Abstract: A magnet unit for a magnetic resonance apparatus has a superconducting basic field magnet, a vacuum vessel, within which the superconducting basic field magnet is situated, and a cylindrical magnet housing. The magnet housing has a housing surface having a first sub-area and a second sub-area, with the first sub-area inwardly offset from the outside, in the direction of a longitudinal extent of the magnet unit, in relation to the second sub-area.

Abstract: In a method and magnetic resonance apparatus for determining a scanning region that is relevant to a magnetic resonance examination, overview data are acquired from an object positioned on a patient accommodation device during total imaging, the overview data are evaluated so as to generate position information therefrom relating to the object positioned on the patient accommodation device on the basis of the overview data, and the scanning region that is relevant to the magnetic resonance examination is determined on the basis of the position information.

Abstract: According to at least one of embodiments, a magnetic resonance imaging apparatus includes an RF coil equipped with a plurality of coil elements and processing circuitry configured to determine a risk of generating artifact caused by mixture of a magnetic resonance signal outside an imaging region of an object, based on imaging conditions and to select at least one coil element used for generating an image of the object from the plurality of coil elements, based on a result of determination of the risk of generating artifact.

Abstract: A 3D parallel imaging method includes the steps of acquiring a partial CPMG data set, acquiring a partial CP data set, and interleaving the partial CPMG data set and the partial CP data set at different ky-kz locations.

Abstract: The present invention provides an apparatus and method for controlling a pulse sequence of a magnetic resonance (MR) imaging system, the MR imaging system comprising a radio frequency magnetic field coil and a gradient magnetic field coil, the apparatus for controlling a pulse sequence of the MR imaging system comprising a radio frequency driving unit and a gradient driving unit. The gradient driving unit is used for applying a first motion probing gradient (MPG) pulse and a second MPG pulse to the gradient magnetic field coil successively.

Abstract: A method for magnetic resonance (MR) phase imaging of a subject includes: (i) for each channel of a multi-channel MRI scanner, acquiring MR measurements at a plurality of voxels of the subject using a pulse sequence that reduces MR measurement phase error; and (ii) for each voxel, determining reconstructed MR phase from the MR measurements of each channel to form an MR phase image of the subject. The step of determining reconstructed MR phase may be performed for each of the voxels independently.

Abstract: A method of calibrating a sensor array having elements spaced from one another in a first direction, the array defining an array spatial response function, includes: providing a test workpiece having at least first and second calibrated defects spaced apart in the first direction by a characteristic distance such that when the first calibrated surface defect is located at a position corresponding to an array response function maximum, the second calibrated surface defect is located at a position corresponding to an array response function minimum; passing the array across the first and second calibrated surface defects in a direction normal to the first direction and determining a peak sensor signal from at least two of the elements in the array to determine an array spatial response function root mean squared average; and setting a rejection threshold as a predetermined proportion of the array spatial response function root mean squared average.

Abstract: A system for determining a direction for an electromagnetic signal. The system includes a receiving array antenna, including a plurality of antenna elements, each antenna element having a position in the receiving array antenna; a digitizer configured to receive an analog signal from each of the antenna elements, and to sample and digitize each of the analog signals to form a sequence of digitized samples from each of the analog signals; and a processing unit. The processing unit is configured to receive the sequences of sample values from the digitizer; and, for each direction of a plurality of hypothesized directions: combine the sample values from the plurality of antenna elements to form a single time record; fit the single time record with a combination of one or more functions of time; and identify a direction at which a measure of the magnitude of the linear combination is greatest.

Abstract: A device for estimating a two-dimensional direction of arrival (DOA) of an electromagnetic beam includes an antenna system, and a signal processor operatively coupled to the antenna elements of the antenna system. The antenna system includes a plurality of antenna elements arranged in a rectangular planar array and configured to receive signal components of the electromagnetic beam. The signal processor estimates the two-dimensional DOA of the electromagnetic beam based on relative phases of the signal components of the electromagnetic beam.

Abstract: Systems, methods, and apparatus are disclosed for determining bore sight error. An apparatus may include an optical lens and a collimated light source configured to emit a beam of collimated light having a first wavelength, where the beam of collimated light passes through the optical lens and parallel to an optical axis of the optical lens. The apparatus may further include a position sensitive detector configured to receive the beam emitted by the collimated light source, and identify a first position of the beam relative to the position sensitive detector. The apparatus may also include a processing device configured to generate a bore sight error metric based, at least in part, on the first position identified by the position sensitive detector. The bore sight error metric characterizes a difference between an actual position of a target object and a perceived position viewed by the optical lens.

