数据采集与处理2013，Vol.28Issue(2)：195-200,6.
相对定位估计的修正克拉美罗界
Modified Cramer-Rao Bound for Relative Location Estimation
摘要
Abstract
In order to compare the effect of synchronization error on wireless sensor networks based relative location accuracy between time of arrival (TOA) and time difference of arrival (TDOA) schemes, the synchronization error components are analyzed and the measurement model contained clock offset is established. The TOA and TOA/RSS (received signal strength) schemes' modified Cramer-Rao bound (MCRB) are derived and compared with those of the TDOA and TDOA/RSS schemes, respectively. It is shown that the transmitter's clock offset is also an unknown variable in the new observation equation, and it can be solved in the TOA scheme to eliminate part of synchronization error. The TDOA scheme sacrifices one measurement to subtract the transmitter's clock offset from unknown variables, thus reducing synchronize requirements. The theoretical derivation and simulation results show that the MCRBs for TOA and TDOA schemes are the same, as well as the MCRBs for TOA/RSS and TDOA/RSS hybrid schemes when using the same sensor array and introducing the same amount synchronization error. Especially, the introduction of RSS can improve the short distance location accuracy in the hybrid schemes.关键词
无线传感器网络/相对定位估计/修正克拉美罗界/几何精度稀释Key words
wireless sensor networks (WSN)/ relative location estimation/ modified Cramer-Rao bound (MCRB)/ geometry dilution of position (GDOP)分类
信息技术与安全科学引用本文复制引用
李协,张效义,于旭,胡赟鹏..相对定位估计的修正克拉美罗界[J].数据采集与处理,2013,28(2):195-200,6.基金项目
国家科技重大专项基金(2010ZX03006-002)资助项目. （2010ZX03006-002）
