Research on the Influence of Drone Countermeasure Equipment on the Surveillance System Used in Civil Aviation

Due to the lack of perfect regulations and standards in civilian drones field, drones sometimes fly illegally. When illegally flying drones invade airports, which causes flights to be diverted and even airports to be paralyzed. In order to protect the flight safety, drone countermeasure equipment is need to use for driving away illegally flying drones. But drone countermeasure equipment is a new active interference source. When it is used at or around airports, which may cause electromagnetic interference to the surveillance system, and it will not work correctly. Therefore, it is necessary to study protective distances of the surveillance system. In this paper, a method for analyzing the electromagnetic interference influence of drone countermeasure equipment on the surveillance system is proposed. Firstly the radiated field strength of drone countermeasure equipment is measured in an anechoic chamber, and then stray radiation field strengths at frequency bands of a secondary surveillance radar (SSR) and an automatic dependent surveillance-broadcast (ADS-B) also are acquired. Meanwhile, test results are compared with protection requirements of electromagnetic environment of SSR and ADS-B. Moreover, electromagnetic interference effects of drone countermeasure equipment on SSR and ADS-B are analyzed according to the electromagnetic compatibility theory and protection ratios of SSR and ADS-B. At last, protective distances of SSR and ADS-B are proposed separately. The results can provide some technical supports for the safe use of drone countermeasure equipment at airports.