 | | | | |
| | | | | |
|
MetOp at a glance OverviewWhy we need MetOpFacts & figuresHistory Satellite Instruments Launch Mission operations The team Resources Multimedia MetOp imagesMetOp videosMetOp animationsHelpServices CalendarSubscribe
| | | | | | | AMSU-A1 channels
The Advanced Microwave Sounding Unit (AMSU-A1) consists of twelve V-band channels (3 - 14) and one W-band channel 15 and associated circuitry. It has two scanning reflectors: the lower antenna (farthest from Earth in flight) is designated A1-1 and provides inputs to channels 6 and 7, and channels 9 - 15; the upper antenna (closest to Earth in flight) designated A1-2 provides input to channels 3 - 5 and 8.
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-A1 radiometer characteristics are illustrated in the table below:
| | Centre frequency (MHz) | Bandwidth (MHz) | Centre frequency stability (MHz) | | 3 | 50300 | 180
(2 pass-bands) | ± 10.0 | | 4 | 52800 | 400
(2 pass-bands) | ± 5.0 | | 5 | 53596 ± 115 | 170
(2 pass-bands) | ± 5.0 | | 6 | 54400 | 400
(2 pass-bands) | ± 5.0 | | 7 | 54940 | 400
(2 pass-bands) | ± 5.0 | | 8 | 55500 | 330
(2 pass-bands) | ± 10.0 | | 9 | 57290.344 = Flo | 330
(2 pass-bands) | ± 0.5 | | 10 | Flo ± 217 MHz | 78
(2 pass-bands) | ± 0.5 | | 11 | Flo ± 322.2 MHz ± 48 MHz | 36
(4 pass-bands) | ± 1.2 | | 12 | Flo ± 322.2 MHz ± 22 MHz | 16
(4 pass-bands) | ± 1.2 | | 13 | Flo ± 322.2 MHz ± 10 MHz | 8
(4 pass-bands) | ± 0.5 | | 14 | Flo ± 322.2 MHz ± 4.5 MHz | 3
(4 pass-bands) | ± 0.5 | | 15 | 89.0 GHz | 3000
(2 pass-bands) | ± 130.0 |
|
| | Temperature sensitivity
NEDT (K) | Calibration Accuracy (K) | Polarization | -3 dB Stop Band (SB) fc ± SB (MHz) | | 3 | 0.4 | 1.5 | V | 10.0 | | 4 | 0.25 | 1.5 | V | 10.0 | | 5 | 0.25 | 1.5 | H | 30.0 | | 6 | 0.25 | 1.5 | H | 10.0 | | 7 | 0.25 | 1.5 | V | 10.0 | | 8 | 0.25 | 1.5 | H | 10.0 | | 9 | 0.25 | 1.5 | H | 10.0 | | 10 | 0.4 | 1.5 | H | 178.0 | | 11 | 0.4 | 1.5 | H | 256.2 | | 12 | 0.6 | 1.5 | H | 292.2 | | 13 | 0.8 | 1.5 | H | 308.2 | | 14 | 1.2 | 1.5 | H | 316.2 | | 15 | 0.5 | 2.0 | V | 500.0 |
|
V : Polarization vector is parallel to scan plane at nadir
H : Polarization vector is perpendicular to scan plane at nadir
Last update: 28 June 2006 | |
| | In depth About AMSU-A1ComponentsProductsMetOp's instruments A/DCSAMSU-A1AMSU-A2ASCATAVHRRGOME-2GRASHIRSIASIMHSSARP-3SARRSEM
|
