EXPERIMENTAL L- BAND SST SATELLITE COMMUNICATIONS/ SURVEILLANCE TERMINAL STUDY: VOLUME Ⅲ

摘要

The detailed analysis and tradeoff tasks are presented for both the surveillance and communications functions of an L-band aircraft terminal used with an air traffic control (ATC) satellite system, as studied under NASA/ERC contract NAS 12-621. A multisatellite concept is found preferable over single-satellite concepts to provide an ATC satellite surveil¬lance capability. Both continuous multiple-tone ranging and TRW's BINOR ranging modu¬lation techniques are evaluated for the surveillance signal in terms of link performance and impact on the aircraft terminal complexity. It is concluded that either technique provides adequate capability for required North Atlantic surveillance accuracies, although the tone system results in a simpler terminal design.nThe effect of different satellite link-routing alternates is treated and the requirements for forward and return data links established for an interrogation/response surveillance sys¬tem. Techniques of both random- and controlled-access voice channel usage for an opera¬tional system are also evaluated.