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Aiming at improving the precision of nodes' localization, this paper analyzes the source of the localization error when using the least square algorithm, and proposes the principle to choose the benchmark anchor nodes in reducing the power of equation. Based on this principle, the algorithm choosing the nearest node as the benchmark anchor node in LSM and the algorithm choosing the synthetic nearest node as the benchmark anchor node in LSM are put forward. It is proved by the simulation in MATLAB that the improved LSM can effectively improve the precision of the nodes localization.
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