基于方位角和多普勒的机动目标无源定位跟踪可观测条件

可观测性分析是无源定位与跟踪系统的前提和基础,只有满足可观测条件才能对系统进行正确求解。应用线性系统理论,以目标方位角和多普勒频率为观测量,对匀加速和匀转弯这两类最常见的机动目标进行了可观测分析,为进一步研究机动目标的无源定位与跟踪提供了理论前提。最后给出了仿真实例,验证了理论分析的正确性。     

Cyclic preference scheduling for nurses using branch and price

This paper presents a new methodology to solve the cyclic preference scheduling problem for hourly workers. The focus is on nurse rostering but is applicable to any organization in which the midterm scheduling decision must take into account a complex of legal, institutional, and preferential constraints. The objective is to strike a balance between satisfying individual preferences and minimizing personnel costs. The common practice is to consider each planning period independently and to generate new rosters at the beginning of each. To reduce some of the instability in the process, there is a growing trend toward cyclic schedules, which are easier to manage and are generally perceived to be more equitable. To address this problem, a new integer programming model is presented that combines the elements of both cyclic and preference scheduling. To find solutions, a branch‐and‐price algorithm is developed that makes use of several branching rules and an extremely effective rounding heuristic. A unique feature of the formulation is that the master problem contains integer rather than binary variables. Computational results are reported for problem instances with up to 200 nurses. Most were solved within 10 minutes and many within 3 minutes when a double aggregation approach was applicable. © 2006 Wiley Periodicals, Inc. Naval Research Logistics, 2007.     

基于理想干涉的InSAR处理性能评估新方法

为克服常规的InSAR处理性能评估方法只能分析整体性能的缺点,提出一种适用于分布式星载InSAR的理想干涉相位图仿真算法,此算法不仅能得到理想干涉相位,而且能得到理想情况下的配准偏移量。在此基础之上,提出一种基于理想干涉相位及理想配准偏移量(统称为理想干涉量)的InSAR处理性能评估新方法。此方法可以有效隔离InSAR处理流程各个环节的误差,对InSAR处理流程的各个环节的算法优化具有重要的实用价值。     

基于十字靶标的人控交会对接仿真

为了减轻航天员的负担,提高人控对接成功率,建立人控交会对接仿真系统是很有必要的。通过对追踪飞行器和目标飞行器的动力学模型分析,建立了人控交会对接仿真系统的基本框架,并基于十字靶标进行了相应的仿真实验。实验结果表明航天员经过一定的训练后,可以通过操作手柄控制追踪飞行器的位置和姿态,实现航天器的交会对接。为降低操作的复杂程度,航天员可以只进行位置控制,而把姿态控制交给自控系统,这样手控对接的成功率会更高。     

HLA数据回放及其可通用性问题研究

为了给HLA分布仿真系统提供运行数据的回放能力并解决各种回放策略都必须面对的数据完备、时序准确、运行高效及回放方法的可通用性等问题,对HLA联邦中的数据回放问题进行了研究,分析了HLA仿真中的回放需求以及HLA对回放实现技术的影响,指出回放方法的可通用性实质上是联邦独立性的概念,研究了将回放数据对象化处理的方法,针对成员式数据回放策略、基于对象序列化技术和成员自动生成技术提出了一种可通用的HLA数据回放实现方案,最后介绍了通用HLA数据回放工具的应用情况。     

高动态GPS抗干扰算法仿真研究

对于高动态条件下GPS(global positioning system)接收机的抗干扰问题,研究等距线阵接收信号模型和基于协方差矩阵扩张的基本原理,并仿真分析了2种基于协方差矩阵扩张的经典抗干扰算法:Mailloux算法和Zatman算法在高动态环境下的作用效果.经过Matlab仿真,结果表明,相比与常规方法,Ma...     

Classical geopolitics,realism and the balance of power theory

Since the end of World War II, classical geopolitics as a particular form of realism has been disengaged from the development of mainstream realist theories. This disengagement has not only concealed the value of classical geopolitics as a framework of analysis for policy and strategy, but also created an increasing rift between theory and policy in contemporary realist theories. This paper seeks to reengage classical geopolitics with mainstream realist theories by clarifying its realist traits and analytical characteristics, (re)stating its core propositions and probing into its potential contribution to the development of mainstream realist theories. This paper contends that classical geopolitics, while having a distinctive pedigree, can arguably be considered an integral part of the family of realist theories in view of its basic theoretical assumptions concerning international anarchy, the unit of analysis and power politics. As a framework of analysis, classical geopolitics incorporates three interrelated strategic propositions. Those three propositions not only constitute the theoretical core of classical geopolitics, but also manifest a peculiar balance-of-power conception that is essentially distinct from those proposed by mainstream realist theories. This paper argues that those three propositions combined promise to fill in prominent lacuna in the balance-of-power research programme, and also have significant implications for contemporary world politics.     

宇宙高能质子致单粒子翻转率的计算

通过简化半导体器件灵敏单元 ,计算得到了宇宙高能质子在器件灵敏单元内产生的能量沉积。然后利用地面重离子实验单粒子翻转数据得到的Weibull函数 ,计算了CRRES卫星轨道、 33mm铝屏蔽壳体内几种器件的单粒子翻转率 ,并与已有结果进行了比较说明。     

舰载导弹垂直发射系统的综合测控系统

通过对舰载导弹垂直发射系统中贮运发射箱内环境监控、导弹综合测试、发射过程控制、射击参数装定以及应急状态自动处理等需求分析,提出建立综合测控系统方案,并探讨了以LONworks总线为核心的综合测控系统基本结构、组成和功用.     

数字磁阻磁场仪在自行式武器导航中的应用

介绍了以磁阻传感器为基础的数字磁阻磁场仪HMR2300的基本原理及其在自行式武器系统导航中的应用,重点叙述了在车体倾斜和有金属材料影响的情况下,对HMR2300输出结果的补偿和计算方法.