Data-driven clock drift compensation for airborne bistatic SAR

Abstract:
This paper presents our latest bistatic SAR interferograms obtained from our airborne systems at L-band, acquired under the scope of the BelSAR project. The results are obtained after applying a multisquint-based approach to remove the phase errors caused by clock-drift and baseline inaccuracies. We observe that the phase induced by the clock drift are not range-dependent as the baseline error. Therefore, we estimate from the spectral diversity phase a non-range dependent phase profile along cross-range dimension and afterwards we estimate the two components of the baseline errors. The implemented multisquint is integrated with the actual backprojection processor used to focus the bistatic data. First results show that we are able to remove both the mis-synchronization errors and baseline errors and generate fully synchronized interferometric data from our non-cooperative airborne bistatic system and support future campaigns for non-cooperative bistatic SAR constellations.