Abstract: A method for time synchronization of various components of a magnetic resonance system includes generating a series of amplitude-modulated radio-frequency pulses and associated gradient fields to deflect the magnetization of a slice detecting at least two spin signals, determining a phase difference between two of the spin signals, processing the phase difference in order to determine at least one time shift between two of the following variables that are generated by different components of the magnetic resonance system, an envelope of the amplitude-modulated radio-frequency pulses, a radio-frequency portion of the amplitude-modulated radio-frequency pulses, and one or more gradient fields, and synchronizing the associated components of the magnetic resonance system depending on the at least one time shift.

Abstract: An object is to correct a magnetic field caused by an eddy current, which is generated due to application of a gradient magnetic field, not only in the application direction of the gradient magnetic field but also in a direction different from the application direction of the gradient magnetic field. In the present invention, in order to achieve this object, a compensation magnetic field which compensates for an eddy current magnetic field generated in each of an application direction of a test gradient magnetic field and a direction different from the application direction in each direction is calculated using the test gradient magnetic field. When generating an arbitrary gradient magnetic field, a compensation magnetic field which compensates for an eddy current magnetic field according to application of an arbitrary gradient magnetic field on the basis of the measured eddy current magnetic field in each direction is generated together with the arbitrary gradient magnetic field.

Abstract: In an abnormality detection system for a rotation angle sensor, a fact that an abnormality has occurred in one of sine signals (S1, S2) or in one of cosine signals (S3, S4) is detected based on a sum of the electrical signals (S1, S2), and a sum of the electrical signals (S3, S4) (first detection result). A fact that an abnormality has occurred in one of the positive sine and cosine signals (S1, S3) or in one of the negative sine and cosine signals (S2, S4) by comparing a first temperature computed using a correlation between an amplitude and a temperature and based on the electrical signals (S1, S3), a second temperature computed using a correlation between the amplitude and a temperature and based on the electrical signals (S2, S4), and a third temperature detected by a temperature sensor with each other (second detection result). A microcomputer identifies which of the electrical signals is abnormal by comparing the first and second detection results with each other.

Abstract: Apparatus including: an optical waveguide bundle including a plurality of optical waveguides substantially aligned along a waveguide bundle axis, each optical waveguide having a longitudinal core configured to transmit light; a plurality of the optical waveguides each including a Bragg reflector, the Bragg reflectors configured to couple light incident from a direction substantially transverse to the waveguide bundle axis into the optical waveguides in a propagating mode in the longitudinal cores; and each of a plurality of longitudinal cores being in optical communication with an optical detector configured to detect light transmitted in the longitudinal cores.

Abstract: The present invention describes a method for tracking a solar generator having a plurality of solar modules to the sun, wherein at least one electric output quantity of part of the solar module of the solar generator is detected and a tracker, on which the solar generator is mounted, is controlled such that the detected electric output quantity has a predetermined value. Further, a control for a solar plant and a solar plant having such a control are described.

Abstract: An interferometric tracking device includes image dividers arranged to form an optical cascade, with one of the image dividers being an incident image divider for the optical cascade and one or more of the image dividers being one or more exit image dividers for the optical cascade. Each of the image dividers splits incident light into a plurality of non-parallel orthogonally polarized beams, the beams from the incident image divider cascading through the other image dividers in the cascade. One of a plurality of shearing interferometers is optically coupled between optically adjacent image dividers in the cascade. The orthogonally polarized beams from the one or more exit image dividers are imaged onto one or more focal plane arrays.

Abstract: The subject disclosure is directed towards a technology by which data sensed at a device may be used to determine the likely location of the device, independent of whether GPS data is also available. In one aspect, information representing the sensed device data is sent to a remote service, where it is compared with similar information for known locations to find a matching location. In another aspect, the information is locally processed against locally cached information to find a matching location.

