定位机制研究(Localization) Suppose the location of the unknown node is (x0,y0)and it is able to obtain the distance estimates d to the i-th reference node locating at (xi,vi).Let di be the actual Euclidean distance to the i-th reference node,i.e., d:=√(c-x0)2+(-o)2. (x1,y1) (x0,0) (x2,y2) 0 d d2 2 (x3,y3)定位机制研究（Localization） • Suppose the location of the unknown node is (x0, y0) and it is able to obtain the distance estimates �" # to the i-th reference node locating at (xi, yi). Let �" be the actual Euclidean distance to the i-th reference node, i.e., (x0, y0) (x1, y1) (x3, y3) (x2, y2) �$ �% �&