T2SL (Type II Super Lattice) has become one of the most important material for infrared detector. It has now widely used for HOT MWIR detector and large format LWIR detector. The HOT detector is especially important for satellite application because HOT detector occupies small volume and requires small power. In this work, the radiation test results of MWIR T2SL nbn detector will be presented. The developed hybrid chip has the format of 2048 x 2048 pixels with 10 μm pitch. It was fabricated with Ga-free InAs/InAsSb absorber layer and GaAsSb barrier layer. The quantum efficiency of the developed hybrid chip is larger than 50% and the dark current is below 2 x 10-8 A/cm2. To be used in the space environment condition, the TID (Total Ionizing Dose) effects and DD (Displace Damage) effects were tested and test results are presented.
The Geostationary Ocean Color Imager II (GOCI-II) is the next generation of GOCI, which is one of the main payloads of the Korean COMS satellite. GOCI was the first ocean color sensor in the world operating on the geostationary orbit.
The Compact Airborne Imaging Spectrometer System (CAISS) was designed and developed as the airborne
hyperspectral imaging system. The mission of the CAISS is to provide full contiguous spectral information with high
spatial resolution for advanced applications in the field of remote sensing. The CAISS has an ability to control the
spectral and spatial configuration of the imaging instruments. In order to understand the mechanism of imaging
spectrometer system and its characteristics, the several verification tests with the CAISS were conducted in the
laboratory. Especially, the verification of camera system was performed with the integrating sphere and spectral lamps.
In order to verify the spectral characteristics, four spectral binning (x1, x2, x4, and x8) were measured using each of the
spectral lamps and the position of the peaks was compared to the reference data sheet of each spectral lamps. For all
measurements, it was found that the spectral deviation was lower than the Full Width Half Maximum (FWHM) of the
system for each of the spectral binning. Also several interface verification tests between the CAISS and the airplane were
conducted on the ground. This paper presents the preliminary results of verification test in the camera system level and
interface test with airplane on the ground.
Multi-Spectral Camera(MSC) is a payload on the KOMPSAT-2 satellite to perform the earth remote sensing. The
instrument images the earth using a push-broom motion with a swath width of 15 km and a ground sample distance
(GSD) of 1 m over the entire field of view (FOV) at altitude 685 Km. The instrument is designed to have an on-orbit
operation duty cycle of 20% over the mission lifetime of 3 years with the functions of programmable gain/ offset and
on-board image data compression/storage.
KOMPSAT-2 was launched on July 28 2006 and stared early operation including Initial Activation and Checkout(IAC).
During IAC phase, MSC was checked and tested by prepared procedure.
In this paper, the preparation, the sequence and the procedure of MSC initial activation checkout including SOH (State
Of Health) are described. The activities including the checkout results during IAC as parts of Launch & Early Operation
Period (LEOP) are discussed and analyzed.
Multi-Spectral Camera(MSC) is a main payload on the KOMPSAT-2 satellite to perform the earth remote sensing. The
MSC instrument has one(1) channel for panchromatic imaging and four(4) channel for multi-spectral imaging covering
the spectral range from 450nm to 900nm using TDI CCD Focal Plane Array (FPA).
The instrument images the earth using a push-broom motion with a swath width of 15 km and a ground sample distance
(GSD) of 1 m over the entire field of view (FOV) at altitude 685 Km. The instrument is designed to have an on-orbit
operation duty cycle of 20% over the mission lifetime of 3 years with the functions of programmable gain/ offset and
on-board image data compression/ storage.
The compression method on KOMPSAT-2 MSC was selected and used to match EOS input rate and PDTS output data
rate on MSC image data chain. At once the MSC performance was carefully handled to minimize any degradation so
that it was analyzed and restored in KGS(KOMPSAT Ground Station) during LEOP and Cal./Val.(Calibration and
Validation) phase.
In this paper, on-orbit image data chain in MSC and image data processing on KGS including general MSC description
is briefly described. The influences on image performance between on-board compression algorithms and between
performance restoration methods in ground station are analyzed, and the relation between both methods is to be
analyzed and discussed.
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