Abstract: A computer-implemented method may include determining that a plurality of computing devices comprising first and second computing devices are paired via a wireless communication technology that facilitates communication between the computing devices. The computer-implemented method may also include establishing a maximum distance that the first and second computing devices are allowed to move away from one another. The computer-implemented method may further include calculating a current distance between the first and second computing devices and then determining that the current distance exceeds the maximum distance. In addition, the computer-implemented method may include providing a notification to at least one of the first and second computing devices to alert a user of the first computing device that the current distance between the first and second computing devices exceeds the maximum distance and to indicate a location of the second computing device.

Abstract: A technique for deriving the locations of one or more wireless base stations is disclosed. After initializing values for the base station location coordinates, a server acquires reference coordinates of a wireless terminal, which are provided from an independent source, and also acquires values for one or more time-of-occurrences of events associated with signals that travel between the wireless terminal and the base stations. The server generates predicted coordinates of the wireless terminal, based in part on the current base station coordinates, by using trilateration. The server then generates updated base station coordinate values, based on a method of least squares, in which each residual is a difference between the reference and predicted coordinates of each wireless terminal location, for one or more wireless terminals. The server modifies the base station coordinate values so as to minimize the least-squares function.

Abstract: A method includes computing a cross-spectral surface of a signal. The method further includes determining initial frequency estimates to be points on the cross-spectral surface. The method further includes performing a polynomial interpolation to generate an initial frequency polynomial. The method further includes integrating the initial frequency polynomial to generate an initial phase polynomial. The method further includes processing the signal to generate a basebanded signal. The method further includes determining unwrapped phase values of the basebanded signal. The method further includes performing a second polynomial interpolation to generate a residual phase polynomial. The method further includes generating an updated phase polynomial based on the initial phase polynomial and the residual phase polynomial. The method further includes differentiating the updated phase polynomial to generate a polynomial approximation of the time-varying carrier frequency of the received signal.

Abstract: An altimeter system is provided. The altimeter system includes a receiver mixer including an antenna-input and a local-oscillator-input; a transceiver circulator communicatively coupled to an antenna via a transmission line having a selected length and communicatively coupled to the antenna-input of the receiver mixer; and a transmitter configured to output a transmitter signal to the antenna via the transceiver circulator. The transmitter signal is frequency modulated with a linear ramp. The transmitter is communicatively coupled to the receiver mixer to input a local oscillator signal at the local-oscillator-input of the receiver mixer. The receiver mixer is communicatively coupled to input a target-reflected signal from the antenna at the antenna-input of the receiver mixer. The selected length of the transmission line is set so that a composite-leakage signal at the antenna-input of the receiver mixer has a linear phase across a sweep bandwidth.

Abstract: A method for suppressing clutter when detecting objects of interest in a radar system is provided. The method includes defining a plurality of scatterer classes corresponding to a plurality of predetermined scatterer motion types, at least one of the classes corresponding to ballistic acceleration, and at least one of the classes corresponding to non-ballistic acceleration. A plurality of sensor pulses are transmitted, and reflected return pulses are received. Scatterers identified in the radar return signal are associated with one of the scatterer classes. A set of complex weights is generated and applied to the radar return signal data to null scatterers associated with the class corresponding to ballistic acceleration.

Abstract: Provided is a device for detecting intruding objects that enables the detection of intruding objects without requiring antenna switching. Delay units (102) use different delay amounts to delay signals received at each of a plurality of antennas (110). A signal synthesis unit (103) synthesizes the delayed signals. A frequency conversion unit (106) converts the synthesized signal frequency to a baseband. A wave detection unit (107) detects the signal that has undergone frequency conversion. A radar profile generation unit (104) uses the detected signal to generate a profile formed from the distance from the antenna, and the signal strength at each distance from the antenna. A detection processing unit (105) detects a peak in the profile at which the signal strength exceeds a preset threshold value, and determines whether an intruding object is present in a detection region on the basis of the detected peak.

