Abstract: A positioning system comprising a processing system (7; 9) configured to receive a first position estimate for a mobile device (7), and to receive data representative of an acoustic signal received by the mobile device (7) from one of a plurality of acoustic transmitter units (2, 3, 4, 5). For each of the acoustic transmitter units (2, 3, 4, 5), the processing system (7; 9) determines spatial likelihood data representative of a likelihood of the received acoustic signal having been transmitted by the respective acoustic transmitter unit by comparing a time-of-flight range value with a geometric distance value, representative of a distance between the acoustic transmitter unit and the first position estimate.

Abstract: Determining locations to gather information to reduce the number of locations without reducing the information gathered is of key importance when such observations require drilling or other resource-intensive activities. By utilizing ergodic sampling, the same information (volume and/or resolution) may be obtained when compared to an exhaustive grid approach but with significantly fewer observations.

Abstract: A system for evaluation of a sheathing behind a casing of a wellbore. One or more wave generators provide at least asymmetric lamb (AL) waves through a casing having an anisotropic property in a first mode of the system, and provide at least shear horizontal acoustic (SHA) waves through the casing in a second mode that is concurrent with the first mode. A receiver receives indications associated with the SHA waves and the AL waves. At least one processor determines a quality of the sheathing behind the casing based in part on the indications associated with the SHA waves and the AL waves.

Abstract: System and techniques to position a first source array at a fixed first inline distance from a vessel, position a second source array at a fixed second inline distance from a vessel, wherein the fixed second horizontal inline distance differs from the fixed first horizontal distance, generating a spatial coding, fire the first source array, and fire the second source array.

Abstract: The present disclosure relates to a method of simultaneous manufacturing, from a same substrate (101), at least one first CMUT transducer (I) having a first resonance frequency and at least one second CMUT transducer (II) having a second resonance frequency different from the first frequency, the method comprising the steps of: a) for each transducer (I, II), forming a cavity (103) on the upper surface side of the substrate, and forming a flexible membrane (105) suspended above the cavity (103); b) forming a first layer (109) extending over a portion only of the upper surface of the membrane (105) of the first transducer (I) and which does not extend over the membrane (105) of the second transducer (II); and c) forming a second layer (111) extending over the entire upper surface of the membrane (105) of the first transducer and over the entire upper surface of the membrane of the second transducer.

Abstract: An acoustic transmission device may communicate sensing data via one or more multiple-input multiple-output (MIMO) transmissions. The device may comprise a serial peripheral interface (SPI) and/or a phase shifting key (PSK) modulator. The device may be configured to provide a first SPI signal, perhaps including one or more coded information bits, to the PSK modulator. The device may provide a second SPI signal, perhaps including a synchronous clock signal, to the PSK modulator. The device may generate of one or more symbols on N transmit branches based on the first SPI signal. The device may generate of at least one carrier frequency with one or more phases to form one or more phased carriers based on the second SPI signal. The device may control a transmission of the sensing data (e.g., video) via the one or more symbols on the N transmit branches on the one or more phased carriers.

Abstract: Circuitry for driving a transducer for an object detection system, the circuitry comprising drive circuitry configured to generate a drive waveform for the transducer, current monitor circuitry for monitoring a current through the transducer, and system identification circuitry. The system identification circuitry is configured to determine a characteristic of the transducer based on a first signal indicative of a drive voltage for the transducer and a second signal indicative of the current through the transducer. The circuitry is operative to adjust the drive waveform based on the determined characteristic of the transducer.

Abstract: In a method for multipath reflection correction of acoustic signals received at an ultrasonic sensor, acoustic signals are received at the ultrasonic sensor over a time of flight range. Characteristics of multipath reflection signals of received acoustic signals are determined, wherein the characteristics of the multipath reflection signals of the received acoustic signals comprise a relationship of primary signal contributions to multipath reflection signal contributions for the acoustic signals received at the ultrasonic sensor at a plurality of times of flight for a plurality of locations of the ultrasonic sensor. The characteristics of the multipath reflection signals of received acoustic signals are compared to the received acoustic signals.

Abstract: A geofenced autonomous aquatic drone for repelling sharks from a shoreline. The drone employs a buoyant housing resembling a portion of a predator such as an orca whale. A battery positioned within the drone is recharged through a floating inductive charging station. A transmitter unit coupled to at least one under water transducer introduces certain sounds, such as reproduction of orca whale or dolphin calling sounds. A propulsion system controlled a microprocessor receives location information via DGPS for providing a geofence around an area to be patrolled. The drone travels within the geofence area, monitored by the DGPS receiver, while said transducer produces certain sounds and or a solution of shark repellant is dispensed.

Abstract: A synthetic aperture sonar (SAS) system utilizes a novel timing and pointing method to illuminate and process data from multiple receive channels over one or more elevation swaths. The system further utilizes cross-track interferometry to improve accuracy of three-dimensional mapping.

Abstract: A method for predicting a risk of early screen-out in a near-well zone based on distributed fiber acoustic sensing (DAS) is provided.

