183 results about "Shallow sea" patented technology

The invention provides a method for quickly establishing a three-dimensional near-seafloor speed model in a shallow sea area; the method comprises the following steps of extracting initial informationand extracting a common-center-point gather; calculating the slope of the initial travel time in the common-center-point gather; judging whether a shot point is located in the seawater layer or not,and if yes, correcting the shot point to the seafloor; calculating the speed and the depth of inflection points corresponding to respective offset distances; performing linear interpolation on the speed at each depth to obtain a one-dimensional speed model of the common center point; after all the common-center point domain gathers are processed, adopting the linear interpolation method, calculating the speed values of the rest grid points by utilizing the one-dimensional speed model of all common center points, and a speed model is output. By adoption of the method for quickly establishing the three-dimensional near-seafloor speed model in the shallow sea area, the influence of the seawater layer on ray propagation is overcome, and the influence of multiple excitation receiving modes on an inversion result is eliminated, and the problem that the conventional method needs to carry out multi-ray tracing forward modeling is avoided.

The invention discloses a marine geological sediment sampling device and method, and belongs to the technical field of sampling equipment. The marine geological sediment sampling device comprises a bottom frame, wherein one side of the bottom frame is a containing box, and the other side of the bottom frame is an inserting rod; the power box is arranged in the containing box through a sliding sealing structure, and a power element is installed in the power box. A sampling pipe in transmission connection with the power element, a floating assembly installed on the power box and an air pipe in the power box are installed among the multiple insertion rods, when the pressure in the cavity reaches a set value of a pressure valve, the valve is opened, compressed air is sprayed to stress blades through the air pipe to drive a first sliding ring to rotate, a floating plate rotates synchronously, and auxiliary propulsive force is generated; the propelling direction is consistent with the sinking direction of the device, the function of accelerating sinking is achieved, seawater resistance is effectively resisted, meanwhile, in a shallow sea area or a deep sea area, the overall buoyancy of the device is changed by dynamically adjusting the inflation volume in the floating plate, and the device can be prevented from violently shaking or inclining due to too fast sinking.

The invention provides a random forest shallow sea sediment classification method based on multi-temporal remote sensing image fusion, and relates to the technical field of sediment information extraction. Comprising the following steps: 1, collecting and preprocessing multi-temporal image data to obtain remote sensing reflectivity; 2, the water depth of each single-time-phase image is inverted, and the optimal water depth is obtained; 3, calculating bottom reflectivity characteristics of blue and green wave bands based on the optimal remote sensing image; 4, respectively calculating topographic features and spectral features based on the optimal water depth and the optimal remote sensing image; and 5, in combination with the bottom reflectivity features, the topographic features and the spectral features, carrying out random forest feature optimization and classification model training, and generating a substrate classification result. On the basis, the method solves the problems that an existing remote sensing image substrate classification method is insufficient in feature consideration, noise in a single-time-phase image can cause low classification precision, and therefore negative effects can be generated on accurate acquisition of substrate information.

The invention discloses a shallow sea area water depth inversion method based on a satellite-borne laser radar, and particularly relates to the technical field of single-photon water depth information extraction. The denoising method comprises the following steps: S1, data preprocessing: reading data, carrying out visual presentation, dividing photons into offshore photons, sea surface photons and undersea photons, and intercepting an effective photon region; s2, coarse denoising: denoising the area intercepted in the step S1 by adopting a DBSCAN (Density Based Spatial Clustering of Applications with Noise) algorithm; s3, fine denoising: screening effective signals of sea surface photons by adopting a Gaussian fitting algorithm, removing sea photons, separating subsea photons from the sea surface photons, performing density analysis on the subsea photons, extracting a density peak point, and constructing a density trend curve of the subsea photons by adopting a cubic spline interpolation method, eliminating residual noise deviating from normal distribution according to the trend curve; and S4, performing water depth inversion: performing refraction correction on the subsea photons subjected to fine denoising, fusing the corrected subsea photons and the sea surface photons subjected to fine denoising, and generating a water depth distribution diagram of the shallow sea area.

