Direct imaging for extended targets From greens formula we have aGD(a, y) du aGp(a, y) ar The scattered wave received at x is Go(y, ai aG D(i, y)dy Go(ei, y aGD(aj, y) The response matrix can be written as 0(y) 9 ag(y) aGD(a1, y) aGD(N, y) T 0(y)=Go(x1,y) N, y h 防科学时太季 A Direct Numerical Imaging Method 12 National University of Defense TechnologyA Direct Numerical Imaging Method Direct imaging for extended targets 12 From Greens formula we have The scattered wave received at xj is The response matrix can be written as