Channels

AMSU is actually composed of two instruments: AMSU-A, with 15 channels, and AMSU-B, with 5. The following table compares the channelization of AMSU with other microwave instruments.

Microwave Frequencies (GHz) and Polarizations
ChannelSSM/TMSUAMSU-AAMSU-BSSM/ISSM/T-2
150.5H50.30R23.8R89.0R19.35H183.33R
253.2H53.74R31.4R150.0R19.35V183.31R
354.35H54.96R50.3R183.31R22.235V183.37R
454.9H57.95R52.8R183.33R37.0H91.7R
558.4V53.6R183.37R37.0V150R
658.825V54.4R85.5H
759.4V54.9R85.5V
855.5R
957.2R
1057.29.217R
1157.29.322.048R
1257.29.322.022R
1357.29.322.010R
1457.29.322.0045R
1589.0R

Notation: xyz; x is the center frequency. If y appears, the center frequency is not sensed, but two bands, one on either side of the center frequency, are sensed; y is the distance from the center frequency to the center of the two pass bands. If z appears, it is the width of the two pass bands. This pattern is easily implemented with radio frequency receivers, and it effectively doubles the signal (two pass bands instead of one).

Polarization: V = vertical, H = horizontal, R = rotates with scan angle.

Source: Kidder and Vonder Haar (1995)


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