Fast Localization Schemes for Wideband Sources

• Main Authors: Chih-Ben Huang, 黃知本
• Other Authors: Hsien-Sen Hung
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/89842654282372449672

碩士 === 國立臺灣海洋大學 === 電機工程學系 === 92 === Abstract Direction-of-arrival (DOA) estimation of signal sources based on antenna or hydrophone array has been extensively explored in the areas of radar, communication and sonar. Its research trend gradually moves from narrowband signals to wideband signals. In the literature, there are several high resolution techniques developed for DOA estimation of wideband signals, but wideband signal processing using focusing schemes requires preliminary DOA estimate, thus resulting in perfor- mance sensitive to the estimation errors. In the thesis, we first adopt the signal subspace focusing method (SSF) for DOA estimation of wideband sources, which does not require preliminary DOA estimates. Then, we develop two methods which combine column vector focusing (CVF) with fast polynomial rooting. Using these methods, we can avoid the eigenvalue decomposition in each frequency bin as required when each signal subspace in SSF is estimated and reduce order of polynomial rooting . Unlike Root MUSIC that uses a polynomial with an order determined by the number of sensors, each of them exploits a polynomial with only signal-related roots, therefore greatly reducing the computational complexity. Finally, computer simulations are provided to compare the performances of SSF or CVF based methods for the DOA estimation of wideband sources. Keywords : direction of arrival, array signal processing, wideband signal, near field, focusing matrix.