Research on GNSS Anti-spoofing Method Assisted by Loran-C System

Abstract

Global Navigation Satellite System (GNSS) is vulnerable to spoofing attack because of its low power and open civil signal structure. Loran-C system is independent of GNSS and can be used for anti-spoofing. In order to detect, identify the spoofing signals and exclude its influence on position, velocity, and time (PVT) results, the paper proposes the GNSS anti-spoofing method assisted by Loran-C system. When the number of Loran-C signals is relatively less, the difference observations of Loran-C are used to identify whether the GNSS positioning result is right or wrong, and the factors affecting the detection performance are studied. When the Loran-C receiver can provide independent positioning information, all spoofing signals are identified by the clustering algorithm after the consistency detection of GNSS pseudorange observations, Loran-C positioning information and satellite positions. Then if the number of remained GNSS signals after spoofing exclusion is less than 4, the GNSS signals and Loran-C signals are combined to improve the positioning accuracy and the Dilution of Precision (DOP) is used to measure the positioning accuracy. Finally, the feasibility of the proposed method is verified by simulation experiments.