NAST-I Development History • Developed by MIT Lincoln Laboratory in 18 months for NPOESS using a COTS BOMEM (now ABB) interferometer, detectors, and optics • Flown aboard NASA's high-altitude ER-2, Northrop Grumman Proteus aircraft, and NASA’s WB-57 • Produces high spatial and spectral resolution data suitable for synthesizing data products of candidate NPOESS sounders • NAST-I has achieved excellent performance logging over 850 operational hours to date
NAST-I Development History. Developed by MIT Lincoln Laboratory in 18 months for NPOESS using a COTS BOMEM (now ABB) interferometer, detectors, and optics Flown aboard NASA's high-altitude ER-2, Northrop Grumman Proteus aircraft, and NASA’s WB-57 - PowerPoint PPT Presentation
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NAST-I Development History• Developed by MIT Lincoln Laboratory in 18 months for
NPOESS using a COTS BOMEM (now ABB) interferometer, detectors, and optics
beamsplitter/compensator 1.9in clear aperture KBralignment technique dynamic based on HeNe laserOPD +/- 2.0cm (high resolution mode)OPD velocity 5.2cm/sec, RMS variation under 1%sweep time 0.77sec turnaround time 0.044sec
Input Optics
Detector Characteristics
Micheleson Interferometer
NAST-I Schematic
Background Radiance in NAST-I• NAST-I operates at room temperature (ground and flight)• Cold field stop and baffles within detector package significantly
reduce background radiation from surrounding structures• Some flux is modulated by the interferometer and detected
Optical Bench NAST Detector Assembly
NAST-I System Diagram
InputOptics
MichelesonInterferometer
AftOptics
Detectors andPreamplifiers
PCI bus
1.2Gbyte disk
133MHz Triton Pentium Single Board Computer
SCSI bus
A/D DSP CardAnti-aliasing
filter
IR Light spatial (cm-1) temporal f (sec-1)
electrical signal (V)
optical signal (photons)
flight computer
cm sec
NAST Layout In ER-2 SuperPod
Scanning InterferometerSounder4 – 16 m
Electronics, Control & Navigation
MIT/RLEMicrowave Sounder
NASA ER-2
NADIR 2.6km IFOV20km Altitude+/- 23km Ground Swath
• What could be better– LW detector performance– Data collection– Data quicklook analysis– Vibration isolation– BS/CS wedge– More metrology signals – Improved GPS