Autonomous Lockout Map Construction Technique for Secondary Surveillance Radar Mode S network

Secondary Surveillance Radar (SSR) Mode S is an air traffic control radar system with improved surveillance and datalink capability. Recently, SSR mode S network attracts attentions as a way to solve problems such as the interrogator identifier code problem or radio frequency (RF) signal environment pollution. In SSR mode S network, each site has lockout map. Lockout is a command from GS to aircraft. Aircraft stops replying to all-call if it receives lockout. Lockout map determines area where GS lockout aircraft. There are several problems in current lockout map. First, it is difficult to create optimum lockout map. Second, it becomes complex to allocate and manage lockout maps if many sites join network. As the number of sites increase, Mode S operator has to prepare many maps. To solve these problems, we propose the Autonomous Lockout Map Construction Technique for SSR Mode S network. This technique enables Mode S GS to autonomously construct optimum lockout map by exchanging aircraft and site information through network. In this paper, we describe the background and details of the proposed technique. Then we show simulation results for validating the proposed technique.