The invention provides a shallow sea multiband substrate reflectivity remote sensing detection method and a shallow sea multiband substrate reflectivity remote sensing detection system. According to the method, four-band multispectral data and ICESat-2 laser sounding data are combined, a strategy of selecting feature points and iteratively searching optical parameters of a water body is adopted, and an index relationship between semi-analysis substrate reflectivity and spectral parameters is utilized to globally constrain a radiation transmission model; a quadratic polynomial model between the chlorophyll concentration of the feature points and the remote sensing reflectivity of the blue and green wave bands is constructed, and large-range rapid inversion of the optimal water attenuation coefficient is achieved; and further combining with a surface remote sensing reflectivity product to construct a climate state monthly average deepwater reflectivity data set, thereby realizing large-range efficient detection of optical shallow sea multiband substrate reflectivity without actually measured data support. According to the method, the application efficiency of the four-waveband multispectral data with the most abundant historical data is improved, the method is high in practicability, and the method has great significance in protection and management of shallow sea coral reef benthic ecology.

The invention discloses an active and passive fusion water depth inversion method based on adaptive spectrum weighting, and the method comprises the steps: carrying out the atmospheric correction of a multispectral satellite image, extracting a target region, and removing a land region and a deepwater region; the method comprises the following steps: acquiring a seawater point cloud of a satellite-borne photon counting laser radar in a target area, extracting sea surface and seabed information, and performing refractive index correction and tide correction to obtain a reference water depth; matching each pixel in the multispectral satellite image with a reference water depth, and dividing the multispectral satellite image into a reference pixel and a to-be-measured pixel; according to the spectral value of the multispectral satellite image, the Euclidean distance between each to-be-measured pixel and all reference pixels is calculated, and the reciprocal of the distance is used as the weight of each reference pixel; and introducing a weight-to-weighted least square method, and fitting a relationship from the spectral value to the water depth for each pixel to be measured to realize water depth inversion of the pixels to be measured. The method can effectively improve the active and passive fusion water depth inversion precision when the water depth distribution is uneven and the shallow sea area environment is complex.

The invention provides an auxiliary structure for beach and shallow sea ecological restoration and a restoration system construction method, and belongs to the technical field of water conservancy projects for beach and shallow sea ecological restoration. The auxiliary structure comprises a combined type permeable submerged dike structure, a natural wave dissipation combined pile body and an oyster cultivation net-shaped structure. The combined type permeable submerged dike structure comprises hexagonal hollow prisms and isosceles trapezoid hollow prisms, the two prisms are of a staggered and stacked structure, and a natural shelter is provided for small marine organisms. The natural wave dissipation combined pile bodies penetrate through the combined type permeable submerged dike structure through the upper holes and the lower holes of the prisms, and the combined type permeable submerged dike structure is effectively supported and fixed. The oyster cultivation net-shaped structure is fixed to the natural wave dissipation combined pile body, and the design of the net-shaped structure meets the filter feeding environment of oyster cultivation. The repairing system is correspondingly designed based on an auxiliary structure and a field environment. The structure is simple, raw materials are easy to obtain, the protection engineering and the oyster reef body are organically combined, ecological environmental protection is achieved, and follow-up manual treatment is not needed.

The utility model discloses a shallow sea seaweed planting platform and relates to the technical field of marine ecological restoration. Comprising a traction ship, an offshore platform, a mesh belt reel, a seed mesh belt, compression rollers, degradable nails and supporting rods. The traction ship is connected with the offshore platform and can drive the offshore platform to move; the mesh belt reel is fixedly mounted on the offshore platform, the seed mesh belt is wound on the mesh belt reel, and the degradable nails are used for fixing one end of the seed mesh belt on the seabed in a needle pricking manner; one end of each supporting rod is in hinged connection with the offshore platform through a fixed hinge point, so that the supporting rods can rotate around the corresponding hinge points, the supporting rods rotate in a plane, and the net belt reel and the rotating plane are coplanar; and a compression roller is arranged at the other end of the supporting rod and can rotate on the corresponding end point of the supporting rod. The planting efficiency is improved, manual operation is partially replaced, and the operation process is simplified.

