Publication Date:
2014-12-16
Description:
This paper deals with coherent processing of time reversal operator for microwave imaging in the frequency-domain. In frequency-domain time-reversal imaging approach, images obtained for different frequency bins over ultrawideband are incoherently processed. In highly dense and cluttered medium the signal subspace over each narrow frequency bin varies from that obtained using the complete ultrawideband. As a result, the detection and localization from non-coherent imaging approach is often inconclusive. In order to improve the stability of time-reversal microwave imaging, we propose coherent processing using novel focusing matrix approach. The proposed focusing matrix makes possible the time-reversal imaging technique to coherently process each frequency bin to yield a consistent signal subspace. The performance of coherent focusing is investigated when combined with time-reversal robust capon beamformer (TR-RCB). We have used numerical experiments on breast cancer detection using FDTD employing anatomically realistic numerical breast phantoms that contain varying amounts of dense fibro-glandular tissue content. The imaging results indicate that the proposed Coherent-TR-RCB (C-TR-RCB) could overcome the limitations of time-reversal imaging in a highly heterogeneous and cluttered medium.
Print ISSN:
0048-6604
Electronic ISSN:
1944-799X
Topics:
Geosciences
,
Physics
