Impact Factor:4.848
DOI number:10.3390/rs12020233
Journal:Remote Sensing
Key Words:Synthetic aperture radar interferometry; InSAR baseline estimation; flat-earth phase; baseline refinement.
Abstract:Interferometric baseline estimation is a key procedure of interferometric synthetic aperture radar (SAR) data processing. The error of the interferometric baseline affects not only the removal of the flat-earth phase, but also the transformation coefficient between the topographic phase and elevation, which will affect the topographic phase removal for differential interferometric SAR (D-InSAR) and the accuracy of the final generated digital elevation model (DEM) product for interferometric synthetic aperture (InSAR). To obtain a highly accurate interferometric baseline, this paper firstly investigates the geometry of InSAR imaging and establishes a rigorous relationship between the interferometric baseline and the flat-earth phase. Then, a baseline refinement method without a ground control point (GCP) is proposed, where a relevant theoretical model and resolving method are developed. Synthetic and real SAR datasets are used in the experiments, and a comparison with the conventional least-square (LS) baseline refinement method is made. The results demonstrate that the proposed method exhibits an obvious improvement over the conventional LS method, with percentages of up to 51.5% in the cross-track direction. Therefore, the proposed method is effective and advantageous.
Indexed by:Journal paper
Document Code:233
Discipline:Engineering
First-Level Discipline:Surveying and Mapping
Document Type:J
Volume:12
Issue:2
Page Number:233
Translation or Not:no
Included Journals:SCI
Links to published journals:https://www.mdpi.com/2072-4292/12/2/233