Abstract: A method of autonomously preventing fouling of a submerged vessel, the method comprising: activating, by one or more computing devices, a at least one transducer and at least one sensor at a first area; generating, by one or more computing devices, a predetermined sound wave from the at least one transducer; monitoring, by one or more computing devices, data collected by the at least one sensor; altering, by one or more computing devices, the at least one transducer, wherein the alteration is based on the data collected by the at least one sensor; and autonomously adjusting, by one or more computing devices, at least one of the at least one transducer, wherein at least one of the transducers is activated.

Abstract: Broadband ultrasound transducers and related methods are disclosed herein. An example ultrasonic transducer disclosed herein includes a substrate and a first membrane supported by the substrate. The first membrane is to exhibit a first frequency response when oscillated. The example ultrasonic transducer includes a second membrane supported by the substrate. The second membrane is to exhibit a second frequency response different from the first frequency response when oscillated. The example ultrasonic transducer includes a third membrane supported by the substrate. The third membrane is to exhibit one of the second frequency response or a third frequency response different from the first frequency response and the second frequency response when oscillated. A shape of the first membrane is to differ from a shape of the second membrane and a shape of the third membrane.

Abstract: Systems and methods are provided for determining localization information for sources of seismic energy positioned below a ground surface. In accord with one series of embodiments, a method of determining localization information receives data from first seismic sensors in a first three dimensional array containing sensors emplaced below the ground surface and coherently processes the signals to provide three dimensional localization information that enables determination of an angle of arrival for a signal of interest. In combination with data from second seismic sensors in a second three dimensional array the method provides determination of a position in three dimensional space.

Abstract: A receiving apparatus (7) that can estimate a motion-induced frequency shift in a received signal comprises a processing system (205) and a receiver (204) configured to receive a signal comprising one or more instances of a transmitted signal. The processing system (205) is configured to generate data representative of a plurality of impulse response functions by deconvolving the received signal with each of a plurality of templates representative of the transmitted signal shifted in frequency by a different respective frequency shift. The processing system (205) is further configured to evaluate a signal-to-noise measure for each of the plurality of impulse response functions, and to identify an impulse response function of the plurality of impulse response functions for which the signal-to-noise measure satisfies a peak criterion.

Abstract: Disclosed herein are system, apparatus, article of manufacture, computer-implemented method, and/or computer-program product (computer-readable non-transitory storage medium) embodiments, and/or combinations and sub-combinations thereof, for an environmentally aware remote control. An example embodiment operates by at least one processor detecting a first signal and a second signal and receiving information corresponding to at least a physical position where a user is located relative to at least the first physical source. The at least one processor may further operate by calculating a time difference between a given sample of the first signal and a corresponding sample of a second signal at the physical position where the user is located, and adjusting a relative timing of the first signal with respect to the second signal. In some further embodiments, the at least one processor may adjust other attributes of either signal besides timing, e.g.

Abstract: The present application provides a method, device and system for determining a relative angle between intelligent devices, and intelligent devices. The method is applicable to a first intelligent device. The first intelligent device includes a first sound detection module and a second sound detection module. The relative angle between intelligent devices can be determined quickly, simply, conveniently and accurately.

Abstract: Waveform emission location determination systems and associated methods are described. According to one aspect, a waveform emission location determination system includes a plurality of detectors configured to receive a waveform emitted by a source and to generate electrical signals corresponding to the waveform, processing circuitry configured to access data corresponding to the electrical signals generated by the detectors, use the data to determine a plurality of spheres, and wherein a surface of each of the spheres contains a location of the source when the waveform was emitted by the source, determine an intersection of the spheres, and use the intersection of the spheres to determine the location of the source when the waveform was emitted by the source.

Abstract: An ultrasonic image display system and a program for controlling an ultrasonic image display system are disclosed herein. The ultrasonic image display system includes at least one processor and memory. In the memory is stored at least one protocol including a plurality of image acquisition steps. The processor is adapted to load the protocol to start a first run of the protocol, interrupt the first run of the protocol, acquire data for a second ultrasonic image of the patient and store the data in the memory after interrupting the first run of the protocol at one of the acquisition steps. The processor is adapted to interrupt the second run of the protocol at the same one of the acquisition steps or give notice that the second run of the protocol will be interrupted at the same one of the acquisition steps.

Abstract: A method for estimating a range of a moving target, the method including emitting, from a target, a first ultrasound signal T, wherein the first ultrasound signal T is generated based on a first differential Zadoff-Chu sequence x; receiving, at a receiver, a second ultrasound signal R, which corresponds to the first ultrasound signal T, wherein the second ultrasound signal R includes a second differential Zadoff-Chu sequence y; correlating the first ultrasound signal T with the second ultrasound signal R to calculate an initial time of flight estimate taucorr; and calculating an initial range estimate dcorr by multiplying the initial time of flight estimate taucorr with a speed of sound c. A differential Zadoff-Chu sequence is different from a Zadoff-Chu sequence.