31 results about "Acoustical oceanography" patented technology

The invention discloses a marine acoustic real-time observation buoy system. The buoy system comprises a watertight housing, a stream guiding cover, a micro-weather station and a big dipper antenna arranged on the outer surface of the top of the watertight housing, a big dipper communication module arranged inside the watertight housing, a controller, a data collector, a hydrophone arranged insidethe stream guiding cover, wherein the hydrophone is connected with the data collector, the data collector is connected with the controller, the controller is separately connected with the micro-weather station and the big dipper communication module, and the big dipper communication module is connected with the big dipper antenna. The buoy system provided by the invention can synchronously detectreal-time marine environment noise and air-sea interface meteorological parameters at a position where the buoy is located, and can accurately invert the sea state at a specific position in a measured sea area using the marine environment noise and the meteorological parameters.

The invention belongs to the technical field of marine acoustics application of three-dimensional temperature-salinity-depth data, and particularly relates to a high-resolution sound velocity profile data compression method based on empirical orthogonal function decomposition. The method specifically comprises the following steps of providing data by using a high-resolution marine reanalysis product, and converting by using a sound velocity formula to obtain the seawater sound velocity profile data; according to the characteristics of the technical field of marine acoustics application, extending the high-resolution and long-time sequence sound velocity profile data under a certain space-time dimension to a seabed sedimentary layer; using a feature vector of a main mode as a primary function of the sound velocity profile empirical orthogonal function decomposition, and compressing and expressing the high-resolution and long-time sequence sound velocity profile information under the certain space-time dimension. According to the invention, the technical scheme of obtaining sound velocity profile data compression from a high-resolution ocean reanalysis product is realized; the effective compression of the sound velocity profile data under the certain time-space dimension is realized, and the beneficial effect that the compression rate of the high resolution and long-time sequence sound velocity profile data is more than 90%, is obtained.

An underwater navigation algorithm (UNA) uses acoustic signals transmitted in the ocean from sources at known positions to compute a position underwater for a vehicle that requires no initial a priori position or any ocean sound speed information or any initial GPS position that would require surfacing. The UNA consists of two parts, (1) the Cold Start Algorithm (CSA) and (2) the CSA with Modeling (CSAM). The underwater vehicle needs to be equipped with only a single hydrophone acoustic receiver and an onboard processor. The CSA requires only measuring the travel time of the end of the arrival coda (EOC) from each of the sources to compute a position. The CSAM is a post CSA procedure to calculate a higher accuracy position using the CSA position. CSAM utilizes the CSA position and a 4D sound speed field derived from an ocean 4D General Circulation Model (GCM) constrained using Ocean Acoustic Tomography (OAT) in the ocean area of operation and further includes (1) computing a modeled result with an acoustic propagation modeling code that is compared with the received acoustic data using a known procedure called “bulk shifting” and/or (2) a new proposed procedure that uses calculated group speeds from the 4D sound speed field, to provide a higher accuracy estimate of the receiver position.

The invention discloses a networking suspended marine environment acoustic characteristic measuring device and a method thereof. The device comprises a solar power generation device, a steering wheelset, a cable wheel, a speed reducer, a servo motor, an integrated cable, a temperature sensor, a salinity sensor, an anchor block, a vector hydrophone, a pressure sensor, a floating body tank, a storage battery, a controller, a data processing module, a Beidou communication module, an air bag, a balance adjusting assembly and an antenna. The output end of the servo motor is connected with the speed reducer; a cable wheel is arranged at the output end of the speed reducer, one end of the integrated cable is connected with the data processing module and enters seawater through the cable wheel and the steering wheel set, the anchor block is arranged at the tail end of the integrated cable, the temperature sensor, the salinity sensor, the vector hydrophone and the pressure sensor are arrangedon the integrated cable, and data collected by the sensors are processed and then sent to the controller. After networking, various detailed marine acoustic characteristics of a large-area sea area can be measured.

The invention belongs to the technical field of marine acoustic instruments and equipment, and particularly relates to a cabled underwater acoustic launching subsurface buoy which comprises shore equipment, a submarine cable (6) and underwater equipment. The shore equipment and the underwater equipment are connected through the submarine cable (6); the submarine buoy has a high-power punctual transmitting function of various acoustic signals, can work continuously for a long time around the clock, overcomes the defect that an existing transmitting submarine buoy is limited by severe weather and energy supply, can provide powerful support for marine acoustic technology research, and has very important significance in developing research on underwater acoustic physics, communication navigation, marine environment and the like.

