Data processing device, data processing method, and computer readable medium

A data processing device comprising:

• processing circuitry
• to estimate as an estimated purely-lateral position, when generation of a disturbance wave to disturb communication performed in a train is detected while the train is traveling, a position on a traveling track of the train, existing in a purely-lateral direction of a position of a generation source of the disturbance wave;
• to extract a feature of a measured reception power value which is a reception power value measured in the train during a disturbance wave generation period being a period wherein the disturbance wave has been generated;
• to extract, from learning data indicating a plurality of candidate distances being candidates of a distance between the position of the generation source of the disturbance wave and the estimated purely-latera position, and indicating for each candidate distance, a feature of an estimated reception power value being a reception power value estimated to be measured in the train when the distance between the position of the generation source of the disturbance wave and the estimated purely-lateral position is the candidate distance, a candidate distance for which the feature of the estimated reception power value matches the feature of the measured reception power value, as an extracted candidate distance;
• and
• to estimate a position being distant from the estimated purely-lateral position by the extracted candidate distance, as the position of the generation source of the disturbance wave, wherein
• in the train, a right-directional antenna whose directivity direction is right direction with respect to a traveling direction of the train, to receive a radio wave from the right direction with respect to the traveling direction of the train, and a left-directional antenna whose directivity direction is left direction with respect to the traveling direction of the train, to receive a radio wave from the left direction with respect to the traveling direction of the train, are installed, wherein
• the processing circuitry
• estimates as the estimated purely-lateral position, a traveling position of the train at a time when a largest reception power value is measured among a right-measurement reception power value being a reception power value of the radio wave received by the right-directional antenna during the disturbance wave generation period, and a left-measurement reception power value being a reception power value of the radio wave received by the left-directional antenna during the disturbance wave generation period, and
• estimates, when the largest reception power value is the right-measurement reception power value, that the position of the generation source of the disturbance wave is in the right direction with respect to the traveling direction of the train, and when the largest reception power value is the left-measurement reception power value, that the position of the generation source of the disturbance wave is in the left direction with respect to the traveling direction of the train,
• extracts, when the position of the generation source of the disturbance wave is estimated to be in the right direction with respect to the traveling direction of the train, a feature of the right-measurement reception power value,
• extracts, when the position of the generation source of the disturbance wave is estimated to be in the left direction with respect to the traveling direction of the train, a feature of the left-measurement reception power value,
• extracts as the extracted candidate distance, when the feature of the right-measurement reception power value is extracted, a candidate distance for which the feature of the estimated reception power value matches the feature of the right-measurement reception power value, from the learning data,
• extracts as the extracted candidate distance, when the feature of the left-measurement reception power value is extracted, a candidate distance for which the feature of the estimated reception power value matches the feature of the left-measurement reception power value, from the learning data,
• estimates as the position of the generation source of the disturbance wave, when the position of the generation source of the disturbance wave is estimated to be in the right direction with respect to the traveling direction of the train, a position being distant from the estimated purely-lateral position by the extracted candidate distance in the right direction with respect to the traveling direction of the train, and
• estimates as the position of the generation source of the disturbance wave, when the position of the generation source of the disturbance wave is estimated to be in the left direction with respect to the traveling direction of the train, a position being distant from the estimated purely-lateral position by the extracted candidate distance in the left direction with respect to the traveling direction of the train.

A data processing method comprising:

