Optimal network topology of relative navigation and communication for navigation sharing in fractionated spacecraft cluster

Navigation sharing as a key technology provides orbit and attitude information broadcasting for the whole fractionated spacecraft cluster (FSC). The navigation sharing concept has already been proposed for some years. However, the problem of achieving the optimal navigation sharing by designing the proper network topology is still unsolved, especially in the case that some members of the cluster have absolute navigation devices, some just have relative navigation devices and some only have communication devices. In this paper, a comprehensive model of describing the navigation sharing problem in FSC is proposed. The model of network topology constructing by relative navigation links and communication links is established. By using the graph theory and genetic algorithm as the tool, the conditions for navigation sharing in FSC with different sharing degrees are obtained. Finally, some examples are presented to test the methods, and it has been found that, the absolute positions and attitudes of all the members can still be determined even some members in FSC have no absolute navigation devices.     

基于融合诊断的某型飞机故障诊断应用研究

以某新型军用飞机的电传操纵系统为研究对象,分析了案例推理和故障树诊断的方法。在此基础上,提出了将两种方法进行融合的思想,开发了通用化的故障诊断软件,大大提高了故障诊断效率,对第三代飞机的故障诊断提供了一种有效的途径。     

Integrated Safety Culture Model and Application

A new safety culture model is constructed and is applied to analyze the correlations between safety culture and SMS. On the basis of previous typical definitions, models and theories of safety culture, an in-depth analysis on safety culture＇s structure, composing elements and their correlations was conducted. A new definition of safety culture was proposed from the perspective of sub-culture. 7 types of safety sub-culture, which are safety priority culture, standardizing culture, flexible culture, learning culture, teamwork culture, reporting culture and justice culture were defined later. Then integrated safety culture model （ISCM） was put forward based on the definition. The model divided safety culture into intrinsic latency level and extrinsic indication level and explained the potential relationship between safety sub-culture and all safety culture dimensions. Finally in the analyzing of safety culture and SMS, it concluded that positive safety culture is the basis of im plementing SMS effectively and an advanced SMS will improve safety culture from all around.     

运载火箭平台惯导系统杆臂效应对入轨精度的影响

针对运载火箭平台惯导系统杆臂效应对入轨精度的影响进行了研究和分析，并给出了仿真结果。     

变长竿式制导问题数学模型

制导问题数学模型对研究交会及拦截问题都具有重要意义，本文提出一种变长竿式制导问题数学模型，此模型视线被当作一条变和旋转竿，通过研究其旋转，长度变化来研究制导系统性能，比常用模型含有更多关于制导问题性能的信息。用它释放了比例导引律下小视线距视线角速率失稳原因，提出了制导系统视线全值域角速率稳定以提高制导精度的设计方法，讨论了比例导引能否实现预测栏截问题等。     

Environmental reference systems for large-scale spaces

Human navigation in well-known environments is guided by stored memory representations of spatial information. In three experiments (N = 43) we investigated the role of different spatial reference systems when accessing information about familiar objects at different locations in the city in which the participants lived. Our results indicate that two independent reference systems underly the retrieval of spatial knowledge. Environmental characteristics, e.g., the streets at an intersection, determine which headings are easier to imagine at a given location and lead to differences in accessibility of spatial information (orientation-specific behavior). In addition, access to spatial information depends on the relative direction of a location with respect to the imagined heading, such that information about locations imagined in front of oneself is easier to access than about locations towards the back. This influence of an egocentric reference system was found for environmental knowledge as well as map-based knowledge. In light of these reference system effects, position-dependent models of spatial memory for large-scale environments are discussed. To account for the simultaneous effect of an environmental and an egocentric reference system, we present a 2-level model of spatial memory access.     

苏—27飞机燃油带式综合仪表的原理特点及维修途径

ＣＴＰ７－２ＡＫ燃油油量表－耗量表系统代表了俄罗斯当代燃油测控系统的水平。本文论述了ＣＴＰ７－２ＡＫ产品的组成、工作原理及技术特点，同国产及英美产品当前的技术水平做了比较，并在此基础上提出了今后维修和国产化的途径。     

Algorithmic support of a small-sized navigation system on the basis of the magnetoinertial course transmitter

The algorithmic support of a small-sized navigation system on the basis of the magnetoinertial course transmitter is considered; the support makes it possible to significantly reduce accumulating errors that are due to incomplete data on wind parameters and decrease requirements for random errors of initial data sensors.     

基于北斗接收机的车载卫星导航系统的设计

基于北斗卫星导航系统、北斗地基增强系统、移动通信网络,设计开发了 一款小体积、高精度车载导航系统。主要在接收基站差分信息以及实现高精度定位方面 进行探索。通过单点定位和差分定位的野外跑车对比试验得出,该系统性能稳定、可靠 性高,其差分定位精度能够满足车辆导航的要求。     

时滞系统内模控制器参数整定方法研究

针对内模原理对时滞系统控制的局限性,利用一阶泰勒级数逼近模型的时 滞部分, 推导了工业上常见的一阶时滞和二阶时滞模型的内模控制参数表达式, 结合 ITAE 指标和系统鲁棒性设计了新的目标函数, 通过对目标函数的寻优实现了内模控制 器参数的整定。仿真结果表明,该方法具有较好的动态跟踪性能、较强的抗干扰性和鲁 棒性,具有一定的工程应用价值。