The invention relates to the technical field of marine acoustics, in particular to a multi-criterion selection method for a complex marine environment sound field calculation model, which comprises the following steps: S1, acquiring environmental parameters of a target sea area; s2, judging whether the terrain is horizontally changed, whether the seabed sediment is horizontally changed and whether the sound velocity profile gradient is horizontally changed according to the environmental parameters, if the terrain is horizontally unchanged, the seabed sediment is horizontally unchanged and the sound velocity profile gradient is horizontally unchanged, judging that the sound field environment level is unchanged, otherwise, judging that the sound field environment level is changed; and S3, selecting a model according to whether the sound field environment level is changed or not, if the sound field environment level is unchanged, selecting a shallow sea smooth average sound field model or a deep sea generalized phase integral model WKBZ according to a sea depth threshold value, and if the sound field environment level is changed, selecting a parabolic equation model RAM or a ray model BELLHOP according to a terrain type and a frequency threshold value. Through a multi-criterion selection method, scientization and engineering of complex marine environment sound field calculation model selection can be realized.

The invention belongs to the technical field of offshore wind power. According to the TLP floating type draught fan for the shallow sea and the stabilization control method, a draught fan body is fixed to a steel tower, the steel tower is fixedly connected to a truss type tower barrel, the bottom of the truss type tower barrel is connected with a plurality of height-variable floating barrels, and adjustable tension keys are connected to the bottoms of the height-variable floating barrels; the height-variable buoy comprises an inner barrel and an outer barrel, the inner barrel is located in the outer sleeve, and the jacking mechanism is arranged at the bottom in the outer barrel to drive the inner barrel to move up and down; a damping bin is arranged in the inner cylinder, the outer side wall of the damping bin is connected with the inner side wall and the inner bottom wall of the inner cylinder through elastic pieces, and the damping bin is connected with a liquid supply device through a pipeline so as to increase liquid when the floating body exceeds a set angle; wherein the floating body is a combined body of a plurality of height-variable floating barrels; the overall load is reduced while the supporting strength is guaranteed, and the device adapts to the limited water depth working condition of the shallow sea.

The invention relates to the technical field of marine hydrographic survey, and discloses a shallow sea full-profile ocean current information acquisition method based on data fusion, which comprises the following steps of: performing bidirectional dual acoustic detection on a shipborne measuring unit and a bottom-supported measuring unit, and acquiring and comparing respective acoustic channel transfer functions; the ocean current effect is quantified by analyzing symmetry breaking of the transfer function, meanwhile, channel disturbance characteristics of the water body environment are recognized, then the disturbance characteristics serve as dynamic constraints to guide data fusion, and an accompanying confidence coefficient index is generated for fused ocean current information. According to the method, an analysis core is changed from a measurement result to an acoustic channel bearing information, self-consistency verification is carried out on the measurement process while the flow velocity is obtained by analyzing the symmetry of channel response, and real flow field change and environment disturbance artifacts are distinguished from the physical principle, so that a blind area of data confidence in the prior art is avoided, and the accuracy of flow velocity measurement is improved. Measurement and diagnosis are integrated.

An offshore hydrogen production platform hydrogen production equipment cooling system comprises a gas-liquid treater, a hydrogen purification device, a chilled water machine, a hydrogen compressor and a hydrogenation machine, an inlet of the gas-liquid treater is connected with an electrolytic bath, and an outlet of the gas-liquid treater is sequentially connected with a hydrogen passivation device, the hydrogen compressor, a buffer gas tank, the hydrogen compressor, a hydrogen storage tank and the hydrogenation machine. The hydrogen adding machine is communicated with the hydrogen-powered ship and provides hydrogen for the hydrogen-powered ship, and the refrigerating unit is connected with the hydrogen passivating device through a pipeline to form a circulating pipeline. Aiming at the characteristics of offshore and shallow sea areas and a fixed hydrogen production platform, when hydrogen production equipment is cooled, required fresh water is provided through cooling of the air cooling radiator arranged on the main deck of the platform, so that the situation that seawater with poor cleanliness in the offshore and shallow sea areas flows through a plate heat exchanger to cool the fresh water to be provided is avoided; the cooling efficiency is improved.

