TLDR
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Sentinel-1D completes commissioning, bringing the Copernicus SAR constellation to four operational satellites for the first time.
Key Takeaways
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The four-satellite constellation provides all-weather, 24/7 synthetic aperture radar coverage; Sentinel-1B was lost in 2022 after a technical anomaly.
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A 20-year unbroken radar observation record is now on track, enabling climate model validation and long-term environmental change detection.
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Sentinel-1C and 1D introduce a new debris-reduction separation mechanism, an engineering first for the series.
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ESA is already developing Sentinel-1 Next Generation to maintain continuity into the mid-2030s with enhanced capabilities.
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Data supports disaster response, sea ice monitoring, land deformation, deforestation, and flood mapping at global scale.
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