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Surface Water and Ocean Topography - SWOT
SCIENCE
Amazon River
Amazon River
Instrument
The Ka-band Radar Interferometer (KaRIN) instrument makes this mission possible. KaRIN contains two Ka-band SAR antennae at opposite ends of a 10-meter boom with both antennae transmitting and receiving the emitted radar pulses along both sides of the orbital track. Look angles are limited to less than 4.5° providing a 120-km wide swath. The 200-MHz bandwidth achieves cross-track ground resolutions varying from about 10 m in the far swath to about 60 m in the near swath. A resolution of about 2 meters in the along track direction is derived by means of synthetic aperture processing.
With its wide swath, SWOT will cover all Earth's lakes, rivers, reservoirs and oceans at least twice every 21 days.


Altimeter System
Orbit HeightOrbit TypeSwathFrequencyHeight PrecisionSpatial ResolutionInstrument
SWOT857-890 km22-day repeat
78 Deg Inclination
120 kmKa-band~1 cm @ 1 km resolution<100 m imagingInterferometer
OSTM/Jason-21336 km10-day repeat
66 Deg Inclination
NAKu-band2 cm6.2 km along-track; 300 km cross-trackNadir Altimeter


Ka-Band Radar Interferometer


SWOT KaRIN instrument draft
Artists concept of SWOT KaRIN instrument.
Both the surface water hydrology and ocean surface topography communities recognize the importance of wide-swath altimetry for its capability of acquiring high-resolution elevation measurements. The technology for WATER and HM is a Ka-band Radar INterferometer (KaRIN, 0.86 cm wavelength) that has been developed from the efforts of the Wide Swath Ocean Altimeter (WSOA; Fu, 2003; Fu and Rodriguez, 2004). KaRIN is essentially a smaller version of SRTM with two Ka-band SAR antennae at opposite ends of a 10 m boom and both antennae transmitting and receiving the emitted radar pulses along both sides of the orbital track. Look angles are limited to 4.5° providing a 120 km wide swath. The 200 MHz bandwidth achieves cross-track ground resolutions varying from about 10 m in the far swath to about 60 m in the near swath. A resolution of about 2 m in the along track direction is derived by means of synthetic aperture processing.

Below are various technology presentations in Power Point format that relate to the SWOT mission.



Year: 2006
  • Vivien Enjolras, "Altimetry Waveform Data and SRTM to Retrieve River Characteristics." Venice 2006. (Link)

  • Vivien Enjolras, "Performance Study of Interferometric Radar Altimeters." Venice 2006. (Link)

  • Vivien Enjolras, "The WatER Mission in Europe: How Can It Help Science?." Venice 2006. (Link)


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