The invention discloses a method for determining the underwater three-dimensional acoustic three-dimensional array of a wave glider, and relates to a method for determining the underwater three-dimensional acoustic three-dimensional array. The objective of the invention is to solve the problems of large size, large manpower/material resource consumption, fixed observation place and the like of anexisting marine acoustic information acquisition system. According to the process of the method, the underwater three-dimensional acoustic three-dimensional array is composed of a hydrophone three-dimensional array, an underwater towed body, wing plates and an attitude sensor; the hydrophone three-dimensional array is composed of six hydrophones, every two hydrophones form a group, and the three groups of hydrophones are installed in the X direction, Y direction and Z direction of the underwater towed body respectively; six wing plates are installed on the underwater towed body; the hydrophones are installed at the ends of the wing plates respectively; the attitude sensor is installed in the underwater towed body to obtain the magnetic heading of the underwater three-dimensional acoustic three-dimensional array; the real azimuth angles and pitch angles of different acoustic signals in the ocean relative to the underwater three-dimensional acoustic three-dimensional array are estimated.The method of the invention is applied to the field of marine environment detection equipment.

The invention belongs to the technical field of ocean survey and underwater acoustic engineering, and discloses a practical method, system, equipment and terminal for overall space-time planning of ocean acoustic survey. Selecting a survey station in the survey sea area; taking the station as a center radiation survey line; measuring point distribution and survey content on the measuring line are determined; planning a survey voyage number; selecting a long-term fixed-point standing position; and planning survey content, a data return mode and station service life. The marine acoustic survey space-time planning method provided by the invention can provide a simple and effective method and basis for task planning and scheme formulation of marine acoustic survey, and fills the blank in related aspects. Compared with a traditional space-time sampling method which directly replaces a surface with points or is uniform and high in density, the planning method provided by the invention can guide marine acoustics survey actions to obtain survey object space-time sampling with more reasonable density and establish more reliable and comprehensive marine acoustics characteristic cognition at a lower cost-efficiency ratio, thereby better serving underwater acoustic engineering application.

The invention relates to an Argo buoy and a marine acoustics and environmental parameter collaborative observation method based on the Argo buoy, and belongs to the technical field of marine observation. The Argo buoy comprises a hydraulic energy accumulator, an acoustic receiver and an acoustic transmitter. In the invention, the Argo buoys are integrated with the hydraulic energy accumulator and the acoustic transducer, the water depth position can be controlled by adjusting the buoyancy of the Argo buoys, and when two or more Argo buoys hover at different positions, the acoustic transducers carried by the Argo buoys are utilized to carry out mutual underwater acoustic signal transmission, so that acoustic measurement of the water depth positions of different ocean profiles is realized; according to the method, the motion trails of the Argo buoys in the marine environment parameter spring layer area are planned by utilizing the first probing and following action processes of the two Argo buoys, and refined observation in the marine environment parameter spring layer area is realized, so that the data measurement quality and the comprehensive measurement capability of the Argo buoys are improved.

The invention discloses a ZYNQ-based forward-looking sonar signal processing hardware system and relates to the technical field of marine acoustic equipment. The system comprises a ZYNQ module, a Spartan-6 module, a high-speed AD module, an analog front-end module, a power supply module, a DDR3 module, a gigabit network module, a PWM module, a DA module, an SD card module and a serial port communication module. The system is good in anti-interference capability, low in power consumption and good in real-time performance. The ZYNQ-based forward-looking sonar signal processing hardware system provided by the invention has the advantages of synchronous acquisition of multiple analog channels, high-speed processing of a large amount of data and high imaging speed.

The invention belongs to the technical field of marine acoustics, and relates to an underwater moving target closest approach distance estimation method. The method comprises the following steps: estimating azimuth angles of a target at three equal-interval moments by utilizing sound field information received by a single-vector hydrophone, and obtaining an estimated value of a target course angleaccording to the estimated azimuth angles; estimating the radial velocity of the target by using a synthetic aperture beam forming method according to the horizontal wave number spectrum characteristics; and according to the estimated values of the target azimuth angle, the heading angle and the radial speed, calculating the target closest approach distance by utilizing a geometric equation. According to the method, the problem that the distance of the underwater moving target cannot be estimated through a single-vector hydrophone in the prior art is solved. When the course angle is estimated, equal-time-interval azimuth sampling and geometric calculation are adopted, and the process is rigorous. Horizontal wave number spectrum characteristics are adopted, a synthetic aperture beam forming method is used for estimating the radial speed of a target, and a strict theoretical basis is provided. The closest approach distance is calculated according to the geometrical relationship, and theobtained result is accurate.

