In a wireless sensor network (WSN), node localization is a key requirement for many applications. The concept of mobile anchorbased localization is not a new concept; however, the localization of mobile anchor nodes gains much attention with the advancement in the Internet of Things (IoT) and electronic industry. In this paper, we present a range-free localization algorithm for sensors in a three-dimensional (3D) wireless sensor networks based on flying anchors.............
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