Calibrator Phase Error Compensation Method for Accuracy Validation of GNSS-Based InBSAR System

TY - JOUR

T1 - Calibrator Phase Error Compensation Method for Accuracy Validation of GNSS-Based InBSAR System

AU - Li, Yuanhao

AU - Xu, Zhixiang

AU - Liu, Feifeng

AU - Deng, Yunkai

AU - Cui, Rongyi

AU - Wang, Zhanze

N1 - Publisher Copyright: © 2026 IEEE.

PY - 2026

Y1 - 2026

N2 - Global Navigation Satellite System-based synthetic aperture radar interferometry (GNSS-based InBSAR) can achieve 3-D deformation monitoring of the scene by deploying receivers on the ground to receive navigation signals reflected from the scene. However, the deformation monitoring accuracy of this system has not been fully verified, and it is necessary to conduct cross-system joint experiments based on a calibrator to verify the accuracy. In this letter, a joint calibrator integrating differential GNSS (D-GNSS), ground-based SAR (GB-SAR), and GNSS-based InBSAR is designed. The phase error compensation method for the calibrator is proposed for GNSS-based InBSAR. First, the composition of the calibrator is introduced, and a corresponding signal model for GNSS-InBSAR is established. Then, compensation is performed for the antenna positioning error, offset phase, and atmospheric phase, respectively. Finally, by jointly comparing the true deformation values of the displacement stage with the results of D-GNSS, GB-SAR, and GNSS-based InBSAR, it is demonstrated that the 3-D deformation monitoring accuracy of the GNSS-based InBSAR can reach 2.6, 3.2, and 5.3 mm.

AB - Global Navigation Satellite System-based synthetic aperture radar interferometry (GNSS-based InBSAR) can achieve 3-D deformation monitoring of the scene by deploying receivers on the ground to receive navigation signals reflected from the scene. However, the deformation monitoring accuracy of this system has not been fully verified, and it is necessary to conduct cross-system joint experiments based on a calibrator to verify the accuracy. In this letter, a joint calibrator integrating differential GNSS (D-GNSS), ground-based SAR (GB-SAR), and GNSS-based InBSAR is designed. The phase error compensation method for the calibrator is proposed for GNSS-based InBSAR. First, the composition of the calibrator is introduced, and a corresponding signal model for GNSS-InBSAR is established. Then, compensation is performed for the antenna positioning error, offset phase, and atmospheric phase, respectively. Finally, by jointly comparing the true deformation values of the displacement stage with the results of D-GNSS, GB-SAR, and GNSS-based InBSAR, it is demonstrated that the 3-D deformation monitoring accuracy of the GNSS-based InBSAR can reach 2.6, 3.2, and 5.3 mm.

KW - Calibrator

KW - Global Navigation Satellite System-based synthetic aperture radar interferometry (GNSS-based InBSAR)

KW - error compensation

KW - interferometric phase model

UR - https://www.scopus.com/pages/publications/105032790682

U2 - 10.1109/LGRS.2026.3673223

DO - 10.1109/LGRS.2026.3673223

M3 - Article

AN - SCOPUS:105032790682

SN - 1545-598X

VL - 23

JO - IEEE Geoscience and Remote Sensing Letters

JF - IEEE Geoscience and Remote Sensing Letters

M1 - 4006205

ER -