Experimental Study of Adaptive Wideband Interference Cancellation

• Main Authors: Shih-Chien Lin, 林世健
• Other Authors: Ta-Sung Lee
• Format: Others
• Language: zh-TW
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/38156096505867582034

碩士 === 國立交通大學 === 電信研究所 === 82 === In this thesis, we propose the use of high-resolution spatial spectrum estimators, such as cross-spectral density matrix (CSDM) MVDR and steered covariance matrix MVDR (STMV), for localizing wideband underwater acoustical sources with a hydrophone array. These methods are employed in accordance with the frequency and spatial domain properties of the array signals. We also propose the use of wideband adaptive beamformers, such as coherent signal-subspace method based MVDR (CSM-MVDR) and the interpolated Duvall CSM-MVDR (IDCSM-MVDR) beamformers, for desired signal acquisition and interference cancellation. We confirm, via computer simulations and real data analyses, that the IDCSM-MVDR method working in conjunction with STMV is an appropriate way of implementation. Compared with the conventional delay-and-sum method, the proposed one exhibits better resolution and interference rejection capability.