Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
UNDERGROUND TRANSMISSION SYSTEM
Document Type and Number:
Japanese Patent JP3810990
Kind Code:
B
Abstract:

PROBLEM TO BE SOLVED: To provide an underground transmission system adopting a non-cut and cover method or the like, that can easily and quickly realize joining of rods and a low-cost drilling unit.
SOLUTION: The underground transmission system is provided with a transmitter (10), that transmits a frequency-modulation signal to underground, a receiver (20) that receives the frequency modulated signal sent from the transmitter (10) and propagated underground and demodulates the signal, and also with a waveform correction section (40) that corrects the amplitude of the signal demodulated by the receiver (20), depending on its frequency components.


More Like This:
JP2012047533LOCATOR
WO/2009/150432METHOD FOR SUBSURFACE ELECTROMAGNETIC SURVEYING USING TWO OR MORE SIMULTANEOUSLY ACTUATED ELECTROMAGNETIC SOURCES
JP2003004687METHOD FOR DETECTING DAMAGED LOCATION IN CORROSION-PROOF COATING OF EMBEDDED METAL PIPES USING TWO TYPE OF FREQUENCY SIGNAL
Inventors:
Ito, Yoshimasa
Nozu, Toshimitsu
Suzuki, Morio
Ishii, Makoto
Kushima, Kenji
Application Number:
JP2000000200056
Publication Date:
June 02, 2006
Filing Date:
June 28, 2000
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
KODEN ELECTRONICS CO LTD
International Classes:
G01V3/12; H04B13/02; G01S13/88; H04B7/005; H04L27/10; G01V3/12; H04B13/00; G01S13/00; H04B7/005; H04L27/10; (IPC1-7): H04B13/02; G01S13/88; G01V3/12; H04B7/005; H04L27/10



 
Previous Patent: COIL SPRING FORMING METHOD

Next Patent: CONTENTS DISTRIBUTION METHOD, SERVER AND RADIO CHANNEL CONTROLLER