Abstract: A LIDAR system includes a light source configured to generate an outgoing light signal that includes multiple channels that are each of a different wavelength. The system includes optical components that generate composite light signals. Each composite light signal includes light from a LIDAR input signal combined with light from a reference signal. The LIDAR input signals each includes light that was reflected by an object located apart from the system and that was included also in one of the channels. The reference signals do not include light that was reflected by the object but include light from one of the channels. Each of the composite signals is generated such that the reference signal and the LIDAR input included in the composite signal includes light from the same channel.

Abstract: A light detection and ranging (LIDAR) system may include a laser configured to output a beam, an amplifier and a plurality of splitters. The amplifier may generate, based on the beam, a plurality of amplified optical signals that are respectively associated with a plurality of phases. The plurality of splitters, coupled between the amplifier and a plurality of outputs, may receive the plurality of amplified optical signals, generate, at a first point of time, a first combined optical signal of the plurality of amplified optical signals at a first output of the plurality of outputs with no optical signal at remaining outputs of the plurality of outputs, and generate, at a second point of time, a second combined optical signal of the plurality of amplified optical signals at a second output of the plurality of outputs with no optical signal at remaining outputs of the plurality of outputs.

Abstract: A sensor system includes a LiDAR and a dirt determination unit. The LiDAR includes a light emitting unit configured to emit light to a detection range via a transmissive part configured to transmit light, a light receiving unit configured to receive light emitted from the light emitting unit and reflected by hitting at an object, and a point group information output unit configured to output point group information comprising position information on the object and distance information to the object, based on the light received by the light receiving unit. The dirt determination unit is configured to detect dirt attached to the transmissive part, based on the point group information. The detection range to which the light emitting unit emits light is divided into a plurality of regions including a first region and a second region different from the first region.

Abstract: A distance measurement system includes a light source, a wavelength conversion module that generates a harmonic G1 with which a target S is to be irradiated as guide light by converting a wavelength of a part of a fundamental wave L1 of light L0 emitted from the light source, a photodetector that detects reflected light L1r generated by reflection, on the target S, the fundamental wave L1 that has passed through the wavelength conversion module, and a signal processing unit that calculates a distance to the target S on the basis of a detection result of the photodetector.

Abstract: A system comprising: at least one hardware processor; and one or more software modules are configured to, when executed by the at least one hardware processor, receive a selection of a mission marker; display on a display a diver's position, heading, depth and course history for the selected mission marker; and interface with a heads up display to mirror the data displayed on the display.

Abstract: According to one embodiment, a radio wave information management system includes an information stored unit, a radio wave information determination unit, and a route setting unit. The information stored unit stores radio wave information, and location information and time information associated with the radio wave information. The radio wave information determination unit sets reliability information for the radio wave information based on at least one of the location information and the time information. The route setting unit sets a route of a mobile object based on the reliability information.

Abstract: A computerized system is configured to detect optical and acoustic events. It is operatively coupled to optical sensor(s) and acoustic sensor(s). It comprises a processing circuitry configured to perform the following: (a) receiving optical data from the optical sensor(s), indicative of optical event(s) associated with an event source(s). (b) receiving acoustic data from the acoustic sensor, indicative of acoustic event(s) associated with the event source. The optical sensor and the acoustic sensor are time-synchronized. (c) identifying the optical and acoustic events, based at least on the optical and acoustic data, (d) determining at least one of: distance and direction of the event source, relative to one or more of the optical sensor and the acoustic sensor. The determination is based at least on the optical event, the acoustic event, the optical data and the acoustic data.

Abstract: A detector includes: a detection unit including one or more transmitting elements configured to transmit a frequency modulated continuous wave (FMCW) type transmitted electromagnetic wave, two or more receiving elements configured to receive a reflected electromagnetic wave obtained by the transmitted electromagnetic wave being reflected by a target, a calculation unit configured to calculate a distance to the target and an angle of arrival of the reflected electromagnetic wave using the transmitted electromagnetic wave and the reflected electromagnetic wave, and a position determination unit configured to determine a position of the target using the distance and the angle of arrival; and a detection region setting unit configured to set a predetermined region including the position as a detection region in a detectable range in which the target is to be detected. The detection unit executes detection in the detection region set by the detection region setting unit.

