Furuno Electric Company Limited

Itsuo Fukuoka

Hideharu Morimatsu

Yoshinari Yoshida

Masajiro Iida

Tatsuo Hayashi

Satoru Arakane

Yasunobu Asada

Yasushi Nishimori

Satoshi Misonoo

Hiroshi Iino

Takashi Yoshioka

Mitsuhiro Inouchi

Masaru Nishida

Shinji Ogawa

Yasuo Ito

Masato Kawai

The present disclosure provides an underwater detector including a power source for applying a predetermined voltage, a voltage control circuit for controlling the voltage based on a control signal, a gate signal generating module for outputting a gate signal, a switching circuit for outputting a reference signal based on the voltage controlled by the voltage control circuit and the gate signal outputted from the gate signal generating module, and a transducer for transmitting an ultrasonic signal underwater, an envelope of which being controlled based on a waveform of the control signal by being applied with the reference signal.

Ultrasonic underwater detector with voltage and envelope control

A transducer is constructed of a plurality of transducer elements which are arranged in multiple layers and columns forming as a whole a generally cylindrical shape. A scanning sonar employing the transducer thus constructed can be switched between horizontal scan mode in which a vertically focused beam having a narrow horizontal beam angle (high horizontal directivity) is steered around the transducer using all the transducer elements and vertical scan mode in which a horizontally focused beam having a narrow vertical beam angle (high vertical directivity) is steered in a vertical plane directed in a specified scan azimuth to find out the angle of incidence of a received signal. The horizontally focused beam is formed by using the transducer elements of specific columns centered on the specified scan azimuth. A vertical scan signal obtained in the vertical scan mode is multiplied by a chirp signal. A correlator provided in a succeeding stage converts the amount of Doppler shift into time data and determines the angle of incidence of the received signal.

Device for and a method of determining the angle of incidence of a received signal and a scanning sonar

Underwater detection system for determining carrier frequencies of

A scanning sonar system for detecting objects and displaying them on a circular screen and producing audible signals coordinated with the visual signals indicating the detection of an object.

Ultrasonic detection system

An ultrasonic detection system which includes means for the transmission of signals in all directions, a circular array of transducers arranged at uniform intervals, means for producing output signals from spaced transducers and then sequentially combining outputs from sets of adjoining transducers to produce a plurality of received signals for display on indicating means.

A plan position indicating system which includes a display screen and means for indicating on the screen the tilt angle of the transmitted beam and received signals to enable measurement not only of direction and distance but also the horizontal and vertical components thereof.

Indication device in plan position indication system

Apparatus for controlling the angular direction of wave transmission of an ultrasonic transmitting system having a plurality of uniformly spaced transducers which includes means for successively shifting the phase of the signals emitted by each transducer and providing means for controlling the magnitude of the phase shift to alter the angle of transmission.

Growing community of inventors

Nishinomiya, Japan

Itsuo Fukuoka