Integrating pyModeS and OpenSky Historical Database A large quantity of Mode S data is being gathered by the OpenSky receiver network every day. Information regarding common ight states, such as position, ground speed, and the vertical rate is broadcast by ADSB and has already been decoded and made available for researchers via the OpenSky historical database. However, there is still a large amount of Mode S communication data that has not yet been fully explored. Speci_cally, the information contained in Enhanced Mode S Surveillance downlink messages can be utilized to better support ATM research. The challenge of decoding such information lies in the implicit inference process for Mode S CommB messages. This paper presents a new open library, pymodesopensky, which connects the existing opensource pyModeS decoder to the raw Mode S messages from the OpenSky historical database through the Impala shell. It also presents a convenient workow that can be used to obtain additional information regarding airspeeds, ight intentions, and meteorological conditions of a given ight from the OpenSky database. An analysis based on a global dataset from OpenSky is conducted, and the associated Mode S interrogation statistics in di_erent regions are shown.

IPbased Space Air Ground Information Network for Air Traffic Control Communication Communication Navigation and Surveillance (CNS) are the three main components of air traffic management (ATC). The long due transformation of air traffic surveillance from old technology to modern technology is about to accomplish by the deployment of satellitebased ADS B (Automatic Dependent SurveillanceBroadcast) technology. This will extend current airspace coverage from limited continental regions (30%) to a global (100%) coverage. However, communication, being the other critical component of air traffic control is still far behind such a major modernization as well as not ready to accompany this global nature of future air traffic. In our recent work, we have elaborated the limitations of space basedADSB system and proposed an alternate better solution in the form of IPbased Space Air Ground Information Network (SAGIN). This paper highlights the limitations and challenges of existing technologies of air traffic communication and issues of independent CNS. The work explained that the SAGIN could not only provide the required modernization of air traffic communication but at the same time, it can provide a reliable, unified and global platform for an integrated CNS for an efficient and global ATC.