An application-specific uniform calibration source is described. The biggest challenge in developing the system
is to achieve 25% higher spectral radiance values than the Earth's spectral radiance, with the lowest
wavelength being the hardest to meet. This pre-flight test equipment will be used for characterization and
calibration of imaging radiometers which will be used as
satellite-borne remote sensors for KOPMSAT-3. The
integrating sphere-based system will be used as a spectral radiance standard.
Included are the end user's requirements in regards to spectral radiance levels, radiance stability, radiance
uniformity and spectral radiance monitoring. Detailed design challenges, approach and modeling information is
discussed.
The Multi-Spectral Camera (MCS) is the electro-optical imaging isntrument for high-resolution observation of the Earth with push broom scanning in the space. The MSC uses compact and light weighted optical design to tkae image with high MTF (modulation transfer function) performance. The Ritchey-Chretien with focal correct lens is selected to implement enough performance in the wide swath width. The focal plane has one panchromatic (PAN) and four multi-spectral (MS) CCD (charge coupled device) for the imaging of visible and near-infrared wavelength. The PAN and MS have their own focus correct lens to correct field aberration and also to make proper effective focal length. Here we present the optical design and analysis of the MSC.
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