Matches 101 - 150 out of 252 < 1 2 3 4 5 6 >
Match Document Document Title
6130641 Imaging methods and apparatus using model-based array signal processing  
An apparatus and method for imaging uses a transducer array which receives a scattered signal from a region of interest. The method analyses the scattered signal on the basis of a model which...
6121894 Low cost time domain reflectometry system for bridge scour detection and monitoring  
An apparatus for detecting and monitoring scouring around a structural mer uses time-domain reflectometry (TDR) to measure the level of sediment around a submerged portion of the structural member...
6108272 Method and apparatus for locating diver(s) from a surface station and alerting the surface station of a diver emergency  
A system and method for determining the geographic relationship between a surface station and at least one diver, including a first and second devices for sending passive or active select signal...
6100700 Bridge scour detection and monitoring apparatus using time domain reflectometry (TDR)  
An apparatus for detecting and monitoring scouring of a bed of sediment bath a body of water uses time-domain reflectometry (TDR) to measure the level of sediment adjacent to underwater sensors....
6088297 Acoustic sound speed profiling system  
An acoustic sound speed profiling system is provided. The system includes a sound emitter and a series of sensors or hydrophones spaced vertically in a water column. The sound emitter is a...
6075753 System for simulation of underwater explosion pressure fields  
An array of piezoelectric transducers from which acoustical energy is emid at a low and high frequency within a predetermined frequency band, synthesizes a localized underwater simulation of a...
RE36643 Buoyed sensor array communications system  
A buoyed sensor array communications system comprises multiple sensor syss electrically connected to a signal transmission line which are positioned at predetermined locations along the signal...
6009185 Neural network based contact state estimator  
A method is described for providing an estimate of the state of a stationary or moving contact in a three dimensional ocean. The method comprises the steps of collecting information about a...
6002644 Imaging system and associated method for surveying underwater objects  
A system for surveying an underwater topography includes an ultrasonic sensor array disposable in physical contact with a body of water for generating electrical signals encoding ultrasonic echo...
5978316 Marine seismic source  
A seismic acoustic signal source includes a hull that has a wetted surface in contact with a body of water. When underway, the draft of the hull is substantially zero. An acoustic signal generator...
5956291 Underwater diving assistant apparatus  
An underwater diving assistant device. In one embodiment, the present invention comprises a hand-held unit including a display screen. Messages and drawings are written on the display screen using...
5917413 Water entry alarm system which protects against false triggering and method therefor  
A high sensitive water entry alarm system which prevents outside noise from falsely triggering the alarm system. A transmitter generates ultrasonic timed acoustic bursts at a fixed frequency when...
5907281 Swimmer location monitor  
A system is disclosed for locating swimmers who could be in danger of drowning, as determined by preset parameters such as the time duration that they remain at a depth where breathing is...
5894450 Mobile underwater arrays  
An oceanographic sampling system includes two or more underwater vehicles disposed in an array and an array controller for controlling the array of underwater vehicles as data is acquired. Each...
5877999 Method and apparatus of interrogating a distributed undersea optical surveillance system  
A method and apparatus for discriminating digital data received from a plurality of spatially distinct acoustic sensing nodes of a distributed undersea optical surveillance system. The present...
5841735 Method and system for processing acoustic signals  
A method for processing acoustic signals received by first and second undater detectors, spaced from each other, for detection and determination of range and bearing of an underwater signal source,...
5838816 Pattern recognition system providing automated techniques for training classifiers for non stationary elements  
An improved pattern recognition system. The invention operates on a plurality of feature vectors from a single class of data samples. The inventive system estimates a pruning radius for the feature...
5822272 Concentric fluid acoustic transponder  
An acoustic transponder method and apparatus provides a high degree of frency and target strength selectivity by utilizing two or more concentrically disposed, hollow spheres each containing...
5790471 Water/sediment interface monitoring system using frequency-molulated continuous wave  
The water/sediment interface in a body of water near bridge piers and simr structures exposed to scour, is sensed and transformed by a frequency-modulated continuous wave method into an audio...
5784337 Towed array with non-acoustic sensor module  
A towed array includes an array of N hydrophone groups and one or more nocoustic sensor modules structurally connected in-line with the array of hydrophone groups. The hydrophone groups and...
5784338 Time domain reflectometry system for real-time bridge scour detection and monitoring  
An apparatus for detecting and monitoring scouring around a structural mer uses time-domain reflectometry (TDR) to measure the level of sediment around the submerged portion of a structural member...
5777948 Method and apparatus for preforming mutations in a genetic algorithm-based underwater target tracking system  
A method for performing mutations in a genetic algorithm-based underwater oustic contact tracking system includes the steps of: (i) providing an initially ordered list of bit numbers; (ii)...
5774421 Underwater measurement device  
An underwater measurement device includes a housing for disposition on a bed surface, an opening defined by the housing, a buoy for disposition in the opening and buoyant so as to be floatable out...
5734623 Fiber optic sound velocity profiler  
A fiber optic cable, coated to increase its sensitivity to acoustic press, is towed through a medium. The optical fiber contains Bragg grating sensors at regular intervals along its length. A...
5717657 Acoustical cavitation suppressor for flow fields  
A cavitation suppressor using acoustic energy to suppress flow field caviion is provided. The suppressor system has a plurality of pressure transducers located along the outer surface of a sonar...
