Resources Contact Us Home
Method of operating a continuous wave sonar system

Image Number 3 for United States Patent #6128249.

An improved method is provided for operating a continuous wave sonar syst At time of transmission, a plurality of acoustic pulses are transmitted one right after another. Each pulse has a unique frequency and is of a time duration that is approximately one second long. The pulses are characterized by a separation frequency representing a difference in frequency between numerically successive frequencies. However, the pulses are staggered with respect to frequency. In the preferred embodiment, each successively transmitted one of the pulses is separated in frequency from an immediately preceding transmitted one of the pulses by an amount greater than the separation frequency. These multiple pulses seperated in time and in frequency, reduce the effects of frequency speading caused by the medium, resulting in a sonar with enhanced detection performance.

  Recently Added Patents
Information storage medium, reproducing method, and recording method
Printed circuit board unit having routing unit mounted thereon and computer device having the same
Copolymer for positive type lithography, polymerization initiator used in production of said copolymer, and composition for semiconductor lithography
Organic light emitting display apparatus
Illuminating device
Light barrier and method for detecting objects
Information-provision control method, information reproduction system, information-provision apparatus, information reproduction apparatus and information-presentation control program
  Randomly Featured Patents
Method and apparatus to detect a dead pixel of an image sensor and method and apparatus to capture an image from an image sensor
Piston and spring powered engine
Single-photon watch dog detector for folded quantum key distribution system
Apparatus and method for double clutch actuator
High-frequency bipolar transistor and method for the production thereof
Method of collecting and handling recycleable paper
Learning A* priority function from unlabeled data
Micromachined infrared sensitive pixel and infrared imager including same
Dry transfer materials
Surface acoustic wave filter element, surface acoustic wave filter and communication device using the same