采用Loh近似假设的最优气动力辅助异面变轨研究

提出了一种Ｌｏｈ近似模型，并在此基础上导出了最优气动力辅助异面变轨的控制规律，以及相应的最优轨迹的近似解析解。给出了Ｌｏｈ近似模型中各系数的求解方法。通过对最优控制律及轨迹近似解的分析，得到一些有益的结论。

OPTIMAL AEROASSISTED GUIDANCE USING LOH'S TERM APPROXIMATIONS

A new Loh's model is deduced. The Loh's term may be modeled as an inverse proportion function of δ, which is t he lift coefficients ill vertical plane at a maximum lift-to-drag ratio. Based on t he Loh's model, the paper deduced the optimal control law and reentry trajectory of aeroassisted noncoplanar orbit transfer,where the exit speed is maximized and the exit altitude, flight-path angle, heading angle are fixed. By analysing the optimal control law and reentry trajectory, some important conclusions are obtained.