5708626 Trajectory measurement system for underwater vehicles  
A system for determining the velocity and trajectory of an underwater vehe comprises a data acquisition processor coupled to a plurality of sensors providing depth, heading, pitch and yaw data for...
5701276 Underwater communication system by means of coded pulses  
An underwater communication system by coded pulses, includes a transmitter placed at a surface of a body of water, for transmitting coded pulses, the transmitter having a transmitter circuit for...
5688405 Method and apparatus for separating particulate matter from a fluid  
A method and apparatus for filtering particulate matter entrained in a fl entering a port from a reservoir. First and second ultrasonic wave generators produce ultrasonic waves to define a...
5688406 Method and apparatus for separating particulate from a flowing fluid  
Apparatus and methods for filtering particulate matter from a fluid traveg proximate a surface containing a port. First and second ultrasonic wave generators produce superposed ultrasonic waves to...
5687137 Methods and apparatus for adaptive oceanographic sampling  
An adaptive oceanographic sampling system includes several stationary acoustic tomography units distributed in an ocean volume, a processing and control system and at least one underwater vehicle...
5668778 Method for detecting acoustic signals from an underwater source  
A method for detecting radiated and reflected acoustic signals from an unwater source, wherein the acoustic signals are present in a random noise environment and form an output therewith. The...
5666327 Portable acoustic turbulence detector  
The present invention relates to a system for studying, identifying and cacterizing thermal gradients within a volume of water. The system includes a frame formed from a plurality of PVC tubing...
5648940 Pulse coded sonar having improved doppler determination feature  
The signal appearing at the receiver input of a pulse code active sonar dng a return echo period, is sampled, time compressed and stored in a memory. The time compressed sample is successive...
5642330 Sea state measuring system  
A towed buoy is deployed to a known depth below the surface from a submar and this depth is maintained by a control system that includes movable fins on the buoy. The movement of the buoy body and...
5642331 Constant radius acoustic sensor mounting system  
The present invention relates to a system for studying, identifying and cacterizing thermal gradients in a volume of water. The system includes a frame for supporting one or more measuring devices...
5625320 Differential preamplifier and pre-emphasis network  
A preamplifier and pre-emphasis network is provided having a differential plifier exhibiting common mode noise rejection. The preamplifier is particularly suited for use with a double-sided sensor...
5612928 Method and apparatus for classifying objects in sonar images  
A method and apparatus for classifying objects in images utilize means for selecting portions of those images which contain objects and means for classifying those objects based upon parameters of...
5570323 Navigational device for a scuba diver  
A navigational device (10) for assisting a scuba diver in determining a direction toward and a distance from a dive boat (12) or to a buoy near the shore at which point the dive originated. The...
5568450 System and processor for real-time extraction of ocean bottom properties  
A system for characterizing ocean bottom properties in real-time by explong the multipath structure of reverberation to extract values for the bottom loss and the bottom scattering coefficient. The...
5557584 Moderate depth underwater surveillance system  
A system of sonar platforms designed for use in moderate depth water is disclosed, with each platform having a plurality of transducer modules mounted thereon. Each transducer module has a...
5523982 Communication apparatus  
The invention relates to diver-to-diver communication apparatus. There is provided a communication apparatus (2) for diver to diver communication, the apparatus comprising a waterproof casing (4),...
5502688 Feedforward neural network system for the detection and characterization of sonar signals with characteristic spectrogram textures  
The present invention provides a method and system for characterizing the sounds of ocean captured by passive sonar listening devices. The present invention accomplishes this by first generating a...
5493540 System for estimating far-field acoustic tonals  
A system and method for estimating a ship's far-field acoustic characteristics includes at least one reference hydrophone and at least one movable hydrophone, both of which are disposed in the...
5493539 Two-stage detection and discrimination system for side scan sonar equipment  
An automatic method for finding mines in side scan sonar images using a two-stage detection/discrimination process is provided. This method improves the discrimination process by specialized...
5493619 Normalization method for eliminating false detections in side scan sonar images  
A method for eliminating false detections at the water column boundary in side scan sonar images is provided. Each image is filtered by computing the median greylevel value of a pixel and its four...
5488589 Neural network based three dimensional ocean modeler  
A method is described for providing an estimate of the state of a moving tact in a three dimensional ocean. The method comprises the steps of providing a device for estimating the state of the...
5475651 Method for real-time extraction of ocean bottom properties  
A method for characterizing ocean bottom properties in real-time by explong the multipath structure of reverberation to extract values for bottom loss and the bottom scattering coefficient. The...
5471433 System and method for rapidly tracking highly dynamic vehicles  
A trajectory estimation system for estimating a trajectory of a target in sponse to a series of data items which generated in response to motion of the target. The trajectory estimation system...
5463598 Man overboard alert and locating system  
A system for automatically detecting the event of a person or object falling overboard from a vessel into water includes a portable ultrasonic transmitter worn by each person or attached to...
5432750 Vertical array deployment device  
A deployment system is disclosed for deploying a vertical, sub-surface bud, underwater acoustic sensor array in the ocean which includes a mechanical load transfer and cable separation mechanism...
Matches 101 - 150 out of 252 < 1 2 3 4 5 6 >