Title :
Weighted least squares DORT method in selective focusing
Author :
Nguyen, Dinh-Quy ; Gan, Woon-Seng ; Chong, Yong-Kim
Author_Institution :
Digital Signal Process. Lab., Nanyang Technol. Univ., Singapore
Abstract :
The DORT (decomposition de lpsilaoperateur de retournement temporel) method is an efficient technique to focus signal on the target. The DORT method requires the measurement of the inter-element impulse responses of the propagating medium for all pairs of elements in the array. The time reversal operator (TRO) is deduced and diagonalized from these responses. But DORT method has worse results in non-ideally resolved scatterer case that two scatterers are placed close with each other. Therefore, in this paper, weighted least-squares (WLS) combining with the DORT method are proposed to perform selective focusing in non-ideally resolved scatterer case. This technique can also perform target focusing with higher spatial resolution than original DORT method and faster computation than adaptive beamforming method.
Keywords :
array signal processing; least mean squares methods; transient response; adaptive beamforming method; decomposition de lpsilaoperateur de retournement temporel; higher spatial resolution; interelement impulse responses; propagating medium; selective focusing; target focusing; time reversal operator; weighted least squares DORT method; Acoustic scattering; Acoustic waves; Array signal processing; Eigenvalues and eigenfunctions; Gallium nitride; IEEE members; Least squares methods; Mirrors; Spatial resolution; Transmission line measurements; Adaptive beamforming; decomposition of the time reversal operator (DORT) method; time reversal (TR) and weighted least-squares (WLS);
Conference_Titel :
Sensor Array and Multichannel Signal Processing Workshop, 2008. SAM 2008. 5th IEEE
Conference_Location :
Darmstadt
Print_ISBN :
978-1-4244-2240-1
Electronic_ISBN :
978-1-4244-2241-8
DOI :
10.1109/SAM.2008.4606864
