Time synchronization device, and method and program therefor

A time synchronization device comprising:

• a timepiece unit that generates a time signal synchronized with a predetermined standard time and outputs the time signal to an exterior;
• an acquisition unit that acquires temporal reception characteristics of a radio wave by a simulation or actual measurement and holds the acquired temporal reception characteristics, the radio wave including information relating to the predetermined standard time;
• a schedule determination unit that determines a schedule according to the held temporal reception characteristics of the radio wave at a reception location of the radio wave, the temporal reception characteristics changing over time and indicating a predicted change in reception characteristics of the radio wave over a given period of time, the schedule having a first time period in which time synchronization is performed using time information based on the radio wave, and a second time period in which time synchronization is performed by means of a holdover, the holdover being performed proactively using a clock signal from an internal or external clock source;
• a clock signal selection unit that selects whether synchronization with the predetermined standard time by the timepiece unit is performed by receiving the radio wave and using the time information based on the received radio wave, or is performed by means of the holdover instead of the time information, and selectively supplies to the timepiece unit either one of the time information based on the received radio wave, and the clock signal from the internal or external clock source;
• and
• a controller that controls the clock signal selection unit according to the schedule determined by the schedule determination unit.