A method, device and computer program product for controlling the device by tracking a movement of a hand or other objects. The device receives acoustic signals. At least a portion of the received signals are transformed into two-dimensional sinusoids whose frequencies are proportional to an angle-of-arrival (AoA) and a propagation distance of the reflected signals. An AoA-distance profile is derived based on signals received from the object by evaluating frequencies of the two-dimensional sinusoids. Then, an AoA-distance pair is derived from the AoA-distance profile. A current location of the object is determined based on the estimated AoA-distance pair. The device then performs a command in response to detecting that the user moved to perform the command based on prior and current locations of the object.

The techniques and systems herein enable target-velocity estimation using position variance. Specifically, a plurality of detections of a target are received for respective times as the target moves relative to a host vehicle. Based on the detections, two-dimensional positions of the target relative to the host vehicle are determined for the respective times. Based on the positions of the target at the respective times, a first variance is determined for a first dimension of the positions, and a second variance is determined for a second dimension of the positions. Based on the first and second variances, an estimated velocity of the target is calculated. By basing the estimated velocity on the variances of the positions, more-accurate estimated velocities may be generated sooner, thus enabling better performance of downstream operations.

An arithmetic device includes: an input unit to which information pertaining to a detection target that is a target recognized by a sensor is input from the sensor; a processing-unit allocation unit that is configured to allocate a plurality of the targets to any one of a plurality of groups; an association unit that is configured to retrieve a second one of the targets to be associated with a first one of the targets from a part of the plurality of groups included in the plurality of groups; and a state fusion unit that is configured to fuse the first target and the second target that have been associated with each other by the association unit to produce a tracking target that is a target being tracked. The first target is any one of the detection target and the tracking target. The second target is any one of the detection target and the tracking target.

In order to acquire echo sound information about a long-distance target, an active sonar comprises a fan beam transmitter, a fan beam receiver, a propagation path calculator, a path time calculator, and a horizontal distance calculator. The active sonar transmits a plurality of transmitted fan beams horizontally wide and vertically narrow, and the elevation angles of them are mutually deferent, and receives received fan beams vertically wide and horizontally narrow. The propagation path calculator calculates a propagation path of each of the transmitted fan beams based on the profile of medium and the elevation angle of the transmission. The path time calculator calculates a path time which is the time period from the transmission to the reception. The horizontal distance calculator calculates a horizontal distance from the active sonar to a generation source point of each echo sounds based on the propagation path and the path time.

In order to acquire echo sound information about a long-distance target, an active sonar comprises a fan beam transmitter, a fan beam receiver, a propagation path calculator, a path time calculator, and a horizontal distance calculator. The active sonar transmits a plurality of transmitted fan beams horizontally wide and vertically narrow, and the elevation angles of them are mutually deferent, and receives received fan beams vertically wide and horizontally narrow. The propagation path calculator calculates a propagation path of each of the transmitted fan beams based on the profile of medium and the elevation angle of the transmission. The path time calculator calculates a path time which is the time period from the transmission to the reception. The horizontal distance calculator calculates a horizontal distance from the active sonar to a generation source point of each echo sounds based on the propagation path and the path time.

A position determining device and an operating method thereof are disclosed. According to the present invention, a position of a neighboring vehicle is determined by using the differences of the receiving time and strengths between two sensing signals received from two ultrasound sensors installed in a vehicle. Therefore, it is possible to estimate a position and a moving path for neighboring vehicles while driving a vehicle.

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 system for producing tactile stimulation includes a processing subsystem. Additionally or alternatively, the system can include a tactile device, input devices, and/or any other suitable components. A method for providing tactile stimulation includes receiving a set of waveform signals associated with a set of transducers; assigning a set of waveform parameters to the set of transducers based on the set of waveform signals; and controlling the set of transducers based on the set of waveform parameters. Additionally or alternatively, the method can include organizing the waveform signals into a set of groupings and/or any other suitable processes.

A system for producing tactile stimulation includes a processing subsystem. Additionally or alternatively, the system can include a tactile device, input devices, and/or any other suitable components. A method for providing tactile stimulation includes receiving a set of waveform signals associated with a set of transducers; assigning a set of waveform parameters to the set of transducers based on the set of waveform signals; and controlling the set of transducers based on the set of waveform parameters. Additionally or alternatively, the method can include organizing the waveform signals into a set of groupings and/or any other suitable processes.

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.