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8009507 |
System and method for adaptable aperture planar phased array
A system for an adaptable aperture planar array for maintaining source resolution is provided. The system includes a first nested array defining a first aperture responsive to a first range of...
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7847925 |
System and method of acoustic doppler beamforming
A system and method for forming acoustic beams is disclosed. One embodiment is an acoustic system configured to generate a plurality of beams non-orthogonal to a transducer array simultaneously...
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7787638 |
Method for reproducing natural or modified spatial impression in multichannel listening
The invention concerns a method for reproducing spatial impression of existing spaces in multichannel or binaural listening. It consists of following steps/phases: a) Recording of sound or impulse...
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7489592 |
Patch test for 3D sonar data
A method of automatically performing a patch test for a sonar system is disclosed, where data from a plurality of overlapping 3D sonar scans of a surface as the platform is moved are used to...
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7242638 |
Method and system for synthetic aperture sonar
A method and system for synthetic aperture sonar provide improved position estimates of a receive array as in moves through a body of water.
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7239263 |
Platform shake compensation method in synthetic aperture processing system
The present information comprises the stages of: applying frequency analysis to positional information on a platform, generating virtual positional information on the platform based on a frequency...
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7224640 |
Underwater acoustic bearing sensor
In an underwater acoustic bearing sensor, the vector sensor, heading sensor, and pitch and roll sensor are held in a common mounting ring to ensure that their coordinate systems are collinear. The...
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7193930 |
Quantitative echo sounder and method of quantitative sounding of fish
A quantitative echo sounder includes delay circuits, phase correction circuits, an incidence angle calculator and a directivity correction unit. The delay circuits adjust transmission start timing...
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7075858 |
Signal processing method for a towed linear antenna
The disclosure relates to a signal processing method for a towed linear antenna, notably to resolve right-left ambiguity, said antenna comprising a set of hydrophone multiplets each with n≧3 h...
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6912176 |
Active element array apparatus for displaced phase center systems
A synthetic aperture side looking sonar system which includes an array of active elements, which provide output signals in response to acoustic reflections received from a target area, during...
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6577556 |
Free-floating altitude stabilized system
A free-floating altitude stabilized system is provided. Independently energizable wire coils are linearly aligned with one another in a vertical direction on a buoyant body. An induced magnetic...
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6201763 |
Depthimeter
The depthimeter comprises a heave sensor, a mean path compensator and a combiner. The mean path compensator comprises a ranging device which measures the instantaneous distance of the vehicle from...
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6185505 |
Broad ocean bathymetric fix
A method of correcting errors in in inertial navigation system, without imposing restrictions on the ships course, utilizing bathymetric data collected during the Ocean Survey Program (OSP). As the...
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5883856 |
Power switching method for marine seismic acquisition systems
An improved bottom cable for a seismic marine data acquisition system 10. The bottom cable 30 includes a cable section 30b having a bus 48. The cable, along with the cable section and bus, are used...
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5781504 |
Shallow water beamforming methodology for toroidal volume search sonar
An apparatus and method for beamforming for a toroidal volume search sonar. onar array vehicle motion is used to reduce reverberation by fixing beams geometrically in space to prevent beam contact,...
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5528554 |
Linear array lateral motion compensation method
A method for compensating for lateral distortion in a moving linear array using a frequency domain beamformer, comprising the steps of measuring the instantaneous lateral distortion of the linear...
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5485432 |
Method of measuring the acoustic backscatter property of the floor of bodies of water
A method is provided for measuring the acoustic backscatter property of the floor of a body of water in which an acoustic multibeam echosounder employed on a ship is used to measure the sonic...
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5390152 |
Forward looking echosounder
A forward looking echosounder uses a non-scanning forward looking transducer inclined from the horizontal at a 45° angle. The forward looking transducer produces a set of acoustic data signals ...
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5331603 |
Magnetic heading sensor alignment and roll reducing device
A magnetic heading sensor alignment and roll reducing device is provided. A enerally cylindrical assembly has a first end and a second end. Each end has a plurality of grooves located equiangularly...
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5317542 |
Ship's attitude data converter
Ship's attitude parameters, including pitch, roll and heading, provided in he form of synchro signals by redundant sensors, are distributed to various shipboard systems by a synchro selector binary...
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5299173 |
Method and apparatus for underwater sonar scanning
A sonar buoy 40 has narrow-beam sonar heads 80, 82 driven by a stepper motor 84. The heads produce sonar data for example accurately measuring the seabed. The buoy is handled by a crane wire 41...
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5245586 |
Apparatus and method for suppressing reflections at an ultrasound transducer
For suppressing reflections of an acoustic reception signal at a transmitting/receiving ultrasound transducer, the ultrasound transducer is connected to a compensation circuit which supplies the...
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5142497 |
Self-aligning electroacoustic transducer for marine craft
A transducer apparatus for marine pleasure craft employs only gravity-induced forces to always orient its electroacoustic transducer in a downward direction or other predetermined direction. The...
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5097451 |
Radial damper disk
A motion dampening device is described that is efficiently and conveniently ackaged with sonobuoy components to reduce the effects of vertical motion caused by surface waves or internal buoyant...
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5089988 |
Method and apparatus for compensating sensitivity fluctuations in a hydrophone transducer array
A method and apparatus for compensating sensitivity fluctuations in signals received from respective groups of hydrophones for the purpose of subsequent signal processing, the groups being arranged...
