Furuno Electric Company Limited

Kenichi Watanabe

Yasunobu Asada

Shinji Ogawa

Yasushi Nishimori

Koji Tokuda

Kouzo Tokuyama

Ryouichi Suetoshi

A transceiving device includes a transmission signal generating module for generating a transmission signal that is frequency-modulated by a predetermined frequency sweep width, a transceiver module for transmitting a pulse signal having substantially the same waveform as a waveform of the transmission signal and receiving an echo signal corresponding to the transmission signal from a detection range, and a pulse-compression filter for pulse-compressing the echo signal received by the transceiver module. The pulse-compression filter has an input/output characteristic. The characteristic has, when the pulse-compression filter is inputted with an input signal having substantially the same waveform as the waveform of the transmission signal, a window function shape such that a phase spectrum of an output signal corresponding to the input signal is linear and an amplitude spectrum of the output signal does not have a frequency component other than a frequency band with which a frequency sweep is carried out.

Transceiving device of pulse signal

A pulse signal transmitting/receiving device is provided. The device includes a signal generating module for generating a transmitting signal including an amplitude-modulated chirp signal, and a reference signal including a chirp signal having a frequency that changes similarly to that of the transmitting signal, a transmitting module for transmitting a pulse having approximately the same waveform as that of the transmitting signal, a receiving module for receiving an echo signal that is the transmitting pulse reflected from a detection target object, a compensating module for extending a dynamic range of the echo signal received by the receiving module, and a pulse compressing module for outputting a pulse-compressed echo signal, wherein the pulse compression is performed by a correlation calculation between the echo signal having the dynamic range extended by the compensating module, and the reference signal.

Device and method for transmitting/receiving pulse signal

An acoustic transducerhas a first cylindrical portionA and a second hemispherical portionB on which a plurality of transducer elementsare arranged. The transducer elements on the cylindrical portion are arranged to have six nearest neighbors. The arrangement may be such that the six transducer elements surrounding a given element describe the vertices of a regular hexagon. The hexagons thus described may be aligned so that two of their sides are parallel to the axis of the cylinder. The elements on the hemispherical portion may be arranged so that some elements have five nearest neighbors and others have six (the neighboring elements describing, for example, the vertices of hexagons and pentagons respectively). An underwater sounding apparatus may be constructed using the transducer.

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Nishinomiya, Japan

Kenichi Watanabe