30 results about "Freeboard" patented technology

The invention belongs to the technical field of ship draft detection, and provides a ship draft real-time detection system which comprises the following steps: establishing a three-dimensional dynamic coordinate system, and updating a water surface reference surface in combination with real-time water level data; calculating water level variation of adjacent frames and compensating a point cloud Z axis; a pure ship body point cloud is separated in combination with a water surface datum plane, ship body reflectivity and a region growing algorithm; fitting a deck plane of the pure ship body point cloud, performing edge detection to extract ship board features, and correcting a side board feature surface; converting the pixel coordinates of the water surface reference surface and superposing the auxiliary lines; positioning a waterline, converting a bow / middle / tail waterline coordinate to a three-dimensional dynamic coordinate system, and calculating an initial draft; the deck Z-axis average coordinate is extracted, and the bow / middle / tail freeboard height is calculated in combination with the water surface datum plane coordinate; the theoretical draft is deduced in combination with the ship type depth, the theoretical draft is compared with the initial draft, the final draft is output, and the ship draft detection precision in the complex water level change environment is improved.

The invention discloses a ship lock hydraulic structure crest elevation scheme recommendation method and device and electronic equipment, and relates to the field of ship lock building designing.The method comprises the steps that feature scales of different lockage ship types are obtained, the feature scales comprise freeboard heights of ships under the full-load condition or the ballast condition or the no-load condition, and based on a freight volume demand analysis result, the feature scales are calculated according to the freeboard heights of the ships under the full-load condition or the ballast condition or the no-load condition; determining the ship type proportion of each lockage ship type, calculating the crest elevation of the ship lock hydraulic structure under different working conditions by adopting a proportionality coefficient algorithm according to the ship type proportion and the freeboard height to obtain a plurality of planned recommendation schemes, and measuring and calculating the investment cost of the ship lock hydraulic structure in each planned recommendation scheme. And selecting the scheme with the lowest investment cost as a target crest elevation recommendation scheme. The technical problems that crest elevation of a ship lock hydraulic structure is determined in a fixed mode in the prior art, freeboard changes of a ship under different working conditions such as full load and ballast are not involved, sailors are inconvenient to go ashore, and the utilization rate is affected are solved.

The invention discloses a swing stopping system and method for an A-type hanging bracket, and belongs to the technical field of ships. The A-type hanging bracket is arranged on a deck of the ship body, and a hoisting device is arranged on the A-type hanging bracket and used for hoisting equipment; the oscillation stopping system comprises a traction device, a guide mechanism and a monitoring device, and the traction device is arranged on the deck and used for pulling the traction rope; the guide mechanism is arranged on the ship body, the traction rope is guided by the guide mechanism to connect the traction device and the equipment, and the traction rope is connected with a lifting point of the equipment to form oblique tension towards the side surface of the ship body on the equipment; the monitoring device is in communication connection with the traction rope and the traction device and used for adjusting the winding and unwinding speed and tension of the traction device on the traction rope, the problem that the A-type hanging bracket equipment shakes in the high freeboard scene is solved, and the operation safety and efficiency are improved.

The invention relates to a novel retracting and releasing mechanism of a dragging body. The mechanism mainly comprises a steel wire rope driving device installed on a ship deck, a throwing arm driven by the device to rotate around a first shaft by a large angle, and a vertical arm hinged to the free end of the throwing arm through a second shaft. The device is characterized in that a hydraulic motor is arranged on a throwing arm to drive a second shaft, and in the throwing or recycling process, the hydraulic motor can synchronously drive a vertical arm to perform reverse compensation rotation, so that the vertical arm is always kept in a vertical posture, and a dragging body with a large dip angle in the air is stably grabbed. The mechanism is further provided with a rigid locking device composed of a grabbing and locking mechanism and a grabbing and locking column, and a cable guide wheel used for protecting the trailing cable. The problem that the posture of the gravity center shift dragging body is difficult to control in the retracting and releasing process is solved, and the device is particularly suitable for high freeboard ships and has the advantages of being stable in releasing, high in safety and high in adaptability.

