一种2π视场高分辨热等离子体分析仪设计与仿真

针对空间热等离子探测中大通量动态范围、宽视场和高分辨率的需求,以带顶盖球形静电分析器为基础设计了2π视场热等离子体分析仪(Hot plasma analyzer, HPA),探测性能得到显著提升。通过优化球形剖面视场偏转系统以及粒子光学系统,实现对热等离子体的2π视场高角度分辨率探测,可探测能量范围覆盖50 eV~20 keV,能量分辨率优于10%。利用顶盖电压控制方式实现几何因子在两个量级内连续可调,可以满足对太阳风和磁层热等离子体的全空间高分辨探测需求。     

The Swift Supergiant Fast X-ray Transients Project: A review,new results and future perspectives

We present a review of the Supergiant Fast X-ray Transients (SFXT) Project, a systematic investigation of the properties of SFXTs with a strategy that combines Swift monitoring programs with outburst follow-up observations. This strategy has quickly tripled the available sets of broad-band data of SFXT outbursts, and gathered a wealth of out-of-outburst data, which have led us to a broad-band spectral characterization, an assessment of the fraction of the time these sources spend in each phase, and their duty cycle of inactivity. We present some new observational results obtained through our outburst follow-ups, as fitting examples of the exceptional capabilities of Swift in catching bright flares and monitor them panchromatically.     

Comparative study of high-latitude,mid-latitude and low-latitude ionosphere on basis of local empirical models

The analysis of the regular features of the high-, mid- and low-latitude ionosphere characteristics has been carried out using local empirical models. The local empirical models were derived from the manual scaled ionogram data recorded by DPS-4 Digisondes located at Norilsk (69 N, 88E), Irkutsk (52 N, 104E) and Hainan (19 N, 109E) for a 6-year period from December, 2002 to December, 2008. The technique used to build the local empirical model is described. Primary focuses are diurnal, seasonal and solar cycle variations of the peak electron density and the peak height under low solar activity and their changes with increasing solar activity. The main objective of the paper is to reveal both common and specific features of high-, mid- and low-latitude ionosphere. Based on earlier comparisons with the International Reference Ionosphere model, we analyze how the common and specific features are reproduced by this model.     

The INTEGRAL view of Gamma-Ray Bursts

After more than six and half years in orbit, the ESA space observatory INTEGRAL has provided new, exciting results in the soft gamma-ray energy range (from a few keV to a few MeV). With the discovery of about 700 hard X-Ray sources, it has changed our previous view of a sky composed of peculiar and “monster” sources. The new high energy sky is in fact full of a large variety of normal, very energetic emitters, characterized by new accretion and acceleration processes (see also IBIS cat4 (Bird et al., 2010). At the same time, about one GRB/month is detected and imaged by the two main gamma-ray instruments on board: IBIS and SPI. In this paper, we review the major achievements of the INTEGRAL observatory in the field of Gamma-Ray Bursts. We summarize the global properties of Gamma-Ray Bursts detected by INTEGRAL, with respect to their duration, spectral index, and peak flux distributions. We recall INTEGRAL results on the spectral lag analysis, showing how long-lag GRBs appear to form a separate population at low peak fluxes. We review the outcome of polarisation studies performed by using INTEGRAL data. Finally, concerning single GRB studies, we highlight the properties of particularly interesting Gamma-Ray Bursts in the INTEGRAL sample.     

一种空间飞行器控制系统软件协同演化方法

针对空间飞行器控制系统软件在开发演化时存在管理复杂、开发过程无序、协同度低的问题,提出一种空间飞行器控制系统软件协同演化的方法。首先对软件演化过程中的演化活动、演化策略进行了分析,之后基于对软件演化活动所得到的演化路径利用有向图进行了建模并给出了其演化活动的排序,最后,对演化路径有向图中出现的并行活动和环的情况进行分析,同时给出了相适应的排序算法。基于该方法,软件演化过程得到规范,较好的解决了复杂情况下演化路径求取困难的问题。     

激光绝对测距中相位信号的数字处理方法综述

随着工业4.0时代的来临,精密测量的技术发展变得越来越重要。绝对距离测量作为精密测量的一个重要组成部分,其测量精度离不开对信号相位信息的分析,而相位信息一般可以通过数字处理方法来获得。本文介绍了激光绝对距离测量中涉及到的相位信号数字处理方法的相关原理及应用。     

某型导弹控制系统的鲁棒稳定性分析

研究了导弹控制系统的鲁棒稳定性。首先建立了导弹的广义状态空间模型， 针对这类难以转化为标准一阶状态空间模型或转化后少数不确定参数将以复杂的非线性函数方式扰动整个参数矩阵系统的特点， 建立了由广义模型描述不确定系统的鲁棒稳定性判据， 将其化为线性矩阵不等式（ Ｌ Ｍ Ｉ） 的形式， 从而用凸优化算法来判定。最后将所得到的结果应用于某型导弹控制系统的鲁棒稳定性分析。结果表明在所设计的控制律下， 在攻击过程中为鲁棒稳定。     

定位误差的简单计算法

定位误差的计算是夹具设计是必须要做的一项工作，本文从明确相关概念、理清计算思路人手，介绍了相对简单的定位误差的计算方法     

利用公开密钥密码系统和硬件设备进行软件保护

介绍使用公开密钥密码系统配合硬件来进行软件保护的方法 ,并给出具体的操作过程     

在轨跟踪与数据中继卫星测控关键技术(上)

根据卫星轨道根数，研究了跟踪与数据中继卫星（TDRS）对用户星的精确跟踪规律，并据此分析了TDRS对卫星平台姿态和天线运动范围的要求。介绍了TDRS测控中的关键技术，如螺旋扫描算法在TDRS搜索用户星时的应用、TDRS对近地卫星的覆盖率、TDRS跟踪多用户星的资源分配准则、星蚀和日凌计算，以及轨道位置保持控制策略等。相关控制策略的正确性已在我国地球同步轨道卫星的在轨测控应用中得到了证实，可用于未来TDRS的工程测控和业务应用。