Dr. John Stryjewski (CSC-ISTEF), Dan Hand (CSC-ISTEF), Dr. David Tyler (University of Arizona), Sukumar Murali (University of Arizona), Dr. Mike Roggemann (Michigan Technological University), Nick Peterson (Michigan Technological University)
Keywords: Non-Resolved Object Characterization
Abstract:
Determining the shape, material and orientation of nano-sats (satellites too small to image from the ground) requires new sensing approaches. Pulse Polarization Ranging (PPR) is one such approach that uses the polarization and shape characteristics of laser pulses reflected from satellites to determine satellite shape, orientation and material. We use an innovative approach to relate PPR measurements to actual satellite characteristics (shape, material and orientation), requiring that we have an accurate physical and dynamical model of the satellite. In particular, to determine the polarization characteristics (depolarization, birefringence, diattenuation) of the reflected pulses we need an accurate model of light scattering from real (complex) surfaces. To do this, we have extended the micro-facet model of Ashikhmin et al. to include retro-reflection and multiple scattering effects. In this presentation, we describe the scattering model and its efficient implementation using graphical processing units (GPUs).
Date of Conference: September 1-4. 2009
Track: Non-Resolved Object Characterization