Abstract
In this letter, we study the localization of a mobile ground-user via received-signal-strength, where <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$N$ </tex-math></inline-formula> unmanned-aerial-vehicles (UAVs) are deployed as anchors. Due to the movements of anchors and user, the path-loss exponent is time-varying and has to be estimated properly following the cancellation of the shadowing effect. A problem is formulated to estimate the time-varying path-loss exponent and the distance between each anchor and user, however it is non-convex. In order to obtain accurate estimations, we propose to break the problem into two sub-tasks. A filter is first designed by least-mean-square method. Then, a Newton-gradient algorithm is proposed to iteratively find the estimations of the path-loss exponent and the distance. The effectiveness of the proposed method is verified by numerical simulations.
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