13 results about "Echo sounding" patented technology

The invention relates to a pressure sensing inverse echo measurement LSTM short-time sea wave significant wave height prediction method, and belongs to the technical field of marine environment parameter inversion and marine dynamics observation. The method comprises the following steps: firstly, preprocessing multi-source observation data, and matching and integrating data from different sources; establishing a model, and improving the performance of the model by adjusting the structure and parameters of the model; and finally, evaluating the precision of the model, and verifying the precision and stability of the model in a complex environment. According to the method provided by the invention, a plurality of long and short-term memory network layers are combined with a plurality of full-connection layers to realize hierarchical fusion of time features, so that the prediction precision of the significant wave height of the short-term sea wave is improved, and important data support is provided for the directions of ocean dynamics, environmental evaluation and the like.

Described are systems and techniques for processing airborne lidar bathymetry (ALB) data. A plurality of lidar frames can be obtained, each associated with a respective measurement swath within a surveyed area and a first coordinate system corresponding to an ALB system. A plurality of multibeam echo sounder (MBES) bathymetry data points can be obtained, indicative of seabed locations within the surveyed area, and associated with a second coordinate system corresponding to the surveyed area. A subset of corresponding MBES data points can be determined for the respective measurement swath of each lidar frame based on projection between the first and second coordinate systems, and can be used to generate annotation information indicative of seabed locations within each lidar frame. A machine learning network can be trained to identify seabed bathymetry features within input lidar frames, using training data comprising the plurality of lidar frames and the generated annotation information. Unlocking insights from Geo-Data, the present invention further relates to improvements in sustainability and environmental developments: together we create a safe and liveable world.

The invention discloses an ice sailing ship. The present invention relates to a ship for sailing in an ice region, comprising: a skeg formed at the lower part of a stern; and the echo depth finder is arranged on the skeg and is configured to emit ultrasonic pulses to the seabed, receive the ultrasonic pulses reflected back from the seabed and calculate the depth of the seabed based on the time required for returning the ultrasonic pulses.

The application discloses a pressure type wave measuring instrument metering calibration device and method, relates to the technical field of hydrological measuring instrument calibration, and comprises the following steps: a wave simulation device drives a lifting platform to make periodic lifting movement according to a set wave height and a wave period, wave height measurement values of the pressure type wave measuring instrument and water depth measurement values of an echo sounder are collected; the water depth measurement values are converted into water depth standard values according to a correction value fitting function of the echo sounder; wave height standard values are calculated from the water depth standard values of each period, and an arithmetic average value is obtained as a standard wave height; the wave height measurement values are subjected to arithmetic averaging, and the difference between the arithmetic average value and the standard wave height is a wave height indication error. The lifting platform is driven to move again, a time interval corresponding to adjacent wave crests or troughs collected by the pressure type wave measuring instrument is taken as a wave period measurement value, a time interval corresponding to adjacent movement turning points of the lifting platform is taken as a wave period standard value, arithmetic average values are respectively obtained, and a difference value is taken as a wave period indication error.

The invention provides a fish counting method in an industrial aquaculture scene. The method comprises the following steps: carrying out conversion processing on input data; according to the diameter of the factory culture pond, sound ray data corresponding to the fixed pond wall needing to be removed are calculated; performing distance compensation on the echo sound ray data without the pool wall according to a distance compensation formula; environmental noise is removed according to fish echo characteristics; taking the average value of the current sound ray data as a threshold value, and performing vertex search on the part exceeding the threshold value; according to the average length and width of the fingerlings, the repeatedly counted fingerlings are removed; and according to the scanning range of the upper computer, performing fish quantity evaluation on the data of each frame. According to the invention, the method achieves the precise counting of fishes in a fixed factory scene through the analysis of the factory culture scene, reduces the labor cost, improves the statistical efficiency, and meets the demands of the continuously increasing underwater biomass statistics of the factory culture scene.

The invention relates to the field of underwater detection, in particular to an online siltation monitoring device with an anti-impact structure and an error elimination method thereof.The online siltation monitoring device comprises a detection cylinder, a sensor probe is slidably connected into the detection cylinder, the sensor probe comprises an electronic level meter and an echo depth finder, and a cable is fixedly connected to the top of the sensor probe; a compensator is slidably connected in the detection cylinder, a telescopic rod for driving the compensator to slide is arranged in the detection cylinder, and the compensator is located on the side, close to the bottom of the detection cylinder, of the sensor probe; the compensator comprises a base, one side of the base is rotationally connected with a rotating rod, the base is provided with a first driving piece for driving the rotating rod to rotate, the end, away from the base, of the rotating rod is provided with a frame body, a propeller is arranged in the frame body, and a second driving piece for driving the propeller to rotate is arranged in the frame body. According to the technical scheme, the direction-changeable propeller is arranged at the bottom of the detection cylinder, deformation caused by water flow impact is resisted, and the interior of the detection cylinder is cleaned through water flow.

