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7613072 |
System and method for determining directional and non-directional fluid wave and current measurements
A system for determining the directional properties of surface waves or internal waves of a fluid medium includes a sonar system having a plurality of transducers for generating respective,...
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7591787 |
Method for removing Doppler angle ambiguity
A method of measuring blood flow including several steps. In an initial step a first ultrasound beam is oriented in a direction substantially perpendicular to the direction of the blood flow to be...
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7545705 |
System and method for measuring wave directional spectrum and wave height
A system and method for measuring the directional spectrum of one or more waves in a fluid medium using a multi-beam sonar system. In an exemplary embodiment, range cells located within a plurality...
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7542374 |
System and method for acoustic Doppler velocity processing with a phased array transducer including applying correction factors to velocities orthogonal to the transducer face
A system and method for measuring velocity in a fluid medium utilizing a phased array transducer are disclosed. The phased array transducer comprises a plurality of transducer elements arranged to...
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7539082 |
System and method for acoustic Doppler velocity processing with a phased array transducer including using a wide bandwidth pulse transmission to resolve ambiguity in a narrow bandwidth velocity estimate
A system and method for measuring velocity in a fluid medium utilizing a measuring system are disclosed, wherein the measuring system comprises a transducer. In one aspect, the method comprises...
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7518543 |
Method for determining positions of targets by bistatic measurements using signals scattered by the targets
A method for determining the positions of targets by bistatic measurements using signals scattered by the targets is provided in which the velocities of the targets can also be determined. The...
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7420875 |
Methods and systems for use of an acoustic doppler current profiler for measurement of compact jets
A method is provided for improving horizontal spatial resolution of a flow field in compact jet-like current features so as to quantify the axial velocity in the cross section of a compact jet...
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7352651 |
System and method for determining directional and non-directional fluid wave and current measurements
A system for determining the directional properties of surface waves or internal waves of a fluid medium includes a sonar system having a plurality of transducers for generating respective,...
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7317660 |
System and method for measuring wave directional spectrum and wave height
A system and method for measuring the directional spectrum of one or more waves in a fluid medium using a multi-beam sonar system is disclosed. In an exemplary embodiment, range cells located...
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7286443 |
Fast coherent processing for codes with periodic line spectra
The present invention is directed to a method of allowing a computational load caused by the implementation of conventional signal processing methods operating by multicopy correlation, by...
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7209529 |
Doppler compensated receiver
A receiver includes a controller which receives A/D sampled input signals and shifts the sampled digital signal to compensate for Doppler effect in the input signal prior to demodulation. The...
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7069021 |
Method and a system for positioning of an electronic device, and an electronic device
A method is provided for determining the position of an electronic device by receiving a code modulated signal transmitted by satellites, and position information of the satellites and time data,...
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6965753 |
Apparatus for performing doppler correction in a wireless communications system
Apparatus for Doppler correction in a wireless communications system, including a first frequency synthesizer for generating a carrier signal oscillating at a rate responsive to a first input, a...
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6918875 |
Ultrasound measurement apparatus
An ultrasound wave is transmitted from a probe ( 120 ) to a moving reflector ( 130 ) and the reflected ultrasound wave is received back by the same probe ( 120 ). With n-divided wave bands of the...
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6850186 |
System for determining position and velocity of targets from signals scattered by the targets
The present invention relates to a system for using signals scattered by targets to determine position and velocity for each of the targets and comprises a set of transmitters and receivers of...
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6820008 |
System and method for measuring deep sea currents
A system and method for measuring water currents is disclosed in which an oceanographer can profile and display the water currents for an entire water column in real time. The profile is used in...
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6714482 |
Acoustic doppler channel flow measurement system
An improved acoustic Doppler flow measurement system which employs multiple acoustic frequencies to acquire multiple independent backscatter data from the flow channel, combining the data to enable...
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6701252 |
System for underwater GPS navigation
Provided is a system that allows navigation by GPS while underwater by locating the antenna above water and the display below water. In one embodiment, the GPS antenna is attached to a tow-able...
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6691577 |
Ultrasonic moving-speed measuring system
An ultrasonic moving-speed measuring system comprises a piezoelectric substrate, a thickness-vibration mode transducer, an interdigital transducer, and a signal analyzer. The piezoelectric...
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6633617 |
Device and method for compensating or creating doppler effect using digital signal processing
Doppler shift compensation by interpolation of a new sample between successively received signal samples using stored values of an interpolation function. The interpolation function has a non-zero...
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6614719 |
Ultrasonic doppler effect speed measurement
An ultrasound transducer is coupled to a transmitter having a source of ultrasound signal. A receiving ultrasound transducer is coupled to a preamplifier and mixer. The mixer is further coupled to...
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6577267 |
Device and method for contactlessly measuring speed on surfaces
A device for non-contractual measurement of the speed of an object moving over a surface comprises a means for radiating a signal of fixed frequency at an angle onto the surface in or against the...
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6535158 |
Kinematic analysis of conically scanned environmental properties
A method for determining the velocity of features such as wind. The method preferably includes producing sensor signals and projecting the sensor signals sequentially along lines lying on the...
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6317385 |
Aquaculture feeding monitor
The invention is a system for measuring the rate of food pellet loss in a fish farming operation. The fish are held in a seacage in a body of water. Food dropped into the seacage sinks down through...
