Based on the minimum field strength requirement within the whole GBAS service volume, this paper performs nominal
link power budget for GBAS VHF data broadcast (VDB) system, and the required power transmitted from VDB system
is derived. The paper elaborates the requirement of Desired-to-Undesired (D/U) signal ratio for a specific VHF airborne
receiver to ensure the normal operation by the test, and presents the experimental method and results for acquiring the
D/U signal ratios. The minimum geographical separations among GBAS, VOR and ILS stations are calculated according
to the specifications of these three kinds of navigation systems.
Based on the analysis of the MIL-STD-1773 data bus modulation scheme, two optical modulation schemes are proposed for designing this kind of data bus, namely, partial tri-level Manchester II bi-phase coding (PTMBC) and extended Manchester II bi-phase coding with beginning-stopping flags (EMBC-BSF), which can efficiently solve the problem related to three outputs at a MIL-STD-1773 optical receiver with low complexity. Then we focus on the analysis of error probability and optical receiver sensitivity for MIL-STD-1773 data buses with three modulation schemes of Manchester II bi-phase coding, PTMBC , and EMBC-BSF. The results show that both the PTMBC and EMBC-BSF modulation schemes have almost the identical and worse receiver sensitivity than that of the Manchester bi-level coding by ~3dB.
KEYWORDS: Receivers, Error analysis, Optical fibers, Modulation, Optical engineering, Signal to noise ratio, Communication engineering, Error control coding, Fiber optic communications, Data communications
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