时间跨度对GPS坐标序列噪声模型及速度估计影响分析

选取全球范围内72个基准站的坐标序列,采用改进的赤池信息量准则、贝叶斯信息量准则对不同噪声模型组合进行噪声分析,得到基准站坐标序列的最优噪声模型及速度参数,探讨时间序列跨度对噪声模型及速度估计的影响。结果表明,基准站坐标序列噪声模型不能由单一的噪声模型表述,其呈现出多样性特征,主要表现为幂律噪声、高斯马尔科夫噪声、闪烁噪声+白噪声特征,且三坐标分量表现出不同的噪声特性;随着时间跨度的增加,坐标时间序列的最优噪声模型、GPS站速度及其不确定度逐渐由发散趋于收敛,随机游走噪声模型的比重有所增加。结果表明10 a以上的时间跨度是较为理想的噪声模型估计尺度。     

基于多传感器信息融合理论的无人机相对导航状态估计方法

为提升无人机的作战效能和作战指标,提升无人机的相对导航精度和导航系统可靠性,本文以无人机编队的相对导航系统为研究背景,基于容积卡尔曼滤波算法和信息滤波算法,研究了容积信息滤波算法。此外,还采用了多传感器信息融合理论,利用分布式信息融合结构构建了无人机相对导航滤波器,对来自惯导、视觉和卫星的信息进行融合,获取无人机间的相对位置、速度和姿态信息。该方法提升了无人机相对导航的导航精度、导航可靠性和滤波稳定性,容积信息滤波算法的应用避免了传统滤波算法在在高维系统中出现的数值不稳定以及精度降低等问题。论文还进行了相应的数学仿真,仿真结果表明该方法提高了无人机编队之间相对导航的精度和可靠性,证明了算法的有效性。     

卫星导航抗干扰最优接收机与相关接收机性能分析

为减小抗干扰接收机硬件实现难度,深入研究单天线卫星导航抗干扰相关接收机的性能,并详细分析其频域响应、信干噪比损耗和相关输出函数。分析表明,抗干扰最优接收机与相关接收机信干噪比损耗随着干扰带宽和干扰强度的增加而增大,随干扰频率与中心频率偏差和噪声带宽的增加而减小。此外,干扰将引起抗干扰接收机匹配与相关输出主峰降低和旁瓣抬高,从而影响接收机捕获、跟踪和多径抑制性能。研究结果将为卫星导航抗干扰接收机的优化设计提供依据。     

基于星间链路GNSS自主完好性加权算法

全球卫星导航系统在自主导航工作模式下,传统的地面支持完好性系统无法满足用户的完好性要求。因此提出一种基于星间链路的全球卫星导航系统(GNSS)自主完好性加权算法,通过改进稳健估计理论中的M-估计对星间链路测距加权的计算方法,降低故障卫星星间测距值的影响,以保持星座自主时间同步和精密定轨处理的连续、稳定与精度。仿真结果表明,在一颗及两颗故障卫星情况下,基于星间链路的GNSS自主完好性加权算法,可以有效地消除故障卫星对自主导航精密定轨的影响,星座具有与无故障时相当的自主定轨精度。     

空军地面雷达信息综合技术

空军地面雷达信息综合技术研究是以面向防空作战任务的战场信息共享支持为目标,借助先进的通信体系结构和技术体制,将各级雷达信息有机地集成起来,形成一体化的战场信息共享支撑体系,以提高我军联合指挥控制能力.     

基于Web技术的通用导弹装备保障信息管理研究

分析了通用导弹装备保障管理工作的实际需求 ,研究了网络数据库系统的体系结构及Web数据库的有关技术 ,基于B/S (Browser/Server)结构 ,采用Java动态网页技术 (JSP)设计了Web服务平台 ,实现了管理、发布动态Web数据库信息的功能。     

Information sharing in multinational security and military operations. Why and why not? With whom and with whom not?

Military operations increasingly require cooperation between agencies within the same nation, but also collaboration with security and military organizations internationally. Throughout history multinational military cooperation has often been an appropriate way to conduct major operations; national manpower and material resources are generally insufficient to address the demands of missions worldwide. The desire to optimize the use of scarce research and development and investment capabilities, the need for international legitimacy and political support, and the fact that today’s risks transcend national borders, have rendered multinational cooperation in the security domain unavoidable. With joint operations comes the requirement for multi-partner- and multinational information sharing. However, information sharing has both advantages and costs, and is subject to both enabling factors as well as barriers. This paper reflects on theories, both classical and current, as well as empirical case studies, to examine the pros and cons of multinational information sharing, and the factors that conduce or interfere with the transmission and the receipt of intelligence. The importance of a holistic approach and of learning lessons learned are two key lessons gleaned from the analysis, along with an emphasis on developing both the organizational and the interpersonal enablers of information sharing.     

Spatial Distribution of Minority Communities and Terrorism: Domestic Concentration versus Transnational Dispersion

Qualitative studies of terrorist movements frequently highlight the importance of diaspora communities as important factors in producing and sustaining terrorist activity in countries. The underlying theoretical argument is that bifurcation of tight-knit minority communities between countries nurtures separatist or irredentist sentiments among affected community members, thus prompting terrorist activity, while minority community members in other countries might mobilize financial and political resources to support terrorist activity among their compatriots. In this study, we empirically test whether transnational dispersion, versus domestic concentration, of minority communities in countries produces higher incidents of terrorism. Conducting a series of negative binomial estimations on a reshaped database of around 170 countries from 1981 to 2006, derived from the Minorities at Risk database and the Global Terrorism Database, we determine that both transnational dispersion of kin minority communities and domestic concentration of minorities within countries increase terrorism and that transnational dispersion is a particularly robust predictor of terrorist attacks.     

基于粗糙集的武器装备体系贡献度评估方法

有效评估体系贡献度,是武器装备发展论证、作战试验开展和作战使用保障的一项基础性工作。分析了武器装备体系贡献度的概念内涵,构建了武器装备体系贡献度评估指标体系,给出了基于粗糙集的武器装备体系贡献度评估模型与步骤,并进行了算例评估与验证分析。研究工作表明,粗糙集评估法较好地解决了评估数据少、模糊或者不确定的问题,对难以完全量化系统的武器装备体系贡献度评估提供了新的解决思路与具体方法。     

Modeling and realization of real time electronic countermeasure simulation system based on SystemVue

In this paper, we proposed a new design scheme of real time electronic countermeasure simulation system. This paper mainly expounds the modeling and realization methods of each part of the whole simulation system, and the real-time property of system has been lucubrated. Electronic countermeasure simulation system is the key part of military training of individuals; it can also allow the realistic evaluation of the performance of modern equipments and techniques. As a proof, we have drawn up a series of simulation scenarios, such as radar electronic reconnaissance simulation scenario, to explain the feasibility and the superiority of our modeling scheme in this paper.