ESTIMATES OF ATTENUATION AND REFLECTION OF TELEMETERING SIGNALS BY IONIZED FLOW FIELDS SURROUNDING TYPICAL REENTRY BODIES

摘要

Estimates of the degree of signal loss due to attenuation and reflection by the inviscid equilibrium plasma sheath were made for spherically blunted cones with half-angles of 30°, 9°, and 0° at Mach numbers as high as 25, 20, and 19-25, respectively. The computations were made for transmitting frequencies of 50 mc, 240 mc, and 10,000 mc and over the altitude range from 60,430 feet to 250,000 feet. Calculations, utilizing the simplest application of electromag¬netic theory, were made by using normalized body shape parameters, and methods for applying the resulting tabulated data to specific vehicle reentry problems are discussed.nThe possible significance of viscous interaction and nonequilibrium effects on the applicability of the results to a given problem is discussed briefly.