Results from the ESA SREM monitors and comparison with existing radiation belt models

The Standard Radiation Environment Monitor (SREM) is a simple particle detector developed for wide application on ESA satellites. It measures high-energy protons and electrons of the space environment with a 20° angular resolution and limited spectral information. Of the ten SREMs that have been manufactured, four have so far flown. The first model on STRV-1c functioned well until an early spacecraft failure. The other three are on-board, the ESA spacecraft INTEGRAL, ROSETTA and PROBA-1. Another model is flying on GIOVE-B, launched in April 2008 with three L-2 science missions to follow: both Herschel and Planck in 2008, and GAIA in 2011). The diverse orbits of these spacecraft and the common calibration of the monitors provides a unique dataset covering a wide range of B-L* space, providing a direct comparison of the radiation levels in the belts at different locations, and the effects of geomagnetic shielding. Data from the PROBA/SREM and INTEGRAL/IREM are compared with existing radiation belt models.     

美国标准机载计算机AN／AYK14分析及应用研究

系统地介绍了美国海军标准机载计算机AN／AYK-14的系统结构与组成，重点讨论了AN／AYK-14的发展历程和改进情况，揭示了美国标准机载计算机向开放式结构发展的方向，最后对AN／AYK-14的应用情况进行了简介。     

对K8飞机外贸出口工作的几点思考

简要论述了K8飞机外贸出口所处的内、外部环境,在此基础上进行SWOT分析,并据此提出该飞机外贸出口工作中应采取的几项措施。     

可编程数字锁相环的研制

介绍一种可编程数字锁相环。它由单片机和数字锁相环构成。其中锁相环的工作状态和参数由单片机处理和控制。这样能较好地解决稳态误差与稳态建立时间之间的矛盾，基本上实现了在保证稳态误差小的同时，可大幅度地缩短稳态建立时间的目的，使原来的数字锁相环的性能更优。     

CAM后置处理研究

分析了数控加工后置处理技术的特征、面临的问题和当前的发展趋势,介绍了应用通用后置处理器开发定制专用后置处理器的实践。     

JL8飞机航炮吊舱卡链故障分析

通过对JL8飞机航炝吊舱供弹系统及弹带结构的分析,结合弹带在供弹道内的运动特性,找出了航炮吊舱卡停射故障产笺原因,并通过计算,提出了改进措施。     

卫星综合测试系统中多控制台管理技术改进

针对主测试处理机（MTP）在测试操作控制台（TCC）管理中存在的问题,在基于多进程的控制台管理技术基础上,提出通过守护进程动态对僵死进程进行信息收集,利用进程控制技术实现MTP对测试操作控制台管理的改进方法。该方法解决了多进程环境下MTP服务器在控制台管理上僵死进程过多的问题,提高了系统资源的利用率,增强了卫星综合测试系统的可靠性和稳定性。     

基于Eclipse的航天嵌入式软件集成 开发环境设计与实现

针对当前航天器软件研制过程中需要使用多种开发工具的问题,设计实现了集工程管理、代码编辑、语法检查、编译链接和调试测试于一体的航天嵌入式软件集成开发环境.研究成果已应用于航天器嵌入式软件的研发,缩短了软件研发周期并提高了软件质量,同时也为软件集成开发环境的研发提供借鉴.     

钛合金六角头螺栓头部成形过程的有限元分析

航空用螺栓的头部多样、形状复杂,通常情况下利用镦锻工艺成形。研究采用塑性成形仿真软件,针对Ti-6Al-4V六角头螺栓的头部成形过程进行了有限元模拟,对成形各阶段的应力、应变、温度变化以及材料流动情况进行了分析,同时对成形过程中的缺陷进行了预测,为工艺设计和改进提供了依据。     

CubeSail: A low cost CubeSat based solar sail demonstration mission

CubeSail is a nano-solar sail mission based on the 3U CubeSat standard, which is currently being designed and built at the Surrey Space Centre, University of Surrey. CubeSail will have a total mass of around 3 kg and will deploy a 5 × 5 m sail in low Earth orbit. The primary aim of the mission is to demonstrate the concept of solar sailing and end-of-life de-orbiting using the sail membrane as a drag-sail. The spacecraft will have a compact 3-axis stabilised attitude control system, which uses three magnetic torquers aligned with the spacecraft principle axis as well as a novel two-dimensional translation stage separating the spacecraft bus from the sail. CubeSail’s deployment mechanism consists of four novel booms and four-quadrant sail membranes. The proposed booms are made from tape-spring blades and will deploy the sail membrane from a 2U CubeSat standard structure. This paper presents a systems level overview of the CubeSat mission, focusing on the mission orbit and de-orbiting, in addition to the deployment, attitude control and the satellite bus.