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
Liquid low temperature injection molding process
Flip flop shoe
Method and system for reduction of decoding complexity in a communication system
Petunia plant named `Bartpet001`
Apparatus and method for controlling a tunable matching network in a wireless network
Cache memory control device, semiconductor integrated circuit, and cache memory control method
  Randomly Featured Patents
Silver halide photographic emulsion
Exhaust manifold and an improved exhaust manifold, intake manifold and engine combination
Halogen-free flameproof thermoplastic molding materials
Coated fabric containing recycled material and method for manufacturing same
Method of pixel averaging in a video processing apparatus
Carton aligner for two-way diverter
Voltage controlled oscillator with controlled capacitance ratio in positive feedback loop to broaden bandwidth
Clarifier with sludge dewatering
Embedded system administration and method therefor
Computer system memory management