A 3-D IMAGING METHOD BASED ON PHASE-DERIVED TECHNOLOGY UNDER SQUINT MODEL

The 3-D InISAR imaging results are degraded greatly under squint model because of the interferometric phase ambiguity. However, if the size of the target is large, the existing InlSAR imaging algorithms under squint model cannot estimate the coordinates of target scatterers correctly which are not satisfied with the constraint condition of geometric between the target and radar system. Besides, they need to correct the slant-range coordinates, causing algorithm steps cumbersome. To overcome these disadvantages, a new 3-D imaging method based on phase-derived technology is proposed in this study. The angle measurement results of scatterers are obtained by phase-derived angle measurement (PDAM), in which phase-derived range measurement (PDRM) results of scatterers are used to resolve the interferometric phase ambiguity. Then, scatterers positioning by combining PDAM results and PDRM results are applied to estimate the coordinates of target scatterers which is not constrained by geometric between the target and radar system. Simulation results verified the effectiveness of the proposed method.