• by a computer, a purely-lateral position estimation process to estimate as an estimated purely-lateral position, when generation of a disturbance wave to disturb communication performed in a train is detected while the train is traveling, a position on a traveling track of the train, existing in a purely-lateral direction of a position of a generation source of the disturbance wave;
• by the computer, a feature extraction process to extract a feature of a measured reception power value which is a reception power value measured in the train during a disturbance wave generation period being a period wherein the disturbance wave has been generated;
• by the computer, a candidate distance extraction process to extract, from learning data indicating a plurality of candidate distances being candidates of a distance between the position of the generation source of the disturbance wave and the estimated purely-lateral position, and indicating for each candidate distance, a feature of an estimated reception power value being a reception power value estimated to be measured in the train when the distance between the position of the generation source of the disturbance wave and the estimated purely-lateral position is the candidate distance, a candidate distance for which the feature of the estimated reception power value matches the feature of the measured reception power value, as an extracted candidate distance;
• and
• by the computer, a generation source position estimation process to estimate a position being distant from the estimated purely-lateral position by the extracted candidate distance, as the position of the generation source of the disturbance wave, wherein
• in the generation source position estimation process,
• the computer
• designates as a verification position, a position on an outside of the traveling track, where a reception power value has been measured during the disturbance wave generation period,
• estimates as an estimated transmission power value, a transmission power value of the disturbance wave,
• calculates as a first verification-target reception power value, a reception power value of the disturbance wave estimated to be measured at the verification position when a first position being a position distant from the estimated purely-lateral position by the extracted candidate distance in a right direction with respect to a traveling direction of the train is the position of the generation source of the disturbance wave, using the estimated transmission power value and a distance between the first position and the verification position,
• calculates as a second verification-target reception power value, a reception power value of the disturbance wave estimated to be measured at the verification position when a second position being a position distant from the estimated purely-lateral position by the extracted candidate distance in a left direction with respect to the traveling direction of the train is the position of the generation source of the disturbance wave, using the estimated transmission power value and a distance between the second position and the verification position, and
• compares each of the first verification-target reception power value and the second verification-target reception power value, with a verification reception power value being the reception power value measured at the verification position during the disturbance wave generation period, and estimates either the first position or the second position, as the position of the generation source of the disturbance wave, based on a comparison result.

A non-transitory computer readable medium storing a data processing program which causes a computer to execute:

• a purely-lateral position estimation process to estimate as an estimated purely-lateral position, when generation of a disturbance wave to disturb communication performed in a train is detected while the train is traveling, a position on a traveling track of the train, existing in a purely-lateral direction of a position of a generation source of the disturbance wave;
• a feature extraction process to extract a feature of a measured reception power value which is a reception power value measured in the train during a disturbance wave generation period being a period wherein the disturbance wave has been generated;
• a candidate distance extraction process to extract, from learning data indicating a plurality of candidate distances being candidates of a distance between the position of the generation source of the disturbance wave and the estimated purely-lateral position, and indicating for each candidate distance, a feature of an estimated reception power value being a reception power value estimated to be measured in the train when the distance between the position of the generation source of the disturbance wave and the estimated purely-lateral position is the candidate distance, a candidate distance for which the feature of the estimated reception power value matches the feature of the measured reception power value, as an extracted candidate distance;
• and
• a generation source position estimation process to estimate a position being distant from the estimated purely-lateral position by the extracted candidate distance, as the position of the generation source of the disturbance wave, wherein
• in the generation source position estimation process,
• the computer is caused to
• designate as a verification position, a position on an outside of the traveling track, where a reception power value has been measured during the disturbance wave generation period,
• estimate as an estimated transmission power value, a transmission power value of the disturbance wave,
• calculate as a first verification-target reception power value, a reception power value of the disturbance wave estimated to be measured at the verification position when a first position being a position distant from the estimated purely-lateral position by the extracted candidate distance in a right direction with respect to a traveling direction of the train is the position of the generation source of the disturbance wave, using the estimated transmission power value and a distance between the first position and the verification position,
• calculate as a second verification-target reception power value, a reception power value of the disturbance wave estimated to be measured at the verification position when a second position being a position distant from the estimated purely-lateral position by the extracted candidate distance in a left direction with respect to the traveling direction of the train is the position of the generation source of the disturbance wave, using the estimated transmission power value and a distance between the second position and the verification position, and
• compare each of the first verification-target reception power value and the second verification-target reception power value, with a verification reception power value being the reception power value measured at the verification position during the disturbance wave generation period, and estimate either the first position or the second position, as the position of the generation source of the disturbance wave, based on a comparison result.