COAT Measurements and Analysis
Final technical rept. 1 Jul 1974-1 Jul 1975
HUGHES RESEARCH LABS MALIBU CA
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Coherent optical adaptive techniques COAT have been studied by experiment, by analysis, and by computer simulation. The experiments have utilized a 21-channel, visible-wavelength, multidither COAT system, while the computer simulations have dealt with both multidither outgoing-wave and phase- conjugate return-wave systems. Thermal blooming and turbulence distortions and complex-target effects speckle-modulations have been studied. This report summarizes the status of the 21-channel DARPARADC, visible-wavelength, multidither COAT experimental model and associated hardware and its use in the experimental measurements on this contract. Experimental observations with the 21-channel COAT system show that blooming distortions occurring in the first 30 of the focused propagation path can be compensated, leading to roughly a factor of 1.5 increase in peak focused-beam irradiance. Computer simulation of phase-conjugate return-wave COAT systems has shown almost no blooming compensation. Experimental measurements of COAT operation with equal transmitter and receiver apertures and semidiffuse, extended-glint scotchlight surfaces have failed to produce any degradation in the system convergence level, even though significant spurious modulations within the dither band were observed in the COAT receiver.
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