Incorrect relative orbit computation for Sentinel 1

[system123]

The computation of the relative orbit for Sentinel 1 does not account for the differences in phase between the S1A and S1B orbits, and thus leads to incorrect results. The equation in the library is:

'sat:relative_orbit': int(adsHeader['absoluteOrbitNumber']['$']/175.0)

While the true formulas should be:

relOrbit_S1A = ((abs_orbit - 73) % 175) + 1
relOrbit_S1B = ((abs_orbit - 27) % 175) + 1

source: https://forum.step.esa.int/t/sentinel-1-relative-orbit-from-filename/7042/22