The invention provides a ship freeboard height detection method and device and electronic equipment. According to the method and the device, the cross-modal alignment parameter for representing the spatial transformation relationship between the image acquisition equipment for acquiring the image data and the laser radar for acquiring the point cloud data is determined based on the point cloud feature of the target ship and the visual feature of the target ship, and the cross-modal alignment parameter, the point cloud feature and the visual feature are further utilized; the freeboard weight distribution used for representing whether the position, corresponding to the target ship, of each feature point in the point cloud features belongs to the freeboard area or not is determined, so that the freeboard area to be detected is accurately focused, and clear freeboard semantic features in the visual features and scale information of the point cloud data are fully utilized. Therefore, the freeboard height of the target ship is determined according to the freeboard weight distribution, automatic freeboard height detection is realized, and the freeboard height detection efficiency is improved while the measurement precision is ensured and the cost is controlled.

The invention relates to an image analysis and AI video technology-based ship lockage and ferry safety intelligent supervision system. The system comprises a front-end multi-mode sensing system, a rear-end intelligent processing system, an early warning reporting system and a data middle station interaction module. The front end acquires high-quality data through a plurality of groups of multi-angle high-definition industrial cameras and a self-adaptive pan-tilt camera; the rear end is supported by an algorithm library to realize ship identity recognition, draft detection, ferry trajectory tracking and abnormal behavior recognition; the early warning system reports abnormal information in a grading manner according to severity; the data intermediate station module realizes bidirectional data interaction; ship draft detection is obtained through image preprocessing, identity recognition and freeboard height conversion calculation, ferry trajectory deviation is achieved through target detection, trajectory generation and direction included angle judgment, and the method aims at solving the problems that in the prior art, the function is single, the environment adaptability is poor, and safety parameter detection and data interaction capacity is lacked.

The application discloses a kind of inland river ship freeboard measurement method based on monocular vision.First, the internal parameter calibration of monocular camera is carried out using checkerboard by Zhang Zhengyou calibration method, and the internal parameter of camera is obtained;The camera shoots the side view of the ship, and the Deeplabv3+ model is used to segment the part between the ship deck line and the waterline according to the side view of the ship;Further, the ship deck line and the waterline are detected to determine the position of the ship freeboard and calculate the pixel height of the ship freeboard;The conversion from pixel height to actual height is realized by the camera internal parameter obtained by calibration, and the real value of the ship freeboard is calculated.The application models the parameters of the camera itself, does not rely on vanishing point and vanishing line for ship freeboard measurement, and provides assistance for the safety navigation of inland river ships on water as the basis for ship overload detection.

The present application belongs to the technical field of ship draft detection, and provides a ship draft depth real-time detection system, which comprises: establishing a three-dimensional dynamic coordinate system, updating a water surface datum in combination with real-time water level data; calculating adjacent frame water level change and compensating point cloud Z-axis; separating pure ship body point cloud in combination with the water surface datum, ship body reflectivity and a region growing algorithm; fitting a deck plane of the pure ship body point cloud, extracting a ship side feature through edge detection, and correcting a side shell feature surface; converting the water surface datum into pixel coordinates and superimposing an auxiliary line; positioning a draft line, converting bow / midship / stern draft line coordinates to the three-dimensional dynamic coordinate system, and calculating initial draft depth; extracting average coordinates of the Z-axis of the deck, calculating the bow / midship / stern freeboard height in combination with the water surface datum coordinates; and calculating the theoretical draft depth in combination with the ship type depth deduction, comparing the initial draft depth, and outputting the final draft depth, so as to improve the ship draft depth detection precision in a complex water level change environment.

The invention belongs to the field of ship detection, and particularly relates to a non-dynamic draught detection system and method of a ship, the system comprises a base station, a tide level station, a plurality of mobile stations and an acquisition and control terminal, the base station is used for calculating an error value between a real-time observation coordinate and a known accurate coordinate; transmitting differential data including the error value to the mobile station; the tide level station is used for continuously monitoring real-time tide level data of the sea area where the ship is located. The mobile station is used for receiving the GNSS satellite signal and the differential data sent by the base station, and resolving to obtain a three-dimensional coordinate; measuring the offset of the mounting position of the mobile station and the vertical direction of the freeboard deck; and the acquisition and control terminal is used for receiving the three-dimensional coordinates and the offset in the vertical direction of each mobile station, calculating the barycentric coordinates of the freeboard deck by adopting a three-point barycentric algorithm according to the plane coordinates and the calibration elevation of the three mobile stations, obtaining the actual height of the water surface where the ship is located, and calculating the real-time draft of the ship. According to the draught detection system, efficient, convenient and accurate ship draught detection can be achieved.

