Interferometric synthetic aperture radar(InSAR)is a principal method for terrain height measurement,facili-tating the acquisition of elevation data for ground targets and enabling the comprehensive three-dimensional perception of intricate terrain and topography.Owing to its flexible baseline characteristics,the distributed InSAR system can dy-namically change the baseline configuration,breaking through the baseline limitations of single-station multi-channel In-SAR.This adaptability caters to diverse terrains,enhancing the accuracy of elevation inversion and taking a prominent role in geographical mapping,resource survey,reconnaissance,and early warning.Presently,InSAR systems predomi-nantly rely on spaceborne formations,limiting configuration significantly.Several studies have focused on airborne sys-tems;however,the existing methods are predominantly based on two stations with a single baseline configuration,which exhibits low inversion accuracy,particularly for complex and steep terrains.In response to this shortcoming,we propose a distributed multi-baseline UAV-borne InSAR elevation inversion system based on hybrid baselines,along with improvements in InSAR technology to adapt to the proposed novel architecture.This study establishes the geometric con-figuration of the distributed multi-baseline UAV InSAR system and derives the principle underlying the elevation inver-sion of the system.Subsequently,the technical advantages of this system in phase unwrapping under flexible configura-tion scenarios are compared with those of existing systems,and its implementation method is derived.Theoretical argu-ments are presented to demonstrate the suitability of the proposed flexible configuration interferometric system for com-plex and steep scenarios.Finally,through simulation experiments conducted on both simulated terrain and real moun-tainous terrain,this study attained elevation inversion of ground object scenes using the distributed multi-baseline UAV-borne InSAR system,thereby validating the feasibility of the technology.Additionally,this study leveraged a compara-tive analysis with existing systems to highlight the superiority of the proposed system in terrain elevation information in-version for complex terrains.
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维普