Abstract: Examples of systems and methods for estimating a device location are disclosed. In one example, a device locating system includes three or more sensor devices, a processor, and a storage device storing instructions executable to determine an estimated location of a scanned device based on a received signal strength indication (RSSI) value for the scanned device measured by at least three of the three or more sensor devices and processed in view of previously-recorded RSSI values for the scanned device. The instructions are further executable to output the estimated location of the scanned device to a computing device for controlling operation of the computing device.

Abstract: A combined electro-mechanical adaptive antenna tracking system for wireless communication between transmitters and receivers moving relative to each other is described. This system enables one or more antenna transceivers on a moving object, such as a high altitude unmanned aerial vehicle (HALE UAV), to simultaneously track one or more separate antenna transceivers on the ground, such as multiple customer premises equipment. The antennas on the moving object are constructed with multiple-subsection phased arrays or may have multiple horns on one rotation axis. Adaptive tracking control logic is applied to synchronize electrical switch and/or mechanical rotation and electrical beamforming for the moving transceivers to track multiple ground transceivers. In one advantageous aspect, an off-the-shelf horn antenna can be used and rotated around only one axis, thereby eliminating the need for expensive two dimensional movement actuators such as gimbals and the need for tracking multiple ground based receivers.

Abstract: Techniques are discussed for conveying frequency error characteristics for a plurality of cell transceivers from a server to a mobile device to enable the mobile device to determine an optimum or near optimum period of coherent integration of a downlink signal from one or more of the plurality of cell transceivers based on the frequency error characteristics. The coherent integration of the downlink signal may be to support a downlink terrestrial positioning method such as the Observed Time Difference of Arrival (OTDOA) method for Long Term Evolution (LTE) and the downlink signal may be a Positioning Reference Signal (PRS). A mobile device may perform downlink signal integration for longer periods than the optimum period for coherent integration by combining coherent integration results using non-coherent integration. The optimum period may achieve maximum or near maximum signal to noise ratio.

Abstract: A method of determining the location of a client device includes selecting sets of four access points (APs) from APs that can communicate with a client device. Each set of four APs forms a quadrilateral that contains the location of the client device. The method further includes selecting a first quadrilateral from quadrilaterals formed by the sets of four APs based on a policy, and, with the first quadrilateral, executing a time-of-flight (ToF)-based distance estimation process to determine the location of the client device.

Abstract: A fill level measurement device is provided, including a transmission branch configured to generate and emit a transmission signal towards a filling material surface; and a receiving branch configured to receive and evaluate a received signal, wherein the fill level measurement device is configured to selectively assume an interfering signal detection mode for detecting whether the received signal comprises an interfering signal, and a fill level measurement mode for measuring the fill level, and wherein the transmission signal has a lower intensity in the interfering signal detection mode than in the fill level measurement mode.

Abstract: Described are systems and methods for drone interdiction. A target aircraft is detected based on data from one or more of one or more radars, a fixed camera image from one or more fixed cameras, and an interceptor aircraft image from a camera mounted to an interceptor aircraft. An interception location is generated describing where the interceptor aircraft and the target aircraft are expected to meet. The interceptor aircraft is directed to the interception location to immobilize the target aircraft.

Abstract: A system and method for suppressing radio frequency (“RF”) transmissions includes a transmitter for transmitting electronic signals that suppresses (e.g., prevents, disrupts, jams, interferes with or otherwise disables) RF transmissions. Some embodiments of the invention include a transmitter that suppresses one or more signals transmitted from a target transmitter in an RF transmission system to a target receiver in a wireless device operating in the RF transmission system to prevent, disrupt, jam, interfere with or otherwise disable an RF transmission between the target transmitter and the target receiver in the wireless device (i.e., target wireless device). These systems and methods may be used to interrupt communication, command and control of non-friendly combatant. These systems and methods may also be used to suppress RF transmissions to prevent the detonation of improvised explosive devices, or IEDs.

