efficiency of the main gas turbine is guaranteed. Further, operation cost of the ships is reduced effectively, energy consumption and carbon emission are reduced, and the development principle of saving energy and reducing consumption for the current ship industry is met.

The invention discloses a portable hand-operated box structure of a ship dynamic positioning system and an information acquisition and processing method. A hand-operated box is connected with a control console computer through an aviation plug, and a working power supply is acquired. Voltage conversion of the power supply is finished on an information acquisition plate, and power is supplied to an indication lamp on a hand-operated box panel, a PC 104 embedded industrial main board and the information acquisition plate. A single-chip microcomputer is used as a master control chip for acquiring simulation signals of a key and a hand-operated lever and controlling the indication lamp. Most elements are SMD elements, so that the size of a PCB is effectively reduced. A liquid crystal display on the hand-operated box dynamically displays information of ship motion states so that the running state can be conveniently monitored in real time, and control signals can be sent out at the corresponding moment. Input of transverse, longitudinal and yawing control instructions is achieved through the three-freedom-degree hand-operated lever. Due to the fact that the embedded structure is adopted in the portable hand-operated box and the signal acquisition plate and the PC 104 main board are fixed to the bottom of the hand-operated box, heat can be dissipated in time, and safe and reliable running of the system is guaranteed. The hand-operated box is simpler in structure, easier to operate and more convenient to install.

The invention provides a low-power coastal inland ship management system, and the system is characterized in that each ship is provided with a ship terminal; a coastline / bank line is provided with a plurality of bank base stations; a wireless spread spectrum network is employed for the communication between the ship terminals and the bank base stations, and a start-shaped network structure is employed; the ship terminals are in a sleep state in most of the time; when a ship enters the signal coverage of the base stations, the corresponding ship terminal is wakened up by a wakening command sent by the corresponding bank base station in a timing manner, and transmits ship information to the bank base station, and the bank base station transmits the received ship information to a cloud storage and a cloud server through an optical fiber, or a GPRS or a 4G network, and displays the information on a client; and a user can query various types of ship information through the client. The system achieves the functions of offshore ship positioning, ship dynamic monitoring and offshore data exchange, is low in power consumption, is high in precision, is resistant to disassembly, is low in cost, and facilitates the popularization and application.

The invention discloses a three-dimensional ship dynamic display method based on multiscale rendering and fitting. The three-dimensional ship dynamic display method comprises the following steps: acquiring the type, position, course and navigational speed information of a real-time ship target, and combining computer system configuration to dynamically configure a corresponding three-dimensional model and icon information as ship display factors; based on viewing distance and intensive degree, switching the ship visibility and three-dimensional display way under different scales to ensure dynamic unload of the model and other resources; according to the viewing distance, position, navigational speed and other information, determining the interpolation intervals and fitting routes under different conditions, and carrying out multiscale forward calculation, straight line interpolation or curve fitting under different pole conditions to improve the processing efficiency and ship navigation display smoothness so as to finally realize the efficient dynamic three-dimensional ship display effect and combine overall performance optimization and detail feature display.

The invention provides a marine environment and ship movement monitoring and forecasting system and a monitoring and forecasting method. A marine environment monitoring module provides wind wave datainformation of the marine environment; A ship movement monitoring module provides ship movement data information acquired by the ship movement monitoring system; the ship movement forecasting module forecasts ship movement response in tens of minutes in the future according to collected sea wave monitoring data and ship movement monitoring data information through a wave numerical forecasting model, a ship dynamic response model, a time sequence analysis method and an artificial intelligence method, and a basis is provided for offshore operation decision making. The marine communication satellite module receives the forecast data transmitted by the system and stores the information; the shipborne terminal module is connected with the marine communication satellite module and receives monitoring and forecasting data information stored by a marine communication satellite. According to the invention, the problem that forecast data cannot be transmitted due to the fact that a network cannot cover in the prior art can be effectively solved, and remote ship movement forecast can be realized.

The invention discloses a submarine cable surveillance protection system. The submarine cable surveillance protection system comprises a shore-based submarine cable surveillance center, a submarine cable positioning system, a ship monitoring system, a wireless communication system and a submarine cable protection system, wherein the submarine cable positioning system is used for acquiring positioning information of a submarine cable, reporting the positioning information to the shore-based submarine cable surveillance center, and planning a submarine cable protection area through the shore-based submarine cable surveillance center; the ship monitoring system is arranged on sea islands or on shores, and used for acquiring navigation information of a ship and returning the navigation information of the ship to the shore-based submarine cable surveillance center; the wireless communication system is used to establish an interaction communication link between the submarine cable positioning system, ship monitoring system and the submarine cable protection area and the shore-based submarine cable surveillance center; and the submarine cable protection system is used for carrying out corresponding intervention on the ship which is illegally stopped in the submarine cable protection area. The submarine cable surveillance protection system can carry out submarine cable real time positioning, civil ship dynamic monitoring, improper ship stopping early warning, and law enforcement evidence obtaining, so that stable operation of the submarine power cable is ensured.

