Convert pixel coordinates to latitude, longitude with the Sentinel-1 image


I am trying to convert pixel coordinates to the geographical latitude, longitude. I am following steps, previously describe in this discussion: #51

However, I cannot retrieve information about CRS, coordinates of upper left corner and resolution.
I use rasterio:

src =     
transform = src.transform 

But it seems like the standard GeoTIFF Sentinel-1 format does not contain the necessary information and transformation matrix looks like this:

print("Affine Transform:", transform)
Affine Transform:
 | 1.00, 0.00, 0.00|
| 0.00, 1.00, 0.00|
| 0.00, 0.00, 1.00|

Any ideas how to solve this problem?

Thank you a lot in advance for your help!