The invention relates to the technical field of marine acoustics and particularly relates to a forward acoustic scattering Doppler frequency shift calculation method for a moving target in water. The invention relates to a forward sound scattering Doppler frequency shift calculation method for an irregular track water moving target. The method comprises the following steps of (1) converting earth latitude and longitude coordinates of a transmitting end, a target track and a receiving end into rectangular coordinates, and sequentially marking the rectangular coordinates as (xS, yS), (xT, yT) and (xR, yR); (2) recording the coordinate sequence of the target track as (xT (ti), yT (ti)), i = 1, 2,..., N, and calculating the average navigational speed in all time periods; (3) smoothing the target track to obtain a virtual linear track, and respectively calculating the horizontal distance from the target and the receiving end to the intersection point of the virtual linear track and the base line and an included angle between the virtual linear track and the base line; and (4) calculating the forward sound scattering Doppler frequency shift of the target at each moment by using the parameters calculated in the steps (2) and (3). According to the method, a problem that the forward sound scattering Doppler frequency shift cannot be calculated when the target motion trail is irregular in the prior art is solved.

The invention discloses a fixed-depth marine acoustic information acquisition system based on a wave glider, and belongs to the field of marine environment detection equipment. The objective of the invention is to solve the problems of difficult long-time continuous observation, limited observation range and large noise interference of detection information of an existing marine acoustic information acquisition system. The wave glider of the system is located on the water surface, and an underwater towed body is connected to the wave glider through a fixed-depth towing cable and a telescopic damping mechanism; the fixed-depth towing cable is a carrier for the wave glider to communicate with the underwater acoustic towed body; an acoustic beacon is arranged on the wave glider and is used for sending positioning acoustic pulses to the underwater three-dimensional acoustic three-dimensional array at regular time; a hydrophone converts acoustic signals in the ocean into electric signals, and an acoustic data acquisition and transmission module acquires and filters the signals and synchronously stores the signals in an internal memory in combination with accurate longitude and latitudeinformation of the underwater three-dimensional acoustic three-dimensional array. The system is mainly used for acquiring fixed-depth marine acoustic information.

The invention belongs to the field of underwater acoustic detection, underwater acoustic positioning, sonar technology and the like, and relates to a seabed acoustic array formation estimation method by utilizing sound field interference characteristics. According to the method, corresponding time for a sound source to achieve each hydrophone at the seabed at the same distance is obtained through a sound field interference structure formed by single-frequency continuous signals of a known sound source position so as to construct equations, and formation estimation of a seabed shore array is performed. When the aperture of the array is larger, the sound field interference effect received by each hydrophone is more obvious, so that the method is particularly suitable for a large-aperture horizontal array. According to the method, the steady information of the sound pressure amplitude received by the horizontal array is fully utilized, marine acoustic environment parameter measurement does not need to be carried out, and transceiving synchronization is not needed, so that the method is low in required equipment requirement, low in test design and cost and simple and efficient in calculation in practical application. The method can be applied to the real-time correction of large-aperture horizontal arrays in shallow sea and deep sea environments.

The invention discloses a suspended marine environment acoustic characteristic comprehensive measuring device with a receiving/transmitting function. The device comprises a solar panel, a floating body tank, a storage battery, a charger, a cable sliding watertight piece, a salinity sensor, a temperature sensor, a pressure sensor, an anchor block, an integrated cable, a vector hydrophone, a cable wheel, a speed reducer, a servo motor, a controller, a data processing module, a GPS module, a Beidou communication module, a GPS antenna and a Beidou communication antenna. One end of the integrated cable is connected with the data acquisition and processing module and enters seawater through the cable wheel and the cable sliding watertight piece, the anchor block is arranged at the tail end of the integrated cable, the vector hydrophone and the sensors are arranged on the integrated cable, data collected by the sensors are sent to the data acquisition and processing module through the integrated cable and then sent to the controller after being processed, and a solar power generation device charges the storage battery through the charger. According to the invention, the vector hydrophoneis taken as a core, so that the marine acoustic characteristic parameters can be measured comprehensively, accurately and for a long time in an energy self-supplementing manner.

