Direct imaging for extended targets Imaging function g(c Where the shape space V=span(vi,v2,,VMlthe leading SVs) the noise space VN: the orthogonal complement of vs (過两科学大季 A Direct Numerical Imaging Method National University of Defense TechnologyA Direct Numerical Imaging Method Direct imaging for extended targets 13 Imaging function 2 1 ( ) ( ) N V I x P g = v x where • the shape space VS = span{v1 ,v2 ,…,vM}(the leading SVs) • the noise space VN: the orthogonal complement of VS