Abstract: Determining a mobile device's location, includes receiving, by the mobile device, a first packet from a first access point and generating a first time-stamp representing the first packet's arrival time; receiving, by the mobile device, a second packet from a second access point and generating a second time-stamp representing the second packet's arrival time; using these to determine the difference between the arrival times of the first and second packet at the mobile device; receiving, by the mobile device, first information representative of the first packet transmission time and second information representative of the second packet transmission time, the first and second information used to find the interval between the transmission of the first and second packets from the first and second access points respectively; determining, by the mobile device, the difference between the flight-times of the first and second packets to the mobile device; and determining, by the mobile device, the difference between t

Abstract: A radar system for transmitting a FMCW radar sensor signal encompassing a series of frequency modulation ramps and phase-modulated with a first code sequence orthogonal to a respective other code sequence with which a time-synchronized transmitted signal of another FMCW radar sensor is phase-modulated; the radar echoes are phase-demodulated with a code sequence correlating with the first code sequence; and a distance and/or a relative speed of a localized object is identified from a Fourier analysis frequency spectrum, in a first dimension over sampled radar echo values of a frequency modulation ramp, and in a second dimension over the phase-demodulated sequence of radar echoes of the ramps of the transmitted signal; and a vehicle fleet radar system having an FMCW radar sensor in which a code set satisfying a code set orthogonality condition with a code set of a radar sensor of another vehicle is used for phase modulation/demodulation.

Abstract: The disclosure provides a radar apparatus. The radar apparatus includes a transmit unit that generates a first signal in response to a reference clock and a feedback clock. The first signal is scattered by one or more obstacles to generate a second signal. A receive unit receives the second signal and generates N samples corresponding to the second signal. N is an integer. A conditioning circuit is coupled to the transmit unit and the receive unit. The conditioning circuit receives the N samples corresponding to the second signal, and generates N new samples using an error between the feedback clock and the reference clock.

Abstract: A radar apparatus comprises a signal transmission unit, a signal reception unit, a determination unit, and a target detection unit. The signal transmission unit transmits a transmission signal for detecting a target object. The signal reception unit receives a reception signal generated when the transmission signal is reflected. The determination unit determines a presence of a clutter structure using frequency response information of the reception signal. The target detection unit detects a target object by correcting a detection threshold value for detecting a target object according to the determination result on the presence of the clutter structure and detects a target object.

Abstract: A TOF (time of flight) type distance measuring system of high accuracy is provided.

Abstract: In accordance with certain embodiments of the present technology, edges of light drive pulses, which are produced by a light source driver and are used to drive a light source, are aligned with edges of light reference pulses that have a predetermined fixed delay relative to light timing pulses. This way, light pulses are emitted by the light source at precisely known times, so that accurate time-of-flight (TOF) measurements can be made. Additionally, edges of shutter drive pulses, which are produced by a shutter driver and are used to drive a gated light detector, are aligned with edges of shutter reference pulses that have a predetermined fixed delay relative to shutter timing pulses. This way, the gated light detector is shuttered on at precisely known times, so that accurate TOF measurements can be made.

Abstract: A LIDAR system emits laser pulses, wherein each pulse is associated with a power level. A laser emitter is adjusted during operation of a LIDAR system using power profile data associated with the laser. The power profile data is obtained during a calibration procedure and includes information that associates charge duration for a laser power supply with the actual power output by laser. The power profiles can be used during operation of the LIDAR system. A laser pulse can be emitted, the reflected light from the pulse received and analyzed, and the power of the next pulse can be adjusted based on a lookup within the power profile for the laser. For instance, if the power returned from a pulse is too high (e.g., above some specified threshold), the power of the next pulse is reduced to a specific value based on the power profile.

Abstract: A system uses range and Doppler velocity measurements from a lidar subsystem and images from a video subsystem to estimate a six degree-of-freedom trajectory of a target. The video subsystem and the lidar subsystem may be aligned with one another by mapping the measurements of various facial features obtained by each of the subsystems to one another.

