A sonar system is provided including a display screen, a transducer assembly including at least one transducer that is configured to emit one or more sonar signals into an underwater environment and receive sonar return data reflected from one or more objects, and a sonar module configured to generate a 3D matrix based on the sonar return data including a plurality of sonar returns that are each defined by a 3D positional value, determine a group of the plurality of sonar returns associated with an object, assign a predetermined icon to the determined group, and generate and display 3D image of the sonar return data. The predetermined icon is positioned within the 3D image at a position that corresponds to the position of the determined group such that the position of the predetermined icon corresponds to the position of the object.

A sonar system is provided including a display screen, a transducer assembly including at least one transducer that is configured to emit one or more sonar signals into an underwater environment and receive sonar return data reflected from one or more objects, and a sonar module configured to generate a 3D matrix based on the sonar return data including a plurality of sonar returns that are each defined by a 3D positional value, determine a group of the plurality of sonar returns associated with an object, assign a predetermined icon to the determined group, and generate and display 3D image of the sonar return data. The predetermined icon is positioned within the 3D image at a position that corresponds to the position of the determined group such that the position of the predetermined icon corresponds to the position of the object.

One embodiment provides a method comprising acquiring, via one or more microphones of a device in a spatial area, a signal representing at least one echo of an ultrasound emitted via one or more loudspeakers of the device. The method further comprises applying digital signal processing to the signal to determine a signal-to-noise ratio (SNR) of the signal, and estimating one or more properties of a moving reflector in the spatial area based on the SNR of the signal.

One embodiment provides a method comprising acquiring, via one or more microphones of a device in a spatial area, a signal representing at least one echo of an ultrasound emitted via one or more loudspeakers of the device. The method further comprises applying digital signal processing to the signal to determine a signal-to-noise ratio (SNR) of the signal, and estimating one or more properties of a moving reflector in the spatial area based on the SNR of the signal.

In a method and system for inspecting the condition of a structure, the structure is scanned with a three-dimensional (3D) scanner. The 3D scanner includes a sensing system having one of a radar sensing device or an ultrasonic detection device. The sensing system detects 3D information about a subsurface of the structure, and the 3D scanner generates 3D data points based on the information detected by one or more of the radar sensing device and the ultrasonic detection device. A 3D model is constructed from the 3D data and is then analyzed to determine the condition of the subsurface of the structure.

In a method and system for inspecting the condition of a structure, the structure is scanned with a three-dimensional (3D) scanner. The 3D scanner includes a sensing system having one of a radar sensing device or an ultrasonic detection device. The sensing system detects 3D information about a subsurface of the structure, and the 3D scanner generates 3D data points based on the information detected by one or more of the radar sensing device and the ultrasonic detection device. A 3D model is constructed from the 3D data and is then analyzed to determine the condition of the subsurface of the structure.

An ultrasonic target, including a main reflector, the main reflector including three main faces, extending from a main vertex, the main faces forming a main trirectangular trihedron; defining a main base plane, lying facing the main vertex, and forming a base of the main trirectangular trihedron; the target including at least one auxiliary reflector fastened to the main reflector, the or each auxiliary reflector including three auxiliary faces, extending from an auxiliary vertex, the auxiliary faces forming an auxiliary trirectangular trihedron; defining an auxiliary base plane, lying facing the auxiliary vertex, and forming a base of the auxiliary trirectangular trihedron.

An ultrasonic target, including a main reflector, the main reflector including three main faces, extending from a main vertex, the main faces forming a main trirectangular trihedron; defining a main base plane, lying facing the main vertex, and forming a base of the main trirectangular trihedron; the target including at least one auxiliary reflector fastened to the main reflector, the or each auxiliary reflector including three auxiliary faces, extending from an auxiliary vertex, the auxiliary faces forming an auxiliary trirectangular trihedron; defining an auxiliary base plane, lying facing the auxiliary vertex, and forming a base of the auxiliary trirectangular trihedron.

A method for acoustic imaging includes emitting an acoustic signal. The method includes (a) emitting an acoustic signal; (b) detecting signals corresponding to reflections of the acoustic signal at an array of positions proximate a positon of the emitting; (c) adding, for a chosen distance from the position of the emitting, a respective time delay to each detected signal to cause each detected signal to correspond to each of a plurality of positions in a plane transverse to a line normal to a plane of the array of positions; (d) summing the time delayed signals; (e) selecting one of the plurality of positions having a highest summed, delayed signal amplitude; and (f) assigning a pixel to the one of the plurality of positions having the highest amplitude. (b) through (f) are repeated for a plurality of different chosen distances.

A method for recognizing a gesture made outside a vehicle includes setting a frequency of an ultrasound based on a thickness of a vehicle shell of the vehicle and an attenuation coefficient of the vehicle shell, emitting a plurality of ultrasounds having the frequency outwardly from an inner side of the vehicle shell, receiving a plurality of reflected waves returned by an obstacle reflecting the plurality of ultrasounds, determining whether the obstacle is a hand according to time differences between emission times of the plurality of ultrasounds and reception times of the plurality of reflected waves corresponding to the plurality of ultrasounds, and recognizing the gesture of the hand in response to determining that the obstacle is the hand.