SIGNAL PROCESSING METHOD AND SIGNAL PROCESSING DEVICE
A signal processing method executed by a signal processing device, includes performing a phase connection process on a position in a space and a phase value at each of a plurality of times, performing outlier correction of a phase value for each position in the space in a predetermined direction of the space at a predetermined time among the plurality of times based on a result of the phase connection process, and correcting a phase value at a time other than the predetermined time for each of correction target positions among positions in the space.
1 . A signal processing method executed by a signal processing device, comprising:
performing a phase connection process on a position in a space and a phase value at each of a plurality of times;
performing outlier correction of a phase value for each position in the space in a predetermined direction of the space at a predetermined time among the plurality of times based on a result of the phase connection process; and
correcting a phase value at a time other than the predetermined time for each of correction target positions among positions in the space.
2 . The signal processing method according to claim 1 , wherein
in the performing outlier correction, correction of adding a correction value to a phase value at a first time earlier than a reference time is performed, and
in the correcting a phase value, correction of adding the correction value to the phase value in order from a later side for each of times earlier than the first time is performed.
3 . The signal processing method according to claim 1 , wherein
in the performing outlier correction, correction of adding a correction value to a phase value at a second time later than a reference time is performed, and
in the correcting a phase value, correction of adding the correction value to the phase value in order from an earlier side for each of times later than the second time is performed.
4 . The signal processing method according to claim 1 , wherein
in the performing outlier correction, correction using a Hampel identifier is performed.
5 . The signal processing method executed by a signal processing device according to claim 1 , wherein
in the performing a phase connection process, a phase connection process is performed on a position on an optical fiber obtained by causing a light pulse to be incident to the optical fiber, the position being in a range based on a spatial resolution, and a phase value at each of a plurality of times,
in the performing outlier correction, outlier correction of a phase value is performed for each position on the optical fiber in a longitudinal direction of the optical fiber at a predetermined time among the plurality of times based on a result of the phase connection process, and
in the correcting a phase value, a phase value is corrected at a time other than the predetermined time for each of correction target positions among positions on the optical fiber.
6 . A signal processing device comprising:
processing circuitry configured to:
perform a phase connection process on a position in a space and a phase value at each of a plurality of times;
perform outlier correction of a phase value for each position in the space in a predetermined direction of the space at a predetermined time among the plurality of times based on a result of the phase connection process; and
correct a phase value at a time other than the predetermined time for each of correction target positions among positions in the space.