The utility model discloses a rectangular culture net cage with a low freeboard, and relates to the technical field of culture equipment, the rectangular culture net cage comprises a base, a frame structure, an upper building structure and a second support column, the middle part of the base is hollowed out and is provided with a first netting; the frame structure comprises a plurality of first supporting columns and a plurality of connecting assemblies, the first supporting columns are arranged on the base, and the connecting assemblies are arranged between every two adjacent first supporting columns; a second netting is arranged on the outer side of the frame structure; the second supporting column is arranged on the base, and the height of the second supporting column is larger than that of the first supporting column; the upper-layer building structure is arranged at the top of the second supporting column; a walkway and an operation room are arranged in the upper-layer building structure, and breeding equipment is arranged in the operation room. The height of the second supporting column is higher than that of the first supporting column, so that the height of the second supporting column provided with the superstructure is higher so as to avoid impact of sea waves, the design height of the first supporting column serving as a freeboard is reduced, and steel consumption is reduced.

The design concerns a work or pleasure vessel capable of unobstructed passage through very shallow water passages, such as (but without exception) fixed bridges and the like. The upper part of the freeboard, the inflatable section, will collapse upon deflation of the air inside and rest upon the rigid part of the hull, thereby creating a very limited clearance height. This allows these obstacles in the waterway to be passed effortlessly and easily at all times. In both the inflated and deflated states, the inflatable part of the freeboard forms a permanently attached part of the vessel. After passing through the passage, the inflatable part of the freeboard is restored to its original shape using an air pump, after which the vessel safely navigates the waterway in its complete form.

A pleasure craft is provided such as a luxury pleasure craft. The craft eliminates the need for transverse bulkheads in one or more decks inside the hull of the craft, thus improving the aesthetics and usability thereof. The hull of the pleasure craft defines an imaginary or virtual freeboard deck located below the main deck of the craft. A cavity is arranged on one or more decks on both sides of the hull separate from the remaining space of the corresponding deck and delimited on its outer side by the corresponding side wall. The imaginary or virtual freeboard deck is therefore at a height equal to the extension in the vertical direction of the cavities from the floor of the corresponding deck.

This invention belongs to the field of boat and vessel deployment and recovery technology, and discloses a boat and vessel deployment and recovery device and a vessel. The boat and vessel deployment and recovery device comprises multiple ramp components that are rotatably connected in sequence, allowing the ramp structure to be placed on the vessel in a rolled-up state. When the boat needs to be retrieved or released, the ramp structure is unfolded by the deployment and recovery mechanism, placing the boat on the ramp structure. A lifting mechanism then moves the boat along the ramp structure, achieving the retrieval or release of the boat. After the boat has finished moving, the ramp structure returns to its rolled-up state and is stored on the vessel. This boat and vessel deployment and recovery device saves space on the vessel, expands the effective usable area of ​​the deck, and allows for the installation of different numbers of ramp components to adjust the length and slope of the ramp structure according to the vessel's freeboard. It has good practicality, is simple to design, and is safe and reliable.

The invention provides a method and a system for determining the size of a front edge area of a graded vertical wharf, and relates to the technical field of wharf front edge area size determination, comprising the following steps: acquiring the design high and low water levels of a port and the empty and full load freeboards of a target ship type; calculating the top elevations of the upper and lower platforms based on the obtained parameters; extracting operation equipment space occupation and process space requirements according to a preset loading and unloading process scheme to form a process requirement data set; taking the upper platform as a design plane, taking process demand data as a constraint, constructing a total width optimization function taking the width of each functional area as a variable and taking minimization of the total land occupation cost of a leading edge area as a target, and solving the design width of the upper platform; constructing a width constraint model by taking a lower platform as a design plane, and solving a minimum feasible width; a design parameter set is constructed according to the design elevation and width of the upper platform and the lower platform and serves as a deterministic basis of the wharf leading edge area size, and reliable technical support is provided for scientific and efficient design of the graded vertical wharf.

The invention discloses a dam turnover water depth calculation method for moraine lake surge, belongs to the technical field of disaster prevention and control, and can solve the problem that the dam turnover water depth cannot be accurately calculated in the prior art. The method comprises the steps that S1, a freeboard of the moraine lake is determined according to the water level height of the moraine lake and the dam crest height of a dam of the moraine lake; s2, determining the wave height and the wave velocity of the surge propagating to a preset position in front of the dam; s3, calculating a first ratio of the wave height to the freeboard, and calculating a second ratio of the kinetic energy of the wave velocity to the potential energy of the freeboard; and S4, the dam turning water depth of the surge is determined according to the first ratio, the second ratio and the freeboard. The method is used for calculating the dam turning water depth of moraine lake surges.

