Modeling and Simulation of a Long-Wave Infrared Polarimetric Sensor for Space Object Detection and Characterization

Abstract

Long-Wave Infrared (LWIR, wavelength > 8 um) polarimetric measurements can be used to characterize space objects under certain conditions. Both visible and LWIR polarimetry have been demonstrated extensively in terrestrial applications for characterization and detection of objects of interest. Visible polarimetry has also been demonstrated for space object detection. A simulation of a camera and telescope for collection of LWIR polarimetric signatures of space objects has been assembled using three software packages: Systems Tool Kit (STK), MATLAB, and FRED. Characterization of space objects is generally possible across a wide range of target surface temperatures and emissivities, and at a sub-pixel level; characterization is reliable in a narrower range. This approach represents an initial step forward in optical systems for space situational awareness in that it offers a wider field of view than equivalently sized visible light collectors, and it can be used both day and night, regardless of target illumination.