Advanced Communications Systems Support. Air/Ground Radio Antenna System (Analysis and Evaluation).

摘要

Phase II is an in-depth antenna sub-system follow-on effort of the Phase I study. Phase I examined the requirements for an integrated air/ground communications facility, thereby establishing the basis for the detailed investigations of Phase II into advanced communications antennas. The present study further develops the cost-effective Phase I plans to colocate radio facilities and to consolidate radio equipments within radio line-of-sight constraints. The analysis examines the performance capabilities and factors of several prevailing types of VHF and UHF antennas which appear at the offset to affect cosited antenna locations and colocated radios, i.e., to establish and demonstrate through appropriate examples, the separate influences of: (1) available radio signal margins, (2) vertical antenna pattern lobing effects, (3) horizontal pattern distortion, (4) radio frequency interferences, and (5) aircraft antenna patterns. It is concluded from experimental and analytical work that current RCAG facilities may use modified antenna systems to support up to 15 communications channels and to provide secondary and gap-filler coverages; that multi-couplers and combiners can be used very effectively; that RFI can be minimized; and that more extensive investigations appear justified in analysis, design, and development applications. (Author)