- Title
- A new retracking technique for Brown Peaky altimetric waveforms
- Creator
- Peng, Fukai; Deng, Xiaoli
- Relation
- ARC.DP150100615 http://purl.org/au-research/grants/arc/DP150100615
- Relation
- Marine Geodesy Vol. 41, Issue 2, p. 99-125
- Publisher Link
- http://dx.doi.org/10.1080/01490419.2017.1381656
- Publisher
- Taylor & Francis
- Resource Type
- journal article
- Date
- 2018
- Description
- A new Brown-Peaky (BP) retracker has been developed for peaky waveforms that usually appear within ∼10 km to the coastline. The main feature of the BP is that it fits peaky waveforms using the Brown model without introducing a peak function. The retracking strategy first detects the peak location and width of a waveform using an adaptive peak detection method, and then estimates retracking parameters using a weighted least squares (WLS) estimator. The WLS assigns a downsized weight to corrupted waveform gates, but an equal weight to other normal waveform gates. The BP retracker has been applied to 4-year Jason-1 waveform (2002–2006) in two Australian coastal zones. The results retracked by BP, MLE4 and ALES retrackers have been validated against tide-gauge observations located at Burnie, Lorne and Broome. The comparison results show that three retrackers have similar performance over open oceans with the correlation coefficient (∼0.7) and RMSE (∼13 cm) between altimetric and tide-gauge sea levels for distance >7 km offshore. The main improvement of BP retracker occurs for distance ≤7 km to the coastline, where validation results indicate that data retracked by BP are more accurate (15–21 cm) than those by ALES (16–24 cm) and MLE4 (19–37 cm).
- Subject
- Brown-peaky waveform; coastal satellite altimetry; peak detection; sea level anomaly; tide gauge; weighed least squares estimator; validation
- Identifier
- http://hdl.handle.net/1959.13/1413028
- Identifier
- uon:36568
- Identifier
- ISSN:0149-0419
- Language
- eng
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