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 -