Localization, which determines the geographical locations of sensors, is a crucial issue in wireless sensor networks. In this paper, we\r\npropose a novel lightweight equilateral triangle localization algorithm (LETLA) that accurately localizes sensors and minimizes the\r\npower consumption. In the LETLA, the approximate coordinates substituted for the real coordinates of the unknown node, and the\r\ncorresponding optimization problem is formulated to minimize the estimation error.With the sequences that represent the ranking\r\nof distances from the anchors to the unknown node, a simple and robust technique is developed to quickly and efficiently estimate\r\na region containing the approximate coordinates, and a condition under which the approximate error can be minimized is given.\r\nThis condition employs a newgeometric construct of anchor layout called equilateral triangle diagrams. Extensive simulations show\r\nthat the LETLA performs better than other state-of-the-art approaches in terms of energy consumption with the same localization\r\nprecision.
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