Remote Sensing for Natural Resources >
Deformation monitoring using time-series InSAR with dual-polarization optimization
Received date: 2024-10-19
Revised date: 2025-01-23
Online published: 2026-06-03
The spatial density and interferometric phase quality of high-quality monitoring points serve as key indicators for deformation monitoring using the time-series interferometric synthetic aperture radar (InSAR) technique. To further enhance the deformation monitoring ability of the InSAR technique for non-urban areas, this study proposed a polarization time-series InSAR method that takes into account distributed scatterers (DSs) using dual-polarization images from Sentinel-1. Specifically, polarization processing of the intensity and phase information of time-series SAR data was conducted using various methods based on the characteristics of DSs and taking the dispersion of amplitude (DA) as an indicator for the phase quality assessment. Then, surface deformation monitoring was performed using the data before and after optimization. This study carried out experiments on Ningbo City in Zhejiang Province using 40 scenes of dual-polarization (VV-VH) images from Sentinel-1. The results indicate that the proposed method can significantly increase the density of monitoring points and the interferometric phase quality. Compared to single polarization, the proposed method increased the quantities of persistent scatterers (PSs) and DSs by about 20% and 57.5%, respectively. Furthermore, the interferometric phase quality was also significantly improved, with the average coherence increasing by more than 15%. The proposed method allows for a more detailed reflection of regional deformations.
XUAN Jiabin , LI Ruren , FU Wenxue . Deformation monitoring using time-series InSAR with dual-polarization optimization[J]. Remote Sensing for Natural Resources, 2025 , 37(6) : 128 -137 . DOI: 10.6046/zrzyyg.2024346
μ=ω†k,
表1 不同阈值下选取的PS点数量Tab.1 Number of PS points selected under different thresholds |
| 方法 | 指标范围 | |||
|---|---|---|---|---|
| 0~0.2 | 0~0.3 | 0~0.4 | 0~0.5 | |
| VV | 1 969 | 10 797 | 35 874 | 92 982 |
| OPT | 2 592 | 13 573 | 42 976 | 107 726 |
| (OPT-VV)/VV (↑) | 31.6% | 25.7% | 19.8% | 15.9% |
表2 干涉图质量评价结果Tab.2 Interferogram quality evaluation results |
| 干涉图 | 长时间基线(20230103—20220201) | 短时间基线(20230103—20221128) | ||||
|---|---|---|---|---|---|---|
| RPN | SPD | COH | RPN | SPD | COH | |
| VV | 925 008 | 6.2e+07 | 0. 289 | 872 105 | 6.5e+07 | 0. 322 |
| OPT | 822 700 (11.1%↓) | 5.9e+07 (4.9%↓) | 0. 322 (11.4%↑) | 754 483 (13.5%↓) | 6.1e+07 (6.2%↓) | 0. 371 (15.2%↑) |
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