Abstract
In Part I [1] , a Korsch-based optical telescope design of a very high resolution earth observation satellite with a ground sampling distance of 25 cm is presented. In this part II, a system performance evaluation of the Korsch optical design employing a time-delay and integration charge-coupled device is investigated. Several key performance metrics are assessed, including the system modulation transfer function (MTF), absolute signal-to-noise ratio (SNR), differential SNR, noise equivalent change of reflectance, and cutoff resolution. The level of the national imagery interpretability rating scales (NIIRS) for measuring the image quality is also predicted. The system MTF has been computed, involving optics, detector, platform, orbit, atmosphere, and target illumination conditions. The SNR has been analyzed at different target albedos, solar, and satellite zenith angles. A new strategy for expressing the system evaluation based on the low- and high-illumination conditions is adopted; providing the operational ranges of such metrics. The assessment shows that for the high- and low-illumination conditions, the predictable performance of the proposed telescope gives promising results and provides an acceptable image quality.
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