A method for measuring the position of quadrotors using a tether winder

2016 
Use of a Quadrotor is considered as one of the methods to inspect infrastructures such as a tunnel or a bridge. In such a case, it needs to control the position of the airframe. Note, however, that it is difficult to realize the position control using GPS in environments, such as in a tunnel or under a bridge, because there is a problem, such as the weakness of the GPS signal or the incomplete reaching. Therefore, the present research is aimed at developing position control not using GPS, and proposes a method for detecting the airframe position of a tethered Quadrotor, from the length and tension of the tether. Especially, a tether winder is produced so that the length and tension of the tether are measured. This paper describes how to detect the position of a Quadrotor, and presents some operation experiments of the produced tether winder.
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