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Microwave Science Header - Artist Concept of a MWSCI Instrument Scanning the Earth's Surface
Specs / Technology
GeoSTAR Technology
Receiver array & resulting UV samples. The bottom left image of the globe is an example of AMSU-A, Channel 1.

GeoSTAR was constructed to act as a "Geostationary AMSU." Below is information about the instrument itself. Also available is the GeoSTAR development timeline (PDF, 5.22 MB).

Aperture-synthesis concept
  • Sparse array employed to synthesize large aperture
  • Cross-correlations ⇒ Fourier transform of Tb field
  • Inverse Fourier transform on ground ⇒ Tb field

Array
  • Optimal Y-configuration: 3 sticks; N elements
  • Each element is one I/Q receiver, 3.5λ wide (2.1 cm @ 50 GHz; 6 mm @ 183 GHz)
  • Example: N = 100 ⇒ Pixel = 0.09° ⇒ 50 km at nadir (nominal)
  • One Y per band, interleaved

Other subsystems
  • A/D converter; Radiometric power measurements
  • Cross-correlator - massively parallel multipliers
  • On-board phase calibration
  • Controller: accumulator ⇒ low D/L bandwidth

System Development
GeoSTAR development is also proceeding through partnerships, such as with OmniSys of Sweden. For detailed information, be sure to read a recent report on correlator ASIC test results.

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