Abstract: Capturing, presenting parameters related to and affecting physical systems to generate a digital twin that helps in operating, maintaining, monitoring, upgrading systems to deliver the desired operational results, such as for distributed antenna systems and in-building systems. Systems, methods are for seamless measurement collection, analysis, and integration with design software to create and maintaining exact as-built digital twins and capturing deviation of deployed systems from designs. Facilitate determining positioning using distributed antenna system with service availability monitoring. Positioning methods include network-based methods, handset-assisted methods in addition to a monitoring system to report any service outage and possible location information loss. Combined monitoring system that monitors antenna output power for mobile coverage and service availability helps also in monitoring the availability of the localization system and dynamic update of lookup information.

Abstract: A computer-implemented method of perceiving structure in a radar point cloud comprises: generating a discretised image representation of the radar point cloud having (i) an occupancy channel indicating whether or not each pixel of the discretised image representation corresponds to a point in the radar point cloud and (ii) a Doppler channel containing, for each occupied pixel, a Doppler velocity of the corresponding point in the radar point cloud; and inputting the discretised image representation to a machine learning (ML) perception component, which has been trained extract information about structure exhibited in the radar point cloud from the occupancy and Doppler channels.

Abstract: A mobile device may receive a plurality of timestamps, wherein the plurality of timestamps indicate sending and receiving time for ranging packets and response packets. The mobile device may calculate a responder turn-around time as a first difference between the second time and the first time. The mobile device may calculate a responding round trip time as a second difference between the second time and the third time. The mobile device may receive from the electronic device an initiator turn-around time and an initiator round trip time. The mobile device may calculate a frequency offset for the wireless protocol using the responder turn-around time, the responding round trip time, the initiator turn-around time, and the initiator round trip time. The mobile device may compare an observed frequency offset to the calculated frequency offset to determine a frequency offset difference and whether it exceeds a threshold, adjusting a ranging measurement.

Abstract: In accordance with an embodiment, a method includes determining a covariance of a plurality of chirps measured by a radar sensor; and determining at least one of a motion and a presence of an object within a field of view of the radar sensor based on the determined covariance.

Abstract: The present application relates to a method for estimating an ambiguous velocity of a target. The method includes: alternately transmitting a first waveform signal and a second waveform signal at a first center frequency and a second center frequency respectively; processing intermediate frequency signals of the first waveform signal and the second waveform signal to generate a first Range-Doppler matrix and a second Range-Doppler matrix respectively; acquiring the quantity of phase convolutions based on a phase difference between the first Range-Doppler matrix and the second Range-Doppler matrix and a beat frequency of the second waveform signal; and estimating a target velocity and a target range through the quantity of phase convolutions. The method has the following beneficial effects: an aliased region and velocity estimation are further improved by using information from a Doppler frequency shift difference, so that the estimation of the ambiguous velocity is more reliable.

Abstract: The present embodiments relates to a radar target tracking device and method. Specifically, a radar target tracking device according to the present embodiments comprises a receiver receiving detection information obtained by detecting an object around a host vehicle every preset period, a sigma point extractor calculating a measurement value for the object based on the detection information and extracting a sigma point for sampling a Gaussian distribution from a probability distribution including a position of the host vehicle and the measurement value, and a process model unit selecting a first process model that is any one of a process model set, applying the first process model to non-linearly convert the sigma point to a random vector, and outputting a mean and covariance of the random vector.

