Concept of the Coherent Autofocus Map-Drift Technique

The paper presents concept of the coherent autofocus map-drift technique. The main goal of this work is to obtain high accuracy and sensitivity for autofocus technique in strip-mode SAR. Presented technique is based at the well-known noncoherent map-drift algorithm and it also takes advantages of multi-look registration to estimate unknown platform velocity component. At the proposed coherent map-drift technique, opposite to the classical map-drift, the cross-correlation is not carrying out at the image intensity from multi-look processing, but at the complex multi-look image data.