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
Solid-state imaging device and imaging apparatus
Non-aqueous electrolyte battery
Compositions for inhibiting NADPH oxidase activity
Business card assembly
Method for using directing cells for specific stem/progenitor cell activation and differentiation
Imaging lens having five lens elements, and electronic apparatus having the same
3D image generating method, 3D animation generating method, and both 3D image generating module and 3D animation generating module thereof
  Randomly Featured Patents
Pesticide compositions
System and method for reconciling billing mismatch
Machining head for machining boards
Construction of elliptical metal substrates
Sheet feeding apparatus and image forming apparatus and image reading apparatus provided with same
Control system for an exhaust gas sensor
Process for photo-assisted epitaxial growth using remote plasma with in-situ etching
Facial recognition
Combined disc player, radio receiver and clock
Methods of using phenolic guanidine sodium channel blockers