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5077696 |
Floating sensor to detect very low frequency pressure signals
A floating sensor system is provided to detect very low frequency pressure ignals (down to 0.01 Hz). This system detects pressure fluctuations or pressure signals of interest in the ocean or other...
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5058082 |
Linear hydrophonic antenna and electronic device to remove right/left ambiguity, associated with this antenna
A linear hydrophonic antenna with an associated portside/starboard ambiguity removing device comprises three streamers placed in an equilateral triangle, with a center distance of the order of a...
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5020034 |
Directional antenna with multiple transducers, in particular for a sonar
Antenna, in particular for a sonar, allowing to form directional channels by feeding the transducers by a reduced number of sources by means of an interpolation network that permits to maintain to...
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5008863 |
Low noise sonar support system
A sonar support system that is suspended beneath a ship in a low drag U-sed hydrofoil mounting assembly is provided. The assembly is attached at its upper end to suitable means for pivotally...
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4953145 |
Active phase quieting target highlight detector
An active phase quieting target highlight detector using phase and magnitude detection. In contrast to classical magnitude-only detection schemes, the present invention, by combining phase...
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4929952 |
Search-radar azimuth correction
A system for generating a corrected azimuth signal for a radar system hav a radar antenna and a radar display where the radar antenna is mounted on a craft that is subject to motion and that has a...
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4893284 |
Calibration of phased array ultrasound probe
The dynamic range of ultrasound images is extended by providing compensation of errors inherent in the manufacturing process of medical ultrasound phased array probes. Time delay errors are...
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4780860 |
Beam forming device
The present invention relates to a beam forming device for forming a uniform radiation beam and/or a reception beam. In radiation, the transducer is vibrated in such a way that the pressure of a...
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4697253 |
Sonar heave compensation system
A ship-borne sonar heave compensation system measures the heave at time of transmit and at the expected time of receive of a bottom-echo which is approximated by the previous depth determination...
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4485462 |
Transducer mounting apparatus
Apparatus for remotely controlling the horizontal and vertical direction of a pendulously suspended transducer by means of concentric generally vertical control shafts is disclosed. A frame in...
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4454597 |
Conformal array compensating beamformer
A narrow band compensating beamformer for a receiving array that conforms some surface other than a plane and thus is, in general, three dimensional. The array comprises a number of sensing...
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4422076 |
Passive synthetic aperture system for locating a source of electromagnetic radiation
A vehicle-mounted passive synthetic aperture system for locating a source of electromagnetic radiation having a given wavelength λ. The system includes first and second receiving antennas, a phase ...
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4345473 |
Vertical component accelerometer
An accelerometer for measuring the vertical component of acceleration independent of the accelerometer orientation or the pressure. The accelerometer is particularly adapted for use in marine...
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4313184 |
Sonar systems
A side scan sonar system comprises a sonar transmitter transducer means for transmitting sonar signal pulses so as to produce an arc of insonification extending to one side of a line along the...
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4302824 |
Seismic survey apparatus
A seismic survey apparatus comprises circuit arrangements for providing a train of first signals each corresponding to a sound wave transmitted towards the sea bed, and circuit arrangements for...
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4244036 |
Electronic stabilization for displaced phase center systems
In moving target indication or synthetic aperture systems, double pairs of measurements of returned energy are made from displaced spatial locations to enable computation of side and angular...
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4222266 |
Body motion compensation filter with pitch and roll correction
An electronic filter for use in determining the position of a body travelling through water relative to a datum such as mean sea level, and having specific application to underwater seismic systems...
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4190818 |
Digital beamsteering for a parametric scanning sonar system
Digital beamsteering for a parametric scanning sonar steers a nonlinear, ulated signal of a single high frequency by appropriately delaying and/or varying the phase of the signal as it enters each...
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4187490 |
Range determining system
Discrimination of long range targets from short range targets is provided by generating a vertical dipole beam and a narrow uni-directional horizontal beam which may be steered. Targets in the...
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4179682 |
Tilt compensation for acoustic transducing system
A tilt compensated transducer array is provided with omni-directional transducers, compensated bi-directional transducers, and a processor which forms omni and bi-directional beams that are...
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4144518 |
Stabilized-transducer driving device for underwater ultrasonic detection system
A gravity stabilized drive mechanism varies the orientation of an underwater ultrasonic transducer in both azimuth and elevation while stabilizing the transducer against the pitching and rolling of...
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4104608 |
Heave meter
A contour mapping system including compensation for the heave or vertical displacement of a ship due to wave and swell effects, and for correcting errors due to such effects in depth or bottom...
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4052693 |
Depth sounder
A depth sounder in which the transducer beam is in the form of a section of hollow cone. With the hollow conical beam, the slant range to the bottom in all directions is the same and minimum depth...
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4038654 |
Indication device in plan position indication system
A plan position indicating system which includes a display screen and means for indicating on the screen the tilt angle of the transmitted beam and received signals to enable measurement not only...
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4037189 |
Method and apparatus for determining the profile of an underwater pipeline
A system for measuring and displaying the side and top profiles of an underwater pipeline as the pipe line is being laid on the sea floor by a pipe laying vessel. The profiles are determined by...
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