A phase and space coherent direct imaging method.
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.
Hou
Songming
S
Mathematics and Statistics, Louisiana Tech University, Ruston, Louisiana 71272, USA. shou@latech.edu
Huang
Kai
K
Solna
Knut
K
Zhao
Hongkai
H