Abstract: A method may include generating for transmission a repeating sequence of N constant-frequency pulses of width t seconds at interpulse intervals of T seconds, with each pulse in the sequence having a particular constant phase according to a quadratic phase sequence, which phase is applied to each pulse in a first sense of modulation. The method may further include modulating the phase of echo energy received from one or more objects reflecting the transmitted repeating sequence of N constant-frequency pulses with a second sense of modulation opposite to the first sense of modulation. The method may further include producing from the modulated received echo energy N unique and discrete frequency translations of the received echo energy as a function of range r of the reflecting objects, of magnitude equal to multiples of 1/NT Hz, which may preserve the spectrum of the received echo energy, forming in combination a composite signal frequency spectrum.

Abstract: Various embodiments of TOF depth cameras and methods for illuminating image environments with illumination light are provided herein. In one example, a TOF depth camera configured to collect image data from an image environment illuminated by illumination light includes a light source including a plurality of surface-emitting lasers configured to generate coherent light. The example TOF camera also includes an optical assembly configured to transmit light from the plurality of surface-emitting lasers to the image environment and an image sensor configured to detect at least a portion of return light reflected from the image environment.

Abstract: A method for generating a Doppler image by using a ultrasound system, the method including: transmitting a ultrasound signal to an object and receiving a response signal reflected from the object; converting the response signal into a plurality of in-phase/quadrature-phase (I/Q) signals having different frequencies; and generating a Doppler image of the object based on information about a speed of the object obtained from the plurality of I/Q signals.

Abstract: An ultrasonic measurement apparatus is described having a receiving device which determines a measurement sequence relating to a time variation of the period lengths of an ultrasonic signal received from an in-vehicle and/or external ultrasonic transmitter, a comparison device which determines a comparison information item relating to a deviation of the determined measurement sequence from at least one reference sequence, and an evaluation device which determines, taking into consideration the determined comparison information item, an information item relating to a signal form transmitted by the ultrasonic transmitter, a relative speed between the receiving device and the ultrasonic transmitter, a relative speed of at least one reflecting object situated in a transmission path between the receiving device and the ultrasonic transmitter, and/or a shape feature of the at least one reflecting object. A method for evaluating an ultrasonic signal is also described.

Abstract: A method for operating a radar system on a vehicle to reduce nuisance alerts caused by a stationary structure proximate to the vehicle. The method includes determining a stationary count indicative of the number of targets detected by the radar system that are within a travel path of the vehicle and are classified by the radar system as stationary, and indicating that the vehicle is proximate to a stationary structure if the stationary count is greater than a count threshold.

Abstract: An antenna system including: an input port configured to receive tracking mode signals, in two orthogonal polarizations, from a target; a tracking coupler, configured to receive the tracking mode signals from the input port, the tracking coupler including: a first pair of opposed slot couplers configured to extract tracking signals from the tracking mode signals in a first one of the orthogonal polarizations, and a second pair of opposed slot couplers configured to extract tracking signals from the tracking mode signals in a second one of the orthogonal polarizations; and a tracking combiner network configured to combine the extracted tracking signals from the pairs of opposed slot couplers to generate tracking output signals for use in controlling the antenna system to track the target.

Abstract: An electronic device for preventing an accidental touch and an operating method thereof are disclosed, where the electronic device includes a first input device, a second input device, synthetic aperture radar and a main system. The synthetic aperture radar can sense whether a charged body is positioned near the second input device. When the charged body is positioned near the second input device, a voltage state of the synthetic aperture radar is pulled to a first logic level. When the voltage state of the synthetic aperture radar is in the first logic level, the main system disables the first input device.

