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| Number | Title | Issue Date |
| 7929375 | Method and apparatus for improved active sonar using singular value decomposition filtering The invention is a method for improved active sonar using a singular value decomposition filtering and a Volterra-Hermite Basis Expansion to model real active sonar measurements. The fitting model minimizes the sum of the squared errors between a measured channel re... | 04/19/2011 |
| 7924653 | System and method of range estimation A system and method of range estimation are disclosed. In one embodiment, the method comprises transmitting beams through a medium towards a surface, receiving reflected signals from the surface, and estimating range to the surfaced based on the reflected signals an... | 04/12/2011 |
| 7876645 | System and method for detecting obstacles for vehicles The present invention refers to a system for detecting obstacles for vehicles, comprising at least one sensor able to transmit a detection signal and to receive an echo signal reflected off at least one obstacle, means of parametric evaluation of said received echo ... | 01/25/2011 |
| 7852709 | Sonar system and process A sonar system and method of use capable of discriminating a direct acoustic signal present at 60 dB or more above the acoustic echo signal. ... | 12/14/2010 |
| 7663975 | Underwater detection apparatus An underwater detection apparatus for detecting a target by transmitting and receiving an ultrasound signal is provided. The apparatus includes a replica memory module for storing the typical amplitude evolution of a seawall echo during a predetermined time period a... | 02/16/2010 |
| 7643376 | Direction detecting device and direction detecting system In a direction detecting device, a transmitting wave generator encodes a transmitting signal with a code having a high autocorrelation so as to generate a transmitting wave. A transmitter transmits the transmitting wave and a plurality of receiver elements receives ... | 01/05/2010 |
| 7535796 | System and method for position determination of objects A method and a system for detection and position determination of chips, which transmit ultrasound signals in a room. The system comprises electronic identification chips, which are attached to objects that have to be monitored. Each chip is equipped with a transmit... | 05/19/2009 |
| 7423933 | Method for visualization of echoes received by an active sonar using a line spectrum emission The invention relates to a method for the visualisation in a single image of the useful information obtained by the operation of an active sonar with line spectrum emission. The method permits an operator to simultaneously view the echoes which may need monitoring a... | 09/09/2008 |
| 7363177 | Apparatus and method for performing the time delay estimation of signals propagating through an environment A system and method for increasing the accuracy of time delay estimates of signals propagating through an environment. The system includes one or more sensors for receiving a plurality of signals, and a time delay estimator for measuring time delays between multiple... | 04/22/2008 |
| 7355925 | Signal-processing method and active sonar implementing same The invention relates to the field of underwater acoustics and more particularly to the field of signal processing in a low frequency (LF) active sonar system. The present invention makes it possible to decrease the false alarm rate while retaining the classi... | 04/08/2008 |
| 7333392 | Method for estimating and reconstructing seismic reflection signals A method for reconstructing seismic data signals of poor quality to improve the signal-to-noise ratio of the data for display and analysis in connection with the selection of drilling sites for recovery of hydrocarbons. The method includes providing a signal model b... | 02/19/2008 |
| 7321882 | Method for supervised teaching of a recurrent artificial neural network A method for the supervised teaching of a recurrent neutral network (RNN) is disclosed. A typical embodiment of the method utilizes a large (50 units or more), randomly initialized RNN with a globally stable dynamics. During the training period, the output units of ... | 01/22/2008 |
| 7295492 | Method and apparatus for correlation sonar A correlation SONAR that provides improved velocity estimates due to a reduction in random and bias errors is disclosed. Rather than basing the velocity estimate on a single set of primary receiver pairs, one or more additional velocity estimates are generated based... | 11/13/2007 |
| 7290451 | Status discriminating apparatus of human, animal, machine or the like using ultrasonic vibration detecting sensor, and status discriminating method of human, animal, machine or the like using the same A human or other status discriminating apparatus includes an ultrasonic vibration detecting sensor comprising a container main body, a liquid packed tightly in the container main body, and an ultrasonic vibrator for transmitting ultrasonic waves into the liquid and ... | 11/06/2007 |
| 7289391 | Narrowband phase difference measurement technique for sonar applications The present invention is directed to a sonar system that includes a transmitter configured to direct multi-frequency transmit signals into a propagation channel. Each multi-frequency transmit signal includes a first frequency and a second frequency. A receiver is tu... | 10/30/2007 |
| 7289388 | Estimation of background noise and its effect on sonar range estimation A system and method for estimating the SNR in a sonar environment and for determining the effect of the estimated SNR on sonar ranging accuracy. The system includes a sensor, a transmitter, a receiver, a plurality of band-pass filters, a cross correlator, and a data... | 10/30/2007 |
| 7275547 | Method and system for determining the location of a medical probe using a reference transducer array The present invention provides systems and methods for determining the coordinates of a location element mounted on a medical probe. First and second signals are transmitted between the location element and a first and second reference transducers, which may be arra... | 10/02/2007 |
| 7257148 | Radio transmitting apparatus, radio receiving apparatus, radio transmitting method, and radio receiving method A spread code sequence generator generates a spread code sequence with the frequency of a synthesizer, and then outputs the spread code sequence to a multiplier. The multiplier outputs a spread signal obtained by multiplying a data sequence by the spread code sequen... | 08/14/2007 |
| 7239580 | Noise adaptive sonar signal processor A system and method of performing sonar range estimations in a noisy sonar environment. The system includes a sensor, a transmitter, a receiver, a plurality of band-pass filters, a cross correlator, and a data analyzer. The transmitter transmits a pulse through a tr... | 07/03/2007 |
| 7194139 | Image compression A method of image compression, comprising: providing image-data encoding light; transforming said light from an image space to a transform space utilizing an optical component; and converting said transformed light into electrical signals, which electrical signals r... | 03/20/2007 |
