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Measuring Ocean Surface Currents with Wavemill Mission
- 1. IGARSS 2011 Vancouver 29 July 2011 Christopher Buck , Miguel Aguirre, Craig Donlon, Daniele Petrolati, Salvatore D’Addio ESA/ESTEC STEPS TOWARDS THE PREPARATION OF A WAVEMILL MISSION
- 4. 100 km Sub-Satellite Track Flight Direction 90 km Orbit Height ~550 km t o 280 km 3 km Wavemill Operation
- 5. 100 km Sub-Satellite Track Flight Direction 90 km Orbit Height ~550 km t o 280 km 3 km Wavemill Operation
- 6. 100 km Sub-Satellite Track Flight Direction 90 km Orbit Height ~550 km t o 280 km 3 km Wavemill Operation
- 7. 100 km Sub-Satellite Track Flight Direction 90 km Orbit Height ~550 km t o 280 km 3 km Wavemill Operation
- 8. 100 km Sub-Satellite Track Flight Direction 90 km Orbit Height ~550 km 280 km 3 km Wavemill Operation
- 9. 100 km Sub-Satellite Track Flight Direction 90 km Orbit Height ~550 km 280 km 3 km Wavemill Operation
- 10. 100 km Sub-Satellite Track Flight Direction 90 km Orbit Height ~550 km 280 km 3 km Wavemill Operation
- 11. 100 km Sub-Satellite Track Flight Direction 90 km Orbit Height ~550 km 280 km 3 km Wavemill Operation
- 12. 100 km Sub-Satellite Track Flight Direction 90 km Orbit Height ~550 km 280 km 3 km Wavemill Operation
- 13. 100 km Sub-Satellite Track Flight Direction 90 km Orbit Height ~550 km 280 km 3 km Wavemill Operation
- 14. 100 km Sub-Satellite Track Flight Direction 90 km Orbit Height ~550 km 280 km 3 km Wavemill Operation
- 15. 100 km Sub-Satellite Track Flight Direction 90 km Orbit Height ~550 km 280 km 3 km Wavemill Operation
- 21. Scientific Objectives Land Challenges 1 and 3 P 9. Improve and validate hydrological models through data assimilation and improve freshwater inflow into the ocean. Ocean Challenges 1 and 5 P 8. Improve and validate numerical ocean circulation model and data-based assessment and prediction of ocean circulation Land Challenges 1 and 3 S 7. Quantify and map river flows and river flow variability Cryosphere Challenges 1, 2 and 4 S 6. Quantify and map the size, velocity and the variability of icebergs Cryosphere Challenges 1, 2 and 4 P 5. Quantify and map the variability of sea ice, sea ice thickness and velocity Ocean Challenges 1, 2, 3, 4 and 5 P 4. Quantify and map ocean swell and waves at regional and global scales Ocean Challenge 1 P 3. Evaluate and reduce the uncertainty of (sub)-mesoscale ocean surface current variability measurements at regional and global scales Ocean Challenges 1, 2, 3, 4 and 5 P 2. Quantify and map (sub)-mesoscale sea surface height and its variability Ocean Challenges 1, 2, 3, 4 and 5 P 1. Quantify and map (sub)-mesoscale (<0.1 – 10 km) ocean surface current vectors and their variability ESA’s Living Planet Programme Challenges Addressed Primary or Secondary Objective Wavemill Scientific Objectives
- 26. Mission Requirements PoC Campaign Product Assessment Study Simulator Feasibility Study MRD System Study
- 29. Planning
- 31. Wavemill Thank you for your attention!
Notes de l'éditeur
- Wavemill will try to address these limitations. It is an interferometric SAR altimeter with a wide swath that uses the doppler shift of the signal. It operates in the Ku band and the antennas are configured such that there is a cross track and along track separation. The four antennas are 4.5 m long and 0.35 m wide and use an interleaved slotted waveguide technology. The beams can be electronically steered as well. The phase centres are 12.4 m apart in the along track direction. The image here shows the location of the antennas. The antennas will be sequentially pulse. So antenna 1 will transmit and receive while antenna 3 receives. Then antenna 2 and so on and so on. This produces co-time and co-location interferograms.
- So with the 4 squinted beams (the fore, aft and right, left) and 2 observations per beam (bi-static and mono static) a total of 8 interferograms are produced. The multiple observations in a single pass allow direct measurements of ocean surface motion in 2 dimensions and also the sea surface height. Independent self-calibration capabilities of interferometric baseline
- 4 squinted beams Fore and aft Right and left 2 observations per beam Bi-static Mono-static 8 channels in total Multiple geophysical observations Direct measurement in two dimensions of ocean surface motion Two independent observations (fore, aft) of sea surface height Scatterometric data Independent self-calibration capabilities of interferometric baseline