CA2202638A1 - System and method for earth probing with deep subsurface penetration using low frequency electromagnetic signals - Google Patents

System and method for earth probing with deep subsurface penetration using low frequency electromagnetic signals

Info

Publication number
CA2202638A1
CA2202638A1 CA2202638A CA2202638A CA2202638A1 CA 2202638 A1 CA2202638 A1 CA 2202638A1 CA 2202638 A CA2202638 A CA 2202638A CA 2202638 A CA2202638 A CA 2202638A CA 2202638 A1 CA2202638 A1 CA 2202638A1
Authority
CA
Canada
Prior art keywords
antenna
soil
low frequency
electromagnetic signals
frequency electromagnetic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2202638A
Other languages
French (fr)
Other versions
CA2202638C (en
Inventor
Paul Van Etten
Russell D. Brown
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CA002202638A priority Critical patent/CA2202638C/en
Priority claimed from PCT/US1994/011769 external-priority patent/WO1996012200A1/en
Publication of CA2202638A1 publication Critical patent/CA2202638A1/en
Application granted granted Critical
Publication of CA2202638C publication Critical patent/CA2202638C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/28—Details of pulse systems
    • G01S7/285—Receivers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/06—Systems determining position data of a target
    • G01S13/08—Systems for measuring distance only
    • G01S13/10—Systems for measuring distance only using transmission of interrupted, pulse modulated waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/12—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electromagnetic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/38—Processing data, e.g. for analysis, for interpretation, for correction

Landscapes

  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geophysics (AREA)
  • Electromagnetism (AREA)
  • Geology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

An earth probing system uses deep penetration of electromagnetic waves into soil and other media. Advantage is taken of lower attenuation of radar waves in soil by frequencies of about three megahertz or less. Bursts of electromagnetic energy of various frequencies in this range are consecutively transmitted. The transmitting antenna (118) is continuously tuned, so as to maintain resonance during each burst, allowing large circulating currents and high power output. In a receiving antenna system, a dual antenna arrangement (111, 112) is providing for obtaining improved reception. A corresponding dual antenna circuit employs "spatial notch filtering", automatic adjustment of antenna gain-frequency variations, as well as compensation for transmitter gain variation. The system may be implemented in a totally analog, totally digital, or hybrid manner. Preferably, a signal processing method detects and digitally samples signals reflected from subsurface layers and buried objects (316, 316'). The invention provides means for removing system distortions and interfering signals, for compensating for aliasing errors and frequency-dependent antenna gain and phase variations, and for avoiding masking errors introduced by strong reflections.
CA002202638A 1994-10-17 1994-10-17 System and method for earth probing with deep subsurface penetration using low frequency electromagnetic signals Expired - Fee Related CA2202638C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA002202638A CA2202638C (en) 1994-10-17 1994-10-17 System and method for earth probing with deep subsurface penetration using low frequency electromagnetic signals

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA002202638A CA2202638C (en) 1994-10-17 1994-10-17 System and method for earth probing with deep subsurface penetration using low frequency electromagnetic signals
PCT/US1994/011769 WO1996012200A1 (en) 1993-04-02 1994-10-17 System and method for earth probing with deep subsurface penetration using low frequency electromagnetic signals

Publications (2)

Publication Number Publication Date
CA2202638A1 true CA2202638A1 (en) 1996-04-25
CA2202638C CA2202638C (en) 1999-08-31

Family

ID=29421079

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002202638A Expired - Fee Related CA2202638C (en) 1994-10-17 1994-10-17 System and method for earth probing with deep subsurface penetration using low frequency electromagnetic signals

Country Status (1)

Country Link
CA (1) CA2202638C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112649882A (en) * 2020-12-08 2021-04-13 北京自动化控制设备研究所 Low-frequency magnetic signal enhancement method and aviation magnetic measurement system using same
CN115790673A (en) * 2023-02-06 2023-03-14 国机传感科技有限公司 Extremely-low-frequency electromagnetic wave bidirectional magnetic sensing device and method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112649882A (en) * 2020-12-08 2021-04-13 北京自动化控制设备研究所 Low-frequency magnetic signal enhancement method and aviation magnetic measurement system using same
CN112649882B (en) * 2020-12-08 2022-07-15 北京自动化控制设备研究所 Low-frequency magnetic signal enhancement method and aviation magnetic measurement system using same
CN115790673A (en) * 2023-02-06 2023-03-14 国机传感科技有限公司 Extremely-low-frequency electromagnetic wave bidirectional magnetic sensing device and method

Also Published As

Publication number Publication date
CA2202638C (en) 1999-08-31

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed
MKLA Lapsed

Effective date: 20011017