Abstract: A system and method for locating radio-frequency identification tags within a predetermined area. The method can incorporate sub-threshold superposition response mapping techniques, alone, or in combination with other methods for locating radio-frequency identification tags such as but not limited to time differential on arrival (TDOA), frequency domain phase difference on arrival (FD-PDOA), and radio signal strength indication (RSSI). The system can include a plurality of antennas dispersed in a predefined area; one or more radio-frequency identification tags; a radio-frequency transceiver in communication with said antennas; a phase modulator coupled to the radio-frequency transceiver; and a system controller in communication with said transceiver and said phase modulator. Calibration techniques can be employed to map constructive interference zones for improved accuracy.

Abstract: According to an aspect of the present disclosed subject matter, a method comprising: transmitting RF-transmission-signals incorporating at least one frequency produced by an apparatus and radiated in turns by an electromagnetic aerial interface toward each plane of a plurality of planes of a surveyed media; receiving RF-signals reflected from each plane of the plurality of planes in turn by the electromagnetic aerial interface, wherein each one of the RF-signals of each plane is characterized by phases amplitudes and frequencies; assembling a three-dimensional raw data array comprised of a plurality of two-dimensional raw data arrays, wherein each two-dimensional array comprises information elements of a different plane; reconstructing an image from the three-dimensional raw data array using an RF tomography technique, wherein the image depicts morphology and properties of inhomogeneities inside and beyond the surveyed media; and filtering artifacts out of the image based-on analysis of image quality measurem

Abstract: A synthetic aperture radar (SAR) for a flight vehicle may include an elongate phased array antenna oriented with a long axis in an elevation direction. The elevation direction is normal to a direction of flight of the flight vehicle. A transmitter is coupled to the elongate phased array antenna, and a receiver is coupled to the elongate phased array antenna. A controller is coupled to the transmitter and receiver and is configured to generate temporally alternating sets of receive beams for respective swaths to be used to form a SAR image across a surface below the flight vehicle. The same center frequency is used to create consistent SARs for all swaths, allowing for coherent combination between subsequent passes over the same swath.

Abstract: A fast ramp frequency modulated continuous wave (FMCW) radar system (100) is described herein, where the fast ramp FMCW radar system is configured to employ velocity labeled multiplexing (VLM) in connection with generating detections for objects in a scene. Transmitters (110, 112) in the radar system are assigned different velocity labels that corresponds to different phase rates of change of consecutive chirps in signals emitted by the transmitters. Approaches for generating detections based upon echo signals that correspond to the emitted signals are also described herein.

Abstract: An exemplary method for determining a total electron content of a portion of the ionosphere includes: transmitting from a satellite in orbit, a first signal at a first frequency and a second signal at a second frequency different from the first frequency toward a reflective surface through the portion of the ionosphere, wherein the first and second frequencies are in the very high frequency (VHF) range; receiving at the satellite, a reflection of the first signal and a reflection the second signal; determining a first delay of the reflection of the first signal and a second delay of the reflection of the second signal; and determining at least a first total electron content of the portion of the ionosphere based the first delay and the second delay.

Abstract: A sonar system mounted to a platform is disclosed. The sonar system includes a positioning shaft rotatably connected to the platform; a motor operably connected to the positioning shaft, wherein operation of the motor causes the positioning shaft to rotate; a transducer connected to a distal end of the positioning shaft such that rotation of the positioning shaft causes the transducer to rotate, the transducer defining an axis aligned with a sonar field projected by the transducer; and a position indicator connected to and extending from the positioning shaft to a position viewable by a user, the position indicator being aligned with the axis of the transducer to provide a visual indication to the user of a direction of the sonar field projected by the transducer.

Abstract: A method for constructing a rockbolt force inversion model based on laser scanning of a bearing plate includes: acquiring a first morphological point cloud of the bearing plate based on a laser scanner; acquiring a second morphological point cloud of the bearing plate based on the laser scanner; and constructing the rockbolt force inversion model based on a preset convolutional neural network, the first morphological point cloud, the second morphological point cloud and a rockbolt force value.