Abstract: Systems and methods are operable to identify and indicate opportunities for an In-Trail procedure (ITP) aircraft to make an ITP altitude change. An exemplary embodiment receives information corresponding to a desired ITP altitude for the ITP aircraft and a projected window period; estimates at least one ITP maneuver opportunity window based on the estimated location of each of the plurality of other aircraft and based on a current airspeed and a current altitude of the ITP aircraft; generates a screen shot that presents an ITP maneuver opportunity window icon, wherein the ITP maneuver opportunity window icon graphically indicates the soonest time and the latest time that the ITP aircraft may initiate the ITP maneuver, and wherein the ITP maneuver opportunity window icon indicates an altitude change made by the ITP aircraft will maintain minimum safe self-separation distances from the plurality of other aircraft during the ITP maneuver.

Abstract: An electronically steered weather radar system comprises a plurality of transmit/receive modules, a plurality of antenna modules, and a system signal processor. Each transmit/receive module may be configured to adjust a phase characteristic of a radio frequency (RF) signal to be transmitted and received. Antenna modules may be in communication with transmit/receive modules and may form an antenna array configured to transmit a system beam in a direction determined by the phase of the RF signal from each transmit/receive module and to generate the RF signal from the received system beam. The system signal processor may be configured to perform a first scan to detect meteorological formations wherein the system signal processor communicates with each transmit/receive module to adjust a phase characteristic of the RF signals such that the antenna array transmits and receives the system beam through a plurality of azimuth angles and a plurality of elevation angles.

Abstract: An ultrasound interior space monitoring system for a motor vehicle includes at least one ultrasound transmitter and at least one ultrasound receiver that can be attached in the interior space of the motor vehicle and are configured for the contactless monitoring of the interior space. The system is operable in an operating mode which is active when a monitoring mode in which the monitoring of the interior takes place is inactive, wherein a position, a movement speed and/or a movement direction of an object, in particular of a hand of a vehicle occupant, can be determined and at least one fitting element of the vehicle can be actuated in dependence on the position, on the movement speed and/or on the movement direction by means of the at least one ultrasound transmitter and by means of the at least one ultrasound receiver in the operating mode.

Abstract: A method of depiction of an object in underwater space is provided. The underwater space is acoustically covered using nonlinear wave packets capable of retaining coherence in shallow waters. The echo from the object is encoded as perturbations on flexible cilia-like transducers that are otherwise undergoing limit cycle oscillations. The perturbed pattern of the cilia-like transducers is recorded as holograms and transmitted. The hologram is decoded and a hologram of the underwater space is created. A small hemispherical drive apparatus actuates the cilia to undergo the limit cycle oscillations. Electromagnets are positioned on a housing of the apparatus. A gimbal with shaft is also attached to the housing. The shaft has a first end within the housing that is proximally separated and remains separated from the electromagnets as the shaft rotates. Generated signals excite electromagnets in sequence to produce an electromagnetic track for the shaft.

Abstract: A method of determining extrinsic calibration parameters for at least one sensor (102, 104, 106) mounted on transportable apparatus (100). The method includes receiving (202) data representing pose history of the transportable apparatus and receiving (202) sensor data from at least one sensor mounted on transportable apparatus. The method generates (204) at least one point cloud data using the sensor data received from the at least one sensor, each point in a said point cloud having a point covariance derived from the pose history data. The method then maximizes (206) a value of a quality function for the at least one point cloud, and uses (208) the maximized quality function to determine extrinsic calibration parameters for the at least one sensor.

Abstract: A code symbol reading system is provided. The code symbol reading system has an object detection subsystem that can be configured to detect only those objects that are positioned at a specified distance from the system. The object-detection subsystem thereby initiates the scanning process only when an object is detected at substantially the specified distance from the system.

Abstract: The invention relates to an optical measuring device (1) having a housing (3), in which at least one optical emitter (20) for emitting at least one emission beam (22, 24) and at least one optical receiver are arranged, wherein a cover disc (5) terminates the housing and forms an emission window (10) and a reception window (7), wherein the at least one emission beam (22, 24) exits from the housing through the emission window (10), wherein the receiver receives the emission beam, which is reflected from the surroundings, as a reception beam through the reception window (7), and wherein the cover disc (5) has a heating assembly (20), and a corresponding method for producing a cover disc (5) for the optical measuring device (1).

