吉林大学学报(理学版)
吉林大學學報(理學版)
길림대학학보(이학판)
JOURNAL OF JILIN UNIVERSITY(SCIENCE EDITION)
2014年
3期
556-560
,共5页
钟丽鸿%胡成全%金京姬
鐘麗鴻%鬍成全%金京姬
종려홍%호성전%금경희
无线传感器网络%定位%极大似然估计法%参照锚节点%误差分析
無線傳感器網絡%定位%極大似然估計法%參照錨節點%誤差分析
무선전감기망락%정위%겁대사연고계법%삼조묘절점%오차분석
wireless sensor network (WSN)%localization%maximum likelihood estimation algorithm%reference node%error analysis
通过分析极大似然估计法进行求解方程未知节点位置可知,代入最后一个方程锚节点(参照锚节点)的测距误差会对极大似然估计法定位误差产生较大影响,并实现了基于 RSSI的极大似然估计定位算法实测实验.实验结果表明,参照锚节点不带测距误差与参照锚节点带测距误差相比,前者的定位误差小,在30 m×30 m 方形定位区域内前者较后者平均定位误差值减小0.4~1.0 m.
通過分析極大似然估計法進行求解方程未知節點位置可知,代入最後一箇方程錨節點(參照錨節點)的測距誤差會對極大似然估計法定位誤差產生較大影響,併實現瞭基于 RSSI的極大似然估計定位算法實測實驗.實驗結果錶明,參照錨節點不帶測距誤差與參照錨節點帶測距誤差相比,前者的定位誤差小,在30 m×30 m 方形定位區域內前者較後者平均定位誤差值減小0.4~1.0 m.
통과분석겁대사연고계법진행구해방정미지절점위치가지,대입최후일개방정묘절점(삼조묘절점)적측거오차회대겁대사연고계법정위오차산생교대영향,병실현료기우 RSSI적겁대사연고계정위산법실측실험.실험결과표명,삼조묘절점불대측거오차여삼조묘절점대측거오차상비,전자적정위오차소,재30 m×30 m 방형정위구역내전자교후자평균정위오차치감소0.4~1.0 m.
When the maximum likelihood estimate equation was used to solve the unknown node’s position,it was found that the ranging error for the anchor node (reference node)in the last equation has greater impact on the localization error.The maximum likelihood experiment based on received signal strength indication in the reality shows that in the area of 30 m × 30 m square positioning, average positioning error decreases from 0.4 m to 1.0 m when the reference node is being set without ranging error.