Communications – electrical: acoustic wave systems and devices – Distance or direction finding – With beam steering – scanning – or focussing
Patent
1995-09-01
1997-05-06
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Distance or direction finding
With beam steering, scanning, or focussing
367901, 367119, 367905, 381 94, G01S 1500
Patent
active
056277997
ABSTRACT:
In an adaptive array beamformer, a spatial beamforming filter is connected to a sensor array for respectively filtering and summing array signals to produce a first filter output containing a target signal that arrives in a specified direction. First adaptive filters provide transversal-filtering the first filter output to produce a second filter output not containing the target signal, using a first error signal by restraining their tap weight coefficients. The array signals are further coupled to subtractors. Each subtractor detects a difference between the second filter output of the corresponding first adaptive filter and the corresponding sensor signal to derive the first error signal. Second adaptive filters provide transversal-filtering the first error signals of the subtractors to produce third filter outputs, using a second error signal, by restraining their tap weight coefficients. The third filter outputs are summed and subtracted from the first filter output to produce an output of the beamformer, which is supplied as the second error signal to the second adaptive filters
REFERENCES:
patent: 3763490 (1973-10-01), Hadley et al.
patent: 4956867 (1990-09-01), Zurek et al.
L. Griffiths et al., "An Alternative Approach to Linearly Constrained Adaptive Beamforming", IEEE Transactions on Antennas and Propagation, vol. AP-30, No. 1, Jan. 1982, pp. 27-34.
S. Nordholm et al., "The Board-Band Wiener Solution for Griffiths-Jim Beamformers", IEEE Transactions on Signal Processing, vol. 40, No. 2, Feb. 1992, pp. 474-479.
I. Claesson et al., "A Spatial Filtering Approach to Robust Adaptive Beaming", IEEE Transactions on Antennas and Propagation, vol. 40, No. 9, Sep. 1992, pp. 1093-1096.
"Processing Signals Carried By Propagating Waves", Multidimensional Digital Signal Processing, Prentice-Hall, Inc., pp. 289-315.
M.M. Goodwin et al., "Constant Beamwidth Beamforming", Proceedings of International Conference on Acoustics, Speech and Signal Processing 93, pp. I-169-I-172.
Lobo Ian J.
NEC Corporation
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