HIRS/4 performance

Optical FOV 1.4° for VIS and SWIR
1.3° for TIR
Telescope aperture 15 cm diameter
Channel to channel registration TIR: <1.5% of 1.8° step size
SWIR: <1% of cha. 19 FWHM
Earth scan angle, scan steps ± 49° from nadir, 56 increments of 1.8°
Stop and stare time 100 ms total
Total scan plus retrace time 6.4 s
Swath width 2160 km
Spatial resolution 20.3 km (1.4° FOV) at nadir
18.9 km (1.3° FOV) at nadir
Data quantization 13 bit
Data rate 8320 bps
Mass < 33.6 kg
Power Av. <25 W
Cooler 2 stage cooler controlled at 95K (-178°C)
Scan motor A stepper motor with 200 steps per rotation

Glossary HIRS/4 performance table:

FOV : Field of view
VIS : Visible
SWIR : Short wavelength infrared
TIR : Thermal infrared
FWHM : Full Width Halve Maximum

Last update: 28 June 2006

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