A Partial Reconstruction Method for SAR Altimeter Coastal Waveforms Based on Adaptive Threshold Judgment
Abstract
:1. Introduction
2. Materials and Methods
2.1. Coastal Waveform Data of the Sentinel-3 SAR Altimeter
2.2. Echo Model Fitting and Matching Error Calculation
2.3. Adaptive Threshold Judgment Based on Error Distribution
2.4. Waveform Reconstruction and Retracking Method
3. Results
3.1. MQE Comparison and Retracking Results for Area 1
3.2. SSH Retrieval Results and Precision Validation of Area 2
4. Conclusions
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Item | Area 1 | Area 2 |
---|---|---|
Measure Satellite | Sentinel-3B | |
Measure Mode | SAR | |
Measure Year | 2022 | |
Measure Pass | 309 | 123 |
Measure Month | 3, 4, 6, 7, 9 | a whole year |
Data Rate | 20 Hz | |
Data Level | L2 GDR |
No. Month | 1 | 2 | 3 | 4 | 5 | |
---|---|---|---|---|---|---|
MQE improvement proportion | 91.86% | 84.44% | 84.88% | 78.49% | 91.86% | |
Retracking success rate | Without Reconstruction | 37.21% | 42.22% | 51.16% | 40.86% | 38.37% |
With Reconstruction | 90.70% | 73.33% | 76.58% | 79.57% | 87.21% | |
Increasing Percentage | 53.49% | 31.11% | 25.42% | 38.71% | 48.84% |
No. Pass | MQE Improvement Proportion | Retracking Success Rate | ||
---|---|---|---|---|
without Reconstruction | with Reconstruction | Increasing Percentage | ||
1 | 68.13% | 21.98% | 53.85% | 31.87% |
2 | 93.94 % | 42.42% | 97.98% | 55.56% |
3 | 63.64% | 49.09% | 61.82% | 12.73% |
4 | 92.06% | 65.08% | 93.65% | 28.57% |
5 | 59.14% | 65.59% | 69.89% | 4.30% |
6 | 83.00% | 54.00% | 91.00% | 37.00% |
7 | 63.00% | 86.00% | 88.00% | 2.00% |
8 | 79.59% | 58.16% | 96.94% | 38.78% |
9 | 88.33% | 61.67% | 86.67% | 25.00% |
10 | 91.23% | 42.11% | 87.72% | 45.61% |
11 | 84.09% | 57.95% | 94.32% | 36.37% |
12 | 82.83 % | 58.59% | 92.93% | 34.34% |
13 | 94.95% | 47.47% | 97.98% | 50.51% |
Mean | 80.30% | 54.62% | 85.60% | 30.98% |
Method | OCOG | NPPTR | without Reconstruction | with Reconstruction |
---|---|---|---|---|
Noise level | 26.23 cm | 27.53 cm | 12.75 cm | 6.32 cm |
RMSE | 59.87 cm | 39.82 cm | 15.24 cm | 7.06 cm |
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Liu, X.; Kong, W.; Sun, H.; Lu, Y. A Partial Reconstruction Method for SAR Altimeter Coastal Waveforms Based on Adaptive Threshold Judgment. Remote Sens. 2023, 15, 1717. https://doi.org/10.3390/rs15061717
Liu X, Kong W, Sun H, Lu Y. A Partial Reconstruction Method for SAR Altimeter Coastal Waveforms Based on Adaptive Threshold Judgment. Remote Sensing. 2023; 15(6):1717. https://doi.org/10.3390/rs15061717
Chicago/Turabian StyleLiu, Xiaonan, Weiya Kong, Hanwei Sun, and Yaobing Lu. 2023. "A Partial Reconstruction Method for SAR Altimeter Coastal Waveforms Based on Adaptive Threshold Judgment" Remote Sensing 15, no. 6: 1717. https://doi.org/10.3390/rs15061717