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GNSS(Global Navigation Satellite System) is used in various fields. Because the strength of GNSS signal is very weak on Earth surface, GNSS signal is easy to be disturbed by interference. For increasing the GNSS signal stability and availability, various mitigation methods and analysis of interference are studied. As these situation, it is necessary the standard platform to assist the interference mitigation studies and analyze receiver properties and interference effect. ETRI(Electronics and Telecommunications Research Institute) is developing GNSS Interference Signal Verification Platform. This platform generates interference signal and measures the receiver properties influenced by interference. Using the measurement result and signal propagation model, this platform analyzes the effect of interference. GNSS Interference Signal Verification Platform consists of GNSS Interference Signal Generation Equipment, GNSS Interference Signal Measurement Equipment, and GNSS Interference Propagation Model. This paper introduces GNSS Interference Signal Verification and describes the generation signal types which are jamming and spoofing interference. Finally we make the interference signal generation scenario for GNSS Interference Signal Generation Equipment. This scenario reflects the purpose and usage of GNSS Interference Signal Verification Platform.

The GNSS(Global Navigation Satellite System) is used widely and generally these days. The satellite navigation system provides navigation service globally and doesn"t need an extra cost to use. Thus this system is portrayed as public service. But this system has a weak point. The satellite signal strength is very weak on the ground so this system is vulnerable against interference signal. When the GNSS interference signal is induced, the receiver cannot operate normally. The interference is presented by jamming or spoofing about GNSS signal. The effect of the interference can be done in various field from car navigation to national infrastructure like mobile communication, power plant, etc. ETRI(Electronics and Telecommunications Research Institute) developed GPS Jamming monitoring system for monitoring interference of GNSS signal. The developed GPS Jamming monitoring system has the functions which are jamming & spoofing detection and jamming location with direction finders. Among the technologies of GPS Jamming monitoring system, this paper describes spoofing detection module. This module monitors GPS signal and detects the spoofing signal with measurement and message of receiver. ETRI performed the functional test of developed spoofing detection module through the spoofing signal generation equipment. In this test, we confirm that the spoofing signal is induced in GPS receiver and verify the performance of spoofing detection.

As the field of GNSS application is stretched, the stability of GNSS is concerned. GNSS is connected with the social infrastructure and economic problem. GNSS is used in communication system, military weapon, power station, satellite system, and so on. The information of position and time which is provided by GNSS is related with economy and military capabilities. Thus the threat of GNSS attack will increase in the future. For dealing with this request, ETRI is developing GNSS interference detection system. In this paper, we introduce the GNSS interference detection system and specially focus on the spoofing detection module. The algorithm for detecting the spoofing signal is implemented on the GNSS interference detection system. The result of implemented system is verified by the system test. The functions of spoofing detection module are verified by the spoofing environment which is generated by test-bed.