亚轨道飞行器返回轨道设计方法研究

An Alternative Method of Entry Trajectory Design for Suborbital Launch Vehicle

返回轨道的设计对于亚轨道飞行器安全返回地面起着十分重要的作用。依据气动力作用的显著性,将返回下降轨道分为初始下降段和过渡段,初始下降段采用定倾斜角的飞行方法,过渡段中,采用四次多项式建立标准高度-速度剖面,通过将各种约束表示在高度速度空间中,得到轨道设计约束边界,在满足这些约束边界的前提下,得到标准高度-速度剖面的多项式系数,最后,通过对航程的调制,得到最终的标准轨道。

Design of entry trajectory is primary for SLV's(Suborbital Launch Vehicle) return to the landing site in safety.Entry trajectory was divided into initial descent phase and transition phase according to the prominence of aerodynamics forces.At the initial descent phase,constant bank angle was employed.At the transition phase,desired height vs.velocity profile was built by a 4th order polynomial,and constraint boundaries were derived through denoting constraints to height vs.velocity space.Coefficients of the...