Laser weapon systems comprised of tiled subapertures are rapidly emerging in importance in the directed energy
community. Performance models of these laser weapon systems have been developed from numerical simulations of a
high fidelity wave-optics code called WaveTrain which is developed by MZA Associates. System characteristics such as
mutual coherence, differential jitter, and beam quality rms wavefront error are defined for a focused beam on the target.
Engagement scenarios are defined for various platform and target altitudes, speeds, headings, and slant ranges along with
the natural wind speed and heading. Inputs to the performance model include platform and target height and velocities,
Fried coherence length, Rytov number, isoplanatic angle, thermal blooming distortion number, Greenwood and Tyler
frequencies, and atmospheric transmission. The performance model fit is based on power-in-the-bucket (PIB) values
against the PIB from the simulation results for the vacuum diffraction-limited spot size as the bucket. The goal is to
develop robust performance models for aperture phase error, turbulence, and thermal blooming effects in tiled
subaperture systems.
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