Abstract: It is disclosed to keep a track of quality information of at least one assistance data, the track of quality information being associated with a current version and at least one previous version of the at least one assistance data, and to determine whether to provide assistance data information associated with at least one assistance data of the at least one assistance data to a mobile device based on tracked quality information of the at least one assistance data of the at least one assistance and based on assistance data handling parameters associated with the mobile device.

Abstract: Assisted-GPS for a portable biometric monitoring device is provided. The portable biometric monitoring device may obtain updated ephemeris data from an associated secondary device via a short-range, low-power communication protocol. The secondary device may be a computing device such as a smartphone, tablet, or laptop. Various rules may control when the ephemeris data is updated. The ephemeris data may be used in the calculation of the global position of the portable biometric monitoring device. Additionally, the portable biometric monitoring device may communicate downloaded position fixing data to the associated secondary device. The associated secondary device may then calculate the global position from the position fixing data.

Abstract: Systems and methods for monitoring broadband radio frequency interference are provided. In certain embodiments, a method comprises calculating a smoothed carrier to noise value for a received signal on a processing unit, wherein the received signal is associated with a receiver and at least one satellite; calculating an average jammer power to noise power value for the receiver; calculating an instantaneous carrier to noise value for the received signal based on the average jammer power to noise power value and the smoothed carrier to noise value; comparing the instantaneous carrier to noise value to an exclusion threshold, and determining whether to exclude the received signal from calculations of global positioning data based on the comparison of the instantaneous carrier to noise value to the exclusion threshold; and when the received signal is excluded, monitoring the received signal for readmittance to the calculation of global positioning data.

Abstract: A method of acquiring a satellite signal includes providing a CDMA-modulated signal, defining a first search frequency interval and a first reception sensitivity, and performing a first acquisition of the modulated signal according to the first sensitivity and the first frequency interval in order to provide an acquisition or failed acquisition result. In case of a failed acquisition, performing a second acquisition of the modulated signal as a function of a second search frequency interval, narrower than the first frequency interval, and a second reception sensitivity, greater than the first sensitivity and depending on a power of a side lobe of the modulated signal.

Abstract: A dosimeter measures radiation dosage to a subject during a magnetic resonance imaging guided radiation therapy session. The dosimeter includes an outer surface configured to receive a surface of the subject, and discrete cells. Each of the discrete cells is filled with a magnetic resonance radiation dosimeter.

Abstract: System and method for monitoring receipt and estimating flux value, in real time, of incident radiation, using two or more nanostructures (NSs) and associated terminals to provide closed electrical paths and to measure one or more electrical property change values ?EPV, associated with irradiated NSs, during a sequence of irradiation time intervals. Effects of irradiation, without healing and with healing, of the NSs, are separately modeled for first order and second order healing. Change values ?EPV are related to flux, to cumulative dose received by NSs, and to radiation and healing effectivity parameters and/or ?, associated with the NS material and to the flux. Flux and/or dose are estimated in real time, based on EPV change values, using measured ?EPV values. Threshold dose for specified changes of biological origin (usually undesired) can be estimated. Effects of time-dependent radiation flux are analyzed in pre-healing and healing regimes.

Abstract: The invention relates to a method and a system for using photofission to probe an article containing potentially radiation-emitting elements. The article is bombarded by a beam of electrons of sufficient energy, and they are converted into photons by bremsstrahlung directly within the article to be probed, which article is likely to contain photofissile material. No target is added to the package to perform this conversion. Preferably, the article to be probed is a package of radioactive waste, in which the container is made of thick absorbent concrete.

