3-D calibration of InISAR imaging under a condition of phase ambiguity

Interferometric inverse synthetic aperture radar (InISAR) imaging is a recently developed powerful radar three-dimensional (3-D) imaging technique, which combines the interferometric technique and the inverse synthetic aperture radar (ISAR). The true 3-D reconstruction of target scattering centers is obtained by interferometric phase processing of different two-dimensional (2-D) ISAR images from the various image planes. However, phase ambiguity is an involved problem in the interferometric process. This paper begins with the discussion on the InISAR imaging principle, followed by the description of three-dimensional calibration technique. By linear fitting phase differences between adjacent scattering centers of the same slant-range cell, the traditional phase ambiguity can be overcame. In the end, simulation results are provided to demonstrate the behavior of the proposed algorithm.