A shared satellite system would satisfy many future aviation needs

The development of a continental mobile satellite system for aircraft communication is proposed. The system is to provide communication and surveillance for air traffic control and aeronautical operational control. The two-satellite ranging and position fixing of the satellite system are analyzed. The system architecture requires consideration of satellite earth coverage, a frequency and polarization plan, satellite and mobile power and power density, and modulation standards. The use of spot beams and frequency reuse is examined, and diagrams of coverage areas and frequency reuse are presented. Examples of aviation system and mobile satellite system frequency plans are provided. Differences in satellite characteristics, such as antenna gain, transmitter powers and receiver sensitivities, and mobile antenna gains and powers are discussed. The components and requirements for a typical satellite transponder concept, in particular an aircraft-mounted antenna, are described.