Woodward-Lawson-Butler beams
a = woodward(A, alt)
N-dimensional row vector of beam amplitudes
0,1 for standard or alternative half-integer DFT frequencies
N-dimensional row vector of array weights
woodward(A, alt) designs Woodward-Lawson-Butler beams. essentially, a = IDFT(A,N), can be considered a special case of MULTIBEAM with uniform window and N beams at steering angles phk = acos(k/d*N), so that psk = 2*pi*d*cos(phk) = 2*pi*k/N = DFT frequencies. the k-th Butler beam can be turned on by choosing A(i) = delta(i-k). for frequency-sampling design, a(n) must be windowed by a window w(n).
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