The invention discloses a reverberation suppression method and device for shallow sea distributed scene feature learning. The method comprises the following steps: obtaining a target platform tensor for each target platform; constructing a corresponding deep expansion network for each target platform tensor; for the deep expansion network of the current target platform tensor, after parameter initialization is carried out by using a spectrum method, obtaining the hyper-parameter of the current deep expansion network based on the high-order singular value decomposition training of self-supervised learning; performing low-rank sparse decomposition on the deep expansion network of the current target platform tensor and the deep expansion network of the adjacent target platform tensor by using the current deep expansion network hyper-parameter; a current deep expansion network hyper-parameter is used as an initial hyper-parameter, a hyper-parameter of a deep expansion network of a non-adjacent target platform tensor is obtained based on high-order singular value decomposition training of self-supervised learning, and then low-rank sparse decomposition is performed. The method can be applied to shallow sea distributed scenes and has high-precision reverberation suppression.

The utility model discloses a depth-adjustable seawater quality sampling device which comprises a submersible, a remote control module and a positioning module are arranged in the submersible, the depth-adjustable seawater quality sampling device further comprises a sampling mechanism, and the sampling mechanism is arranged on the submersible; according to the depth-adjustable seawater quality sampling device, through the first remote ball valve and the second remote ball valve, on-off of water flow can be accurately controlled, the water flow can be conveniently controlled at different stages, then the internal pressure of the sampling shell is controlled, and through cooperation with the one-way valve, water flow backflow can be prevented, and it is guaranteed that seawater flows in the preset direction; according to the invention, mixing of water samples at different depths is avoided, the sampling accuracy is ensured, the underwater propeller rotates to generate water flow, and the first one-way drainage valve is matched, so that the previously stored relatively shallow sea water can be drained to the outside, stratified sampling of sea water at different depths is facilitated, and the sampling accuracy is further improved.

The present application relates to a kind of shallow sea seabed node redirection method based on first arrival polarization characteristic constraint, medium and equipment, belong to geophysical exploration data processing technical field.The method includes the following steps: extracting common receiver gather from analog or field collected four-component seismic data, obtaining first arrival time and propagation azimuth, according to the energy distribution of first arrival time window, polarization characteristic and P, Z component correlation jointly constrained construction target function;Directional parameter solution and seabed node acquisition seismic data directional correction.In addition, the present application comprehensively utilizes the energy of first arrival wave, polarization characteristic and P, Z component correlation to carry out geophone redirection, can solve the application condition restriction, insufficient precision in the method of conventional only using direct wave to carry out redirection and the multi-solution problem existing in reflection wave energy method itself.

The present invention relates to a shallow-water oil and gas production control device and an installation method thereof, comprising: an oil and gas production control module, a sealing fixing plate and a seabed fixing plane; the oil and gas production control module is sealed and fixed on the sealing fixing plate, for monitoring the working condition of the entire control device; at least one positioning joint is provided on each of the two opposite sides of the sealing fixing plate, and the positioning joint is used in conjunction with a fixing pin provided on the seabed fixing plane, for fixing the sealing fixing plate on the seabed fixing plane; the positioning joint comprises a fixing portion and a guide portion, the fixing portion is perpendicular to the sealing fixing plate, and is a tubular structure with one end closed and the other end open, and the open end faces downward; the guide portion is provided at the open end of the fixing portion, for guiding the fixing pin to be inserted into the fixing portion, and the top of the guide portion is located below the bottom surface of the sealing fixing plate. It only requires a simple sealing and positioning design, and does not require a professional lowering platform and a professional underwater robot, thereby saving costs.

The utility model relates to the technical field of shallow sea cultivation, and discloses a shallow sea cage cleaning system which comprises a water tank, a pattern plate is fixedly connected to the middle of the inner wall of the water tank, first gears are rotationally connected to the front side and the rear side of the right end of the inner wall of the water tank, and the two first gears are meshed and connected; first rotating rods are fixedly connected to the left sides of the two first gears, second rotating rods are rotatably connected to the front side and the rear side of the left end of the inner wall of the water tank, first spraying pipes are fixedly connected to the sides, adjacent to the second rotating rods, of the first rotating rods, and the right ends of the first rotating rods penetrate through the water tank and are fixedly connected with second gears. According to the lifting cage cleaning device, the telescopic rod drives the toothed plate so as to drive the first spraying pipe to rotate around the lifting cage on the outer side of the lifting cage, the third transmission gear and the second spraying pipe rotate while the first spraying pipe rotates, the inner wall of the lifting cage is cleaned, and it can be guaranteed that all dead corners of the lifting cage can be cleaned up through impact of high-pressure water flow.

