In real measurement environment

some factors of multi-path

diffraction

obstacles

etc.

propagation losses produced location errors in the positioning process by RSSI technology.Through analyzing error range in 3D space

a new spatial locating algorithm ERSS based on RSSI was proposed.The ERSS algorithm had the advantages: locating calculation simplicity

no extra communication cost on the locating process

and no hardware expansion required.Simulation results show ERSS algorithm achievs noticeable improvement over RSSI algorithm on distance locating accuracy and responding time

and it is suitable to be applied on the environment of wireless sensor network nodes with low cost and performance of hardware.