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opera-adt / COMPASS

COregistered Multi-temPorAl Sar Slc
Apache License 2.0
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Remove azimuth carrier and add flattening ramps for AGE #146

Closed vbrancat closed 1 year ago

vbrancat commented 1 year ago

This PR has been successfully tested to compute the absolute geolocation for Rosamond. It is awaiting further development in COMPASS .

This PR adds the options to:

  1. Remove the azimuth carrier phase ramp (for CSLC-S1 only)
  2. Add back the flattening phase ramp

when analyzing the absolute geolocation performance of CSLC-S1 products. At the moment, the implementation supports CSLC-S1 only and will include CSLC-NI (GSLC) in a later stage.

According to our analyses:

  1. Azimuth carrier ramp needs to be added back to CSLC-S1 to have meaningful interferograms. Therefore, the ramp should be removed when computing AGE as it affects AGE performance
  2. As per current baseline, CSLC-S1 (and NISAR GSLC) will be flattened. Flattening phase ramp needs to be added back to avoid aliasing prior to oversampling the peak for AGE determination
vbrancat commented 1 year ago

@seongsujeong @LiangJYu can you please review this PR? Thanks