NDLI: Extension of Orchard's pattern synthesis technique for overdetermined systems

Content Provider	IEEE Xplore Digital Library
Author	Ares, F. Rengarajan, S.R. Vieiro, A. Moreno, E.
Copyright Year	1995
Description	Author affiliation: Dept. de Fisica Aplicada, Santiago de Compostela Univ., Spain (Ares, F.)
Abstract	The problem of synthesizing antenna patterns with controlled nulls has been extensively studied in the literature. Prescribed nulls in the radiation pattern can be used to suppress interferences from specific directions. The need for a broad antenna null often arises when the direction of arrival of the unwanted interference may vary slightly with time or may not be known exactly, and where a comparatively sharp null would require continuous steering for obtaining a reasonable value for the signal-to-noise ratio. The SVD algorithm is useful in solving under and overdetermined systems of linear equations. This method is used to solve an overdetermined system obtained from that of the Orchard (1985) method (of linear array pattern synthesis) wherein several extra equations are introduced to obtain patterns with fixed nulls and to control the width of some angular regions of interest. In order to test the precision of this proposed method, comparisons with other optimization methods have been carried out. A cost function was built, as the squared difference between the desired and obtained pattern, as a function of the root displacements. The Fletcher-Powell (variable metric) and the Polak-Ribiere (conjugate gradient) methods were used to optimize the cost function.
Starting Page	1834
Ending Page	1837
File Size	239672
Page Count	4
File Format	PDF
ISBN	0780327195
DOI	10.1109/APS.1995.530943
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-06-18
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Equations Optimization methods Cost function Antenna radiation patterns Interference suppression Directive antennas Signal to noise ratio Control system synthesis Signal synthesis Testing
Content Type	Text
Resource Type	Article

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