CAJ | 학술논문

针对合作传感器网络的定位问题，提出在未知节点周转时间（ TATs）条件下估计多个目标节点位置的方案。在该方案中，每个目标节点能与多个锚节点、其他目标节点通信，并测量它们间的双向到达时间（ TW-TOA）值，其包括在信道终端的处理时延。基于这些测量值，对目标节点位置和TATs进行最大似然估计（ MLE），而这产生了非凸优问题，为此，将其近似转化为非线性最小二乘问题。最后，通过欧氏距离矩阵（ EDM）对多个目标节点位置和TATs的值进行估计。仿真结果表明：提出的方案具有良好的定位精度。在不同的场景下，提出的方案的均方根误差逼近克莱姆-拉奥下限（ CRLB）。
침대합작전감기망락적정위문제，제출재미지절점주전시간（ TATs）조건하고계다개목표절점위치적방안。재해방안중，매개목표절점능여다개묘절점、기타목표절점통신，병측량타문간적쌍향도체시간（ TW-TOA）치，기포괄재신도종단적처리시연。기우저사측량치，대목표절점위치화TATs진행최대사연고계（ MLE），이저산생료비철우문제，위차，장기근사전화위비선성최소이승문제。최후，통과구씨거리구진（ EDM）대다개목표절점위치화TATs적치진행고계。방진결과표명：제출적방안구유량호적정위정도。재불동적장경하，제출적방안적균방근오차핍근극래모-랍오하한（ CRLB）。
Aiming at localization problem of cooperative sensor network,propose scheme to estimate multiple nodes positions in the presence of unknown turn-around times( TATs). In the adopted scheme,each target node can communicate with several anchor nodes and other target nodes,and two-way times-of-arrival between them are measured,which includes processing delays at both channel endpoints. The maximum likelihood estimates( MLE) of positions of target node and turn-around times( TATs)is carried out based on those measurement value,which generate non-convex optimization problem,it is approximated transform to nonlinear least squares problem. Finally, positions and TATs of multiple target nodes are estimated jointly by solving Euclidean distance matrix. Simulation result show that the proposed method has good localization precision,under different scenes,RMSE of the proposed scheme approach the Cramer-Rao lower bound( CRLB).