Time reversal DORT and MUSIC methods for extended targets detection and imaging

摘要

In this paper, the imaging methods with transmitting-mode electromagnetic DORT and TR-MUSIC for extended targets applications are proposed. The full-wave analysis of the multiple scattering models is carried out, and its eigenvalue system and pesudospectrum definition are discussed in detail. Compared with the echo-mode cases, the superiority is realized as follows. Firstly, it leads to more accurate location and higher imaging resolution because the noncoincident arrays actually increase the effective aperture of the array; secondly, the proposed algorithms are proved to be more flexible and practical; furthermore, it enlarges the coverage area of the detection system due to the reciprocal mapping between the transmitter and receiver spaces. Therefore, it suggests the great potential in the areas of extended targets detection, through-wall radar imaging and medical examinations.