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
Cryptographically generated addresses using backward key chain for secure route optimization in mobile internet protocol
Systems and methods for building axes, co-axes and paleo-geographic coordinates related to a stratified geological volume
Electronic device including predicted frequency error estimation of a voltage controlled oscillator and related methods
Method for producing carrier on which microorganisms capable of conducting multiple parallel mineralization are immobilized, column reactor and solid medium for cultivating plants
System and method for hybrid risk modeling of turbomachinery
Determining system for localization methods combination
Spark plug
  Randomly Featured Patents
Integral latching arm
Biotinylation of proteins
Compartment adaptor assembly for receiving an alternate sized battery into night vision goggles
Tapered fiber gratings and applications
Paint roller frame with an adjustable handle
Wafer clamping apparatus and method for operating the same
Method for forming a liquid film on a substrate
Mixing device
Kanamycin resistance gene derived from microorganisms of the genus rhodococcus