Abstract: An ultrasound imaging system includes a beam receiving circuit and a back-end circuit. The beam receiving circuit receives a plurality of digitized echo signals. The back-end circuit is coupled to the beam receiving circuit for outputting a plurality of compressed delay timing parameters corresponding to a plurality of channels to the beam receiving circuit. The beam receiving circuit decompresses the compressed delay timing parameters into a plurality of delay timing parameters, and processes the digitized echo signals into an ultrasound beamforming value according to the delay timing parameters corresponding to the channels. The back-end circuit synthesizes an ultrasound image according to the ultrasound beamforming value outputted from the beam receiving circuit.

Abstract: An acoustic window for passage of desired acoustic waveforms therethrough is provided. The acoustic window includes at least a pair of structural septa. At least one core layer is sandwiched between the septa and includes a cellular reinforcement and transmission medium encapsulating the cellular reinforcement. The acoustic window may be included on the hull of a surface or submergible vessel, in order to provide a hydrodynamic fairing over sonar or other acoustic equipment.

Abstract: A method of measuring the height of a rotorcraft above the ground by means of a radioaltimeter having plane antennas, and it also provides to such a radioaltimeter and a rotorcraft fitted with such a radioaltimeter. The rotorcraft is provided with sling equipment for transporting a load swinging under the rotorcraft in a given field of mobility, and a lens modifies the basic field of view of the radioaltimeter as supplied by the antennas between firstly a limited field of view for the radioaltimeter excluding the field of mobility of the load transported by the sling equipment from the field of view of the radioaltimeter, and secondly an optimum field of view of the radioaltimeter of scope that is optimized in the event that no load is being transported by the sling equipment.

Abstract: A radar device comprises a transmitter, a receiver, a first radar image production component, a second radar image production component, a display component, and an echo width adjuster. The transmitter transmits a pulse signal. The receiver receives an echo signal during a transmission and reception period of the pulse signal. The first radar image production component produces a radar image of a first display range on the basis of the echo signal. The second radar image production component produces a radar image of a second display range that is wider than the first display range on the basis of the echo signal. The display component selectively or simultaneously displays the radar image of the first display range and the radar image of the second display range. The echo width adjuster adjusts pulse width of echo included in the radar images or the echo signal according to the display range of the radar image.

Abstract: A radar apparatus is provided. The radar apparatus includes a transmission and reception unit configured to transmit a close distance pulse signal, a medium distance pulse signal, and a far distance pulse signal in an order of the close distance pulse signal, the far distance pulse signal, the medium distance pulse signal, and then the far distance pulse signal, and receive reflection waves of the transmitted pulse signals, the far distance pulse signal having a wider pulse width than the close distance pulse signal, the medium distance pulse signal having a pulse width wider than the close distance pulse signal and narrower than the far distance pulse signal, and a signal processor configured to generate a radar image by using a first detection result and a second detection result.

Abstract: A single antenna has directionality, transmits a transmission wave toward a golf ball on the basis of a supplied transmission signal, receives a reflected wave that is reflected off the golf ball, and generates a reception signal. A Doppler sensor generates as time series data a Doppler signal having a Doppler frequency. A measurement processing unit calculates a movement direction of a mobile body on the basis of the correlation between the movement direction of the mobile body and the differential between the velocity of a mobile body for a reference time measurement obtained in advance and the velocity of the mobile body after a prescribed amount of time has elapsed from the reference time.

Abstract: A method for virtual aperture array radar tracking includes: transmitting first and second probe signals; receiving a first reflected probe signal at a radar array; receiving a second reflected probe signal at the radar array; calculating a target range from at least one of the first and second reflected probe signals; corresponding signal instances of the first reflected probe signal to physical receiver elements of the radar array; corresponding signal instances of the second reflected probe signal to virtual elements of the radar array; calculating a first target angle by performing beamforming from the signal instances of the first and second reflected probe signals; and calculating a position of the tracking target relative to the radar array from the target range and first target angle.

