A sonar transducer array assembly comprises a first flexible circuit, a second flexible circuit, and a plurality of transducer elements. The first and second flexible circuits each include a first side, a second side, and a plurality of adhesive areas spaced apart and positioned in a line along one edge of the first side. The transducer elements each include a first surface attached to one of the adhesive areas of the first flexible circuit, an opposing second surface attached to one of the adhesive areas of the second flexible circuit, and a third surface positioned between the first and second surfaces. The transducer elements form a linear array with the third surface of each transducer element in alignment and configured to transmit and receive an acoustic pressure wave.

A marine multibeam sonar device comprises a processing element and a transmitter. The processing element generates a plurality of transmit transducer electronic signals and inverts a polarity of a first portion of the transmit transducer electronic signals. The transmitter is in communication with the processing element and includes a plurality of transmit electronic circuits and a plurality of transmit transducers. Each transmit electronic circuit receives and processes one of the transmit transducer electronic signals, wherein a first portion of the circuits re-inverts the polarity of the first portion of the transmit transducer electronic signals. The transmit transducers receive the processed transmit transducer electronic signals from the transmit electronic circuits and generate a sonar beam.

An underwater information visualization device, which is installed on a moving body such as a ship traveling near a water surface and visualizes and displays information about fish in the water and the seabed using an ultrasonic wave, includes circuitry that generates a pseudo noise sequence signal and a modulation circuit that modulates a carrier signal to form a transmission signal, emits a transmission signal as an ultrasonic wave into the water, receives an echo of an ultrasonic wave, determines an echo corresponding to a transmission signal by subjecting the echo to correlation processing with a pseudo noise sequence signal, displays an output signal. The display simultaneously displays multiple reception signals on a screen, and a period of transmission signals is (2D/Vu) or less when an underwater sonic wave speed is Vu and a distance to the seabed is D.

A distributed acoustic anti-unmanned boat intelligence system (DAAUBS) for detecting unmanned boats (UB) approaching protected sites includes a plurality of airborne defense agents (ADAs) and a base station. Each ADA is equipped with air balloons, tethers, buoys, a directional microphone array, a first computing device, and a transceiver. The first computing device causes at least processor to determine information regarding each approaching UB. The base station includes a control center configured with a wideband communications link configured to communicate with the transceiver of each ADA. The DAAUBS control center includes a second computing device performing an intelligence method. The second processor receives and aggregates the data of each approaching UB and performs adaptive noise cancellation to remove environmental background noise. The second processor uses a deep learning classifier to classify at least one of a type and size of the UB.

A method for compensating a depth-dependent attenuation in ultrasonic signal data of a medium and a system for performing the method. The method is implemented by a processing system (8), the method comprising the following: processing (c), in which ultrasound signal data is processed by the processing unit for providing in-phase and quadrature phase (IQ) data of the medium, and attenuation compensation (f), in which a phase of the IQ data is compensated as a function of a respective frequency shift amount for each of a plurality of different depths (z.sub.1, z.sub.2, z.sub.n) in the medium, such that the IQ data spectrum is recentered across the plurality of different depths.

A system for reforming sonar emissions from a sonar transducer element or an array of sonar transducer elements is provided. The system comprises the sonar transducer element or the array of sonar transducer elements. The sonar transducer element or the array of sonar transducer elements define an emitting face and are configured to transmit sonar signals along path(s). The system also comprises a horn comprising surface(s). Surface(s) are positioned adjacent to or in a spaced apart manner from the emitting face of the sonar transducer element or the array of sonar transducer elements so that the surface(s) are positioned at least partially in path(s) such that at least some of the sonar signals transmitted from the sonar transducer element or the array of sonar transducer elements are redirected based on interaction of the at least some of the sonar signals and surface(s).

A survey system including a multibeam echo sounder and a beam selector for selecting beams with the largest amplitudes.

An apparatus for artificial intelligence (AI) bathymetry is disclosed. The apparatus includes a sonic unit attached to a boat, the sonic unit configured to generate a plurality of metric data as a function of a plurality of ultrasonic pulses and a plurality of return pulses. An image processing module is configured to generate a bathymetric image as a function of the plurality of metric data, identify, as a function of the bathymetric image, an underwater landmark, and register the bathymetric image to a map location as a function of the underwater landmark. A communication module is configured to transmit the registered bathymetric image to at least a computing device. An autonomous navigation module is configured to determine a heading for the boat as a function of a path datum and command boat control to navigate the boat as a function of the heading.

A method comprising: providing an autonomous vehicle (AV) with a first estimated position of a target; directing the AV to travel toward the first estimated position at a constant velocity; receiving echo signals of transmitted sonar signals, the echo signals indicating a range and an azimuth of the target; determining a depth difference of the AV and the target based on the received echo signals, the depth difference being determined based on changes to the range and azimuth of the target over time; and in response to a depth difference existing, re-directing the AV toward a second estimated position of the target generated from the depth difference.

An apparatus, a method, and computer-implemented media. The apparatus is to receive, simultaneously, electrical signals based on respective reflected frequencies of a reflected ultrasonic waveform reflected from a target object as a result of a transmitted ultrasonic waveform; compound information from the electrical signals to generate compounded electrical signals; and cause generation of an output image on a display based on the compounded electrical signals.