Abstract: A method for estimating the speed of a vehicle, including a scanning lidar sensor acquiring a point cloud, each point associated with an initial three-dimensional position, a time stamp, and an azimuth and elevation orientation of the line of sight of the lidar sensor. The computer processing the point cloud, including: detecting at least one object represented by a subset of points of the point cloud; determining a corrected position of a plurality of points of the object corresponding to the same azimuth or elevation value of the line of sight of the lidar sensor, the corrected positions of the plurality of points being aligned in a reference direction; and determining a relative speed between the ego-vehicle and the object, based on a difference between a corrected position and an initial position of at least one point of the object, and based on the time stamp associated with the point.

Abstract: LiDAR based memory segmentation includes obtaining a LiDAR point cloud that includes LiDAR points from a LiDAR sensor, voxelizing the LiDAR points to obtain LiDAR voxels, and encoding the LiDAR voxels to obtain encoded voxels. A LiDAR voxel memory is revised using the encoded voxels to obtain revised LiDAR voxel memory, decoding the revised LiDAR voxel memory to obtain decoded LiDAR voxel memory features. The LiDAR points are segmented using the decoded LiDAR voxel memory features to generate a segmented LiDAR point cloud.

Abstract: A LiDAR and a control method thereof, and a vehicle having the same are provided. A LiDAR for a vehicle comprises a transmitter configured to generate light and transmit the light to an object; a receiver configured to receive light reflected from the object; and a signal processor configured to detect the object by processing the light received by the receiver, and perform shot accumulation to generate one frame by accumulating a plurality of shots, wherein an additional processing is performed so that a newest shot among the plurality of shots for generating one frame is reflected with the highest importance in one frame generated by accumulating the plurality of shots.

Abstract: A ground-based node of a satellite system operates by: communicating control data with LEO navigation satellites in LEO around the earth; transmitting corrections data to the LEO navigation satellites; receiving a first collection of observations based on signaling from non-LEO navigation satellites in non-LEO around the earth, the signaling including collected observations from the non-LEO navigation satellites; receiving a second collection of observations based on navigation messages from the LEO navigation satellites, wherein the navigation messages facilitate client devices to determine their enhanced position when received in conjunction with second signaling from the non-LEO navigation satellites, and wherein the navigation messages are generated by the LEO navigation satellites in response to the corrections data; updating the corrections data based on the first collection of observations, the second collection of observations and based on telemetry data corresponding to the LEO navigation satellites

Abstract: A method for generating substitute correction data for GNSS-based localization of a mobile device is disclosed. The method includes: a) recognizing that receipt of correction data from at least one correction data source is currently impaired, b) reading of correction data that has been received earlier, and c) generating substitute correction data for the current situation by using at least part of the correction data that has been received earlier.

Abstract: A method can include and/or a system can be configured for determining satellite positioning corrections, generating a satellite positioning corrections message to transmit the satellite positioning corrections to an endpoint. The method can optionally include and/or the system can optionally be configured for establishing or determining a chain-of-trust, validating the satellite positioning corrections (e.g., at the endpoint), and/or determining a positioning solution.

Abstract: Differential global navigation satellite system (GNSS) positioning includes establishing a communicative coupling between a central computing node and a multiplicity of different roving receivers disposed within a geographic region of common atmospheric error. Each of the different roving receivers generates observable data from GNSS signals received from different ones of a selection of satellites in a GNSS constellation accessible from the geographic region of common atmospheric error. Differential GNSS additionally includes collecting the observable data from the different roving receivers in memory of the central computing node and computing a position of a specific one of the different roving receivers based upon a reduction of error determined from differencing performed upon the collected observable data from others of the different roving receivers. Finally, differential GNSS includes transmitting the computed position over the communicative coupling to the specific one of the roving receivers.

