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The time-domain analysis simulation for advanced tracking (TASAT) approaches to compensated imaging

The TASAT code is a complete end-to-end system simulation of tracking and pointing systems. In its ground-based laser (GBL) system configuration, the code will treat tracking and imaging systems that look through atmospheric turbulence at high fidelity. In particular, the effects of atmospheric turbulence, adaptive optics servo lag, anisoplanatism, and deformable mirror (DM) fitting error are treated with a novel time average point-spread function (PSF). Tracking and imaging sensors are treated as a sequence of physical effects, including allocation of the image energy to pixels with finite dead bands, sensor noise effects, and integrating sensor dwell with analog-to-digital conversion. We treat the physics of atmospheric turbulence and adaptive optics in some detail in this paper, and discuss results for variations in system bandwidth, actuator spacing, atmospheric coherence length, and anisoplanatism effects. The DM is treated as a spatial and temporal transfer function acting on Kolmogorov atmospheric turbulence. We develop the time average PSF using the residual atmospheric structure function. Finally, we use the convolution of the PSF with realistic satellite imagery to assess tracking and imaging performance.