A low-cost yet effective localization scheme for wireless sensor networks (WSNs) is presented in this study. ?e proposed scheme\r\nuses only two anchor nodes and uses bilateration to estimate the coordinates of unknown nodes. Many localization algorithms for\r\nWSNs require the installation of extra components, such as a GPS, ultrasonic transceiver, and unidirectional antenna, to sensors.\r\n?e proposed localization scheme is range-free (i.e., not demanding any extra devices for the sensors). In this scheme, two anchor\r\nnodes are installed at the bottom-le? corner (Sink X) and the bottom-right corner (Sink Y) of a square monitored region of the WSN.\r\nSensors are identi??ed with the same minimum hop counts pair to Sink X and Sink Y to form a zone, and the estimated location of\r\neach unknown sensor is adjusted according to its relative position in the zone. ?is study compares the proposed scheme with the\r\nwell-known DV-Hop method. Simulation results show that the proposed scheme outperforms the DV-Hop method in localization\r\naccuracy, communication cost, and computational complexity
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