Before considering in any detail the importance of precise navigation to air traffic control, or attempting to define the word ‘precise’ in this context, it seems desirable to go back to fundamentals and consider certain essential characteristics of a volume of traffic flowing between individual pairs of airports in a system comprising a large number of such airports, randomly distributed and heavily loaded.
This paper gives an overview on communications system based and global navigation satellite system (GNSS) based navigation. Starting from the physical layer model of a mobile communications or navigation receiver, we highlight similarities and differences between the two receivers. We explain navigation principles for timing measurements and present the possible navigation accuracies of different communications systems and GNSSs. Finally, we examine synergies of combined receivers and systems.
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