Abstract
The modulation of the early re-entry intensity of optical emissions and radar range by the angular motion of a rolling re-entry vehicle is examined. The theoretical spectra of the modulation in the frequency space canonical to the square root of the air density at the vehicle altitude are generated. Transforms of length sufficient to resolve roll-related features without masking by the variation of the pitch oscillation frequency with vehicle altitude are possible in this frequency domain. It is shown that modulation mechanisms that depend linearly and quadratically on vehicle angle of attack result in up to six frequency components in this space. This transform technique provides a means to determine altitude-dependent stability parameter and roll-rate altitude profiles from optical or radar re-entry data.
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