The invention discloses a density detection and intrusion early warning method for a shallow sea biological model, and the method comprises the following steps: 1, density detection: a system firstly analyzes an input image or video frame through a target detection module based on an improved YOLO algorithm, recognizes a shallow sea biological target in the image or video frame, determines the type of the shallow sea biological target, and carries out the early warning of the intrusion of the shallow sea biological target; the shallow sea biological density detection is realized by combining an image processing method; step 2, acquisition of a shallow sea organism population coefficient: according to the detected shallow sea organism category, acquiring a corresponding population coefficient which reflects contribution of different types of shallow sea organisms to intrusion intensity; the method has the beneficial effects that the shallow sea organism data set is self-made, the content of the data set is enriched through an image enhancement technology and a data enhancement means, the diversity of samples is increased, and the recognition capability and generalization performance of the model on different types of shallow sea organisms are improved, so that the model can adapt to a complex underwater environment and a variable target form.

The invention discloses a compact and easily-controlled shallow sea buoy hydraulic system and a working method thereof. The system comprises a telescopic rod, a piston, an inner oil tank, a first one-way valve, a second one-way valve, a gear pump motor set, a normally-closed two-position two-way reversing valve and an outer oil bag. The piston is arranged in the inner oil tank, connected with the telescopic end of the telescopic rod and driven by the telescopic rod to do linear motion in the inner oil tank. The inner oil tank is provided with two oil ports, one oil port is connected to the outer oil bag through a first one-way valve, and the other oil port is connected with an oil outlet of the gear pump motor set through a second one-way valve. An oil inlet of the gear pump motor set is connected with one port of the normally-closed two-position two-way electromagnetic directional valve, and the other port of the normally-closed two-position two-way electromagnetic directional valve is connected with the outer oil bag. The system is compact in structure, only one electromagnetic directional valve and two one-way valves are used in use of the valves, and the number of elements and the size of the system are remarkably reduced.

The invention discloses a sea cucumber accurate fishing robot suitable for a shallow sea culture area, and relates to the technical field of aquaculture equipment.The sea cucumber accurate fishing robot comprises a rack, an equipment cabin, a collecting cabin, a power supply cabin and a plurality of propellers are installed on the rack, and a fishing mechanical arm matched with the collecting cabin is installed on the front side of the rack; a precise fishing framework is arranged in the equipment cabin, the precise fishing framework identifies the positions of sea cucumbers in the shallow sea culture area and controls the fishing mechanical arm to fish the sea cucumbers and then put the sea cucumbers into the collecting cabin, and a power supply unit is arranged in the power supply cabin to supply power to the precise fishing framework and the fishing mechanical arm. Through fusion perception, turbid water body image enhancement and accurate positioning, full-process autonomous accurate fishing of the sea cucumbers in the shallow sea high-turbidity environment is achieved, manual diving operation is replaced, the fishing efficiency and the product quality are greatly improved, and intelligent upgrading of the sea cucumber culture industry is promoted.

The application discloses a fish tail type tidal current energy power generation device, which solves the problem that the existing tidal current energy power generation device cannot be effectively applied to the near-shore shallow sea area, has the advantages of large sweeping area and high power generation efficiency, and has the technical scheme that the device comprises a first swing energy absorbing mechanism and a second swing energy absorbing mechanism; the first swing energy absorbing mechanism comprises a first cross arm, the end of the first cross arm is hinged to a first hydrofoil, and the first cross arm is connected with a first hydraulic pump and a first air pump; the second swing energy absorbing mechanism comprises a second cross arm, the end of the second cross arm is hinged to a second hydrofoil, and the second cross arm is connected with a second hydraulic pump and a second air pump; the first hydraulic pump is connected with a second hydraulic motor, the second hydraulic motor is connected with the second hydrofoil, and the second hydraulic motor drives the second hydrofoil to swing along the hinged position of the second cross arm; the second hydraulic pump is connected with a first hydraulic motor, the first hydraulic motor is connected with the first hydrofoil, and the first hydraulic motor drives the first hydrofoil to swing along the hinged position of the first cross arm.