According to the oil cylinder arrangement structure of the roll-on-roll-off ship movable ramp, the movable ramp is located above a freeboard deck, a liquid tank and an air duct are arranged between the freeboard deck and the movable ramp, and the oil cylinder arrangement structure comprises an oil cylinder arrangement structure space defined by peripheral side structure longitudinal walls, the movable ramp and the freeboard deck. The air ducts and the liquid tanks are sequentially arranged on the two sides of the oil cylinder arrangement structure space from bottom to top, the structure longitudinal wall and the wall of each liquid tank are arranged in a spaced mode, and the oil cylinders are located in the oil cylinder arrangement structure space and connected with the freeboard deck through oil cylinder bases fixed to the freeboard deck. According to the oil cylinder arrangement structure of the roll-on-roll-off ship movable ramp, the requirements for liquid tank and air duct arrangement are met, and the requirements for oil cylinder supporting strength and oil cylinder maintenance are met.

A ship having a first hatch element covering an opening in the freeboard and a second hatch element covering an opening in an upper deck. To enable a more flexible cargo handling, the second hatch element protrudes sideways over the freeboard in its open position, and it can therefore be used as a crane for cargo handling.

The utility model relates to a high freeboard ship embedded type up-down step which comprises a stair embedded in a ship, the end, close to a ship shell, of the stair is lower than a deck, the other end of the stair is flush with the upper edge of the deck, and a springboard used for being in butt joint with a wharf is further arranged on the stair. The shape of the springboard is the same as the bending shape of the staircase, and the springboard is attached to the surface of the staircase. The stair is embedded in the ship, so that the stair does not directly collide with a wharf in the ship docking process, the stair is not prone to being damaged, and under the condition that the distance between the ship and the wharf is long, the springboard attached to the stair can be moved to the position between the lower end of the stair and the wharf; therefore, the elevator can be moved from the stairs to the wharf through the gangplank.

The utility model relates to the field of surface water environment, in particular to a novel microorganism sample sampling rod which comprises an electric telescopic rod, and a protective cover is mounted at the output end of the electric telescopic rod; one end of the threaded column is inserted into the threaded sleeve, the threaded column is in threaded connection with the inner wall of the threaded sleeve, the protective cover can be conveniently installed at the output end of the electric telescopic rod, and the sealing performance of the connecting position of the fixing piece and the threaded sleeve can be enhanced through the sealing gasket arranged outside the end, close to the fixing piece, of the threaded column in a sleeving mode; by rotating a fastening screw at the top of the protective cover, the abutting plate can be driven to move, so that the sterilization bottle can be conveniently abutted and fixed in the protective cover, by holding a handle at one end of an electric telescopic rod, the length of the electric telescopic rod can be conveniently controlled through an adjusting key, the sterilization bottle can be conveniently placed in water for sampling, and the problem that a ship body is high in freeboard and inconvenient to use is solved. And under the condition that the freeboard cannot be lowered by adjusting the draft, the bottle is difficult to be placed under the water surface by a hand for countercurrent sampling.

This invention provides a method and system for determining the dimensions of the frontal area of ​​a graded vertical wharf, relating to the technical field of wharf frontal area dimension determination. The method includes: obtaining the port's design high and low water levels and the empty and full-load freeboard of the target vessel type; calculating the top elevations of the upper and lower platforms based on the obtained parameters; extracting the space requirements for operating equipment and process space according to a preset loading and unloading process plan, forming a process requirement dataset; using the upper platform as the design plane and the process requirement data as constraints, constructing a total width optimization function with the width of each functional area as a variable and minimizing the total land occupation cost of the frontal area as the objective, to solve for the design width of the upper platform; using the lower platform as the design plane, constructing a width constraint model to solve for the minimum feasible width; and constructing a set of design parameters based on the design elevations and widths of the upper and lower platforms, serving as the basis for determining the dimensions of the wharf frontal area. This invention provides reliable technical support for the scientific and efficient design of graded vertical wharves.

