There is provided an obstacle detection system using distance sensors including a first distance sensor which is mounted in a vehicle and senses a distance to the obstacle positioned inside a first field of view; a second distance sensor which is mounted in the vehicle to be spaced apart from the first distance sensor in the lateral direction of the vehicle and senses the distance to the obstacle positioned in a second field of view overlapping with the first field of view partially; an auxiliary sensor which is mounted in the vehicle between the first distance sensor and the second distance in the lateral direction of the vehicle and senses presence or absence of, or the distance to, the obstacle at least partially positioned with an overlapping field where the first field of view and the second field of view overlap with each other; and a detection unit detecting the obstacle based on the distances to the obstacle respectively sensed by the first distance sensor and the second distance sensor and the presence or absence, or the distance to the obstacle sensed by the auxiliary sensor.

An object detector includes: a triangulation calculation unit that performs triangulation calculation for detecting a location of an object based on first distance information calculated based on direct waves in which transmitted waves transmitted from a first transmission and reception unit are reflected by an object and received by the first transmission and reception unit, and second distance information calculated based on indirect waves in which transmitted waves transmitted from a second transmission and reception unit arranged in a location different from the first transmission and reception unit are reflected by an object and received by the first transmission and reception unit; and a prohibition processing unit that prohibits triangulation calculation when a difference between first velocity information indicating a velocity of an object calculated based on the direct waves and second velocity information indicating a velocity of an object calculated based on the indirect waves exceeds a predetermined range.

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.

Disclosed is a method and system for diffraction-aware non-line of sight (NLOS) sound source localization (SSL) that may reconstruct an indoor space, may generate acoustic rays into the indoor space based on an audio signal collected from the indoor space, and may estimate a position of an NLOS sound source based on a point at which one of the acoustic rays is diffracted.

A target positioning device and method based on a plecotus auritus double-pinna bionic sonar. An echo positioning device based on bionic pinnae of a bat can determine an azimuth and an elevation of a target to locate the spatial location of the target by using echoes obtained by two array elements, resolving a problem that two array element antennas cannot locate the space coordinates. In a positioning method based on bionic pinnae of a bat according to filtering characteristics of bat ears, a method for estimating a spatial location by a neural network is used, and a pulse string estimation method is used to reduce the error of estimated angles, to obtain a precise azimuth and elevation.

An apparatus determines a spatial position of an audio source in multi moving audio sources scenarios. The apparatus receives audio signal versions as local sound waves. The apparatus determines first and second probabilities for a direction of arrival of the audio signal version based on the audio signal versions received within a first time interval; determines third and fourth probabilities for the direction of arrival of the audio signal version based on the audio signal versions received within a second time interval; determines a first probability difference between the first and third probabilities; determines a second probability difference between the second and fourth probabilities; combines the third probability and the first probability difference to obtain an updated third probability; combines the fourth probability with the second probability difference to obtain an updated fourth probability; and determines the spatial position based on the updated third and fourth probabilities.

A method for checking the positioning of an ultrasonic sensor installed in a mounting on the vehicle is disclosed. The method involves localizing a reference object in the detection region of the ultrasonic sensor, emitting at least one first ultrasonic pulse with a first ultrasonic frequency, receiving at least one first echo signal at the first ultrasonic frequency, emitting at least one second ultrasonic pulse with a second ultrasonic frequency, receiving at least one second echo signal at the second ultrasonic frequency, ascertaining the ratio of echo amplitudes of the reference object in the at least one first and second echo signal, and outputting an incorrect positioning of the ultrasonic sensor if the ratio of echo amplitudes in the reference object in the at least one first and second echo signal deviates from the ratio for a correct positioning of the ultrasonic sensor by at least one specified threshold.

An object detection apparatus is mounted to a moving body to which a plurality of distance measurement sensors are mounted, and detects an object that is present in a vicinity of the moving body. In response to direct waves and indirect waves being received, the object detection apparatus acquires a relative position of an object to a moving body based on principles of triangulation using distance measurement information based on the direct waves and distance measurement information based on the indirect waves. In response to the received waves being reflected waves from an object of which the relative position has been already acquired and only either of the direct waves and the indirect waves being received as received waves, the object detection apparatus estimates the relative position of the object to the moving body based on a reference position that is the relative position that has been already acquired.

The invention relates to ultrasound imaging method and apparatus suitable for minimally invasive ultrasound diagnostic devices in cardiac ablation monitoring and in tumor ablation monitoring. The present invention proposes an assembly of forward and side-facing transducers and a system of embedded forward and side-facing transducers in apertures on surfaces of the assembly. This provides control of the acoustic properties of the transducer and improved ablation monitoring when the assembly is incorporated in a medical device. FIG. 10

An ultrasonic measuring method involves activating an ultrasonic transceiver at a multiplicity of transmission/reception positions along a lateral direction to transmit a respective transmission signal in a transverse direction and receive a respective received signal waveform. Echo signals in the respective received signal waveform are identified and a set of reflection points are formed by trilaterating a respective reflection point multiple times based on two respective received signal waveforms and a respective echo signal from each of the two received signal waveforms. Multiple pairs made of a primary reflection point and a secondary reflection point are formed, identified on the basis of a position-based criterion as reflection points of a direct and/or indirect reflection from the same object section. An object height at one of the reflection points is characterized as high or low.