In order to increase estimation precision of node localization in wireless senior networks( WSNs)
a weighted least squares algorithm of optimize reference anchor nodes( ORAWLS) is proposed. Reference anchor node is optimized based on minimized theoretical mean square error
so as to further improve the system performance. The simulation verification results show that
compared with maximum likelihood( ML) algorithm and linear least squares( LLS) algorithm
ORAWLS algorithm can effectively improve the positioning precision and show good system performance.