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<p>drainage of constrained sensor nodes.To overcome this problem a limited number of reference nodes (with GPS) within a field is employed. These nodes continuously broadcast their locations and other nodes in proximity receive these locations and calculate their position using some mathematical technique like <a href="page.php?w=trilateration">trilateration</a>. For localization, at least three known reference locations are necessary to localize. Several localization algorithms based on <a href="page.php?w=Sequential_Monte_Carlo">Sequential Monte Carlo</a></p><p>
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