GPS-dependent positioning, navigation, and timing synchronization procedures have a significant impact on everyday life.\r\nTherefore, such a widely used system increasingly becomes an attractive target for illicit exploitation by terrorists and hackers\r\nfor various motives. As such, spoofing and antispoofing algorithms have become an important research topic within the GPS\r\ndiscipline. This paper will provide a review of recent research in the field of GPS spoofing/anti-spoofing. The vulnerability of GPS\r\nto a spoofing attack will be investigated and then different spoofing generation techniques will be discussed. After introducing\r\nspoofing signal model, a brief review of recently proposed anti-spoofing techniques and their performance in terms of spoofing\r\ndetection and spoofing mitigation will be provided. Limitations of anti-spoofing algorithms will be discussed and some methods\r\nwill be introduced to ameliorate these limitations. In addition, testing the spoofing/anti-spoofing methods is a challenging topic\r\nthat encounters some limitations due to stringent emission regulations. This paper will also provide a review of different test\r\nscenarios that have been adopted for testing anti-spoofing techniques.
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