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The MODIS instrument has been designed
and developed since the Engineering Model (EM) was completed
in mid-1995. Since then, two spaceflight units, the Protoflight
Model (PFM) (aboard the Terra Satellite) , and the Flight
Model 1 (FM1) (aboard the Aqua Satellite) have been completed
and launched. Terra was launched on December 18, 1999, and
Aqua was launched on May 4, 2002. The MODIS instruments —
built to NASA specifications by Santa Barbara Remote Sensing
— represent the finest in engineering of spaceflight
hardware for remote sensing.
The MODIS instruments were designed with
the following subsystems and abilities. Follow the highlighted
links for more technical descriptions of each subsystem.
- Atmospheric, land, and ocean imaging in a single instrument
- 1,000-m, 500-m, and 250-m resolution spectral bands
- Custom-tailored spectral bands from 0.4 to 14.4 µm;
low out-of-band response
- Opto-Mechanical
System
- Mainframe
- Continuously rotating double-sided Scan
Mirror Assembly for long life
-
Passive Radiative Cooler
- Advanced
Focal Plane Assembly (FPA) technology for unsurpassed
sensitivity
- Optical
Bench Assembly
- Optical
System Description
- Door Assemblies
- Electronics
System
- Space-Viewing
Analog Module
- Forward-Viewing
Analog Module
- Main
Electronics Module (MEM)
- On-Board
Calibration System
- IR calibration every scan for low 1/f noise and high accuracy
- Low ghosting, low scatter optics
- On-board
Solar Diffuser and
Solar Diffuser Stability Monitor (SDSM)
- On-board full-aperture Blackbody
(BB)
- On-board
Spectroradiometric Calibration Assembly (SRCA)
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