科技通报
科技通報
과기통보
BULLETIN OF SCIENCE AND TECHNOLOGY
2014年
9期
147-151,183
,共6页
质心算法%定位误差%RSSI差值%加权%距离
質心算法%定位誤差%RSSI差值%加權%距離
질심산법%정위오차%RSSI차치%가권%거리
centroid algorithm%the positioning error%RSSI difference%weighted%distance
由于RSSI值随机变化较大，使得直接利用RSSI值作为依据来计算信标节点的权值的加权质心定位算法在定位过程中存在较大误差。针对这一问题，提出基于RSSI差值加权的定位算法，利用网络中信标节点之间的距离和相应的RSSI值作为参考，并将测得的RSSI值与信标节点之间的RSSI值作为差值，根据差值的大小判断所测距离与信标节点之间距离的接近程度，以此来减小实际环境对加权质心定位算法的影响。仿真结果表明，与基于RSSI校验的定位算法相比，该方法进一步减小了定位误差。
由于RSSI值隨機變化較大，使得直接利用RSSI值作為依據來計算信標節點的權值的加權質心定位算法在定位過程中存在較大誤差。針對這一問題，提齣基于RSSI差值加權的定位算法，利用網絡中信標節點之間的距離和相應的RSSI值作為參攷，併將測得的RSSI值與信標節點之間的RSSI值作為差值，根據差值的大小判斷所測距離與信標節點之間距離的接近程度，以此來減小實際環境對加權質心定位算法的影響。倣真結果錶明，與基于RSSI校驗的定位算法相比，該方法進一步減小瞭定位誤差。
유우RSSI치수궤변화교대，사득직접이용RSSI치작위의거래계산신표절점적권치적가권질심정위산법재정위과정중존재교대오차。침대저일문제，제출기우RSSI차치가권적정위산법，이용망락중신표절점지간적거리화상응적RSSI치작위삼고，병장측득적RSSI치여신표절점지간적RSSI치작위차치，근거차치적대소판단소측거리여신표절점지간거리적접근정도，이차래감소실제배경대가권질심정위산법적영향。방진결과표명，여기우RSSI교험적정위산법상비，해방법진일보감소료정위오차。
RSSI value changes randomly, making weighted centroid localization algorithm which direct use RSSI value as the basis to calculate the beacon nodes rights value large error in the positioning process. To solve this problem, location algorithm based on the RSSI difference weighted is proposed. This method makes use of the distance between the beacon nodes and the corresponding RSSI value as a reference, and the RSSI value between the measured RSSI values and the beacon nodes do Poor, then based on the magnitude of the difference to determine the closeness of the distance between the measured value and beacon node pair, in order to reduce the impact of the actual environment on the weighted centroid localization algorithm. Simulation results show that compared with the positioning algorithm based on RSSI calibration, this method further reduce the positioning error.
