Novel Two-Step Method for Joint Synchronization and Localization in Asynchronous Networks

Novel Two-Step Method for Joint Synchronization and Localization in Asynchronous Networks
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异步网络中联合同步和定位的新型两步法

DOI:
10.1109/lwc.2017.2748135
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发表时间:
2017-12
影响因子:
6.3
通讯作者:
Wei Wang
Wei Wang
中科院分区:
计算机科学2区
文献类型:
--
作者:
Fan Zhang;Gang Wang;Wei Wang

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在这封信中,联合同步和定位问题,在异步网络中使用的到达时间测量解决。提出了一种新的两步法。在步骤1中,我们通过线性加权最小二乘估计器来估计时钟偏差。在第二步中,我们通过应用二阶锥松弛技术来联合估计源节点位置和时钟偏移,从而获得二阶锥程序(SOCP)。松弛的SOCP问题通过添加正则化项来进一步收紧。此外,提出了一种简单的正则化因子的选取方法。仿真结果表明,该方法比现有方法具有更好的上级性能。
In this letter, the joint synchronization and localization problem in asynchronous networks using time-of-arrival measurements is addressed. A novel two-step method is proposed. In Step 1, we estimate the clock skew by a linear weighted least squares estimator. In Step 2, we obtain a second-order cone program (SOCP) by applying second-order cone relaxation technique to jointly estimate the source node location and clock offset. The relaxed SOCP problem is further tightened by adding a regularization term. Moreover, a simple procedure of selecting the regularization factor is proposed. Simulation results show the superior performance of the proposed method over the existing methods.
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