title: A phase and space coherent direct imaging method.
abstract: A direct imaging algorithm for point and extended targets is presented. The algorithm is based on a physical factorization of the response matrix of a transducer array. The factorization is used to transform a passive target problem to an active source problem and to extract principal components (tones) in a phase consistent way. The multitone imaging function can superpose multiple tones (spatial diversity/aperture of the array) and frequencies (bandwidth of the probing signal) based on phase coherence. The method is a direct imaging algorithm that is simple and efficient since no forward solver or iteration is needed. Robustness of the algorithm with respect to noise is demonstrated via numerical examples.
authors.affiliation: Mathematics and Statistics, Louisiana Tech University, Ruston, Louisiana 71272, USA. shou@latech.edu
authors.forename: Songming
authors.initials: S
authors.lastname: Hou
authors.forename: Kai
authors.initials: K
authors.lastname: Huang
authors.forename: Knut
authors.initials: K
authors.lastname: Solna
authors.forename: Hongkai
authors.initials: H
authors.lastname: Zhao