车载遥测站天线标校复查中存在的问题及对策

车载遥测跟踪站天线展开后,需要进行远场标校复查。由于受标校距离、天线仰角以及周围环境等各种条件的限制,使得主天线、引导天线的光电轴匹配检查难以保证精度要求,从而影响跟踪性能。针对这些问题,本文提出在近场条件下直接悬挂信标机进行标校复查,以保证光电轴匹配精度。并针对YQ- 312 S频段遥测跟踪车载站的实际推出角度转换公式。最后给出实例     

信息融合方法在组网数据处理中的应用

在实际应用中往往采用多测向站来测定位置信息。对多个测向站测量数据的综合处理,关系到如何正确应用所得测向数据信息的重要问题。针对多个测向站的冗余方案,给出了数据融合的应用方法。     

舱外航天服热控系统仿真

针对人体穿着航天服处于过热状态下的散热问题，在分别建立人体热调节系统、金属氢化物冷源和液冷服数学模型的基础上，将3个模型进行结合，对舱外航天服热控系统在5．5h的时间轴上进行综合的仿真计算，求出人体各节段的温度分布情况，液冷服的入口及出口水温，金属氢化物冷源的出口水温等参数，分析航天员的热舒适性，对航天服热控系统的设计有一定的指导作用，并为今后进一步的研究打下了基础．     

航天飞机机翼外形优化的初步设计方法

介绍了在满足高超音速再入横向机动航程，高超音速再入飞行时的升阻比，亚音速进场飞行时的升阻比，纵向静稳定性裕度和水平着陆速度等飞行性能设计要求下，用罚函数法寻求使航天机机翼质量为最小的我形优化方法并给出了算例。     

空间重粒子击中卤虫卵的定位技术及其生物效应

为了能够估价空间重粒子对单个生物细胞的放射生物学效应,我们设计、制成了卤虫卵-核乳胶夹层式生物包.经搭载我国“8885”卫星飞行数天后回收.用图象分析仪研究了空间重离子在核乳胶上留下的径迹及其分布;并实验观察了卤虫卵的前期发育情况.看到:随星飞行过的卤虫卵与地面对照组相比,其发育能力明显降低,表现为孵化率低且发育时间推迟.实验表明:生物样品板-核乳胶影象定位技术能清楚而比较准确地给出卤虫卵(或其他生物细胞)受重离子作用的信息,是重离子生物效应及其作用机理研究的可行实验手段及分析方法之一.     

多个自由飞行空间机器人协调操作运动规划

本文提出了在空间微重力环境下多个自由飞行空间机器人协调操作运动规划算法，首先推导出多个自由飞行空间机器人协调操作的广义雅可比矩阵，其次给出了基于该矩阵的多个自由飞行空间机器人协调操作分解运动速度控制算法，最后用计算机仿真验证了该算法的正确性。     

Analytical solution methods for eigenbuckling of symmetric cross-ply composite laminates

Based on the first-order shear deformation theory, this paper explores the analytical methods for eigenbuckling of symmetric cross-ply rectangular composite laminates with a pair of parallel edges simply supported and the remaining two edges arbitrarily constrained. The main con-tribution of present paper lies in two aspects: one is to present a simple and effective analytical method, namely, the separation-of-variables method, which can generate the closed-form buckling solutions without any computational difficulty;the other is to incorporate the accurate computation method of exponential matrix into the state space technique to avoid the inevitable numerically ill-conditioned problems reported in several literatures. The results obtained via both analytical meth-ods are identical, and a good agreement with their counterparts in literature is observed. The separation-of-variables method can generate exact solutions within 1 s, which is impossible if the state space method is employed. Besides, the combination of the accurate computation method of exponential matrix and the state space method greatly improves the computational efficiency and gives correct results compared with the straightforward use of state space method.     

Satellite orbits in Levi-Civita space

In this paper we consider satellite orbits in central force field with quadratic drag using two formalisms. The first using polar coordinates in which the satellite angular momentum plays a dominant role. The second is in Levi-Civita coordinates in which the energy plays a central role. We then merge these two formalisms by introducing polar coordinates in Levi-Civita space and derive a new equation for satellite orbits which unifies these two paradigms. In this equation energy and angular momentum appear on equal footing and thus characterize the orbit by its two invariants. Using this formalism we show that equatorial orbits around oblate spheroids can be expressed analytically in terms of Elliptic functions. In the second part of the paper we derive in Levi-Civita coordinates a linearized equation for the relative motion of two spacecrafts whose trajectories are in the same plane. We carry out also a numerical verification of these equations.     

美军天基通用数据链分析

高技术条件下的现代战争，作战样式已经发展到由指挥控制系统、侦察监视系统、联合火力打击系统等各种系统构成的作战体系的对抗，战场中能否获取信息优势将决定战争的成败。在介绍美军数据链发展历程和通用宽带数据链发展概况的基础上，着重分析了美军天基通用数据链的前期技术验证情况和未来实战应用模式，以期对开展相关领域论证研究具有一定的参考意义。     

How Galactic Cosmic Ray models affect the estimation of radiation exposure in space

The radiation environment in space is a major concern for human spaceflight because of the adverse effects of high levels of radiation on astronauts’ health. Therefore, it is essential to perform radiation risk assessments already during the concept studies of a manned mission. Galactic Cosmic Rays (GCR) have been identified to be one of the primary sources of radiation exposure in space.