The utility model relates to the technical field of ocean seawater detectors, and discloses a fixed seawater detector for a shallow sea area, which comprises a main body and a floating ball connected to the outer wall of the main body, and the bottom end of the main body is provided with a protective dismounting mechanism and an auxiliary filtering mechanism. The handle is pulled upwards to drive the positioning column to move and break away from the inner wall of the clamping positioning hole, clamping block limiting is relieved, then the connecting frame is rotated to drive the clamping block to move to the opening of the inserting groove, and then the connecting frame is pulled downwards to drive the outer wall of the clamping block to break away from the inner wall of the inserting groove, so that disassembly is completed. During mounting, the steps are reversely operated, so that the outer walls of the clamping blocks move relative to the positioning columns until clamping holes in the top ends of the clamping blocks move to the positions below the positioning columns, the clamping columns can be clamped to the inner walls of the positioning holes through springback of springs, and mounting is completed; the detector is prevented from colliding with coral reefs when the detector moves downwards along with sea waves to cause damage and influence on subsequent detection data.

The invention discloses a spherical dual-mode ocean energy collector, which adopts a transparent spherical shell structure to integrate a flexible amorphous silicon photoelectric assembly and a PZT piezoelectric assembly, and realizes light-vibration dual-mode energy collection and efficient management through an H-PSSHI circuit. The device has a dynamic self-balancing structure, is suitable for a shallow sea low-energy environment, can be seamlessly integrated on offshore facilities such as an anti-shark net buoy and the like, and realizes a self-energy-supply warning function. The design of light weight and high compatibility significantly reduces the deployment and maintenance cost, and provides an innovative solution for the integration of offshore renewable energy and safety early warning.

The invention provides a monitoring system and method for identifying sea surface oil spill by using a polarization state of light, and belongs to the technical field of beach shallow sea oil spill monitoring, and the system comprises a polarization data acquisition module which is used for acquiring polarization image data of a sea surface oil spill monitoring area; the data transmission module is used for transmitting the polarization image data of the sea surface oil spill monitoring area acquired by the polarization data acquisition module to the polarization data processing module; the polarization data processing module is used for analyzing and processing the received polarization image data of the sea surface oil spill monitoring area acquired by the polarization data acquisition module, carrying out primary identification on sea surface oil spill according to an analysis and processing result, and sending alarm information if the sea surface oil spill is identified to exist; and the control module is used for controlling operation and data processing of the monitoring system. According to the monitoring system and method for identifying the sea surface oil spill, the sea surface oil spill in the beach and shallow sea area is monitored based on the polarization state of light, and the oil spill identification capability can be remarkably improved.

The utility model provides a submarine cable protection device suitable for shallow sea, which comprises a plurality of protection modules sequentially arranged on a submarine cable along the extension direction of the submarine cable, and each protection module comprises a fixing unit, a buoyancy unit and a counterweight unit; the fixing unit is connected with a submarine cable; the buoyancy unit is connected to one end of the fixing unit close to the sea surface and used for driving the submarine cable to break away from the seabed; the counterweight unit is connected to the end, close to the seabed, of the fixing unit and used for preventing the submarine cable from displacing under the impact of sea waves. According to the utility model, the buoyancy unit is designed to drive the submarine cable to be separated from the seabed, so that friction generated by direct contact between the submarine cable and the seabed is effectively avoided, and the risk of damage to the submarine cable due to friction is greatly reduced. The buoyancy unit not only provides necessary buoyancy, but also ensures the stable suspension state of the submarine cable underwater, and prolongs the service life of the submarine cable.

