AMSU-A2 channels

The Advanced Microwave Sounding Unit (AMSU-A2) consists of the lowest frequencies of the AMSU-A system (K band channel 1 and Ka band channel 2), and the associated scanning, calibration, processing, and power control hardware and circuitry.

At each channel frequency, the antenna beamwidth is a constant 3.33° ± 10% (circular, at half power point). Thirty contiguous resolution scenes are sampled in a stepped-scan fashion every eight seconds.

AMSU-A2 radiometer characteristics are illustrated in the table below:

  Centre frequency  (MHz) Bandwidth (MHz) Centre frequency stability (MHz)
1 23800
(2 pass-band)
270 ± 10.0
2 31400
(2 pass-band)
180 ± 10.0

  Temperature sensitivity
NEDT (K)
Calibration Accuracy (K) Polarization -3 dB Stop Band (SB) fc ±  SB (MHz)
1 0.3 2.0 V 10.0
2 0.3 2.0 V 10.0

V : Polarization vector is parallel to scan plane at nadir

Last update: 28 June 2006

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