计算机工程与应用
計算機工程與應用
계산궤공정여응용
COMPUTER ENGINEERING AND APPLICATIONS
2015年
15期
92-95,142
,共5页
距离向量算法%接收信号强度指示(RSSI)%跳数%平均跳距%校正向量%Matlab仿真
距離嚮量算法%接收信號彊度指示(RSSI)%跳數%平均跳距%校正嚮量%Matlab倣真
거리향량산법%접수신호강도지시(RSSI)%도수%평균도거%교정향량%Matlab방진
Distance Vector(DV)-Hop algorithm%Receive Signal Strength Indication(RSSI)%hop%average hop distance%correction vector%Matlab simulation
针对传统DV-Hop算法中定位精度低的问题，该算法从三个方面进行改进，（1）设置距离发射端标准一跳时节点所接收的接收信号强度指示（RSSI）值，利用节点接收信号的RSSI值与设置的RSSI值之间的比来修正跳数。（2）将未知节点的平均跳距分两段考虑，使未知节点到锚节点的估计距离更精确。（3）构造校正向量，对未知节点的估计坐标进行校正。仿真实验表明改进算法的定位精度明显高于传统DV-Hop算法和文献[6]基于RSSI比值修正的算法，稳定性也有一定的提升。
針對傳統DV-Hop算法中定位精度低的問題，該算法從三箇方麵進行改進，（1）設置距離髮射耑標準一跳時節點所接收的接收信號彊度指示（RSSI）值，利用節點接收信號的RSSI值與設置的RSSI值之間的比來脩正跳數。（2）將未知節點的平均跳距分兩段攷慮，使未知節點到錨節點的估計距離更精確。（3）構造校正嚮量，對未知節點的估計坐標進行校正。倣真實驗錶明改進算法的定位精度明顯高于傳統DV-Hop算法和文獻[6]基于RSSI比值脩正的算法，穩定性也有一定的提升。
침대전통DV-Hop산법중정위정도저적문제，해산법종삼개방면진행개진，（1）설치거리발사단표준일도시절점소접수적접수신호강도지시（RSSI）치，이용절점접수신호적RSSI치여설치적RSSI치지간적비래수정도수。（2）장미지절점적평균도거분량단고필，사미지절점도묘절점적고계거리경정학。（3）구조교정향량，대미지절점적고계좌표진행교정。방진실험표명개진산법적정위정도명현고우전통DV-Hop산법화문헌[6]기우RSSI비치수정적산법，은정성야유일정적제승。
In view of the problem of low positioning accuracy in traditional DV-Hop algorithm, the algorithm is improved from three aspects. Firstly, it sets Received Signal Strength Indicator(RSSI)value which node receives, when the distance is one standard hop between node and transmitter. It uses RSSI value which node receives to set RSSI value ratio to correct hops. Secondly, the average hop distance of unknown nodes is considered from two cases to make estimated distance between unknown node and anchor node more accurate. Thirdly, it introduces correction vector to correct the estimate coor-dinates of the unknown node. Simulation results show that positioning precision of the improved algorithm is significantly higher than the traditional DV-Hop algorithm and the algorithm of literature[6] and stability also has certain ascend.
