Wind farms, which are motorial large obstacles, may degrade the performance of the Secondary Surveillance Radar (SSR) in Air Traffic Control (ATC). The SSR is undergoing the upgrade from Mode A/C to Mode S. Thus, it is important and meaningful to study the impact of wind farms on SSR for protecting the safety of civil aviation. The conditions of determining the impacted flight region of the interrogation and response signals are analyzed based on the contrastive analysis of signal characteristics of Mode S and A/C. Also, the calculation method of impacted flight region caused by wind farms as well as the quantitative comparison are given. The method and the conclusion can be used to provide a basis for selecting proper location for the radar near the wind farms (or address for new wind farms near the radar), and for designing a flight program.
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