Aiming at the problem that RSSI-based range measurement has a large error in RSSI-based localization algorithm

a new approach using antenna diversity technology on anchor nodes is proposed. Two antennas are fixed to an anchor node in the approach

and the angle of the two antennas on an anchor node is 90°and spatial diversity is applied. When receiving broadcast signal from unknown node

anchor node will select the one which has stronger signal in the two antennas and record the RSSI value. Experiment shows that introducing antenna diversity into anchor nodes will reduce the influence of multipath fading and enhance the stability of RSSI value

so reduces ranging error and improves positioning precision.