Abstract: A method for acquiring GNSS correction data comprises: receiving cell allocation information from a server, wherein the cell allocation information includes information about the coverage of the cells for allocating GNSS correction data, determining target cells corresponding to an electronic terminal according to the received cell allocation information, sending a data acquisition request for acquiring GNSS correction data corresponding to the target cells to the server, and receiving GNSS correction data sent by the server in response to the data acquisition request and corresponding to the target cells from the server. The method and device for acquiring and sending GNSS correction data according to the present disclosure can enable an electronic terminal to acquire only GNSS correction da-ta corresponding to the electronic terminal, thus improving the transmission efficiency of GNSS correction data and saving the electronic terminal's resources for processing GNSS correction data.

Abstract: A method is for detecting at least one hardware error in at least one global navigation satellite system (“GNSS”) signal transmission path of a locating system. The locating system includes at least one GNSS antenna and at least one GNSS receiver. The at least one GNSS receiver includes a programmable amplifier. An analog-to-digital converter is arranged between the programmable amplifier and a control unit. The method includes receiving a signal using the at least one GNSS antenna, and regulating the received signal using the programmable amplifier associated with the at least one GNSS receiver, such that the received signal is regulated according to a predefinable first reference value. The method also includes outputting a predetermined second reference value when no signal is present, and detecting at least one hardware error in at least one GNSS signal transmission path of the locating system when the second reference value is output.

Abstract: In general, the disclosure describes techniques for estimating a relative position of a receiver in a global navigation satellite system (GNSS) using time domain recursive filtering applied to GNSS data for an additional plurality of receivers. For example, multiple receivers each obtains GNSS data that indicates the raw position information for the receiver. A system applying techniques described herein may use the GNSS data, obtained for each receiver of the additional plurality of receivers, to improve position accuracy for a particular receiver using time domain recursive filtering.

Abstract: A positioning method of the present disclosure includes: generating first observation data through observation of phases of a plurality of carrier waves transmitted from a plurality of transmitting stations in a first satellite; generating second observation data through observation of the phases of the plurality of the carrier waves in a second satellite; performing phase difference calculation to calculate a phase difference of the plurality of the carrier waves observed in the first satellite and the second satellite using the first observation data and the second observation data; performing base line vector calculation to calculate a base line vector indicating relative positions of the first satellite and the second satellite based on the phase difference calculated by performing the phase difference calculation; and performing the phase difference calculation and the base line vector calculation by either one of the second satellite or a positioning apparatus located on the ground.

Abstract: Methods and apparatus for providing high-precision spatiotemporal identifier services are presented. These include repeatedly receiving low-precision client positions from clients; receiving an area of interest from a search client; identifying candidate clients using low-precision client positions within the area of interest and surrounding areas according to predetermined criteria; confirming high-precision spatiotemporal identifiers with the candidate clients; and confirming, with the search client, one or more target clients among the candidate clients using the high-precision spatiotemporal identifiers. These enable one person to communicate with another person at a specific location (area) without knowing or revealing any personal information.

Abstract: An electronic device, including a sensing substrate, a scintillator layer, and an adjustable reflective layer, is provided. The scintillator layer is disposed on the sensing substrate. The adjustable reflective layer is disposed on the sensing substrate and includes a first electrode, a second electrode, and an electrophoretic layer. The first electrode is disposed on the scintillator layer. The second electrode is disposed on the first electrode. The electrophoretic layer is disposed between the first electrode and the second electrode. The second electrode surrounds the scintillator layer.

Abstract: A particle beam microscope comprises: a particle beam source for generating a particle beam; an objective lens for focusing the particle beam in an object plane; a first scintillator for converting electrons into light; a second scintillator for generating light by way of electrons; and light detectors for detecting the generated light. The distance of second scintillator from the object plane is greater than the distance of the first scintillator from the object plane. The second scintillator has a surface which faces the object plane and through which electrons arriving from the object plane pass. The electrons are converted into light by the second scintillator. The light generated by the first scintillator and detected by a light detector is incident on the second scintillator.

