PROBLEM TO BE SOLVED: To ensure the lock of a UAV when an optical device is tracking the UAV.SOLUTION: The position of a TS (total station) 100 is measured, and the positional information on a hovering UAV 200 is acquired from the GPS device of the UAV200. After that, the direction of the UAV 200 viewed from the TS 100 is calculated on the basis of the position of the TS 100 and the positional information on the UAV 200 in a hovering state, and the UAV 200 is captured by the TS 100.SELECTED DRAWING: Figure 1
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