在无线传感器网络中,基于消息到达时间的时钟同步与定位联合研究是一项重要的研究课题。网络的随机时延一般用指数分布描述。基于消息到达时间的测量值,推出了在指数随机噪声条件下同步与定位的联合最大似然估计(JMLE)算法以及联合最佳线性无偏估计(JBLUE)算法。仿真表明,与已有的联合算法相比,提出的JMLE算法与JBLUE算法估计精度较高。
Joint clock synchronization and localization based on the time of arrival (TOA) measurements is a veryimportant research topic for many wireless sensor network applications. The exponentially distributed link delay isusually used to describe the practical network link condition. The joint maximum likelihood estimation (JMLE) onclock synchronization and localization problem was first proposed based on the TOA measurements. JMLE wasoptimal only for Gaussian delay, as for the exponentially distributed delay, the joint best linear unbiased estimation(JBLUE) was then proposed. The result is derived via simulation: JMLE and JBLUE are always superior to the latestjoint algorithm, with the highest estimation accuracy.