Ground base device, unmanned operation system, operation system, and unmanned operation method

A ground base device comprising:

• a schedule timetable storage to store a received schedule timetable periodically transmitted from a central control device;
• a departure-obstructed condition determiner to determine whether a departure-obstructed condition of a train is resolved and output a first signal indicating that the departure-obstructed condition is resolved when the departure-obstructed condition is resolved;
• a departure time controller to output, when the first signal is input, a second signal indicating that a departure time is appropriate when a current time is a departure time on a basis of the schedule timetable;
• a departure interval controller to output, when the second signal is input, a third signal indicating that a departure interval is appropriate in a case where each of a plurality of intervals is equal to or longer than a set threshold value so as to ensure an interval between the train and a preceding train, which is one train in front of the train, and an interval between the train and a following train, which is one train behind the train;
• and
• a departure instruction signal transmitter to output a departure instruction signal when the third signal is input, wherein
• when the central control device fails, the departure time controller uses the schedule timetable that is received when the central control device is normal.