22 July 2008 Simulations of sample-up-the-ramp for space-based observations of faint sources
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Abstract
We have conducted simulations of a memory-efficient up-the-ramp sampling algorithm for infrared detector arrays. Our simulations use realistic sky models of galaxy brightness, shapes, and distributions, and include the contributions of zodiacal light and cosmic rays. A simulated readout is based on the HAWAII-2RG arrays, and includes read noise, dark current, KTC noise, reset anomaly, persistence, and random telegraph noise. The up-the-ramp algorithm rejects cosmic rays, RTN, and KTC noise. The reset anomaly and persistence are also correctable. It produces a best estimate of the source flux under the assumption of very low signal-to-noise, while the overall dynamic range is increased. We present an analysis of the fidelity of image brightness recovery with this algorithm. This work is motivated by the need for sensitive, precise, accurate photometry for Destiny, a mission concept under study for the Joint Dark Energy Mission (JDEM).
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Dominic J. Benford, Dominic J. Benford, Tod R. Lauer, Tod R. Lauer, D. Brent Mott, D. Brent Mott, } "Simulations of sample-up-the-ramp for space-based observations of faint sources", Proc. SPIE 7021, High Energy, Optical, and Infrared Detectors for Astronomy III, 70211V (22 July 2008); doi: 10.1117/12.789976; https://doi.org/10.1117/12.789976
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