Short-range synthetic aperture imaging at 633 nm by digital holography.
We present an active optical synthetic aperture-imaging system. A phase-step digital holographic setup is used as a wavefront sensor in the far field. The overlap of the holograms enables the estimation and compensation of their relative positions and phase with a speckle cross-correlation algorithm. Experimental results on a short-range synthetic aperture setup at 633 nm are presented that are based on 128 x 128 holograms. The synthesis is executed in one direction by means of rotation of the object. Test images show a significant gain of resolution in the synthesis direction. Processing errors are estimated through experiment. Random processing errors of a synthetic pupil composed of 33 merged holograms are negligible, but biases induced by unknown optical aberrations ofthe reference wave induce defocusing and astigmatism.
Binet
Renaud
R
Thales Research and Technology, Domaine de Corbeville, Orsay, France. renaud.binet@thalesgroup.com
Colineau
Joseph
J
Lehureau
Jean-Claude
JC