航天飞机末端区域能量管理段航程设计研究

末端区域能量管理段的主要目的是控制航天飞机的动能和势能，并最终达到进场着陆段的初始要求，以保证最终成功着陆。制导系统通过能量、速度和侧向轨迹的控制，使航天飞机达到标准的能量状态。而航程设计是制导系统的基础，制导系统中控制指令的产生都依赖于航程预测，因此，设计预测航程对航天飞机顺利完成末区能量管理段的飞行至关重要。所采用的制导方法是将末端区域能量管理段划分为四个飞行段，即S形转弯段、捕获段、航向校准段及进场前飞行段。分别对四段进行了预测航程设计，并给出了仿真实例。仿真结果表明所设计的航程能够使航天飞机很好地完成末区能量管理段的飞行，具有较高的工程实现价值。

Predicted Trajectory Design for Space Shuttle Terminal Area Energy Management Phase

Terminal Area Energy Management(TAEM) phase is a phase of space shuttle reentry.The purpose of this phase is to control the kinetic energy and potential energy state of the vehicle and enable the vehicle to achieve the proper conditions of the approach and landing phase for a successful landing.The guidance controls the vehicle through adjustment of the height,speed and flight track of the vehicle to get preference energy.The predicted trajectory design is the base of the guidance system,all control command produced by the guidance system depend on the predicted trajectory.So it is very important to space shuttle in order to accomplish the flight through TAEM successfully.TAEM is further divided into four distinct sub phases.These sub phases,in order of occurrence, are Sturn,Acquisition,Heading alignment,and Prefinal Approach.This paper studies further on predicted trajectory design for space shuttle(TAEM) phase,and makes simulation verification.The simulation result indicates that the predicted trajectory designed in this paper is approved to be satisfactory.