Atmospheric propagation tests in support of electrooptics system development frequently require measurement of the atmospheric transmission at discrete frequencies or the average transmission for a finite spectral bandwidth. The conditions of the test may require that measurements be made over horizontal or slant paths, or even that a moving source be tracked. In many tests it is also necessary to acquire slant path atmospheric turbulence data. A measure of the transverse coherence length (r_o), isoplanatic angle (θ_o), and/or turbulence structure constant (C_n²) profile may be required. To address these needs, an extremely versatile mobile atmospheric profiling system (MAPS) has been designed and fabricated. Field tests are now being conducted and a variety of data have been collected. The MAPS, using a Fourier transform spectrometer, turbulence profile sensors, and an 0.8-m Coude telescope is described and examples of recent data are presented.

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