Abstract: The present disclosure provides a photoelectric detector and an electronic device. The photoelectric detector has a pixel region and a peripheral region surrounding the pixel region, includes a base substrate and a plurality of pixel units arranged on the base substrate and positioned in the pixel region; each pixel unit includes a thin film transistor, a photodiode and a storage capacitor; for each pixel unit, a first electrode of the thin film transistor is connected with a first electrode of the photodiode and a first electrode plate of the storage capacitor, a second electrode of the photodiode is connected with a first bias signal line, a second electrode plate of the storage capacitor is connected with a second bias signal line, the first bias signal line is electrically connected with the second bias signal line at a connection node located in the peripheral region.

Abstract: A radiation detection apparatus includes: a radiation detector that detects radiations; a conductive base that supports the radiation detector; a circuit board that includes a first ground electrode and a second ground electrode different from the first ground electrode, and processes a signal read from the radiation detector, and an insulating member that blocks electrical connection between the second ground electrode and the base.

Abstract: A radiation detection apparatus according to the present invention includes: a direct-detection-type radiation detector provided in plurality and configured to be arranged in a planar manner; and a semiconductor integrated circuit configured to perform a control operation of the radiation detector or processing on a signal from the radiation detector, wherein the semiconductor integrated circuit is disposed on a back side of the light-receiving surface so as to be included within an area of the radiation detector in a plan view viewed from a side of a light-receiving surface of the radiation detector.

Abstract: Detector systems are provided. The detector system may include a plurality of edge-on detector modules. Each edge-on detector module may include: a silicon substrate including a front side corresponding to a first side of the each edge-on detector module and a rear side corresponding to a second side of the each edge-on detector module; a plurality of detection elements disposed on the front side of the silicon substrate; a backside electrode disposed on the rear side of the silicon substrate; and/or an anti-scatter structure disposed on at least one of the first side or the second side of the each edge-on detector module, the anti-scatter structure being configured to prevent or reduce scattering of photons emitted into the silicon substrate. The silicon substrate, the plurality of detection elements, the backside electrode, and/or the anti-scatter structure may be configured as an integral piece.

Abstract: A radiation detector obtained by arranging a plurality of pixels on a semiconductor substrate configured to convert incident radiation into charges is provided. The plurality of pixels comprise a plurality of first pixels, and a plurality of second pixels arranged along an outer edge of the semiconductor substrate. Each of the plurality of second pixels has output sensitivity higher than output sensitivity of each of the plurality of first pixels. An interval between adjacent second pixels among the plurality of second pixels is smaller than an interval between adjacent first pixels among the plurality of first pixels.

Abstract: Some embodiments include an imaging system comprising a detector substrate, at least one detector circuit comprising a capacitor coupled with the detector substrate, the capacitor arranged to collect an electrical charge from the detector substrate, and the imaging system further comprises at least one programmable current source, arranged to provide a neutralizing charge to the capacitor, and the imaging system is configured to select a value for the neutralizing charge in dependence of a frame number.

Abstract: A method of calibrating a pixelated radiation detector containing a plurality of pixel detectors electrically connected to a plurality of respective read-out channels of detector read-out circuitry includes determining a sensor material deadtime, ?sensor, for each of the plurality of pixel detectors, and adjusting the respective read-out channel deadtime, ?ASIC, based on the determined sensor material deadtime, ?sensor, of the respective one of the plurality of pixel detectors, such that a total deadtime, ?total of each pixel detector including a sum of the respective sensor material deadtime, ?sensor, and the respective read-out channel deadtime, ?ASIC, varies by less than ±5% from each other.

Abstract: A detector unit for a PET imaging system is disclosed that includes a gantry having a patient-receiving tunnel, where the detector unit includes a plurality of detector elements in a helical arrangement around an axial axis of the PET imaging system.

