计算机与现代化
計算機與現代化
계산궤여현대화
COMPUTER AND MODERNIZATION
2014年
11期
35-39
,共5页
无线传感器网络%三维节点定位%粒子群优化%DV_Hop算法
無線傳感器網絡%三維節點定位%粒子群優化%DV_Hop算法
무선전감기망락%삼유절점정위%입자군우화%DV_Hop산법
WSN%three-dimensional node location%particle swarm optimization%DV_Hop algorithm
在三维无线传感器网络中，采用非测距定位方法DV_Hop时，由于三维空间中节点分布复杂，测距误差增大，定位准确度迅速降低，为了提升它的准确度，提出一种改进的DV_Hop定位方法，使用最小均方差估计未知节点与已知节点之间的距离，定位结果用粒子群算法优化，以距离误差因子加权均方误差作目标函数，采用凹函数递减策略，提前进入局部搜索，提高定位准确度。仿真结果表明，相同条件下，改进的DV_Hop算法定位准确度要优于传统DV_Hop算法。
在三維無線傳感器網絡中，採用非測距定位方法DV_Hop時，由于三維空間中節點分佈複雜，測距誤差增大，定位準確度迅速降低，為瞭提升它的準確度，提齣一種改進的DV_Hop定位方法，使用最小均方差估計未知節點與已知節點之間的距離，定位結果用粒子群算法優化，以距離誤差因子加權均方誤差作目標函數，採用凹函數遞減策略，提前進入跼部搜索，提高定位準確度。倣真結果錶明，相同條件下，改進的DV_Hop算法定位準確度要優于傳統DV_Hop算法。
재삼유무선전감기망락중，채용비측거정위방법DV_Hop시，유우삼유공간중절점분포복잡，측거오차증대，정위준학도신속강저，위료제승타적준학도，제출일충개진적DV_Hop정위방법，사용최소균방차고계미지절점여이지절점지간적거리，정위결과용입자군산법우화，이거리오차인자가권균방오차작목표함수，채용요함수체감책략，제전진입국부수색，제고정위준학도。방진결과표명，상동조건하，개진적DV_Hop산법정위준학도요우우전통DV_Hop산법。
When it used non-ranging positioning method DV_Hop in three-dimensional wireless sensor networks( WSN) , the po-sitioning accuracy decreased significantly due to the complex distribution of nodes in three-dimensional space which lead to in-crease ranging error. In order to improve the positioning accuracy, a positioning algorithm based on an improved particle swarm optimization was proposed. It used minimum mean-square error to estimate the distance between unknown nodes and anchor nodes, and used the weighted mean square error as the optimization objective function, and used a concave function with decre-menting strategy to allow particle swarm optimization access to the local search algorithm faster. It effectively raises the node posi-tioning accuracy. The simulation results show that the positioning accuracy of the improved DV_Hop algorithm is superior to the traditional DV_Hop algorithm in the same condition.