A kind of unshielded container ship built-in B type cabin, container ship is provided with B type cabin, the B type cabin is continuously arranged along the length direction, the top of the B type cabin is outwardly convex, higher than the highest point of the hull topside structure;The bottom of the B type cabin is oblique at the hull bilge portion protruding structure, and is oblique;Stop floating and rocking member is arranged between the sidewall of the B type cabin and the topside structure, folding rainproof structure is fixed above the stop floating and rocking member, and a plurality of stop floating and rocking members and the folding rainproof structure are arranged at equal intervals along the circumference of the B type cabin.The B type cabin of the present application protrudes above the deck and is exposed outside the hull structure, which increases the loading capacity of the B type cabin by 2 times of the traditional scheme, improves the LNG loading rate, and also maximizes the utilization rate of the container ship's cargo capacity, simplifies the construction process, reduces the weight of the empty ship, and achieves higher economic benefits.

The invention relates to a further development of a proven RLS sea rescue device into a mobile sea rescue device for the recovery of helpless persons adrift in the water from a ship. The purpose of the invention is to enable helpless persons to be taken on board even with high sides without having to send a boat or an assistant into the water. The mobile sea rescue device has a propulsion system consisting of two ship propellers or water jet compressors, which are remotely controlled from the deck of the ship. To secure the helpless person above a lowered spreader frame and a horizontally stretched support net above it, vertical struts are arranged at the outer ends of the spreader frame, between which a semicircular vertical safety net is stretched, thus securing the person against drifting. To disconnect the crane hook from the load-bearing crane cable of the mobile life-saving device, a coupling adapter is remotely released from a coupling block that is hooked into the crane hook. After the secured person has been positioned under the crane hook, the coupling adapter is pulled into the coupling block from the deck using a safety line and automatically engages in the coupling block for hoisting the mobile life-saving device. Power is supplied either via power cables that run from a power source on deck and are attached to or integrated into the safety line, or by one or more rechargeable batteries integrated into the mobile life-saving device along with radio signal control.

The utility model relates to the technical field of water rescue, and discloses a foldable modularized wounded person auxiliary raft climbing device which is characterized in that a turnover climbing net, a fixing belt, a turnover belt, a spring buckle and an anti-sinking supporting plate are arranged, the anti-sinking supporting plate is located on the back of the turnover climbing net, and the turnover belt is arranged on the back of the turnover climbing net; in the process of rescuing people, the human body is unfolded, smooth overturning is facilitated, spring buckles at the top ends of the fixing belts are connected with a life raft (boat) and a fixing ring at the bottom of a small rescue boat, and then the overturning climbing net of the device is thrown into water to form a free drooping state to be tightly attached to the freeboard of the life raft (boat). Spring buckles at the top ends of the overturning belts are arranged on handrail ropes on the two sides of a freeboard of a life raft (boat) respectively, the overturning belts are prevented from falling into water during arrangement and use, the rescue efficiency is not affected, the device has the advantages of being small in size, light in weight, easy and convenient to install and use and the like, the device is suitable for being carried and used in various water rescue scenes, and the personnel rescue success rate is greatly increased.

The invention provides intelligent monitoring equipment for postures of floating-state pouring immersed tube joints. The intelligent monitoring equipment comprises a floating-state pouring tube joint space positioning system, a floating-state pouring tube joint dip angle monitoring system, a floating-state pouring tube joint freeboard monitoring system, a floating-state pouring tube joint mooring rope tension monitoring system, an external environment monitoring system and a basic data system. A monitoring object of the floating-state pouring immersed tube joint posture intelligent monitoring device is an unformed floating-state pouring tube joint. According to the method, the blank of the floating pouring immersed tube joint attitude monitoring technology is filled up, the azimuth angle of the tube joint is calculated by adopting the front GNSS and the rear GNSS, the monitoring of the length, the width, the height, the plane and the elevation position of the tube joint is combined, the precision can reach 2cm, and compared with a compass or azimuth angle monitoring device, the monitoring method disclosed by the invention is higher in precision; the method not only can be applied to attitude monitoring of floating pouring immersed tube joints, but also can be used for monitoring structures such as conventional immersed tube tunnel floating transportation and offshore floating bodies, and is wide in application scene.

The application discloses a kind of ship anti-piracy cabin emergency ventilation systems.The ship anti-piracy cabin emergency ventilation system includes the anti-piracy cabin under the topside deck, the side wall of anti-piracy cabin is provided with at least one air inlet pipe and one exhaust pipe in horizontal direction, air inlet pipe and exhaust pipe are close to topside deck, and air inlet pipe is at the opposite side of exhaust pipe, air inlet pipe and exhaust pipe extend to the outside of the hull from anti-piracy cabin respectively, the end of air inlet pipe extending into anti-piracy cabin is connected with extension pipe extending to the bottom wall of anti-piracy cabin, the upper side of extension pipe is provided with outside valve one, the lower side of extension pipe is provided with several air supply openings, the end of exhaust pipe extending into anti-piracy cabin is provided with outside valve two.The application solves the problem of high exposure risk and low safety in the prior art.