The invention discloses a model airplane free floating release device suitable for a shallow sea environment and a release method thereof, and the method comprises the steps: enabling a model airplane and a test bench to be aligned at a preset position, and guaranteeing the horizontal state of the model airplane and the test bench; controlling the water volume of a water ballast space of the model airplane so as to realize the required initial trim angle and positive buoyancy; the model airplane is placed on the sea surface or below the water surface, and a release control device is started, so that the model airplane is in a free floating state; after the posture of the model airplane is stable, a water pump is started, and water is injected into the water ballast space; and pulling a traction chain of the release control device to enable the model airplane and the test bench to be in self-locking connection again. According to the method, the reliability can be improved, the operation process is simplified, the adaptability is enhanced, the safety is improved, the cost is reduced, and the test efficiency is improved.

The invention provides a shallow sea underwater terrain inversion method and system based on a video SAR, and belongs to the synthetic aperture radar signal processing field and the ocean remote sensing application field, and the method comprises the steps: obtaining multi-frame SAR data with sea wave characteristics in a shallow sea area based on the video SAR; registering the obtained multi-frame SAR data with characteristics in the shallow sea area to obtain a video SAR image; every two frames of video SAR images are uniformly divided into sub-image blocks in an overlapped mode, and the wave lengths and the wave velocities of the sub-image blocks are estimated respectively; inverting water depths corresponding to all the sub-image blocks by using a linear dispersion relationship to obtain multiple groups of underwater terrain inversion results; and fusing multiple groups of underwater topography inversion results, and taking the result as a final underwater topography detection result of the research area. According to the invention, more refined water depth inversion can be realized.

The invention discloses a shallow sea oil seismic exploration seabed node instrument deploying and retracting device and method, and the device comprises a pedestal, the upper end of the pedestal is provided with a fixed wheel assembly, and the upper end of the fixed wheel assembly is provided with an opening and closing wheel assembly; the number of the opening and closing wheel assemblies is consistent with that of the fixed wheel assemblies, and rolling assemblies are arranged in the opening and closing wheel assemblies and the fixed wheel assemblies. And the rolling assembly comprises a driving assembly and a tire which are connected in sequence. Mechanization of retracting and releasing of the seabed node instrument is achieved; on the premise of ensuring the safety, the ship can well control the retracting and releasing force and speed within a certain speed range when traveling, so that the arrangement, arrangement and recovery efficiency of shallow sea seismic exploration is improved, and the efficient, high-quality and safe operation of a seabed node instrument petroleum seismic exploration project is ensured.

The invention discloses an airborne ocean laser radar hierarchy and water bottom synchronous three-dimensional reconstruction method. The method comprises the steps of obtaining a three-dimensional point cloud of laser on a water surface according to airborne laser radar data; gridding is carried out on the three-dimensional point cloud of the laser on the water surface, multi-pulse averaging of spatial aggregation is carried out, and signals after gridding aggregation are obtained; and obtaining a water surface peak position, a level peak position and a water bottom peak position, and finally obtaining water bottom and level three-dimensional point clouds at the same time, thereby realizing high-precision three-dimensional reconstruction. According to the method, the thought of voxelized grids is combined, resolution sacrifice caused by multi-pulse averaging in a large space range is avoided, high-resolution three-dimensional reconstruction with adjustable resolution is achieved, a multi-target distinguishing algorithm architecture is designed, and the effect of multi-target simultaneous detection is achieved; the method has reference significance for shallow sea environment detection and shallow sea carbon cycle analysis, and has wide applicability.

This invention relates to the field of underwater acoustic signal processing technology, and discloses a method for calculating the transmission time of multipath underwater acoustic signals based on a Markov model. The method includes: first, performing bandgap conditioning and correlation processing on the received underwater signal to extract the energy envelope, and mapping it to a likelihood distribution in the time delay domain to obtain multipath structure observation parameters; then, calculating the tidal period phase factor based on the signal acquisition time, and establishing a multipath state evolution model modulated by this phase factor; next, using the multipath structure observation parameters to drive the model for time-series recursion, calculating the confidence sequence of the first-arrival multipath cluster's belonging state; finally, using the confidence sequence as weights, performing a fusion estimation of the preset propagation delay corresponding to each state, and outputting a continuous transmission time. This invention can effectively suppress jump errors caused by the time-varying multipath structure due to internal tides, and significantly improve the stability and accuracy of transmission time calculation in complex shallow sea environments.