Ultrasonic wave transmitting and receiving system for...

Details Ultrasonic wave transmitting and receiving system for... Ultrasonic wave transmitting and receiving system for...

2004-04-16

2008-12-02

Pihulic, Dan (Department: 3662)

Communications, electrical: acoustic wave systems and devices

Transponders

Reexamination Certificate

active

07460433

ABSTRACT:
A trawl net (2) is attached to ends of warps (4) extending from a ship (6), such as a trawl boat, in the sternward direction, and a transponder (5) to transmit a response signal is attached to an upper part of a net mouth of the trawl net (2). The ship (6) forms a transmission beam TB of a detection signal by a transducer (1) at the bottom of the ship, and performs detection in the detection range. The transponder (5) receives the detection signal, and forms a transmission beam TPB of a frequency different from that. A detection image and a position display image of the transponder are superposed and displayed on a display of a scanning sonar or are displayed side by side.

REFERENCES:
patent: 5377163 (1994-12-01), Simpson
patent: 2006/0236770 (2006-10-01), Nishimori et al.
patent: 59-046876 (1984-03-01), None
patent: 60-8883 (1985-01-01), None
patent: 60-33074 (1985-02-01), None
patent: 63-52715 (1988-10-01), None
patent: 1-12220 (1989-04-01), None
patent: 3-16072 (1991-04-01), None
patent: 2003-185746 (2003-07-01), None

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