Weighted grid scan secure location algorithm with multi available nodes

Since they play a crucial role in wireless sensor networks (WSNs), many localization schemes have been proposed in recent years. It is generally assumed that the nodes in networks are all reliable; however, this may not always be the case. Especially in battlefield conditions, the WSNs are often attacked by hostile parties in order to destroy or mislead the localization system. As in other type of networks, the question of using a multi-path method also existed with relation to WSNs. Thus, a location algorithm needed to be developed. In this paper, a new scheme called "weighted grid scan secure localization algorithm with multi-available nodes (MANWS)" was put forward in order to adjust the networks distributed in the battlefield. It may avoid the location errors resulting from attacks and multi-path. The MANWS scheme first justified whether the anchors were dependable and got rid of malicious anchors. Then, the unknown nodes were localized through a weighted grid scan algorithm. Simulation results show that the MANWS algorithm achieves better accuracy than the DLE(distributed location estimation) algorithm regardless of whether or not attacks exist.