With the development of the global navigation satellite system(GNSS),its timing function has been widely used in critical national infrastructures such as power and communications,as well as in the field of national defence.However,due to the inherent vulnerability of satellite navigation signals,the timing service is easily affected by malicious interference,and the security of satellite timing has increas-ingly attracted global attention.At present,most of the existing technologies mainly focus on the interfer-ence with the purpose of navigation and positioning,while the interference with the timing is often ig-nored,in fact,the interference with the timing results can be more harmful and extremely covert to the target.Firstly,the research status of key GNSS timing interference technologies is sorted out from three aspects,which are basic jamming mode,timing interference technology and timing interference effect e-valuation technology.Secondly,the current scientific problems of GNSS intentional timing interference technology are also analyzed.Finally,the future development trend of related technologies is predicted.
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