I had calculated the phase interferometry from and it works very good.

my question is how snap calculate the imaginary and real parts.
the ones used for the phase calculation are showed in the figure.
i_ifg_VV_07Nov2017_19Nov2017
q_ifg_VV_07Nov2017_19Nov2017

The master image= (i & q)_master is multiplied pixel-wise with the complex conjugate of the slave= (i & -q)_slave so that you end up with the interferogram= (i & q)_interferogram.

where m is the master image, s is the slave (both complex numbers) and * designate the conjugate. Expanding the expression of the hadamart product, we have