A collision avoidance system is provided with: a rear detection device arranged in a host vehicle and capable of detecting an object directly behind the host vehicle, an object to the rear-right of the host vehicle, and an object to the rear-left of the host vehicle in a non-contact manner. A computation processing unit outputs, on the basis of a detection result from the rear detection device, the presence/absence of the possibility of a collision between the host vehicle and: a first following vehicle approaching the host vehicle from directly behind, a second following vehicle approaching the host vehicle from the rear-right, and a third following vehicle approaching the host vehicle from the rear-left. A warning device generates warnings when there is the possibility of a collision with the first, second or third following vehicles.

An object detection apparatus is arranged to detect the distance to the object and includes: a transceiver repeatedly transmitting a wave as an ultrasonic wave and receives a reflection wave of the transmission wave; a transmission controller controlling the transceiver to transmit the transmission wave; a distance calculator calculating a distance to the object, based on a time interval from a moment when the transceiver transmits the wave to a moment when the reflection wave is received; and a transmission timing controller controlling timing at which the transmission controller controls the transmission wave to be transmitted. Moreover, the transmission timing controller inserts at least one type of temporary waiting time between a transmission/reception period in which the transceiver transmits the transmission wave and receives the reflection wave and a next transmission/reception period, when a predetermined crosstalk identification condition is established based on the distance to the object.

Systems and techniques are described that provide automated parking assistance for a vehicle. In some implementations, a parking assistance apparatus includes a frequency generator configured to generate a first frequency and a second frequency, and generate at least one synthesized frequency that is synthesized from the first frequency and the second frequency. The apparatus also includes a piezoelectric converter configured to, using piezoelectric effects, transmit ultrasonic waves having the at least one synthesized frequency, and receive reflected ultrasonic waves that result from the transmitted ultrasonic waves being reflected by an object. The apparatus also includes a filter unit configured to detect a predetermined frequency from the reflected ultrasonic waves.

Systems and techniques are described that provide automated parking assistance for a vehicle. In some implementations, a parking assistance apparatus includes a frequency generator configured to generate a first frequency and a second frequency, and generate at least one synthesized frequency that is synthesized from the first frequency and the second frequency. The apparatus also includes a piezoelectric converter configured to, using piezoelectric effects, transmit ultrasonic waves having the at least one synthesized frequency, and receive reflected ultrasonic waves that result from the transmitted ultrasonic waves being reflected by an object. The apparatus also includes a filter unit configured to detect a predetermined frequency from the reflected ultrasonic waves.

A robot cleaner having a main body, a driving unit for moving the main body, a sensing unit for sensing information related to an obstacle, and a controller for controlling the driving unit to prevent collision of the main body with the obstacle. The controller controls the driving unit to reverse the main body with respect to the obstacle so as to prevent the main body from contacting the obstacle based on a distance between the main body and the obstacle.

An object detection device of the present disclosure includes three reception units for receiving reflected waves resulting from reflection of a transmission wave by an object within a detection range, and a determination unit for determining presence or absence of an object to be avoided based on outputs of the three reception units. The determination unit calculates first coordinates and second coordinates at which an object is estimated to be present, based on reception times from when a transmission wave is transmitted until reflected waves are received by the three reception units, and determines whether or not the object needs to be avoided, based on a distance between the first coordinates and the second coordinates.

Techniques are disclosed for systems and methods to provide networkable sonar systems for mobile structures. A networkable sonar system includes a transducer module and associated sonar electronics and optionally orientation and/or position sensors and/or other sensors disposed substantially within the housing of a sonar transducer assembly, which is coupled to one or more user interfaces and/or other sonar systems over an Ethernet connection. The sonar transducer assembly may be configured to support and protect the transducer module and the sonar electronics and sensors, to physically and/or adjustably couple to a mobile structure, and/or to provide a simplified interface to other systems coupled to the mobile structure. Resulting sonar data and/or imagery may be transmitted over the Ethernet connection and displayed to a user and/or used to adjust various operational systems of the mobile structure.

Techniques are disclosed for systems and methods to provide networkable sonar systems for mobile structures. A networkable sonar system includes a transducer module and associated sonar electronics and optionally orientation and/or position sensors and/or other sensors disposed substantially within the housing of a sonar transducer assembly, which is coupled to one or more user interfaces and/or other sonar systems over an Ethernet connection. The sonar transducer assembly may be configured to support and protect the transducer module and the sonar electronics and sensors, to physically and/or adjustably couple to a mobile structure, and/or to provide a simplified interface to other systems coupled to the mobile structure. Resulting sonar data and/or imagery may be transmitted over the Ethernet connection and displayed to a user and/or used to adjust various operational systems of the mobile structure.

Systems and methods for boosting low content of received signals involve a vessel (102) towing port side (205) and starboard side (210) impulsive source arrays. The port side and starboard side impulsive source arrays are selectively actuated for a plurality of sequential shots having different signatures.

An object detection device equipped at a predetermined height includes a waveform obtaining portion obtaining a wave height value of a reflected wave, a reference value calculation portion calculating a wave height value of a wave reflected from a reference obstacle present at the predetermined height as reference value, a detection value calculation portion calculating a wave height value of a wave reflected from a detection object as detection value, a reference distance calculation portion calculating a reference distance between the reference obstacle and the distance measuring sensor, a detection distance calculation portion calculating a detection distance between the detection object and the distance measuring sensor, a correction portion correcting the reference value and the detection value, and a height calculation portion calculating a height of the detection object relative to the predetermined height according to a relative comparison result of the corrected reference value and the corrected detection value.