The constrain matrix c n:=n+1 F h(t,x,y) No ho) hidl Ye FT3D utput Fs HnU, k, k,) h(t, x, y) FKK constrai txy constrain 0 k k,, k,) HU,k, k, IFT3D 防科学时太季 A Direct Numerical Imaging Method 26 National University of Defense TechnologyA Direct Numerical Imaging Method The constrain matrix C 26 FKK constrain ( )( , , ) n h t x y ( )( , , ) x y n H f k k FT3D ( )( , , ) x n H f k ky ( )( , , ) x n H f k ky IFT3D ( )( , , ) n h t x y txy constrain n:= n+ 1 Y/N ( ) ? n id h h Yes output No