US 7,460,433 B2Granted

Ultrasonic wave transmitting and receiving system for detecting underwater objects

AssigneeFuruno Electric Co., Ltd.

InventorsYasushi Nishimori, Akira Okunishi, Kouzo Tokuyama, Koji Yokuda

Life of this patent

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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.

Claims3

Dependent claims

An ultrasonic transmitting and receiving system comprising:

a sonar apparatus equipped on a ship and detecting underwater objects by a transmission beam formed with a detection signal and at least a reception beam formed with echo signals;
and
a transponder in water, the transponder transmitting a response signal having a frequency band different from a frequency band of the detection signal in response to an activation signal transmitted from the sonar apparatus and received thereby, the activation signal having a frequency band different from the frequency band of the detection signal;
and
wherein the sonar apparatus includes:
a transmission beam former for transmitting the detection signal in a form of transmission beam, the transmission beam former having sections for separately forming the transmission beam of the detection signal to a detection range and a transmission beam of the activation signal to the transponder,
a reception beam former for receiving an echo signal produced by an object reflecting the detection signal and the response signal, and
an indicator for displaying the echo signal and the response signal;
and
wherein the transmission beam former forms the transmission beam of the activation signal to the transponder according to an azimuth from the sonar to the transponder or a tilt angle.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/554,995Filed 16 Apr 2004
Priority: JP 2003-1319869 May 2003
Published: US 2006/0236770 A126 Oct 2006
Granted: 2 Dec 2008
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

G01S 15/87
Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems: combinations of sonar systems
G01S 15/96
Sonar systems specially adapted for specific applications: for locating fish
G01S 7/62
Display arrangements: cathode-ray tube displays
G01S
Radio direction-finding