Title:
ABNORMALITY DETECTING DEVICE, COMMUNICATION DEVICE, ABNORMALITY DETECTING METHOD, PROGRAM, AND RECORDING MEDIUM
Document Type and Number:
WIPO Patent Application WO/2018/097272
Kind Code:
A1
Abstract:
A computer calculates an amount of change from an observation start time in a total number of electrons in the ionosphere between an observation station on the ground and a satellite, on the basis of observed data of a signal received from the satellite by the observation station. The computer estimates the next calculated amount of change in the total number of electrons on the basis of a change over time in the amount of change in the total number of electrons in the ionosphere from the observation start time, and calculates a difference (estimation error) between the estimated amount of change in the total number of electrons and the actual calculated amount of change in the total number of electrons. The computer calculates a correlation value between the estimation error calculated for each observation station and the estimation error calculated for a certain number of observation stations in the vicinity of each observation station. If the correlation value calculated for each observation station is equal to or greater than a certain threshold, the computer determines that an abnormality has occurred in the ionosphere between the observation station and the satellite if the correlation value for the certain number of observation stations in the vicinity of said observation station is also equal to or greater than the certain threshold.
Inventors:
UMENO KEN (JP)
IWATA TAKUYA (JP)
IWATA TAKUYA (JP)
Application Number:
PCT/JP2017/042333
Publication Date:
May 31, 2018
Filing Date:
November 27, 2017
Export Citation:
Assignee:
UNIV KYOTO (JP)
International Classes:
G01V1/00
Foreign References:
| JP2005134316A | 2005-05-26 | |||
| JP2015518146A | 2015-06-25 |
Other References:
IWATA, TAKUYA ET AL.: "Correlation analysis for preseismic total electron content anomalies around the 2011 Tohoku-Oki earthquake", JOURNAL OF GEOPHYSICAL RESEARCH:SPACE PHYSICS, vol. 121, no. 9, 10 September 2016 (2016-09-10), pages 8969 - 8984, XP055605174
KOSUKE HEKI: "Ionospheric electron enhancement preceding the 2011 Tohoku-Oki earthquake", GEOPHYSICAL RESEARCH LETTERS, vol. 38, no. 17, 15 September 2011 (2011-09-15), pages L17312, XP055605177
KOSUKE HEKI: "Ionospheric electron enhancement preceding the 2011 Tohoku-Oki earthquake", GEOPHYSICAL RESEARCH LETTERS, vol. 38, no. 17, 15 September 2011 (2011-09-15), pages L17312, XP055605177
Attorney, Agent or Firm:
KOHNO, Hideto et al. (JP)
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