The invention relates to an offshore wind power foundation scouring protection method and system, and belongs to the technical field of offshore wind power protection. The method comprises the following steps: through a multi-beam depth sounding sonar array and a vibration sensor array, obtaining a seabed elevation field and a pile body vibration response frequency around the offshore wind power single pile foundation in real time; the scouring depth and the scouring expansion rate are calculated based on a seabed elevation field, and the pile foundation residual bearing capacity is obtained through a structural dynamic inversion model in combination with pile body vibration response frequency changes; then, a two-parameter risk judgment criterion is constructed according to the scouring depth and the residual bearing capacity, and three-level scouring risk levels of a stable state, a development state and a dangerous state are divided; then, an adaptive protection strategy is executed according to the risk level, conventional monitoring is maintained in a stable state, a flexible turbulent flow unit is put in a development state, and targeted grouting is implemented in a dangerous state; and finally verifying the protection effect, upgrading the protection level if the protection effect is invalid, and continuously and circularly monitoring if the protection effect is valid. The precision and efficiency of scouring protection can be improved.

This invention relates to a method for measuring the acoustic absorption coefficient of the shallow seabed, comprising the following steps: measuring the seawater depth of the experimental sea area using an echo sounder; measuring the average sound energy density generated by rainfall using a hydrophone vertical array; measuring the rainfall intensity using a rain gauge; measuring the sound power radiated underwater by rainfall per unit area of ​​the sea surface; and calculating the acoustic absorption coefficient of the shallow seabed. The measurement method of this invention has a clear principle, and by measuring the underwater noise generated by rainfall, it can cleverly measure the acoustic absorption coefficient of the shallow seabed across the entire frequency band.

This invention discloses a multi-echo detection method for a multi-beam echo sounding system with combined amplitude and phase features. The pre-detection step includes: segmenting the beam output signal; for each unit to be detected, obtaining an amplitude detection threshold using the unit average constant false alarm rate (CFAR) method based on background noise estimation from the reference units on the left and right sides; extracting the instantaneous phase from the signals of each receiving channel using Hilbert transform, and obtaining the phase coherence factor between each receiving channel from statistical characteristics; dynamically adjusting the amplitude detection threshold as an adaptive weight to construct a detection threshold for combined amplitude and phase features; initializing weighting coefficients based on echo intensity differences, and dynamically optimizing them in conjunction with the intensity value of the phase coherence factor to obtain an adaptive weighted amplitude and phase joint detection threshold; merging sampling points exceeding the adaptive weighted amplitude and phase joint detection threshold, removing interfering targets, and identifying and extracting multiple independent effective target intervals.

A polar ship is disclosed. The polar ship includes: a plough formed at a lower portion of a bow of the ship; and the echo depth finder is arranged on the plough and is configured to emit ultrasonic pulses to the seabed, receive the ultrasonic pulses reflected back from the seabed and calculate the depth of the seabed based on the time required for returning the ultrasonic pulses.

The application discloses a kind of thin-wall steel cofferdam construction measurement control methods on underwater inclined bank slope, and the application is guided steel cofferdam section processing, in-situ assembly, overall lowering, etc., by steel cofferdam construction measurement control method.This application includes steel cofferdam processing acceptance based on line orientation method, in-situ assembly measurement based on ranging method, riverbed scanning based on echo sounding principle, magnetic adsorption prism is used to lay deformation monitoring point, and the three-dimensional posture and deformation of steel cofferdam during lowering process are observed, which guides steel cofferdam heightening and sinking construction, and ensures the smooth construction of thin-wall steel cofferdam on inclined bank slope.The application has the advantages of completing steel cofferdam processing and manufacturing, on-site assembly, full-process observation during lowering and heightening, ensuring smooth steel cofferdam construction, structural safety and accurate position, effectively solving the problem that the perpendicularity of steel cofferdam cannot be directly observed in the method of platform first and steel cofferdam construction.

A polar vessel is disclosed. The polar vessel includes: a keel protruding from the lower part of the vessel; and an echo sounder mounted on the keel, configured to transmit ultrasonic pulses toward the seabed, receive ultrasonic pulses reflected back from the seabed, and calculate the depth of the seabed based on the time required for the ultrasonic pulses to return.

Described are systems and techniques for processing airborne lidar bathymetry (ALB) data. A plurality of lidar frames can be obtained, each associated with a respective measurement swath within a surveyed area and a first coordinate system corresponding to an ALB system. A plurality of multibeam echo sounder (MBES) bathymetry data points can be obtained, indicative of seabed locations within the surveyed area, and associated with a second coordinate system corresponding to the surveyed area. A subset of corresponding MBES data points can be determined for the respective measurement swath of each lidar frame based on projection between the first and second coordinate systems, and can be used to generate annotation information indicative of seabed locations within each lidar frame. A machine learning network can be trained to identify seabed bathymetry features within input lidar frames, using training data comprising the plurality of lidar frames and the generated annotation information.