Conditions for sustained resonance. II

A generalized form of Kerkorian's (1974, 1978) model of sustained reentry roll resonance, which occurs when a slightly asymmetric ballistic spacecraft reenters the earth's atmosphere, is examined using a method proposed by Haberman (1983). This method determines the width of the energy band in which solutions are entrained into sustained resonance, thereby enabling a sufficient condition for entrainment to and continuation of sustained resonance to be given. Both the width of the energy band and the sufficient condition are calculated in terms of the slowly varying pitching and yawing frequency, which is assumed to be known.