Abstract
Twomethods to infer freestream densities from in-flightmeasurements of pitot pressure and flight velocity during reentry are presented that focus on the minimization of uncertainties due to high-temperature real-gas effects and atmospheric densityfluctuation. A numerical approach leads to a curve-fit function that yields the ratio of the pitot to the dynamic pressure pt2=q1 for velocities between 0.5 and 10 km=s and altitudes up to 90 km. An analytically derived correlation is also provided. Both techniques account for equilibrium real-gas effects thus achieving very high accuracies. Independently of potential atmospheric fluctuation, remaining errors are less than 1% for almost the entire spectrum and less than 0.3% for typical lifting reentry.
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