A Complex EKF Based Vertical Direction Angle Estimation for GPS Spoofing Detection

Chang Ho Kang, Sun Young Kim, and Chan Gook Park

Peer Reviewed

Abstract:	In this paper, a simple spoofing detection method using a GPS directional antenna is proposed which exploits the difference between the estimated direction-of-arrival (DOA) and the measured DOA from GPS almanac and ephemeris data. The receiving signal’s DOA is estimated by using single antenna power measurement and the proposed method is based on complex extended Kalman filter (EKF) which is a complex valued state space based estimation technique. In order to perform the proposed algorithm, it is assumed that the spoofer is aware of the target’s location but its DOA is not perfectly the same as that of authentic GPS signal, the orientation of the directional antenna is known by using an attitude & heading reference system (AHRS) which is attached to the antenna, and its antenna radiation pattern is also known. The proposed detection method is evaluated by theoretical analysis and simulations. It is confirmed that the proposed algorithm can detect the spoofing signal according to the different direction angles of the spoofing signal, especially low DOAs.
Published in:	Proceedings of the 28th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2015) September 14 - 18, 2015 Tampa Convention Center Tampa, Florida
Pages:	3415 - 3421
Cite this article:	Kang, Chang Ho, Kim, Sun Young, Park, Chan Gook, "A Complex EKF Based Vertical Direction Angle Estimation for GPS Spoofing Detection," Proceedings of the 28th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2015), Tampa, Florida, September 2015, pp. 3415-3421.
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