Abstract: A liquid scintillation counting system employs a guard detector efficiency compensation system to adjust sample event counts to compensate for a non-ideal guard which may not detect all cosmic and environmental gamma background noise events. The system and method determines counts of events detected coincidently by a guard detector subsystem and a sample detector subsystem in one or more energy regions as well as counts of events that are detected by the sample detector subsystem and not coincidently detected by the guard detector subsystem for the respective energy regions. The system and method calculates correction values for the respective energy regions based on the counts of coincident and non-coincident events and the guard efficiency values associated with the respective energy regions, using, for example, a quenched or unquenched sample. The system then applies the calculated correction values to counts for the respective energy regions, to produce corrected sample event counts.

Abstract: A nuclear scanner includes an annular support structure (32) which supports a plurality of detector modules (30). Each detector module includes a cooling and mounting structure (34) to which a plurality of tiles (40) are mounted by passing pins (46-49) through holes (38) in the cooling and mounting structure (34) to position each tile and thermally connect each tile to the cooling and mounting structure (34). A tile mount (44) on the side of the tile that makes contact with the cooling and mounting structure has a smooth face to make contact with the cooling and mounting structure to provide good thermal contact between the tile (40) and the cooling and support structure (34).

Abstract: An electronic device to simply and efficiently measure energy of incident photons in a very short time and with a very high count rate and high precision, starting from current pulses from an ionizing electromagnetic radiation detector, the electronic device including an analog delay line with switched capacitors with controlled loss at an output from a charge preamplifier.

Abstract: The present invention relates to a pixel detector (10), comprising a semiconductor sensor layer (12), in which charges can be generated upon interaction with particles to be detected. The semiconductor layer defines an X-Y-plane and has a thickness extending in Z-direction. The detector further comprises a read-out electronics layer (14) connected to said semiconductor layer (12), said read-out electronics layer (14) comprising an array of read-out circuits (20) for detecting signals indicative of charges generated in a corresponding volume of said semiconductor sensor layer (12). The neighboring read-out circuits (20) are connected by a relative timing circuit configured to determine time difference information between signals detected at said neighboring read-out circuits (20).

Abstract: Imaging systems, methods, and computer readable mediums are provided. Image detectors are installed in a gantry to detect image information related to a subject. If obstructions are detected related to the field of view of an image detector, a system matrix can be updated accordingly. Thus, upon image reconstruction, artifacts related to obstructions can be minimized or altogether eliminated. This system can be a Nuclear Medicine (NM) imaging system to acquire Single Photon Emission Computed Tomography (SPECT) image information.

Abstract: A method for detecting a neutron includes providing a first voltage to an input electrode of a microchannel plate, providing a second voltage to an output electrode of the microchannel plate, the second voltage being more positive than the first voltage, measuring a signal on the output electrode, and detecting a neutron based on a comparison of the signal at the output electrode with a baseline value.

Abstract: A vibration detector (100) is disclosed herein. In a first embodiment, the vibration detector (100) includes a support member (300, 302) arranged to vibrate, and a sensor (207) arranged to detect a vibration frequency of the support member (300, 302). The vibration frequency to be detected is dependent on the support member's mechanical structure, in which the support member's mechanical structure is mechanically reconfigurable to vary the vibration frequency to be detected by the sensor (207).

Abstract: A micro geophone having pole pieces do not extend out around the sides of the magnet, thereby allowing a reduced geophone diameter for a given magnet diameter. The pole pieces are adhesively bonded to the magnet using an adhesive, which may be made suitably electrically conductive by silver or nickel fillers or non-conductive by mica fillers such as borosilicate glass micro-spheres. Axial space is economized by eliminating traditional spider retaining rings. The spider springs are seated directly against the coil form and secured by adhesive fillets disposed on the outward-facing spring circumferences. The spider springs include circumferential notches to receive adhesive. A two-piece bimetallic coil form of aluminum and a heavier material, joined by adhesive, is provided. Headers are affixed to the housing within the seats by adhesive. A straight or rounded chamfer at each of the geophone ends allows the overall geophone dimensions to be maximized.

