Subaperture high-order autofocus using reverse phase

摘要: A high-order synthetic aperture radar (SAR) autofocusing method decomposes phase error into basis function components, one order at a time. Image patches are partitioned plurality of subapertures in accordance with positive- and negative-going slope the each order. positive mask is applied to subaperture within which increasing slope, whereas negative decreasing slope. The results then correlated obtain focused image, principle map-drift preferably being used compute phase-amplitude weights. may be uniformly applied, enabling steps performed increasingly higher orders without performance degradation.