The invention relates to a static ocean reverberation measurement and acquisition method and device. The method comprises the following steps: acquiring calibration parameters measured by a survey ship at a central site of a site sea area; adjusting and binding transmitting and receiving parameters of a hydrophone at the central site according to the calibration parameters; arranging at least one buoy or subsurface buoy at the central site according to the transmitting and receiving parameters; and based on the at least one buoy or subsurface buoy, receiving an acoustic signal emitted by the survey ship at each corresponding measuring point along each measuring line radiated outwards from the central station, and carrying out reverberation characteristic statistical analysis. No matter from equipment configuration or from survey line, survey point and route setting, while the reverberation survey target is ensured to be achieved, the acoustic propagation survey requirement is considered to the greatest extent, the marine acoustic survey cost can be well reduced, the survey efficiency can be well improved, and the blank in the related aspect of marine acoustic survey is filled up.

The invention belongs to the technical field of marine acoustics application of three-dimensional temperature-salinity-depth data, and particularly relates to a high-resolution sound velocity profile sparse coding and storage method based on dictionary learning. The implementation process comprises calculating the seawater sound velocity profile data of a global sea area; traversing all longitudes and latitudes to uniformly extend the data depth to a seabed sedimentary layer; sequentially arranging and combining a target matrix according to the sampling moments under different longitude and latitude grid points; performing sparse coding on an original data matrix by using an over-complete dictionary; and carrying out CSR storage on a sparse matrix. According to the method, a compression storage technology is provided for the large-scale sound velocity profile data based on global high-resolution ocean reanalysis products, and the data application and communication are facilitated; under the condition that data errors are ensured, the related data is greatly compressed, and the beneficial effect that more than 80% of the high-resolution and long-time sequence sound velocity profile data is compressed is obtained.

The invention relates to the field of marine acoustic instruments, in particular to a cable type acoustic emission subsurface buoy capable of monitoring underwater equipment in real time and a monitoring method thereof.The cable type acoustic emission subsurface buoy comprises ashore equipment, underwater equipment and a submarine cable used for connecting the ashore equipment and the underwater equipment, the ashore equipment comprises photoelectric signal conversion equipment, information source equipment, power amplification equipment, time service equipment, uninterruptible power supply equipment and state display and monitoring equipment; the underwater equipment comprises transducer equipment, a subsurface buoy supporting and protecting structure, a photoelectric separator, a photoelectric conversion module, a sealed cabin, a power conversion and main control module and a plurality of sensing equipment. The cable type underwater acoustic emission subsurface buoy has the basic functions of the cable type underwater acoustic emission subsurface buoy, real-time underwater equipment state monitoring and fault positioning can be achieved, maintenance and guarantee of testers are facilitated, long-time underwater normal operation of the subsurface buoy is guaranteed, and the maintenance and guarantee difficulty and cost of the subsurface buoy are greatly reduced.

The invention belongs to the technical field of high-performance calculation and calculation marine acoustics crossing, and particularly relates to a multi-core parallel method of a ray underwater sound propagation model. The method comprises the steps: analyzing a hot spot area of the ray underwater acoustic model through a performance analysis tool, carrying out parallelism analysis on a hot spot function of the ray underwater acoustic model, designing a multi-core parallel strategy, and adopting an OpenMP programming model to realize multi-core parallelism of the ray underwater acoustic model. According to the method, a parallel computing framework of a ray underwater sound propagation model is constructed, the calculation efficiency of a ray underwater sound propagation sound field is effectively improved, and the parallel efficiency of 60% or above is obtained for sound field calculation of a multi-core CPU calculation platform and a typical marine environment; and a rapid sound field calculation model is provided for sonar performance forecasting, underwater target positioning, marine environment parameter inversion and the like.

The invention discloses a networking suspension type buoy measuring device and method for a marine acoustic active launching system. The device comprises a top shell, a buoy body and a power supply module, and the bottom of the buoy body is fixedly provided with a bottom floating seat; a buoyancy assembly is arranged outside, the device is arranged on the sea level, if the flow velocity on the sea level changes suddenly, unstable water flow enters a monitoring assembly, at the moment, an immersed pressure sensor in the monitoring assembly monitors flowing water, after monitoring data reach the standard, a deflection motor can drive a side positioning assembly at one end of the deflection motor to deflect, after deflection, the buoyancy assembly loses limitation, the buoyancy assembly can automatically deflect due to restoring force of a connecting spring, automatic release of the buoyancy assembly is achieved, the buoyancy assembly can be erected on the water surface, the design is reasonable and ingenious, the function of automatically monitoring and automatically expanding the contact area between the device and a water body can be effectively realized, the stability of the device is greatly improved, and the stability and precision of measurement are ensured.