Civil aviation´s next generation global CNS/ATM system

Civil aviation is rapidly moving toward utilization of augmented GPS for its navigation, landing guidance and surveillance functions. However, it is now well recognized that the low level GPS signals are vulnerable to terrorist or military jamming over wide areas on Earth, and some form of backup will be required. The latest FAA plan would utilize existing VOR/DME and ILS facilities and primary/secondary radar for such backup. An examination of the augmentation systems required for the GPS aviation functions and the necessary backup systems, shows that the overall system architecture is inefficient and costly, especially the user airborne equipment. The situation has led to a study of an integrated global system concept that provides all of the CNS/ATM aviation functions (communications, navigation, surveillance and air traffic management) with security, performance and economy. The subsystems and operation of the Integrated Global Surveillance and Guidance System, which we believe to be the next generation CNS/ATM system, is described