A simulator is designated for an anchor-free localization of nodes in wireless sensor network defined by IEEE 802.15.4 standard. It was proposed as the web-based Java simulator. User can define a number of nodes, a measurement error, a density of network and type of distance measurement technique. The trend of energy consumption in a dependency on a number of optimization steps is the output of the simulator. The final located layout is also the output of the simulation. The simulator implements a AFL algorithm for the coordinates estimation.
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