The technology suggested in this paper is about the manner to provide Anti-Jamming functions to GNSS which is vulnerable to Jamming due to structurally weak reception signal and to protect GNSS from the risks of High-altitude electromagnetic pulse (HEMP) (which occurred at high-altitudes (over 40 km) in case of nuclear explosion) as well as HPM (which is capable of electronic equipment-incapacitation in tens of kilometers by releasing high power energy in a moment artificially) at the same time.

Keywords: GPS, anti-jamming, HEMP, HPM filter