Abstract: According to an embodiment of the present disclosure, a spatial interpolation method for a linear phased array antenna relates to a spatial interpolation method for a linear phased array antenna including a plurality of transmission antenna elements and a plurality of reception antenna elements and includes Step 1 in which the plurality of reception antenna elements receive a reflected wave reflected from a target, Step 2 in which an incidence angle of the reflected wave incident on the plurality of reception antenna elements is estimated using an angle estimation algorithm, Step 3 in which a bad-conditioned antenna element is selected from among the plurality of reception antenna elements, and Step 4 in which a received signal of the bad-conditioned antenna element is compensated for and the incidence angle of the reflected wave incident on the plurality of reception antenna elements is re-estimated using an angle estimation algorithm.

Abstract: An automotive radar system and method transmit a plurality of radar signals into a region, detect reflected radar signals, and convert the reflected radar signals into digital data signals. A plurality of range-Doppler maps for the region are generated from the digital data signals, and the plurality of range-Doppler maps are averaged to generate an averaged range-Doppler map for the region. Data points in the averaged range-Doppler map are analyzed to detect blobs in the averaged range Doppler map. If a blob is detected in the averaged range-Doppler map, the radar detector is indicated to be unblocked.

Abstract: The invention provides a measuring instrument, which comprises a measuring unit for projecting a distance measuring light toward an object to be measured and for performing a distance measurement by receiving a reflected light from the object to be measured, and an attitude detecting device integrally provided with the measuring unit, wherein the attitude detecting device has tilt sensors for detecting a horizontality and relative tilt angle detectors for tilting the tilt sensors and for detecting a tilt angle of the measuring unit with respect to the horizontality under such condition that the tilt sensors detects the horizontality so that the horizontality is detected by the tilt sensor, and wherein the distance measurement of the object to be measured is performed by the measuring unit, and a vertical angle of a measuring point is determined based on the result of the tilt detection by the attitude detecting device.

Abstract: An ultrasonic sensor assembly is placed against an inside surface of a panel for sensing objects on an opposite side of the panel and includes an ultrasonic sensor, a preload structure, a coupling element, and a damping material. The preload structure applies a preload on the ultrasonic sensor toward the inside surface of the panel. The coupling element interfaces between the ultrasonic sensor and the inside surface of the panel. The damping material is placed against the inside surface but not where the coupling element interfaces between the ultrasonic sensor and the inside surface. The coupling element may include a matrix material that is reinforced with a filler.

Abstract: Techniques are disclosed for systems and methods to provide transmission signal shaping for transmission signal-based sensor systems, such as radar and/or sonar sensor systems. A low noise signal shaping transmitter includes a digital to analog converter configured to convert a digital shaping control signal to an analog shaping control signal, a signal shaping circuit configured to convert the analog shaping control signal into a shaped voltage, and a power amplifier configured to provide a shaped transmission signal based on the shaped voltage and a digital transmission control signal. Each element of the transmitter may be formed from relatively slow switching analog and/or digital circuitry components. Resulting shaped transmission signals may be used to excite radar antennas, sonar transducers, sound cells, and/or other elements of sensor systems.

Abstract: An apparatus, such as a pixel sensor for an ultrasonic imaging apparatus, is disclosed. The apparatus includes a first metallization layer coupled to a piezoelectric layer, wherein a first voltage is formed at the first metallization layer in response to an ultrasonic wave reflecting off an item-to-be-imaged (e.g., a user's fingerprint) and propagating through the piezoelectric layer, and wherein the first metallization layer is situated above a substrate; a second metallization layer situated between the first metallization layer and the substrate; and a device configured to apply a second voltage to the second metallization layer to reduce a parasitic capacitance between the first metallization layer and the substrate.

Abstract: A method for correcting Doppler shift-based speed measurements of a projectile where the correction is based upon a two-parameter model for the projectile speed. In one example application, the method is used for correcting the well-known “cosine” measurement error endemic in Doppler shift-based speed measurements is accomplished by comparing the received projectile speed data with parametric curves that are computed in a low-cost microprocessor, and selecting a set of two parametric curves that bound the received projectile data within a sufficiently narrow parametric range so that the initial projectile speed can be computed with the desired accuracy.

