计算机工程与应用
計算機工程與應用
계산궤공정여응용
COMPUTER ENGINEERING AND APPLICATIONS
2010年
3期
222-224
,共3页
多尺度估计%卡尔曼滤波%非视距误差%Haar小波%小波变换
多呎度估計%卡爾曼濾波%非視距誤差%Haar小波%小波變換
다척도고계%잡이만려파%비시거오차%Haar소파%소파변환
multi-scale estimated%Kalman filtering%Non-Line of Sight(NLOS) error%Haar wavelet%wavelet transform
针对无线定位中非视距(Non-Line of Sight,NLOS)误差对定位精度的影响,在分析NLOS误差特性的基础之上提出了多尺度误差抑制算法.该算法将信号的多尺度估计方法和卡尔曼滤波相结合,利用小波变换特有的低通滤波特性能和小波阀值去噪能够很好地消除到达时间/到达时间差分(Time of Arrival/Time Diff of Arrival,TOA/TDOA)测量值中的NLOS误差,给出了Haar小波的实现方法.仿真实验结果表明,该算法在不同的NLOS误差模型和不同的信道环境下均能很好地抑制NLOS误差,较大幅度地提高了定位精度.
針對無線定位中非視距(Non-Line of Sight,NLOS)誤差對定位精度的影響,在分析NLOS誤差特性的基礎之上提齣瞭多呎度誤差抑製算法.該算法將信號的多呎度估計方法和卡爾曼濾波相結閤,利用小波變換特有的低通濾波特性能和小波閥值去譟能夠很好地消除到達時間/到達時間差分(Time of Arrival/Time Diff of Arrival,TOA/TDOA)測量值中的NLOS誤差,給齣瞭Haar小波的實現方法.倣真實驗結果錶明,該算法在不同的NLOS誤差模型和不同的信道環境下均能很好地抑製NLOS誤差,較大幅度地提高瞭定位精度.
침대무선정위중비시거(Non-Line of Sight,NLOS)오차대정위정도적영향,재분석NLOS오차특성적기출지상제출료다척도오차억제산법.해산법장신호적다척도고계방법화잡이만려파상결합,이용소파변환특유적저통려파특성능화소파벌치거조능구흔호지소제도체시간/도체시간차분(Time of Arrival/Time Diff of Arrival,TOA/TDOA)측량치중적NLOS오차,급출료Haar소파적실현방법.방진실험결과표명,해산법재불동적NLOS오차모형화불동적신도배경하균능흔호지억제NLOS오차,교대폭도지제고료정위정도.
In view of the influence of NLOS(Non-Line of Sight) in wireless lacalization,a multi-scale algorithm for NLOS mitiga-tion is proposed based on the analysis of NLOS error.This algorithm combines multi-scale estimated of the signal with the Kalman filtering,using the low-pass filtering characteristic of wavelet transformation to mitigate the NLOS error in the measure-ments of TOA/TDOA(Time of Arrival/Time Diff of Arrival),and the method of the Haar wavelet is given.The simulation testing result indicates that this algorithm is very good at mitigating the NLOS error and has a high location accuracy under the differ-ent NLOS error model and the different channel environment.
