Adaptive Antenna Control System
Interim technical rept. no. 2, 25 Dec 1976-25 Sep 1977
SIGNATRON INC LEXINGTON MA
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This interim technical report contains a tropospheric system prediction model which can be used to predict median path loss, aperture to medium coupling loss, and 2 sigma multipath spread. The prediction model is used to determine design parameters for an angle diversity system. For a dual vertical angle diversity system the optimum beam separation is approximately 1 beamwidth and the antenna take-off angle relative to the horizon is approximately 12 beamwidth for C-band systems and 14 beamwidth for L-band systems. An analysis of long term variability and the decorrelation advantage of angle diversity is presented along with preliminary results. The prediction model is used to compare 3 specific troposcatter system examples with the result that dual spacedual angle diversity is superior in system performance over conventional dual spacedual frequency diversity. The dependence of aperture- to-medium coupling loss on carrier frequency is also investigated. The turbulent scatter theory used in the model analysis suggests that conversion of L-band systems to S-band would result in significant system improvement. Further study of available empirical data is required to validate this result.
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