Abstract: The present disclosure relates to a sensor network, Machine Type Communication (MTC), Machine-to-Machine (M2M) communication, and technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the above technologies, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A device for measuring a distance, according to one embodiment of the present invention, includes a transceiver configured to transmit, to another device, a signal and receive, from the another device, another signal according to the signal, and a controller configured to determine a first interval based on the signal and the another signal and determine a distance between the device and the another device based on the first interval, a second interval regarding the another device, and a delay regarding an internal circuit of the device.

Abstract: Embodiments described herein simplify the recognition of objects in synthetic aperture radar (SAR) imagery. This may be achieved by processing the image in order to make the shadow caused by the object appear more similar to the object. Alternatively, this may be achieved by processing the image in order to make the layover caused by the object appear more similar to the object. Manipulation of the shadow caused by the object and the layover caused by the object may comprise altering the aspect ratio of the image, and in the case of manipulating the shadow caused by the image, may further comprise transforming the image by reflection or rotation. The aspect ratio of the image may be altered based on information about the image collection geometry, obtained by the SAR.

Abstract: The invention provides a system method and vehicle for profiling the terrain ahead of a vehicle. The system comprises receiving means configured to receive sensor output data from a plurality of vehicle-mounted sensors, including at least one radar sensor and at least one acoustic sensor, each for receiving a reflected signal from the terrain ahead of the vehicle. A determining means is configured to determine at least one parameter from the sensor output data for the at least one radar sensor and the at least one acoustic sensor, and an image generation means is configured to generate an image of the terrain ahead of the vehicle based on the at least one parameter from the at least one radar sensor. A processing means enhances the clarity of the image based on the at least one parameter from the at least one acoustic sensor.

Abstract: A system for using ultrasound to detect distance on mobile platform and methods for making and using same. The system includes an ultrasound transceiver that can transmit and/or receive ultrasound waves and determine distance from an object of interest using a time-of-flight of the ultrasound wave. The system is adapted to reduce noise by using a dynamic model of the mobile platform to set constraints on the possible location of a received ultrasound echo. A linear, constant-speed dynamic model can be used to set constraints. The system can further reduce noise by packetizing a received ultrasound waveform and filtering out noise according to height and width of the packets. The system likewise can remove dead zones in the ultrasound transceiver by subtracting an aftershock waveform from the received waveform. The systems and methods are suitable for ultrasound distance detection on any type of mobile platform, including unmanned aerial vehicles.

Abstract: Techniques are disclosed for systems and methods to provide accurate and compact multichannel sonar systems for mobile structures. A compact multichannel sonar system includes a multichannel transducer and associated processing and control electronics and optionally orientation and/or position sensors disposed substantially within the housing of a sonar transducer assembly. The multichannel transducer includes multiple transmission and/or receive channels/transducer elements. The transducer assembly is configured to support and protect the multichannel transducer and associated electronics and sensors, to physically and/or adjustably couple to a mobile structure, and/or to provide a simplified interface to other systems coupled to the mobile structure. The system may additionally include an actuator configured to adjust an orientation of the transducer assembly.

Abstract: A synthetic aperture sonar moving along a first axis comprises an emitting device configured to emit, in each ping, at least one acoustic pulse toward an observed zone in a set of sectors comprising at least one sector. The sonar comprises a first physical receiving antenna extending along the first axis allowing measurements of backscattered signals to be acquired and a processing device configured to form, over R pings, for each sector, synthetic aperture beams from measurements of signals backscattered by the observed zone and generated by acoustic pulses emitted in the sector. The sonar comprises at least one gyrometer. The processing device is configured to correct for variations in the movement of the first receiving antenna during the formation of the synthetic aperture beams of the set of sectors by carrying out an autocalibration by intercorrelation of the successive pings.

Abstract: An ultrasonic imaging system includes a micro-acoustic source configured to generate a broadband ultrasonic pulse. The ultrasonic imaging system further includes an acoustic leaky-wave antenna configured to use a frequency dependent angular dispersion to simultaneously collect reflected signals from multiple angles of the broadband ultrasonic pulse, wherein the reflected signals contain information about a surrounding medium. The ultrasonic imaging system further includes a sensor operationally coupled to the acoustic leaky-wave antenna, the sensor configured to detect the reflected signals collected by the acoustic leaky-wave antenna.

Abstract: An obstacle detection system includes an emitter that emits a wide angle signal, and a receiver that receives at least a portion of the wide angle signal. The obstacle detection system also includes a memory for storing a time window and a baseline signal characteristic, and a processing device that compares attributes of the received signal to information stored in the memory. The processing device determines whether at least a portion of the emitted signal was received at the receiver within the time window. The processing device also determines whether a signal characteristic of the received signal corresponds to the baseline signal characteristic.

