Protective Scheme of Slowly-Varying Time Synchronization Attacks Based on Three-Step Iterative Filter
For the case where the satellite receiver may suffer from a slowly-varying time synchronization attack caused by forwarding spoofing,a protective scheme based on three-step iterative filter is proposed and demonstrated.In this scheme,a slow time synchronization attack model and a slow time synchroniza-tion attack awareness model are introduced,and then the clock bias and drift of the slow time synchroniza-tion attack awareness model are estimated by using three-step iterative filter,and finally the estimated clock bias and drift are corrected via the correction model.Simulation results show that the proposed scheme can detect the slowly-varying time synchronization attack in time within 1s and effectively sup-press it,and reduce the influence of time synchronization attack on timing accuracy.
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