Abstract: The present disclosure relates to methods and apparatuses for reducing propagation delay uncertainty while conducting a survey. The apparatus includes a plurality of nodes along a communication path configured to allow communication between nodes with only one clock domain boundary crossing. Each node may include a clock, a memory, and a processor. The plurality of nodes is arranged in a linear topology. The linear topology may have first and second nodes on the ends of the line. The method may include reducing propagation delay uncertainty using at least one time marker transmitted to each of the plurality of nodes without crossing a clock domain boundary of any other node.

Abstract: An approach for seismic data analysis is provided. In accordance with various embodiments, the active learning approaches are employed in conjunction with an analysis algorithm that is used to process the seismic data. Algorithms that may employ such active learning include, but are not limited to, ranking algorithms and classification algorithms.

Abstract: A method and apparatus are provided for estimating an inter-node distance between a sender node and a receiver node belonging to a network comprising a plurality of nodes arranged along towed acoustic linear antennas. An acoustic signal is transmitted from the sender node to the receiver node through an underwater acoustic channel. The method includes estimating the inter-node distance as a function of an estimate of a sound speed profile of the underwater acoustic channel, the sound speed profile depending on depth.

Abstract: A system for aquatic seismic prospecting includes at least one submerged mobile seismic source for creating a disturbance transmitted through an aquatic medium in the form of waves and at least one cable having a plurality of sensors for collecting waves transmitted by the at least one submerged mobile seismic source and reflected from geological layers beneath the aquatic medium. The system also includes means for detecting and measuring the reflected waves and means for placing the at least one cable under tension, the tensioning means attached to ends of the at least one cable and the tensioning means keeping the at least one cable in a pseudo-stationary position. These is also means for holding the at least one cable at a substantially constant depth greater than approximately 5 meters.

Abstract: A transmitter on a bottomhole assembly (BHA) is used for generating a transient electromagnetic signal in an earth formation. A processor estimates the distance to a resistivity interface using a signal produced by a receiver on the BHA. The transmitter-receiver distance may be less than 1 m. The estimation of the distance is done in real time using a thin conductive sheet approximation.

Abstract: A method and apparatus is provided for bucking a magnetic field of known geometry and time variation by means of a plurality of bucking loops. It utilizes multiple loops, each of which is energized by an electric current that creates a magnetic field of the known time variation. The multi-loop field forms a bucking magnetic field that better opposes the spatial variation in the known magnetic field over a volume than can the magnetic field from a single loop. The present invention is useful in electromagnetic measurements, where the magnetic field of a controlled source transmitter must be annulled at a magnetic field sensor. It is particularly useful for cases where the magnetic sensor may move relative to the transmitter, such as in certain airborne electromagnetic measurements.

Abstract: A technique facilitates collection and use of data on subterranean formations. The technique comprises obtaining gravity measurements through the use of seismic streamers. At least one streamer is provided such that each streamer has multiple sensors, e.g. accelerometers. The at least one streamer is towed with a tow vessel, and gravity data are accumulated via the multiple sensors during towing.

Abstract: Displaying data sets indicative of physical parameters associated with a formation penetrated by a wellbore. At least some of the illustrative embodiments are methods including: obtaining data regarding a trajectory of a wellbore; obtaining a first data set indicative of a first physical parameter associated with a formation penetrated by the wellbore; obtaining a second data set indicative of a second physical parameter associated with the formation; displaying a two-dimensional image that simulates a three-dimensional trajectory of the wellbore, the two-dimensional image from a particular viewpoint relative to the three-dimensional trajectory of the wellbore; displaying along the two-dimensional image a representation of the first data set on a first surface that abuts the trajectory of the wellbore; and displaying along the two-dimensional image a representation of the second data set on a second surface that abuts the trajectory of the wellbore.