Abstract: The invention provides a measuring instrument, which comprises a measuring instrument main unit and an installment base unit for rotatably supporting the measuring instrument main unit in an up-to-bottom direction and in a left-to-right direction, wherein the measuring instrument main unit has a measuring unit for projecting a distance measuring light toward an object to be measured and for performing a distance measurement by receiving a reflected light from the object to be measured, and an attitude detecting device integrally provided with the measuring unit, wherein the attitude detecting device has tilt sensors for detecting a horizontality and relative tilt angle detectors for tilting the tilt sensors and for detecting a tilt angle of the measuring unit with respect to the horizontality under such condition that the tilt sensors detect the horizontality so that the horizontality is detected by the tilt sensors, and wherein the installment base unit has an up-to-bottom motor for rotating the measuring in

Abstract: An object recognition device having a VCSEL Doppler sensor and an MEMS scanner; the MEMS scanner having at least one deflectable MEMS mirror for scanning an angular region using a laser beam from the VCSEL Doppler sensor; the VCSEL Doppler sensor being connected to a Doppler control and evaluation element that is adapted for determining the velocity and/or the distance of an object.

Abstract: A laser system is provided that includes a master oscillator, a pre-amplifier, a power amplifier, a beam doubler, and a beam tripler. The laser system is configured to generate three different wavelengths, including, for example, wavelengths of 1064 nm, 532 nm, and 355 nm. The pre-amplifier can be optically aligned along a beam path exiting the master oscillator, to receive and pre-amplify a laser beam generated by the master oscillator. The amplifier can be optically aligned along a beam path exiting the pre-amplifier, and can be configured to receive a pre-amplified laser beam generated by the pre-amplifier. The beam doubler and beam tripler can be optically aligned along a beam path exiting the amplifier and can be configured to double and triple, respectively, an amplified laser beam generated by the amplifier.

Abstract: An imaging system is provided for monitoring a field of view with a two-dimensional array of photo elements on which the field of view is imaged. The imaging system determines for each photo element a distance between the photo element and a surface of an object in the field of view by light emitted into the field of view and subsequently arriving on the photo elements and to determine a distance vector to form a coordinate image that includes the distance vector. A first memory unit stores the coordinate image, a second memory unit stores logical relations for the photo elements. A processing unit determines for each of the photo elements whether a logical relation is fulfilled and outputs a trigger signal when at least one of the logical relations is fulfilled.

Abstract: A vehicle that detects a lane using measurement data of a lidar sensor and a lane detection method are provided. The vehicle includes a distance sensor and a processor that is configured to determine data that indicates a road lane among data obtained by the distance sensor. Additionally, the processor accumulates the determined lane data using vehicle speed information and determines the road lane using the accumulated lane data.

Abstract: Signal acquisition methods and receivers utilizing such signal acquisition methods are disclosed. More specifically, a signal acquisition method may include: identifying a list of available beam patterns that an antenna unit is configured to provide; iteratively searching for satellite signals by controlling the antenna unit to utilize one of the list of available beam patterns in each iteration; determining whether a satellite signal is detected in each iteration; collecting ephemeris data of a satellite producing the satellite signal when the satellite signal is detected in each iteration; and controlling beamforming operations of the antenna unit for satellite signal acquisition based on the ephemeris data collected.

Abstract: Techniques for acquiring Global Navigation Satellite System (GNSS) signals at a mobile device are provided. An example process according to these techniques includes receiving sensor data from at least one sensor of the mobile device, determining one or more blocked zones based on the sensor data in which at least a portion of signals from at least one space vehicle (SV) are blocked by an obstruction, selecting one or more SVs from SV information based on the one or more blocked zones, and attempting to acquire signals from the one or more SVs.

Abstract: A map generating method includes: modeling a predetermined amount of global positioning system (GPS) data as linear segments; determining whether a difference between the modeled segments and the GPS data is within a predetermined range; and determining an amount of GPS data forming the modeled segments based on whether the difference is within the predetermined range.

