Problem 7: Use of the SPS system for remote sensing of winds, turbulence, and refractivity perturbations as a means of development of feedback signals to help control and system performance, and accommodate safety-related decision actions. Problem 8: Wavelength considerations. By and large, the panel believed that while it may be desirable to move to higher frequencies to reduce antenna sizes and interference effects, the increased effects of attenuation and depolarization (among others) seem to preclude going to considerably higher frequencies. The meteorological studies should indicate the wavelength sensitivities of the cited absorption, scattering, and refractive effects.
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