Detection apparatus, time synchronization method, non-transitory computer readable recording medium, and detection system

A time synchronization method that is implemented by a detection apparatus including:

• an internal clock;
• an oscillator unit that generates oscillation every time a temporal condition is met;
• and
• an oscillation receiver unit that detects oscillation, the time synchronization method comprising:
• measuring a time from when the oscillator unit generates the oscillation to when the oscillation receiver unit detects the oscillation;
• determining a mode based on whether the time that is measured at the measuring is longer than a predetermined interval time;
• determining whether to perform correction of deviation of the internal clock when it is determined that the mode is a specific mode;
• and
• correcting the internal clock when determining that the correction is performed.

A non-transitory computer readable recording medium having stored therein a time synchronization program that causes a detection apparatus including:

• an internal clock;
• an oscillator unit that generates oscillation every time a temporal condition is met;
• and
• an oscillation receiver unit that detects oscillation, to perform a process comprising:
• measuring a time from when the oscillator unit generates the oscillation to when the oscillation receiver unit detects the oscillation;
• determining a mode based on whether the time that is measured at the measuring is longer than a predetermined interval time;
• determining whether to perform correction of deviation of the internal clock when it is determined that the mode is a specific mode;
• and
• correcting the internal clock when determining that the correction is performed.

A detection system comprising:

• a first detection apparatus that includes a first internal clock;
• and
• a second detection apparatus that includes a second internal clock, wherein
• the first detection apparatus further includes:
• a first oscillator unit that generates oscillation every time a temporal condition is met;
• a first oscillation receiver unit that detects oscillation that is generated by the second detection apparatus;
• a measurement unit that measures a time from when the first oscillator unit generates the oscillation to when the first oscillation receiver unit detects the oscillation;
• a determination unit that determines a mode based on whether the time that is measured by the measurement unit is longer than a predetermined interval time;
• and
• a correction unit that determines whether to perform correction of deviation between the first internal clock and the second internal clock based on a reference time when it is determined that the mode is a specific mode, and corrects one of the first internal clock and the second internal clock when determining that the correction is performed, and
• the second detection apparatus further includes:
• a second oscillator unit that generates oscillation every time a temporal condition is met.