James A. Dawson (Dynetics, Inc.), Jason M. Gallaspy (Dynetics, Inc.), Charles T. Bankston (Dynetics, Inc.), David Scott Stanfield (Dynetics, Inc.)
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Abstract:
We describe an analytical approach for modeling space-based thermal imaging systems as would be used for viewing resident space objects (RSOs) such as debris. The approach addresses key parameters for staring IR focal-plane arrays such as dark current and residual spatial noise. Another critical consideration is the target signature which is specified using the radiant intensity corresponding to the spectral band of the imaging system. An empirical method for determining appropriate signature values is preferred due to the uncertainty of modeling the thermal properties of space objects. To address this, the analytical modeling is extended to address a ground-located thermal imaging system such as would be used for measuring the radiant intensity of the space object. Notional sensor parameters will be given based on a simplified operational concept to demonstrate the modeling method. The sensor parameters include optical parameters and features of the data processing system such as frame integration. Additional design parameters include optical characteristics such as aperture diameter, focal ratio, and temperature, camera characteristics such as integration time, dark current and spatial noise, and system characteristics such as pointing accuracy and platform stabilization.
Date of Conference: September 1-4. 2009
Track: