Impact of Satellite Aeronautical Channel on Modem Specifications: Phase II: Oceanic Multipath Measurements and Modem Concepts
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1975-01-01
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Abstract:This report completes the analysis initiated in the Phase I report of the effects of oceanic multipath on ranging and data modems for satellite air traffic control systems. The interaction between multipath antenna and apparent measured multipath is determined using a "vector Kirchoff" model and ocean scattering. Procedures for antenna design, seas state sensing, and multipath measurements are detailed, and tone raning performance is computed for various antenna designs. Consideration is given to the problem of tone probing on a 50 KHz hard limiting AEROSAT channel while data transmission is taking place. The problem of how much measurement of error probability in data transmission over the AEROSAT channel is addressed. It is also shown that with the proper integration of coding and modulation techniques, it is possible to construct a robust signaling scheme which is insensitive to the multipath and which can improve performance when operating in the region of low direct path signal-to-noise ratios.
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Content Notes:Introduction, Interaction between antenna chracteristics, Simultaneous data transmission and tone probing through a hard limiter, Percentage measurement error for measurement of error rate in ricean channels, Coding and modulation concepts for aeronautical channels, Appendices
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