The invention discloses a ship dynamic positioning system and a design method thereof. The system comprises N ships, N individual controllers and a communication network; the N ships are in one-to-one correspondence with the N individual controllers, and the N ships are respectively in bidirectional connection with the N individual controllers; the output end of the communication network is connected with the N individual controllers, and the input end of the communication network is connected with the N ships; the individual controller comprises a first-level comparison unit, a second-level comparator unit, a virtual controller, a filter, an adaptive unit and a control unit. The invention provides a multi-ship relative dynamic positioning system, which can guarantee that multiple ships can keep set relative positions and jointly track the given position of a virtual navigator. In comparison with the conventional single-ship positioning control system, the ship dynamic positioning system has wider mission area, higher efficiency and improved system performance, and is suitable for being used in a larger-scale ship control system for a larger number of ships.

The invention provides a double-input multi-output parallel operation on-off gearbox used for boats; a first left input shaft is connected with a second left input shaft through a left input shaft clutch; a left reversing driving gear embedded on the second left input shaft is meshed with a left reversing passive gear on a left output pinion shaft; a left output pinion is meshed with an output gearwheel; the left reversing passive gear is also in gearing mesh with PTO; a first right input shaft is connected with a second right input shaft through a right input shaft clutch; a right reversing driving gear embedded on the second right input shaft is meshed with a right reversing passive gear on a right output pinion shaft; a right output pinion is meshed with an output gearwheel; and the right reversing passive gear is also meshed with a gear on a right PTO clutch. The invention meets the requirements of high reliability, high safety and multi-function of ocean engineering ship dynamic systems, has the characteristics of compact structure, small size, safety, reliability, convenient control and the like, and can achieve the effects of increasing the space for carrying objects, and greatly reducing the construction cost and use cost.

The invention provides a ship dynamic positioning control method based on an inverse system and internal model control. The ship dynamic positioning control method comprises the following steps of 1 establishing a ship dynamic system mathematic model; 2 constructing a pseudo-linear system about a ship; 3 designing an internal model controller of an inner ring; 4 calculating a reference model of a speed ring control system; 5 designing an internal model controller of an outer ring; 6 adding coordinate system transformation; 7 designing parameters of the inner ring controller; 8 designing parameters of the outer ring controller. By means of the ship dynamic positioning control method based on the inverse system and an internal model control algorithm, the problem of ship motion control can be reasonably and efficiently solved, the robustness is good, the positioning accuracy is high, and green control can be achieved.

The invention provides a shipping monitoring system which can monitor a ship itself and can monitor waterway conditions in real time. The system comprises a data processing and commanding center (1), a digital waterway system (2) electrically connected with the data processing and commanding center, a shipping business Beidou / GPS two-mode terminal (3), a ship-mounted intelligent monitoring terminal (4), a VTS waterway management system (5), a CCTV waterway management system (6), a DGPS waterway management system, a shipping lock intelligent scheduling subsystem (8), a ship dynamic monitoring subsystem (9), an intelligent Internet of things shipping logistics information service system (10), a waterway geographic information system (11), a shipping logistics government affair information service subsystem (12) and an unmanned aerial vehicle real-time detection subsystem (13), wherein the unmanned aerial vehicle real-time detection subsystem comprises an underwater detection subsystem and an above-water detection subsystem, the underwater detection subsystem is used for detecting underwater shipping environment, and the above-water detection subsystem is used for detecting above-water shipping environment.

The invention discloses a method for predicting the residual life of ship power equipment. The method comprises the following steps: step 1, collecting data of the ship power equipment; 2, forming two residual life prediction samples; 3, forming two multi-dimensional gray scale residual life prediction samples; 4, substituting the training set into the improved TCN model, and converting multi-dimensional data into a one-dimensional feature vector; 5, deep features of the data are extracted, and the multi-layer fusion model outputs weights of parameters with large influences; 6, obtaining a residual life prediction model, normalizing the test set of the residual life prediction samples, inputting the normalized test set into the residual life prediction model, and outputting health factors; 7, performing linear regression prediction on the output health factor to obtain a health factor at the current operation moment; and 8, predicting the real-time residual life of the ship power equipment. According to the method, equipment part corrosion data is introduced on the basis of traditional service life prediction data, so that prediction errors are reduced.

The invention discloses an AIS-system-based wireless relay network implementing method. The AIS-system-based wireless relay network implementing method comprises the following steps: providing a shore-based AIS base station and wireless relay network ship-borne equipment, wherein the wireless relay network ship-borne equipment comprises a wireless relay network protocol module and an AIS mainframe; according to the shipping dynamic state of a ship in a shipping lane, actively sending an AIS message for monitoring the ship in the shipping lane and automatically forwarding AIS monitoring information of other ships by the wireless relay network ship-borne equipment; setting a forwarding frequency flag bit in a relay message by the wireless relay network protocol module so as to prevent two pieces of equipment from entering an infinite loop state in which the two pieces of equipment repeatedly forward the relay message of the opposite side mutually; periodically broadcasting a coverage identifying message of the AIS base station outwards by the shore-based AIS base station, receiving and indentifying the forwarded ship relay message, and converting the relay message into AIS position information after the relay message is analyzed. After application of the AIS-system-based wireless relay network implementing method, the monitoring ranges of a coastal area and an inland AIS base station can be widened, the AIS monitoring effect on a ship in an inland shipping lane can be improved, communication expenses are not generated and the application value is high.