Dear Ahmed Azouz,

Please try this code, and tell me if there is any problem.

raw = load('name_of_the_image');

fn = fieldnames(raw); Raw_data = getfield(raw,fn{1});

size_azimuth = size(Raw_data,1); size_range = size(Raw_data,2);

I solve problem :

1-Article SAR image formation scheme implementation and endorsement sp...

2-

https://www.mathworks.com/matlabcentral/fileexchange/128178-unpacking-sentinel-1-level-0-header-and-raw-data