I am new in radar and I have a naive doubt. As explained in
Moreira, Alberto, et al. “A tutorial on synthetic aperture radar.” IEEE Geoscience and remote sensing magazine, (2013)
“The received echo signal data form a two-dimensional data matrix of complex samples, where each complex sample is given by its real and imaginary part, thus representing an amplitude and phase value.”
But I also read that in SNAP, to derive the amplitude and the phase from the i,q layers, one should apply these equations:
The amplitude = sqrt(i^2 + q^2)
The phase = arctan (i / q)
(What does Bands specify in SNAP toolbox?)
So i and q are not just amplitude and phase? In Sentinel -1 SLC there is already a Virtual intensity band. How is it derived?