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中文摘要：
针对考虑交接班误差的重复使用运载器（RLV）无动力自动进场着陆段轨迹设计问题进行了研究.将整个自动进场着陆过程分成交接段、标称下滑段和标称拉平段3个阶段.在依据标称交接班状态、触地状态逆序完成拉平段、下滑段的标称轨迹设计的前提下,针对可能存在的交接班误差,提出一种综合考虑纵、侧向位置和速度交接班误差的交接段在线三维轨迹设计方法,并结合阻力舵调整策略,实现RLV从交接班点向标称轨迹的平滑过渡;然后,在交接段轨迹设计基础上提出了交接高度平面内“安全交接区域（SIA）”的概念及其求解方法.仿真结果表明：所提出的轨迹设计方法及SIA对存在交接班误差的无动力进场着陆轨迹设计问题具有实际的参考意义.
英文摘要：
The trajectory planning for reusable launch vehicle （RLV） approach and landing with initial interface error is researched.The automatic approach and landing trajectory is divided into three sections：interface section,nominal glideslope section and nominal flare section.The last two sections are designed firstly,based on the nominal interface states and the desire touch down states.Then,an online three dimensional trajectory generation method for interface section by which the vertical,horizontal and velocity errors are concerned simultaneously is raised,together with a piecewise linear speed brake adjustment strategy.According to the Interface trajectory,the concept of ＂safe interface area （SIA）＂ in the Interface height plane is proposed and the method is also included.Finally,the simulations show the reference value of the SIA and trajectory generation method for the trajectory planning of unpowered vehicle approach and landing with initial interface errors.
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