From Event: SPIE Optical Engineering + Applications, 2017
We evaluate the piston-removed anisoplanatic error for smaller apertures imaging over long horizontal paths. Previous works have shown that the piston and tilt compensated anisoplanatic error saturates to values less than one squared radian. Under these conditions the definition of the isoplanatic angle is unclear. These works focused on nadir pointing telescope systems with aperture sizes between five meters and one half meter. We directly extend this work to horizontal imaging scenarios with aperture sizes smaller than one half meter. We assume turbulence is constant along the imaging path and that the ratio of the aperture size to the atmospheric coherence length is on the order of unity.
Jeffrey Beck and Jeremy P. Bos, "Saturation of the anisoplanatic error in horizontal imaging scenarios," Proc. SPIE 10408, Laser Communication and Propagation through the Atmosphere and Oceans VI, 104080X (Presented at SPIE Optical Engineering + Applications: August 09, 2017; Published: 7 September 2017); https://doi.org/10.1117/12.2273408.
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