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Spread Spectrum Acquisition and Tracking Performance for Shuttle Communication Links

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4 Author(s)
Alem, W. ; Axiomatix, Los Angeles,CA ; Huth, G.K. ; Holmes, J. ; Udalov, S.

The spread spectrum acquisition and tracking performance for the Shuttle S -band and Ku -band communication links are analyzed and compared to test results. The S -band link requirements are more severe than those of the Ku -band links, hence, different despreader designs were developed for the two systems. The S -band despreader acquires pseudonoise code lock by examining all possible code phases in half chip steps while the Ku -band despreader acquires pseudonoise code lock by continuously sweeping a tau-jitter loop. Both despreaders employ a tau-jitter loop for code tracking. The code tracking performance is computed for the tau-jitter loop and compared to that of the more complex delay lock loop.

Published in:

Communications, IEEE Transactions on  (Volume:26 ,  Issue: 11 )