A string of incidents related to Soyuz has raised concerns. Problems during a landing in April 2008 resulted in a dangerously steep re-entry trajectory.
联盟号飞船发生的一系列事故也让人感到担心。2008年四月着陆期间发生的问题导致它出现重返地球时的险情。
The technology of hole trajectory primary sect ion is the key of drilling in re entry horizontal Wells.
侧钻水平井轨迹起始段工艺技术，是侧钻水平井钻井工艺的关键技术。
A new method based on multi-model prediction is proposed for the longitudinal guidance of re-entry vehicles with trajectory and control constraints.
在具有控制和轨迹约束的再入制导中，提出了一种新的基于多模型预测再入飞行器纵向制导方法。
The flight trim aerodynamic characteristics of re-entry modules were calculated from on board-recorded inertial-platform accelerations and attitudes and from reconstructed trajectory data.
返回舱飞行试验的配平气动特性可从舱内惯性平台的加速度和姿态记录数据以及轨道数据求出。
The initial cavity, ballistic trajectory and velocity attenuation of the sphere pellets are similar at different water-entry angles and initial velocities.
在一定的入水角与速度范围内，球形弹丸入水初期弹道的空泡特性、弹道轨迹以及速度衰减规律具有一定的相似性。
The emphasis is put on estimating the states and parameters only on the basis of the re-entry on-board measurement data in the absence of trajectory observation data.
重点解决在没有轨道观测数据的情况下，如何利用再入飞行中的测量数据进行状态和参数估值。数据包括体轴角速率和过载，由固连于飞行体的速率陀螺和加速计给出。
The emphasis is put on estimating the states and parameters only on the basis of the re-entry on-board measurement data in the absence of trajectory observation data.
重点解决在没有轨道观测数据的情况下，如何利用再入飞行中的测量数据进行状态和参数估值。数据包括体轴角速率和过载，由固连于飞行体的速率陀螺和加速计给出。
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