能够建立一个最紧最合适的关于目标节点与测量节点之际的几何关系，以达到提高二维无线定位精度的目的。-In wireless location systems the geometry between target and mea-suring points influences the positioning accuracy of the target. It is usually quantified by the geometric dilution of precision (GDOP).

GDOP metric document

GDOP error document for reference