Abstract: A target tracking device transmits a radio frequency beam towards a scene, detects backscatter comprising at least a portion of the RF beam reflected from a reflecting object at the scene, and performs operations that include determining whether the reflecting object is a tracking target, determining a position of the tracking target, and generating tracking information indicative of a position adjustment for maintaining an alignment of the target tracking device and the tracking target. A target tracking method includes transmitting a millimeter wavelength beam in a direction of orientation of a camera, detecting backscatter reflected from a reflecting object, determining whether the reflecting object is a tracking target, and determining a position of the tracking target. If a distance to the tracking target has increased from a prior distance, tracking information indicative of a position adjustment for offsetting the increase in distance may be generated.

Abstract: A system and related method is disclosed for determining a range between a single antenna array and a surface. The system includes a source generator configured to generate a source signal, a coupler, a circulator, a mixer, and a digital signal processor. The source generator generates a frequency modulated continuous wave source signal. The coupler splits the source signal into a transmission signal and a coupled signal. The circulator receives the transmission signal from the coupler, outputs the transmission signal to an antenna, and receives a reception signal from the antenna, which may be a reflection of the transmission signal from the surface. The mixer mixes the reception signal from the circulator and the coupled signal from the coupler to generate a low frequency return signal. The digital signal processor determines a range between the antenna and the surface based on the low frequency return signal.

Abstract: In a radar assembly, a first dielectric member includes a dielectric outermost structural member of a vehicle. A radar device includes an antenna module, and a substantially tubular or domed radome. The radome includes a transmissive portion, and is disposed to cover the antenna module such that the transmitted radar wave passes through the transmissive portion. The transmissive portion is disposed behind the back surface of the first dielectric member with space thereto. A second dielectric member includes at least the transmissive portion, and is disposed to face the first dielectric member. A frequency-selective substrate passes a radar wave within a frequency band therethrough, and block radar waves outside the frequency band. The frequency-selective substrate is disposed such that its first surface is directly abutted onto the first dielectric member, and its second surface is directly abutted onto the second dielectric member to constitute a sandwich structure.

Abstract: Systems, methods, and devices for processing a radar return signal to estimate reflectivity values. An example weather radar system includes one or more antennas configured to transmit a radar signal generated by a transmitter and deliver a radar return signal to a receiver. The example weather radar system further includes one or more processors configured to sample the radar return signal, determine a first signal power measurement of the sampled radar return signal based on Doppler signal processing, determine a quality of the first signal power measurement, and estimate reflectivity values of the sampled radar return signal based on the first signal power measurement when the quality is above a threshold. The example weather radar system further includes memory configured to store the estimated reflectivity values.

Abstract: A method comprising: receiving, by an electronic device, a first signal having a first frequency; identifying, by the electronic device, at least one of a strength of the first signal or a signal-to-noise ratio of the first signal; outputting, by the electronic device, a second signal having a second frequency that is different from the first frequency, the second signal being output based on at least one of the strength of the first signal or the signal-to-noise ratio of the first signal; receiving the second signal by the electronic device; and detecting whether the electronic device is at least partially immersed in a liquid based on the received second signal.

Abstract: To evaluate the resolution of individual sonar images in field conditions without specific targets, a statistical sampling of the imagery is taken and analyzed. Large quantities of resolution measurements are made on point-objects identified in the imagery. The measurements are compared to improve fidelity and generate statistically significant results. The image is broken into segments for analysis to identify variation in resolution across the image. The mean value of point-target resolution per segment can be determined for the imagery. A segment with an insufficient number of measurements required to determine a statistically significant value for resolution is rejected. The image resolution can be determined as the mean or median value of the segment measurements for the entire image.

Abstract: An object information acquisition apparatus according to an embodiment of the present invention includes a plurality of transducer elements each configured to transmit an acoustic wave to an object, to receive reflected waves reflected from inside the object, and to convert the reflected waves into a time-series reception signal; and a processor configured to perform frequency domain interferometry combined with adaptive signal processing by using the reception signals output from the plurality of transducer elements and a reference signal so as to obtain acoustic characteristics at a plurality of positions located inside the object. The processor is configured to switch the reference signal to another reference signal at least once in accordance with a target position located inside the object while performing the frequency domain interferometry so as to obtain the acoustic characteristics at the plurality of positions located inside the object.

