Research on Dual-Channel InWasSAR System Non-Prior Information 3D Reconstruction Method

To address the challenge of 3D reconstruction without prior information in complex scenes, this paper presents a high-precision 3D reconstruction method based on dual-channel interferometric wide-angle staring SAR (InWasSAR). The method generates a coarse 3D scene model through multi-view observations of single-channel wide-swath staring SAR (SCWasSAR), which serves as a constraint for phase unwrapping in dual-channel interferometric SAR (InSAR), eliminating the reliance on external digital elevation models (DEM). Firstly, subaperture imaging and iterative optimization are employed to obtain a coarse 3D point cloud. Subsequently, interferometric phase ambiguities are filtered using geometric consistency criteria, and precise 3D coordinates are calculated by integrating radar parameters. Airborne field experiments in the complex terrain of Weinan mountainous area, Shaanxi Province, demonstrate that the proposed method achieves high-precision reconstruction without prior information. The findings provide a new approach for 3D information acquisition in complex environments, holding significant application value in fields such as topographic mapping and disaster monitoring.