Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1979-08-20
1981-03-03
Gruber, Felix D.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
364514, 364728, 367121, 343854, G01S 380, G01S 754, G06F 1534
Patent
active
042544173
ABSTRACT:
A frequency-domain beamformer is used with arrays comprising M rings with a maximum of N elements per ring, the positions of the elements having rotational symmetry. An element need not be present at each position. The outputs of each of the M rings of arrays are connected to the inputs of M sets of lowpass filters, each set comprising N filters. Each filter output is an input to a sample-and-hold circuit.
A temporal discrete Fourier transform (DFT) is performed on the output signal from each sample-and-hold circuit. M demultiplexers, one for each of the M sets of DFT circuits, convert their parallel input signals into serial output signals.
A memory, or function generator, is used for steering. A circular convolver convolves the outputs of the demultiplexers and the memories, the outputs of the convolvers being summed in an output summer.
The beamformer is used with a 3-D array such that it has rotational symmetry, that is, if rotated at some angle, the situation is exactly the same as before the rotation.
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Gaubatz: FFT-Based Analog Beamforming Processor, 1976 Ultrasonics Symposium roceedings, IEEE Cat. No. 76-CH1120-5SU Annapolis Md., Oct. 1976, pp. 676-681.
AGARWAL et al.: Fast One-Dimensional Digital Convolution by Multidimensional Techniques, IEEE Transactions on Acoustics, Speech, and Signal Processing vol. ASSP-22, No. 1, Feb. 1974, p. 1-10.
Gruber Felix D.
Johnston Ervin F.
Sciascia Richard S.
Stan John
The United States of America as represented by the Secretary of
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