Resources Contact Us Home

Image Number 8 for United States Patent #7663974.

A fishfinder is provided for identifying with high precision a single fish under the ship and for measuring the length of the fish precisely. An operator of the fishfinder is assisted to grasp the depth and the length of the fish. A fishfinder transmits an ultrasound pulse having a high carrier frequency and an ultrasound pulse having a low carrier frequency by means of a pulse transmission and reception device at predetermined time intervals. A single fish echo is determined and tracked for a plurality of transmission intervals of ultrasound pulses emitted into the water. A target strength of single fish is measured based on the signal strength of a low carrier frequency echo signal from the single fish. The length of the fish is measured based on the target strength. A fish mark is displayed on the screen of an indicator, with the size of the fish mark depending on the fish length.

  Recently Added Patents
Hydrothermal synthesis of nanocubes of sillenite type compounds for photovoltaic applications and solar energy conversion of carbon dioxide to fuels
VEGF-specific capture agents, compositions, and methods of using and making
Avalanche photodiodes having accurate and reproductible amplification layer
Digital camera supporting intelligent self-timer mode and method of controlling the same
Semiconductor memory device, test circuit, and test operation method thereof
Clothing fastener accessory
Sheet member and method of manufacturing sheet member
  Randomly Featured Patents
Wireless communication system, transmitting device and receiving device
Method and system for transmitting digital signals between nodes of a network for optimized processing at the receiving node
Image forming device having a sensor with two separate distinguishable triggers
Queuing connector to promote message servicing
Notched golf club face
Clamp type electrical multimeter (II)
Data compression/decompression and storage of compressed and uncompressed data on a same removable data storage medium
Color stable anticalculus compostion
Method of manufacturing semiconductor device
Inspection equipment of circuit board and inspection method of circuit board