The utility model relates to the technical field of ship engineering, and discloses a lightering anti-collision device for a ship and the ship, the ship comprises a freeboard deck, the lightering anti-collision device for the ship comprises a first winching part, a second winching part and a third winching part, the first winching part is arranged on the freeboard deck, and the power output end of the first winching part is connected with a pull rope; the anti-collision piece is connected to one end of the pull rope; and the anti-falling part is connected with the freeboard deck and the anti-collision piece. The position of the anti-collision piece on the ship board is adjusted through the first winding part to achieve the anti-collision effect, dependence on sailors can be reduced, the operation efficiency is improved, the safety risk caused by non-standard operation is avoided, and the safety and reliability of lightering operation between ships are improved.

The invention discloses a ship freeboard height monitoring method based on vision and pressure sensing, and the method comprises the steps: continuously shooting one side of a ship body, synchronously recording the pressure of an underwater shipborne pressure sensor, processing a shot image, and extracting the pixel height g (t) from a near-side deck line to a water surface, the method comprises the steps that the pressure is converted into the draught at the same time, the change relation between the draught and the pixel height is observed, interfered arrays are filtered out, the actual height value d corresponding to the unit pixel height is obtained, g (t) is multiplied by d, the average value is obtained, and then the freeboard height is obtained, and the method is simple, low in monitoring cost and accurate in monitoring result.

The present application relates to a kind of for LNG ship freeboard mark measurement method, comprising selecting total station survey reference height;Selecting rib site, fill in the height measurement value and actual value of rib site, calculate average value;Practical clamp ruler measures the actual depth of freeboard mark installation position;The actual survey height of 30cm scale position to freeboard mark of 1m long steel ruler is calculated;Plate reference mark is made at the 30cm scale position of 1m long steel ruler, and survey height is measured downwards, obtains the drawing position of freeboard mark.A kind of for LNG ship freeboard mark measurement method of the present application, using special-purpose clamp ruler is inserted into the small gap between water curtain spraying device and plate rebate, the high-precision high-quality measurement of freeboard mark position is realized, and the method has wide universality.

The application discloses a method for wind power pipe pile sliding on a ship, which comprises the following steps: arranging a sliding tool at a wharf front, arranging a sliding tool on a transport ship, placing a pipe pile to be transported on a roller frame, calculating the center position of the pipe pile, confirming the pile length and the pile weight, and transporting the pipe pile to the wharf by two front and rear axis module vehicles; separating a single pile from the front axis module vehicle, driving the rear axis module vehicle to drive out from the side, lowering a lifting sliding device, driving the lifting sliding device to lift and move to a specified position together in the direction of a cab, untying a cable (raising an anchor) of the transport ship, and finally fixing the single pile according to requirements. The application can be applied to a tool for low tide, is not limited by a wharf and water depth of the wharf, can be used to smoothly and stably slide the wind power pipe pile on the ship at low tide, all kinds of tools used can be repeatedly used, and the use condition is not affected by tides and a height of a dry deck of a ship, so that the cost of loading on the ship is greatly reduced, and the loading time of the wind power pipe pile on the ship is shortened.

The application discloses a ship freeboard identification method based on a zoom camera and laser ranging, and comprises the following steps: installing a laser ranging module on a zoom camera holder, rotating the laser ranging module together with the zoom camera holder, and making the distance from the laser ranging module to a ship consistent with the distance from the zoom camera holder to the ship; calculating the edge value of an image containing a ship freeboard in a vertical direction by using a cumulative difference method, finding out two maximum wave crest values from all the edge values, and obtaining a ship water boundary line and a deck line and their respective line indexes in the image containing the ship freeboard according to the two maximum wave crest values; calculating the longitudinal distance between the ship water boundary line and the zoom camera holder according to a zoom camera holder and world coordinate system transformation model; measuring the distance between the laser ranging module and the ship water boundary line by using the laser ranging module, obtaining the longitudinal distance between the ship water boundary line and the zoom camera holder according to the Pythagorean theorem, and then obtaining zoom camera holder picture parameters, so as to obtain the ship freeboard height.