Abstract: Methods and systems for performing three dimensional LIDAR measurements with different pulse repetition patterns are described herein. Each repetitive pattern is a sequence of measurement pulses that repeat over time. In one aspect, the repetition pattern of a pulsed beam of illumination light emitted from a LIDAR system is varied to reduce total energy consumption and heat generated by the LIDAR system. In some examples, the repetitive pattern is varied by skipping a number of pulses. In some examples, the repetitive pattern of pulses of illumination light emitted from the LIDAR system is varied by changing a repetition rate of the sequence of emitted pulses. In some examples, the pulse repetition pattern is varied based on the orientation of the LIDAR device. In some examples, the repetition pattern is varied based on an object detected by the LIDAR device or another imaging system.

Abstract: A device for surveying interior spaces and architectural features, which is adapted to be placed in environments for laying out the plan of such environments. The device includes an instrument for sensing the distance of a predetermined point relative to the position of the device, such as a laser distance meter or the like, there being provided a system that senses the rotation of such device. There are also provided an electronic control unit and a power supply and generation source, such as a battery or the like, for powering such device. The present invention also relates to a method of laying out and reconstructing plans of interior environments.

Abstract: According to an embodiment, a distance measuring device includes a light source, a reflection device, a first photodetector and a calculation unit. The reflection device includes a reflection surface configured to scan an object to be measured with light by reflecting the light, and configured to reflect scattered light of the light scattered on the object to be measured. The first photodetector detects the scattered light. The calculation unit calculates a distance from the reflection surface to each of positions on the object to be measured based on a detection result of the first photodetector. The first photodetector includes a photoelectric conversion element including a plurality of detection regions each having different detection sensitivity of the light. The detection regions are arranged in order according to an incident position of the scattered light from the object to be measured at each of positions having the different distance.

Abstract: The invention provides a posture detecting device, which comprises a tilt detecting unit as rotatably supported around two shafts perpendicular each other to an outer frame and for detecting a tilting from the horizontal, encoders provided on each of the shafts, motors provided so as to rotate each shaft, and a first arithmetic processing unit for driving/controlling the motor based on a detection result from the tilt detecting unit, wherein the first arithmetic processing unit drives the motors so that the tilt detecting unit detects the horizontal based on a signal from the tilt detecting unit when the outer frame is tilted and calculates a posture of the outer frame based on outputs of the encoders when the tilt detecting unit detects the horizontal.

Abstract: A method and device for determining position coordinates of a target object is disclosed. The method includes positioning a target device on the target object, transmitting a laser beam onto the target device, reflecting the laser beam off of the target device, recording an image of the target device by a camera device with the reflected laser beam as a light reflection in the image, and determining a focus of the light reflection in the image. The reflected laser beam is received and a distance to the target object is calculated from the received beam. A first offset is calculated from a focal length of the camera device, the calculated distance to the target object, and a first image coordinate of the focus of the light reflection in the image. The position coordinates of the target object are calculated from the distance and the first offset.

Abstract: Some embodiments of the invention relate to a laser tracker for continuously tracking a reflective target and for determining the position of the target, comprising a base that defines a vertical axis and a beam-deflecting unit for emitting measurement radiation. The beam-deflecting unit can be pivoted about the vertical axis and a tilt axis in relation to the base in a motorized manner and a measurement axis is defined by an emission direction of the measurement radiation. The laser tracker may have a fine distance measurement unit for precisely determining a distance to the target, an angle measurement functionality for determining an orientation of the beam-deflecting unit in relation to the base, and a target-seeking unit. The target-seeking unit has illuminating means, a camera having a position-sensitive detector for detecting illumination radiation reflected by the target, and a control and evaluating unit having seeking functionality for finding the target.

