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This paper describes the ATHESA (Automatic THree-dimensional Electronic Scanned Array) technique for achieving very high antenna gain for deep-space communication systems. Phase coherence over a band of frequencies is established on reception automatically and continuously for either stationary or moving targets by phase-locking the signals from antenna elements separated by many wavelengths to a reference antenna element.
Space Electronics and Telemetry, IRE Transactions on (Volume:SET-7 , Issue: 4 )
Date of Publication: Dec. 1961