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6314053 |
Method for detecting mobile objects with active sonar
A process for making it possible to detect moving objects by an active sonar operating by the Dopper effect. The process uses, as a transmission signal, a burst of N pulses encoded so as to present...
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6272071 |
Speed measuring apparatus
A speed measuring apparatus including a transmitter for transmitting an acoustic reference wave toward a moving-target, the acoustic reference wave being generated based on a reference signal with...
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6262942 |
Turbulence-resolving coherent acoustic sediment flux probe device and method for using
This invention describes a new method to estimate the sediment flux in front of a Coherent Acoustic Sediment Probe (CASP) instrument. Also, described is a newly invented Bistatic Doppler Velocity...
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6229761 |
Estimating ship velocity through the water and over the ground
A method and system are provided to estimate a ship's velocity. Two ship sonar returns from two different directions are selected. Each return includes volume reverberation data and bottom...
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5978315 |
Feed waste detector
A method and a device for detecting fodder waste/loss within a fish enclosure (1), where a sound transmitter (4) and a hydrophone (6) are disposed as an upwardly directed echo sounder close to the...
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5969254 |
Phase difference measuring apparatus and method
A phase difference measuring apparatus obtains a first receive signal by transmitting and receiving a to-be-measured material in a reference state and a second receive signal by transmitting and...
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5900834 |
Doppler shift detector
A Doppler shift detector for determining the Doppler shift between a transmit signal and a receive signal uses clocked delay lines. The clocked delay lines count the number of edges in an applied...
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5808580 |
Radar/sonar system concept for extended range-doppler coverage
A method and apparatus for preventing the occurrence of range ambiguities and Doppler ambiguities in both a radar and sonar environment. A series of N pulses are produced, each of which contains a...
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5796679 |
Doppler velocimeter for monitoring groundwater flow
Groundwater velocity and direction of flow are determined by insertion into borehole below the water table of a sound source and a plurality of sound sensors. A periodic sound signal is emitted by...
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5694372 |
Sonar system for current meter and doppler log
A sonar antenna with transducers symmetrically distributed along an axis (fore/aft axis) and a perpendicular axis (starboard/port axis) in a plane on a circular base. Placement and polarities of...
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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...
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RE35535 |
Broadband acoustic doppler current profiler
A system and method for measuring current velocities using coded-pulse broadband acoustic signals. Autocorrelation of two phase coded pulses which are in the water during a single transmission...
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5561641 |
Underwater detection system for determining carrier frequencies of signals arriving from a wide area
The present invention is directed to provide an underwater detection system which can determine frequency components contained in echoes arriving from all azimuthal directions at high speed and...
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5521883 |
Method of remotely determining the three-dimensional velocity of a fluid such as air or water
A method of remotely determining the three-dimensional velocity of a fluid such as air or water, the method consisting in emitting signals of determined frequencies in at least three different...
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5509304 |
Phased array acoustic antenna system
A sound detection and ranging (SODAR) system for taking wind measurements by sending out acoustic pulses and then measuring acoustic energy reflected back to the instrument by the atmosphere. The...
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5444670 |
Method and apparatus for determining soil strength from Doppler-shifted acoustic signatures
A signal processing system for determining sea floor composition based on the frequency waveform and Doppler shift transmitted from an acoustic penetrometer includes a hydrophone for receiving the...
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5428359 |
Doppler-effect vehicle speed sensor using different speed determining rules depending upon receiver output
A Doppler-effect speed detecting apparatus for detecting a ground speed of a motor vehicle, including a transmitter, a receiver for receiving a portion of a wave transmitted by the transmitter and...
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5398216 |
Method for detecting two-dimensional flow for ultrasound color flow imaging
A triangulation method and apparatus for measuring the velocity of a flowing material at a point of interest along two lines of sight which have different vector components. The flow velocity along...
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5327396 |
Underwater detection system
An underwater detection system which searches the water in a wide range of directions and displays moving targets in different colors depending on speeds of the targets comprises an ultrasonic...
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5239139 |
Ultrasonic digitizer pen having integrated ultrasonic transmitter and receiver
An ultrasonic digitizer pen includes an ultrasonic transmitter to transmit ultrasonic waves through the air, to illuminate a writing surface. An ultrasonic receiver receives the waves reflected off...
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5224075 |
Apparatus for measuring the velocity of a moving body
A system measures the velocity of a moving body such as a ship and a water body. The system uses a first apparatus which measures the speed of a moving body by detecting a phase difference between...
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5216639 |
Method for processing a doppler signal
The proposed method permits expansion, compression or reversion of a frequency of a Doppler shift signal. Shift frequency components of a measured Doppler shift signal are multiplied desired times...
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5175709 |
Ultrasonic transducer with reduced acoustic cross coupling
A continuous wave driven ultrasonic transducer for determining doppler frequency shift in reflected ultrasonic pressure waves in which the transmitter and receiver sections are constructed of a...
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5168215 |
Instantaneous frequency measurement apparatus and method
An apparatus and method for measuring the frequencies of a pair of signals simultaneously present in a composite signal, comprising the steps of includes components for squaring the composite...
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5148176 |
Measuring device
The invention relates to a device and process which utilize the Doppler effect for measurement of the performance of blasting operations, in particular to the measurement of face velocity. The...
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5077700 |
Doppler velocity profiler
The velocity of a vessel is determined in real time by a doppler sonar sym providing acoustic beams wherein received beams provide a plurality of bins or returns from various depth segments. The...
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