Abstract: A distance-measuring imaging device includes: a drive control unit; a light source unit; an image processing unit including light receiving units and charge reading units arranged one-to-one; and an image processing unit. The charge reading units are arranged partly at the left side of corresponding ones of the light receiving units and partly at the right side of corresponding ones of the same. In each of a period in which the exposure is performed when the exposure control signal is received after a first delay time since when the light emission control signal is received and a period in which the exposure is performed when the exposure control signal is received after a second delay time longer than the first delay time, since when the light emission control signal is received, the left-side charge reading units read charge leftward, and the right-side charge reading units read charge rightward.

Abstract: The invention relates to a scanning opto-electronic detection device and a method for sensing the surroundings of a motor vehicle 1 by scanning by means of an opto-electronic detection device 2. The detection device 2 comprises a transmission and reception optical system 4 that outputs electromagnetic rays and maps reflected rays on a detector, wherein the detector is of multiline design and comprises a plurality of detector cells for providing electrical received signals on the basis of received reflected rays, which detector cells are lined up in a detector cell stack and are evaluable in parallel measurement planes. The detection device furthermore comprises a mirror carrier 7 having mirror faces 9, 10 that are averted from one another and that are arranged in a manner tilted at a tilt angle with respect to an axis of rotation 8 of the mirror carrier 7 and map different vertical sensing regions for reflected rays onto the detector.

Abstract: A fleet of small spacecraft (“cells”) in low Earth orbit combine to form an integrated Earth observing system providing many observations previously requiring distinct sensing systems. Each cell performs a few relatively primitive functions, including emission, reception, sampling, and recording of radio and microwave signals. Each cell observes over a spherical field of view, samples the received signals independently at many small antenna elements, and stores the data from each element. Data from all cells are sent to a common location where they can be combined in diverse ways to realize a wide range of observing functions. These functions may include ionosphere and gravity field mapping; atmospheric radio occultation; ocean, ice, and land altimetry; ocean scatterometry; synthetic aperture radar (SAR) imaging; radar sensing of soil moisture, land cover, and geological surface properties; and interferometric SAR sensing of surface change.

Abstract: A method for expanding a graph includes receiving GPS data points for a GPS track associated with the graph. The graph includes a plurality of nodes and a plurality of connections between the nodes. The GPS data points are mapped to the graph by determining an activity track based on the GPS track, the activity track including a plurality of nodes from the graph and at least one connection between the nodes. The method further includes determining that the activity track includes an unidentified connection that is not included on the graph. Thereafter, a determination is made whether the unidentified connection should be included in the graph. If it is determined that the unidentified connection should be included as a connection in the graph, the graph is amended to include the unidentified connection.

Abstract: This disclosure is directed to systems and methods for producing a target map for a computing device, such as a mobile device. A set of golf shot data may be obtained and may include shot location data from a plurality of users and associated with a hole on a golf course. A geographic region may be determined based on the shot location data. A subset of target locations may be calculated using a target score and the shot location data of the set of golf shot data. In some cases, the target score is par. A target map may be produced using the subset of target locations. A visual indicia of the target map may be displayed with an image depicting at least a portion of the hole on the golf course.

Abstract: A multi-band satellite navigation receiver for carrier and code tracking using a fixed point sigma rho filter with improved stability is described. The receiver simplifies and speeds up the data processing in the filter to adaptively accommodate common information from aggregate bands and obtain the accurate position of the receiver in real time. The filter may utilize a standard deviation function and a cross correlation function while determining adaptive scale factors to ensure that the filter is stable and reliable.

Abstract: Method for precise GNSS positioning system with improved ambiguity estimation. The method is based on the realization that, especially during convergence, the estimated float ambiguities are biased when estimated simultaneously with the ionosphere parameters. The “ionosphere-like” biases can be separated from the actual float ambiguities by using the fixed wide-lane (or extra wide-lane) integer ambiguities. The original real-valued ambiguities (e.g., one of L1, L2 and L5 in the GPS case) are corrected using the corresponding biases, resulting in reliable float ambiguities that are taken as input in the next processing step.