Abstract: A method includes accumulating counts for each pixel in a set of pixels of one or more gamma cameras of a SPECT imaging system from a plurality of imaging examinations and each energy peak of each isotope used in the plurality of imaging examinations to produce an energy spectrum for each of the pixels at each of the energy peaks of each of the isotopes, determining, for the pixels and for the energy peaks, an energy calibration factor that converts an energy detected by each of the pixels to an energy of a corresponding energy peak and populating an energy map with the factors, and determining, for the pixels and for the energy peaks, a uniformity calibration factor that converts a number of counts detected by each of the pixels to a predetermined number of counts for a corresponding energy peak and populating a uniformity map with the factors.

Abstract: A seismic monitoring system, including a fiber optic cable defining a central axis and including an axial optical fiber disposed along the central axis, and three helical optical fibers disposed helically around the central axis, said three helical optical fibers being equidistantly spaced apart, a strain sensing unit configured to measure axial strain distribution in the axial optical fiber and in the three helical optical fibers, and a processing server configured to calculate, from the measured axial strain distribution in the axial optical fiber and in the three helical optical fibers, axial strain distribution in the fiber optic cable, pressure distribution in the fiber optic cable, bending distribution in the fiber optic cable in a first direction, and bending distribution in the fiber optic cable in a second direction perpendicular to the first direction.

Abstract: Methods and systems for determining a geological structural style of a subterranean formation include acquiring seismic reflection measurements of the subterranean formation; isolating one or more signals in the acquired measurements, the one or more signals having larger amplitudes relative to one or more other signals in the acquired measurements; obtaining a set of structural geology geometric primitives wherein each structural geology geometric primitive comprises geometric data representing a known structural geological style; identifying at least one best fit between a set of the one or more isolated signals and a structural geology geometric primitive from the set of structural geology geometric primitives; determining a degree of confidence for at least one best fit identified; and determining a geological structural style of the subterranean formation based on the identified at least one best fit and based on the determined degree of confidence for that best fit.

Abstract: The invention relates to a method for obtaining a physical property of a subsurface volume of a hydrocarbon reservoir over time comprising a fluid, carried out by a system and comprising the following steps: obtaining observed data representative of a fluid saturation in said volume over time, mapping a location of an observed fluid front from the observed data, obtaining simulated data representative of the fluid saturation in said volume over time using a reservoir model, mapping a location of a simulated fluid front from the simulated data, obtaining simulated fluid flow streamlines in said volume over time from a flow simulator, computing and minimizing a cost function representing a mismatch between the observed and simulated data by calculating a shortest distance among distances along corresponding simulated streamlines, obtaining said physical property.

Abstract: A method (600) and a system (1000) for generating an adaptive migration taper for a pre-stack seismic dataset are disclosed. The method (600) includes obtaining the pre-stack seismic dataset (602) and a seismic velocity model of a subterranean region (604). The method (600) also includes generating the adaptive migration taper based, at least in part, on the pre-stack seismic dataset (606), and forming a migrated seismic image using a migration function, the seismic velocity model, the pre-stack seismic dataset, and the adaptive migration taper (608). The method (600) further includes determining a location of a hydrocarbon reservoir based, at least in part, on the migrated seismic image (610).

Abstract: In certain embodiments, a system includes a processor and a memory storing machine readable instructions executable by the processor, the machine readable instructions including a seismic image analysis tool having a wavelet packet transformer to generate sub-images of a received seismic image, a sub-image filter to perform noise suppression and edge detection on each sub-image, an inverse wavelet packet transformer to reconstruct higher level sub-images or seismic image from filtered sub-images, and a sub-image merger to recursively merge a sub-image and a reconstructed sub-image.

Abstract: Methods for operating a metal detector that includes a balanced coil system with a transmitter coil connected to a transmitter unit and first and second receiver coils connected to an input of a receiver unit. The transmitter unit includes a transmitter signal path for which a transmitter signal with at least one fixed or selectable operating frequency and a related quadrature signal are provided. The transmitter signal is applied to an input of a transmitter amplifier that forwards the amplified transmitter signal directly or via a transmitter matching unit to the transmitter coil.