| 7176647 | Light-emitting device having a phosphor particle layer with specific thickness A method and system for controlling the speed of security gate depending on its length is disclosed. It includes a system for determining the length of a gate that the system is working with and which automatically sets the speed of movement of the gate based on len... | 02/13/2007 |
| 7170252 | Location aware automata An automaton configured to perform a task comprises a communication interface to communicate positional information with one or more anchor points provided within a given environment. The positional information enables generation of mapping information of the given ... | 01/30/2007 |
| 7149148 | Localization of high speed vehicles using continuous transmit waves The selection of multiple, suitably designed, demodulation reference signals can enable the measurement of a vehicle's speed using continuously transmitted frequency modulated (CTFM) signals. The unique solution of vehicle speed can be used to resolve the range Dopp... | 12/12/2006 |
| 7139067 | Three-dimensional imaging with multiframe blind deconvolution Methods and systems for three-dimensional imaging through turbulence such as produced by the Earth's atmosphere are described. A first light source may direct an output of pulses to a target through atmospheric turbulence. A first image sensor, for example a time of... | 11/21/2006 |
| 7139220 | Dynamic filter tuning for pulse-echo ranging systems Dynamic tuning of a tunable filter within the receiver of a pulse-echo ranging system. A filter tuning module compares a transmit signal and a filtered signal to obtain a phase difference indicative of any mis-match between the resonant frequency of the tunable filt... | 11/21/2006 |
| 7137062 | System and method for hierarchical segmentation with latent semantic indexing in scale space A system and method for automatically generating a hierarchical table of contents or outline for indexing a document and identifying clusters of related information in the document. The document may comprise text, audio, video, or a multimedia presentation. The inve... | 11/14/2006 |
| 7054229 | Multi-line towed acoustic array shape measurement unit An acoustic array comprising a plurality of nodes attached to two or more lines. Some or all of the nodes include an emitting transducer and a receiving hydrophone, and the balance include only a receiving hydrophone. Each emitting transducer has associated electron... | 05/30/2006 |
| 7050355 | Determining the orientation of a seismic receiver, a seismic receiver, and a method or seismic surveying The invention provides a method of determining the orientation of a seismic receiver (4, 6) from seismic data acquired at the receiver (4, 6). The determined orientation can be taken into account in subsequent analysis of the seismic data. This avoids ... | 05/23/2006 |
| 7034744 | Method for processing output or base signals from a device for determining a distance of an object To provide a method of processing output or base signals (S), in particular intermediate frequency output or base signals, from at least one device, in particular at least one radar device, for determining a distance (d), in particular a small distance on the order ... | 04/25/2006 |
| 7016503 | Adaptive equalizer for variable length sound tubes utilizing an acoustic pressure response measurement A test signal is generated in a device having a sound tube and a microphone. An acoustic wave is generated in the sound tube from the test signal. The acoustic wave is received at the microphone to estimate an acoustic pressure response. The length of the sound tube... | 03/21/2006 |
| 6996055 | Optical recording medium and method for optically recording data in the same An optical recording medium includes a substrate, a first recording layer formed on the substrate and containing an element selected from the group consisting of Si, Ge, C and Al as a primary component, and a second recording layer located in the vicinity of the fir... | 02/07/2006 |
| 6952649 | Petroleum exploration and prediction apparatus and method A method for predicting the state of a geological formation. The method may include generating a separation key effective to extract a first feature from a signal or signals corresponding to a first state and a second feature, distinct from the first feature, from a... | 10/04/2005 |
| 6935177 | Method for an entropy filter echo processing in time-of-flight or level measurement systems A method for processing echoes in a time-of-flight ranging system or level measurement system. The method comprises applying an entropy filter to the echo profile. The entropy filter comprises determining the information content in the echo profile. The entropy filt... | 08/30/2005 |
| 6922494 | Automated image scaling The present invention provides a method and apparatus for capturing an image of a persons head, or other object, positioned in front of a camera and accurately scaling the head based on the distance of the head from the camera. A sonar system is used determine the d... | 07/26/2005 |
| 6904367 | Petroleum exploration and prediction apparatus and method A method for predicting the state of a geological formation. The method may include generating a separation key effective to extract a first feature from a signal or signals corresponding to a first state and a second feature, distinct from the first feature, from a... | 06/07/2005 |
| 6839303 | Matched filter, receiving beam-forming apparatus and sonar system A received beam-forming apparatus is disclosed is which echo signals received by multiple ultrasonic transducer elements arranged in a linear form are sampled at a specific scanning frequency to obtain sample data. A receiving beam-forming apparatus includes a memor... | 01/04/2005 |
| 6771561 | Sonar system especially for shallow water application such as in littoral environments In order to optimize detection of targets from a broadband return, a multiplicity of narrow bands are matched-filter processed simultaneously in parallel. The band or bands which provide the best joint combination of target and propagation in response are used for t... | 08/03/2004 |
| 6738313 | System for detecting distances using chaotic signals A system for detecting distances for vehicle and robotic applications includes a transducer for generating a transmission signal to be sent in the direction of an obstacle, and for obtaining a receiving signal corresponding to an echo produced by the reflection of t... | 05/18/2004 |
| 6714481 | System and method for active sonar signal detection and classification A sonar system and method are provided to extract and identify information about a particular target illuminated by an active sonar system. The present invention utilizes a Volterra Series Expansion in conjunction with a least squares procedure to estimate channel a... | 03/30/2004 |
| 6636816 | Vector signal analysis method and apparatus therefor An error-suppression signal measurement system and method therefor is provided. The system transmits a test signal from a first probe, through a device under test, and into a second probe. The probes extract normalization signals from reference signals th... | 10/21/2003 |