Abstract: Methods that determine position of network devices in a robust manner may include a method for determining a position of a remote radio head. The method may include generating position values of the remote radio head based on signals received by a satellite positioning system (SPS) receiver, and generating additional position values of the remote radio head from a supplemental positioning unit. The method may include determining whether an error of at least one of the position values exceeds a threshold, and storing a last position value from position values having an error within the threshold, in response to determining that the error of at least one of the position values exceeds the threshold. The method may further include calculating an updated position value of the remote radio head based on at least one of the additional position values.

Abstract: A signal processing device for detecting a weak signal in an input signal. The device includes first and second pulse detectors and a determining circuit. The first pulse detector adds noise to the input signal, and processes the noise-added signal using a first threshold, to thereby output a first signal having a first pulse waveform component, which corresponds to an interval in which a level of the noise-added input signal exceeds the first threshold. The second pulse detector receives the input signal in parallel with the first pulse detector, and processes the input signal using a second threshold, to thereby output a second signal having a second pulse waveform component, which corresponds to an interval in which a level of the input signal exceeds the second threshold. The determining circuit determines whether each of the first and second pulse waveform components conforms to the weak signal.

Abstract: A radiation detection system comprising a detection grid of wavelength shifting fibers with a volume of scintillating material at the intersecting points of the fibers. Light detectors, preferably Silicon Photomultipliers, are positioned at the ends of the fibers. The position of radiation is determined from data obtained from the detection grid. The system is easily scalable, customizable, and also suitable for use in soil and underground applications. An alternate embodiment employs a fiber grid sheet or layer which is comprised of multiple fibers secured to one another within the same plane. This embodiment further includes shielding in order to prevent radiation cross-talk within the grid layer.

Abstract: A positron emission tomography (PET) detector assembly is provided. The PET detector assembly includes a plate having a first side and an opposite second side, the plate being fabricated from a thermally conductive material. The PET detector assembly also includes multiple PET detector units coupled to the first side of the plate. The PET detector assembly further includes a readout electronics section coupled to the second side of the plate, wherein, during operation, the readout electronics section generates heat that is transferred to the plate. The plate comprises a heat pipe disposed within the plate and configured to extract the heat from the plate and to transfer the heat away from the plate.

Abstract: A detector array such as for use in a radiation imaging modality is provided. The detector array includes a first pixel (302a) having a first scintillator (402). The first scintillator has a first detection surface (408) and a first light emission surface (412). The first detection surface extends along a first detection surface plane and the first light emission surface extends along a first light emission surface plane. The detector array includes a second pixel (302b) having a second scintillator (420). The second scintillator has a second detection surface (426) and a second light emission surface (430). The second detection surface extends along a second detection surface plane and the second light emission surface extends along a second light emission surface plane. At least one of the first detection surface plane is not coplanar with the second detection surface plane or the first light emission surface plane is not coplanar with the second light emission surface plane.

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: This invention describes a remmeter that is based on the use of an assembly comprising two or more different-sized hydrogenous moderators, each hydrogenous moderator incorporating a hydrogenous spectroscopic fast neutron detector and a thermal neutron detector in order to provide more accurate neutron dosimetry across a wide range of neutron energies (thermal neutrons to >15 MeV) in a form factor that is lighter than conventional remmeters. The new remmeter utilizes the principle of spectral dosimetry, where the energy or energy distribution of the incident neutrons is first measured and then this energy information (along with the measured fluence) is used to establish the dosimetric quantity using the various fluence-to-dose conversion curves (e.g. H*(10) (ICRP (1997)), NCRP-38 (1971)).

Abstract: Methods of designing seismic survey and acquisition of seismic data with reduced noise using equally or optimally irregularly spaced sources or receivers are described. Specifically, prime number ratios for the station to line spacing is used to prevent harmonic leakage and other noise contaminations in the acquired seismic data.

Abstract: Embodiments related to marine acoustic vibrator for marine geophysical surveys. An embodiment may include an apparatus, wherein the apparatus may comprise: a coil element comprising a coil; a coil clamp constraining motion of the coil element in at least one direction; and a spring disposed in a load path of the coil clamp. Additional apparatus and methods are disclosed herein.

Abstract: Measured marine survey data can be processed analogously to modeled marine survey data analogously and a misfit can be calculated between the processed measured marine survey data and the processed modeled marine survey data. A model parameter in the modeled marine survey data can be updated based on the misfit. The model parameter can be a parameter of a subsurface location.