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 |
