Global Navigation Satellite System (GNSS) is used variously like car navigation, LBS, telemetics, construction, military purpose, etc. As the usage of GNSS is extended, the stability of GNSS becomes more important. If the GNSS is not working correctly, our society will be in disorder. Recently the disturbance against GNSS is issued. Jamming which is one of GNSS disturbance attacks makes GNSS receiver disable with strong disturbance radio frequency. As the disturbance attack becomes more elaborate, the attack will be evolve to spoofing attack which makes the receiver to calculate the wrong position and time with imitated signal. Spoofing attack is more threatening because the receiver is too hard to detect the attack. This attack makes the damage in GNSS application service which uses the position and timing information of GNSS. Therefore, the spoofing detection is important in increasing GNSS stability. In this paper, the design method for spoofing detection module is introduced in the point of development.

Keywords: 위성항법, 기만, 검출