基于分簇传感网的RSSD/TDOA协同定位方法

摘要

A kind of RSSD(Received Signal Strength Difference) location method is proposed aiming at locating the uncooperative radiation source passively with high accuracy based on energy limited clustering sensor network. Two rounds cooperative location scheme relying on TDOA(Time Difference Of Arrival) location is proposed, in which RSSD is subsidiary and TDOA location is the main method. The preliminary estimation of target position is made by RSSD location method;then some clusters are selected with high expected accuracy to make further locating according to the CRB(Cramer-Rao Bound) of TDOA. Final estimation of target position is made by weighted averaging of these TDOA locating results. Simulation results show that, the proposed modified measures can improve the locating accuracy compared with clusters selection rule and locations fusion method based on GDOP(Geometry Dilution of Precision); and RSSD/TDOA cooperative location scheme can alleviate network loading effectively, extend network lifecycle, and achieve high accuracy of locating, therefore it has good application prospects in engineering practice.%针对基于能量有限的分簇传感网实现对非配合辐射源的高精确度无源定位问题，提出了一种适用于传感网的接收信号强度差(RSSD)定位方法，并在其相关性能分析基础上提出了以RSSD定位为辅、到达时间差(TDOA)定位为主的两轮协同定位方案，即以 RSSD定位结果作为目标位置初估计，并根据各簇在该初估计位置处的 TDOA 定位 CRB，选择部分预期定位精确度较高的簇参与进一步的 TDOA 定位，最后通过对这些簇定位结果的加权平均得到最终的目标位置估计。仿真结果表明，相比基于 GDOP 的簇选择标准和定位融合方法，提出的改进措施提高了定位精确度，而 RSSD/TDOA协同定位方案在保证较高定位精确度的同时，有效地减轻了网络负载，延长了网络生命周期，具有较好的工程应用前景。