HiRISE Requirements and Performance Characteristics | ||
Parameter | Performance | Comments |
Ground Sample Distance (GSD) | 30 cm/pixel | From 300 km altitude |
Telescope aperture | 0.5 m, f/24 | For resolution and SNR |
Spectral range |
400 to 600 nm 550 to 850 nm 800 to 1000 nm |
Blue-Green (BG) Red Near infra-red (NIR) |
SNR Blue-Green Red NIR |
Typically 100:1 Typically 200:1 Typically 100:1 |
Achieved with TDI, backside thinned CCDs,and 50 cm aperture |
Swath Red Width Blue-Green &NIR |
>6 km >1.2 km |
From 300 km altitude From 300 km altitude |
Swath length | >2x swath width | Along track |
Data precision | 14 bit A/D | 12 to 13 bit usable |
Data compression | Real-time 14 to 8 bit Up to 16 x 16 binning Lossless compression at SSR |
Look-up table Increases areal coverage ~2:1 |
Data storage | 28 Gbits | All channels |
Number of pixels across swath | 20,264 Red 4,048 Green and NIR |
From swath and pixel scale |
TDI line time | ≥76 μsec | To match ground track speed |
CCD read noise | < 50 electrions rms at 22° C | Achieve SNR at low signal levels |
FOV | 1.14° x 0.18° | |
IFOV | 1 x 1 μrad | Detector angular subtense |
Relative Radiometry | <1% pixel to pixel | Absolute 20% |