JPS56137266A - Automatic detector for magnetic abnormality - Google Patents

Automatic detector for magnetic abnormality

Info

Publication number
JPS56137266A
JPS56137266A JP4135080A JP4135080A JPS56137266A JP S56137266 A JPS56137266 A JP S56137266A JP 4135080 A JP4135080 A JP 4135080A JP 4135080 A JP4135080 A JP 4135080A JP S56137266 A JPS56137266 A JP S56137266A
Authority
JP
Japan
Prior art keywords
haar
measuring signal
function
magnetic field
field measuring
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
JP4135080A
Other languages
Japanese (ja)
Other versions
JPS6024430B2 (en
Inventor
Naoyuki Tojo
Yasuo Tachibana
Takashi Fujisawa
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP55041350A priority Critical patent/JPS6024430B2/en
Publication of JPS56137266A publication Critical patent/JPS56137266A/en
Publication of JPS6024430B2 publication Critical patent/JPS6024430B2/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
    • G01V3/081—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices the magnetic field is produced by the objects or geological structures

Abstract

PURPOSE:To automatically detect the abnormal magnetism due to a sunken vessel or the like by a method wherein the magnetic field measuring signal is normalized, then a Haar characteristic extracting function is obtained by a Haar converter or the like, and the amplitude value of said function is discriminated. CONSTITUTION:The magnetic field measuring signal SGNL from a magnetic abnormality detector is converted into a digital signal and then normalized in time in a running average processing unit 2 by calculating a representative value X every number N outputted from a running average section calculating unit 1 in response to the height measuring signal HIGT of an airplane or the like equipped with a detector. Said X is calculated in a high-speed Haar converter 3 to obtain a Haar spectrum HSP, and a proper calculation is moreover performed to obtain a Haar characteristic extracting function. Whether or not the time needed for the amplitude value of said function to exceed the first threshold value exceeds the second threshold value is discriminated in a discriminating unit 5 to output a last discriminating signal LAST in order to decide whether the magnetic field measuring signal war obtained from a sunken vessel or noises.
JP55041350A 1980-03-31 1980-03-31 Anomaly automatic detector Expired JPS6024430B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55041350A JPS6024430B2 (en) 1980-03-31 1980-03-31 Anomaly automatic detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55041350A JPS6024430B2 (en) 1980-03-31 1980-03-31 Anomaly automatic detector

Publications (2)

Publication Number Publication Date
JPS56137266A true JPS56137266A (en) 1981-10-27
JPS6024430B2 JPS6024430B2 (en) 1985-06-12

Family

ID=12606055

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55041350A Expired JPS6024430B2 (en) 1980-03-31 1980-03-31 Anomaly automatic detector

Country Status (1)

Country Link
JP (1) JPS6024430B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3875977A1 (en) * 2020-03-03 2021-09-08 Shimadzu Corporation Magnetic detection system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109425894A (en) * 2017-08-23 2019-03-05 中国石油化工股份有限公司 A kind of seismic anomaly road detection method and device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3875977A1 (en) * 2020-03-03 2021-09-08 Shimadzu Corporation Magnetic detection system
US11698273B2 (en) 2020-03-03 2023-07-11 Shimadzu Corporation Magnetic detection system

Also Published As

Publication number Publication date
JPS6024430B2 (en) 1985-06-12

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