Doppler Centroid Estimation of Sentinel-1 TOPS L1 level data

Microwave Toolbox Problem Reports
#1

Dear Guys

I planed to use Sentinel-1 TOPS L1 Level data to estimate the radical velocity of ocean surface.
Now I have estimated the observed Doppler centroid Fd1 based on L1 level data.
Then the geometrical Doppler frequency Fdg should be found in the aux clm files.
My problem is how to calculate the geometrical Doppler offset, when the geometric Doppler coefficients could be obtained.
Looking forward to your help.

Thanks.

Liu Lei