Abstract: A terminal receives a GPS signal and a GPS correction signal, and a first elevation value calculation unit calculates an elevation value from the GPS signal and the GPS correction signal. The terminal includes an atmospheric pressure information detection unit that detects ambient atmospheric pressure information, and a second elevation value calculation unit for calculating an elevation value from the atmospheric pressure information. If a GPS correction signal can be received, the elevation value calculated by the first elevation value calculation unit is used as the elevation value of the current position and the calculated elevation value is used to calibrate the second elevation value calculation unit. If a GPS correction signal cannot be received, the elevation value calculated by the calibrated second elevation value calculation unit is used as the elevation value of the current position to acquire an accurate elevation value even when inside a building or tunnel.

Abstract: A radiation-detecting device including at least two radiation detectors distributed in series along a support cable, each detector including an optically stimulated luminescence detection element which is optically coupled to at least one optical fiber, each optically stimulated luminescence detection element being held opposite a first end of the optical fiber by a mechanical part fixed to the support cable, the mechanical part being held in a flexible cable by a holding mechanism, second ends of each optical fiber leading to the same first end of the flexible cable.

Abstract: A centroid contact radiation detector system/method providing for low capacitance and noise insensitivity is disclosed. The system incorporates a P-type/N-type bulk germanium volume (PGEV/NGEV) having an internal well cavity void (IWCV). The external NGEV surfaces incorporate an N+/P+ electrode and the surface of the IWCV incorporates a centrally located P+/N+ contact (CPPC). The IWCV surface is constructed and the CPPC is positioned within the IWCV so as to provide uniform symmetric field distribution within the PGEV/NGEV and improved noise immunity. The CPPC may be formed using point, reduced-area, medium-area, large-area, hemispherical, semi-hemispherical, and cylindrical annulus contact constructions. The PGEV/NGEV may be constructed using cylindrical, regular polyhedral, or spherical forms.

Abstract: There is provided an x-ray detector including a number of adjacent detector modules arranged in a configuration having central parts and peripheral parts. The x-ray detector is configured to have higher dose efficiency in the central parts and lower dose efficiency in the peripheral parts.

Abstract: An imaging detector module (112) of an imaging system includes at least one detector pixel (114) and self-diagnosing circuitry (116). The self-diagnosing circuitry includes a microprocessor (202) and at least measurement device (210). The microprocessor controls the at least measurement device to measure at least one parameter of the at least one detector pixel, wherein a value of the at least one parameter is indicative of a health state of the imaging system. A method includes employing self-diagnosing circuitry embedded in an imaging detector module to measure at least one parameter of at least one detector pixel of the imaging detector module. A value of the at least one parameter is indicative of a health state of the imaging detector. The method further includes generating, with the self diagnosing circuitry, a signal indicating a health state of the imaging detector module based on the measured at least one parameter.

Abstract: Methods, systems, and computer-readable mediums are provided that determine the angular orientation of detectors and detector electronic assemblies (“DEAs”). In various embodiments, the orientation of detectors/DEAs (in the ring) is determined with respect to other detectors/DEAs in the ring, the orientation of the detectors/DEAs with respect to a patient bed, or the orientation of the detectors/DEAs with respect to Earth's gravitational field. In another embodiment, a nuclear medical imaging system has one or more detector units arranged around or that can be swept around a patient bed. Each of the detector units includes an angular orientation-sensing accelerometer. By determining angular orientation of the detector from signals outputted by the accelerometer, the circumferential position of the detector relative to the patient bed can be determined. That information is used in conjunction with information about detected events to construct an image of an organ or tissue mass of interest.

Abstract: A self-stabilizing scintillation detector system for the measurement of nuclear radiation, preferably gamma radiation, is provided, the system comprising a scintillation crystal, a photo detector, a photomultiplier (PMT) with n dynodes and an evaluation system connected to the output port of the PMT, i.e. the anode of the PMT, the PMT comprising at least two connections to at least two different dynodes of the PMT, a device for measuring the electric current at the at least two dynodes, as well as an electronic device for determining the quotient of the measured at least two electric currents at the at least two dynodes, said quotient being a measure for the gain between the two dynodes, further comprising means for comparing the measured quotient with a reference value, and means for adjusting the gain of the PMT by utilizing the gain change over time.

