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What is the motivations to make mater degree i direction finder and direcion of arrival?

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The motivation behind developing direction finders and estimating the direction of arrival lies in the need for accurate signal processing in the presence of interferences and noise. Researchers propose methods utilizing digital filters, correlation detectors, and phase-based systems to enhance direction estimation. These systems aim to compensate for frequency-dependent attenuation, detect interference signals, and determine radio wave arrival directions with precision. By utilizing complex random numbers, covariance matrices, eigenvalues, and eigenvectors, these direction finders can estimate wave angles even in the presence of errors in array manifolds. The ultimate goal is to create lightweight, portable, and efficient systems for accurately determining the arrival direction of signals in various environments.

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Patent Simplified direction finder Okubo Takehiko 18 Feb 1988 4 Citations	The motivation behind developing the "Simplified Direction Finder" is to determine the arrival direction of radio waves without synchronous rectification, achieved by switching signals from two antennas based on phase differences.
Patent Direction detection apparatus Ohashi Yoshimasa, Yamada Toshiyuki, Seo Takeshi, Yanagisawa Motoi - Show less +3 more 26 Mar 1996 1 Citations	The motivation for developing the direction detection apparatus is to accurately estimate the angle of a wave source despite errors in the array manifold, enhancing direction finding and arrival angle estimation.
Proceedings Article•DOI Direction finding of broadband signals for frequency-selective fading channels Mohammad Ghavami, Ryuji Kohno - Show less +1 more 01 Dec 1999 1 Citations	The motivation for developing a direction finder for broadband signals is to estimate the angle of arrival in frequency-selective fading channels, compensating for attenuation and interference, enhancing precision in estimation.
Patent Simple direction finder Sato Nobuo, Miwa Katsuji - Show less +1 more 27 Jun 1986 2 Citations	The motivation behind creating a portable direction finder is to determine radio wave arrival direction by analyzing phase differences in signals induced in non-directional antennae, aiding in navigation and communication.
Patent Direction of arrival estimator and direction of arrival estimation method Yasuaki Yuda, Fukagawa Takashi, Youichi Nakagawa, Masahiro Mimura - Show less +3 more 02 May 2001 12 Citations	Not addressed in the paper.

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