Journal
IEEE TRANSACTIONS ON SIGNAL PROCESSING
Volume 59, Issue 1, Pages 160-171Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TSP.2010.2084085
Keywords
Antenna array mutual coupling; antenna arrays; aperture antennas; array signal processing; direction of arrival estimation; diversity methods; nonuniformly spaced arrays; polarization
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Funding
- Hong Kong Polytechnic University [G-YG38]
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Direction-finding capability has recently been advanced by synergies between the customary approach of interferometry and the new approach of vector cross product based Poynting-vector estimator. The latter approach measures the incident electromagnetic wavefield for each of its six electromagnetic components, all at one point in space, to allow a vector cross-product between the measured electric-field vector and the measured magnetic-field vector. This would lead to the estimation of each incident source's Poynting-vector, which (after proper norm-normalization) would then reveal the corresponding Cartesian direction-cosines, and thus the azimuth-elevation arrival angles. Such a vector cross product algorithm has been predicated on the measurement of all six electromagnetic components at one same spatial location. This physically requires an electromagnetic vector-sensor, i.e., three identical but orthogonally oriented electrically short dipoles, plus three identical but orthogonally oriented magnetically small loops-all spatially collocated in a point-like geometry. Such a complicated vector-antenna would require exceptionally effective electromagnetic isolation among its six component-antennas. To minimize mutual coupling across these collocated antennas, considerable antennas-complexity and hardware cost could be required. Instead, this paper shows how to apply the vector cross-product direction-of-arrival estimator, even if the three dipoles and the three loops are located separately (instead of collocating in a point-like geometry). This new scheme has great practical value, in reducing mutual coupling, in simplifying the antennas hardware, and in sparsely extending the spatial aperture to refine the direction-finding accuracy by orders of magnitude.
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