Collaborative Beamforming for Multi‐Target Localization Using Passive Anchors

ABSTRACT Using wireless passive sensor nodes as anchors is a cost‐effective way for localization system. However, the quality of ranging information is determined by the power of request signal from the active targets. Thus, localization accuracy is influenced by the location request and transmission power allocation schemes. In this letter, we provide the Fisher information matrix of multiple active target localization using passive anchors. Further, we propose a joint collaborative beamforming strategy to optimize the localization accuracy considering the power constraints and localization availability constraints. The proposed strategy employs a two‐stage semidefinite programming to fully exploit the spatial correlation. Simulation results demonstrate that our proposed strategy outperforms other schemes in improving the localization performance.