Abstract: A system and method for discontinuous spectrum emission in seismic exploration is disclosed. The method may include determining a minimum frequency to be emitted by a seismic source in a frequency spectrum. The method may further include selecting a maximum frequency to be emitted by the seismic source in the frequency spectrum. The method may include identifying a portion of the spectrum between the minimum frequency and the maximum frequency where a reduced signal will be emitted by the seismic source. The method may finally include emitting, by the seismic source, a seismic signal according to the frequency spectrum and the identified portion of the frequency spectrum with the reduced signal.

Abstract: A seismic sensor device includes an elongated housing for placement at least partially into an earth surface. A plurality of particle motion sensors are contained in the elongated housing to measure translational data in a first direction, where plural pairs of the particle motion sensors are spaced apart along a second, different direction along a longitudinal axis of the elongated housing. A communication interface communicates the measured translational data to a computer system configured to compute a gradient based on respective differences of the measured translational data of the corresponding plural pairs of the particle motion sensors, and compute one or more of rotation data and divergence data using the gradient.

Abstract: Method for determining visualization rendering parameters for seismic data to heighten subtle differences. The full data volume and at least one sub-volume are processed in the inventive method (12). Statistics are extracted for the data or attributes of the data (13). Rendering parameters are derived based on comparing and computing the statistical information for the volume and sub-volumes (14).

Abstract: The present disclosure is directed to a helical conveyor for underwater seismic exploration. The system can include a case having a cylindrical portion. A cap is positioned adjacent to a first end of the case. A conveyor having a helix structure is provided within the case. The conveyor can receive an ocean bottom seismometer (“OBS”) unit at a first end of the conveyer and transport the OBS unit via the helix structure to a second end of the conveyor to provide the OBS unit on the seabed to acquire the seismic data. The system can include a propulsion system to receive an instruction and, responsive to the instruction, facilitate movement of the case.

Abstract: Example implementations may relate to accurate pallet insertion. An example system may include a forklifted configured with a base and a tine coupled to the base. The tine may include a first proximity sensor positioned on a first side of the tine and a second proximity sensor positioned on a second side of the tine. The system may also include a computing system configured to receive, from the first sensor and the second sensor, sensor data indicative of proximity of the tine relative to opposing surfaces of a pocket of a pallet and navigate the forklift relative to the pallet based on the sensor data.

Abstract: An antenna assembly includes a tool mandrel having a tool axis, and a coil including a plurality of windings wrapped about the tool mandrel at a winding angle offset from the tool axis. A soft magnetic band radially interposes the coil and the tool mandrel and extends about a circumference of the tool mandrel at a band angle orthogonal to the winding angle. The soft magnetic band includes a plurality of inserts, and a gap is defined between each laterally adjacent insert and the gap extends parallel to the tool axis.

Abstract: Example computer-implemented methods, computer-readable media, and computer systems are described for accurate localization of wireless sensor devices in underground oil reservoirs. In some aspects, every sensor measures respective received magnetic field strengths (RMFSs) on a plurality of respective magnetic induction (MI) links and transmits the measured respective RMFSs to at least one anchor devices. A set of distances is determined from the measured respective RMFSs. The set of distances is processed through an ordered sequence of algorithms, namely weighted maximum likelihood estimation (WMLE), semi-definite programming (SDP) relaxation, alternating direction augmented Lagrangian method (ADM), and conjugate gradient algorithm (CGA), to generate accurate localization of the wireless sensor devices in underground oil reservoirs.

Abstract: NMR properties of earth formations are determined using a logging device movable in a borehole. The logging device includes a magnet assembly to generate a static magnetic field and an antenna expandable from the surface of the magnet assembly into the borehole toward the borehole wall to increase the magnetic dipole moment of the antenna. The logging device can be lowered or raised through a drill pipe with the magnet assembly being configured to generate no magnetic field while the device is conveyed within the drill pipe. The logging device may also include a side-looking sensor to acquire fast relaxation component of the NMR signals.