An airship system according to the invention has an airship (110), a base
station (120), and at least three measurement points. The airship (110)
emits ultrasonic waves upon receiving an instruction from the base station (120).
Measurement point units (S1-S3) receive the ultrasonic waves, and
thereby measure distances from the airship (110) to the respective measurement
points. An MPU that is incorporated in the base station (120) calculates
a position of the airship (110). The base station (120) controls
a route of the airship (110) based on the calculated position by sending
a flight instruction to the airship (110). In this manner, an airship system
can be provided that makes it unnecessary for an operator to pilot the airship
and that can reduce the load weight and the power consumption of the airship.
