Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1993-06-08
1996-04-23
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
342196, 342380, 342 81, H01Q 322
Patent
active
055107990
ABSTRACT:
A digital signal processing method and apparatus for beam forming utilizes an N-element phased array antenna (1). For transmit side beam forming of an agile beam to be steered in a direction between three adjacent orthogonal beams three copies of complex envelope samples for the required beam signal are generated, separately weighted in amplitude and phase (4) and fed into an N-part inverse FFT processor (3) via three input ports (7a, 7b and 7c) which correspond to the three adjacent orthogonal beams, and inverse Fast Fourier Transformed therein into the required beam as a weighted combination of the three adjacent orthogonal beams for passage to the elements (2) of the phased array antenna (1). For receive side beam detection of an agile beam received from a direction between three adjacent orthogonal beams, baseband complex envelope samples of signals received on each of the N elements (2) of the antenna (1) are input to the DFT processor (3) and discrete transformed into N orthogonal beam signals, the three orthogonal beam signals (5a, 5b and 5c) output from the processor 3 which correspond to the three orthogonal beams are separately weighted in amplitude and phase at (4) and combined into an output signal (10) which is the baseband complex envelope of the required beam signal.
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MMS Space Systems Limited
Phan Dao L.
Tarcza Thomas H.
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