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
Color variation control process for molding plastic and composite multi-color articles
Bread basket
Method and apparatus for generating soft bit values in reduced-state equalizers
HSP20 inhibits amyloidogenesis and neurotoxicity
Apparatus and method for performing lawful intercept in group calls
Voltage level shift circuits and methods
Scoring records for sorting by user-specific weights based on relative importance
  Randomly Featured Patents
Plants and seeds of corn variety CV609128
Semiconductor device having a gate electrode of polycrystal layer and a method of manufacturing thereof
Predictive coding device capable of coding image data signals without a discontinuity among blocks
Systems and methods for determining the location of a request on a content delivery network
Electricity transfer station
Application platform
Method of and apparatus for thermographic identification of parts
Method and apparatus for analysis of schlieren
Tank carrier and manipulator
Tire shredding machine