Journal
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
Volume 60, Issue -, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TGRS.2022.3210437
Keywords
Strain; Coherence; Time series analysis; Azimuth; Interferometry; Delays; Signal to noise ratio; Along-track deformation; burst overlap interferometry (BOI); Chaman fault; decorrelation; ionosphere; strain model
Categories
Funding
- Singapore MOE [MOE2019-T2-1-182]
- Earth Observatory of Singapore from the National Research Foundation Singapore
- Singapore Ministry of Education under the Research Centers of Excellence Initiative
- National Natural Science Foundation of China [42274038]
- China Scholarship Council [202006710013]
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Obtaining millimeter-scale along-track deformations using phase measurements is a challenging task for the InSAR community. In this study, a new time series burst overlap interferometry algorithm is proposed to improve measurement accuracy and achieve high precision along-track deformation measurements.
How to obtain millimeter-scale along-track deformations using phase measurements is still a pending question for interferometric synthetic aperture radar (InSAR) community. Although burst overlap interferometry (BOI) technique makes this question seem tractable, most applications of BOI still focus on extracting centimeter-scale deformations for coseismic cases. To further improve measurement accuracy, here we propose a new time series BOI algorithm toward maximizing the performance of BOI and obtaining as high accuracy of the along-track deformations as possible. This algorithm has three major steps. The first step is to enhance BOI phase signal-to-noise ratio (SNR) using our newly proposed phase estimator. In the second step, we apply a strain model-based method to further suppress the phase noise and rescue more data points. In the third step, a misregistration correction procedure which considers plate motion is applied to mitigate BOI time series bias. We tested our proposed algorithm over the Chaman fault. Although the derived millimeter-scale deformations demonstrate the effectiveness of our method, experimental results show that decorrelation and ionospheric disturbance are still two great challenges of BOI techniques.
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