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EMTTOOL >> EMTTOOL > woodward

woodward

Woodward-Lawson-Butler beams

Calling Sequence

a = woodward(A, alt)

Parameters

A

N-dimensional row vector of beam amplitudes

alt

0,1 for standard or alternative half-integer DFT frequencies

a

N-dimensional row vector of array weights

Description

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).

Examples

add sample pgm

See Also

Author

vprop EMTTOOL z2g