2.11.5 The Derivation of Backscattering Coefficients and RCSs in ASAR Products

ASAR detected ground range projected products will be delivered as radar brightness (i.e. elevation antenna pattern and range spreading loss corrected but no incidence angle compensation) while complex slant-range products will be delivered without any cross-track radiometric corrections.

Distributed targets backscattering coefficients sigma nought:

for ground range projected products:

eq 2.27

where:

for complex slant-range projected products:

For all complex slant-range projected products except for APS products:

eq 2.28

where:

For APS products, an additional factor (Rd/Rref) has to be taken into account:

eq 2.29

Point targets radar cross section sigma:

for ground range projected products:

eq 2.30

where:

for complex slant-range projected products:

For all complex slant-range projected products except for APS products:

eq 2.31

For APS products, an additional factor has to be taken into account:

eq 2.32