带时间窗的相控阵雷达实时任务调度方法

为了解决传统相控阵雷达任务调度中采用基于工作方式优先级的方法而存在忽略任务时间紧迫性和重要性的问题,提出了一种基于任务自身工作方式优先级、截止期和空闲时间3个特征参数的相控阵雷达任务调度方法,通过调整参数的权重来适应调度器不同的负载情况,并采用时间窗处理发生冲突的任务请求,确保更多的高优先级任务在调度间隔内被调度。仿真结果表明,所提出的方法能够有效提高任务的调度成功率,明显改善调度器性能。     

环境温度对导弹发动机点火时机的影响及控制策略

针对埋入式进气道在发动机点火时刻对导弹飞行攻角的严格限制,提出了攻角点火窗口的概念;以助推器在低温、常温和高温下的推力数据为基础,分别计算了导弹飞行攻角进入攻角点火窗口的时刻,并对时刻差异进行动力学分析;为消除环境温度变化对点火指令发出时机的影响,引入伪攻角信号,设计攻角控制律。半实物仿真结果表明,该控制方法能有效消除环境温度变化对导弹飞行攻角进入攻角点火窗口时刻的影响,且能够使导弹攻角在发动机点火过程中保持稳定,具有一定的工程实用价值。     

Guns for Butter? Empirical Evidence from China

Abstract

This study examines the causal nexus between defence spending and education expenditure in China using the bootstrap Granger full-sample causality test and sub-sample rolling window estimation. The full-sample result indicates that there is no causality between defence spending and education expenditure. By adopting a time-varying rolling window approach to revisit the dynamic causal relationships, this article identifies a negative unidirectional causality running from education expenditure to defence spending. The finding suggests that it is the education expenditure crowds out defence spending in China rather than reverse. No causality is demonstrated from defence spending to education expenditure, indicating that an increase in military spending will not crowd out expenditure on education. The results could be partly explained by that the education expenditure in China is below the requirement of corresponding economic growth, urging for more financial budget. Whereas the findings support a negative trade-off between defence and education expenditures, they refute the theory of ‘guns for butter’.     

电致变色性和智能窗的发展及应用

对电致变色现象及机理、电致变色器件的构成、电致变色使用的材料等方面的国内外研究现状及发展趋势作了介绍和论述.最后对电致变色器件的应用前景作了展望.     

基于地基多传感器融合的无人机自主着陆引导方法

针对无人机自主着陆过程中卫星导航系统易被干扰的问题,提出了一种基于地基多传感器融合的无人机自主着陆引导方法。首先采用主动式激光照射的方式,获取机载反射棱镜的近红外成像,在红外图像中对无人机目标进行识别;然后通过坐标转换将识别结果映射到可见光图像中,在可见光图像中选择的感兴趣区域进行可见光目标识别,从而在降低计算量的基础上获得更加精确的无人机相对角度信息;最后利用距离测量信息和引导系统角度信息可以获得精确的无人机相对位置。无人机着陆引导试验结果表明,该方法能够提供精确的无人机位置信息,能有效适应于复杂背景下的无人机自主着陆引导。     

空降车着陆缓冲过程车体动态应力仿真研究

为了研究空降车着陆缓冲过程车体结构冲击响应,建立了车体有限元模型,运用显式有限元方法,结合实车空投试验的冲击加速度数据,以力的形式模拟车体着陆缓冲过程所受的冲击,仿真得到普通、恶劣和极限3种工况下着陆缓冲过程车体应力分布。结果表明:在3种着陆工况下,空降车左后立柱底端均为应力最大位置。研究结果可为空降车空投寿命预测及装备保障提供依据。     

一种快速抑制单脉冲雷达角闪烁的方法

一种小窗口的快速中值滤波方法能够有效抑制比幅单脉冲末制导雷达角跟踪中的角闪烁。该方法根据比幅单脉冲雷达测角原理,在测角之后对测量结果以小窗口中值滤波的方式进行处理,最大程度上保留测角结果的细节信息又能够有效地抑制角闪烁,并且有较低的运算量。通过对仿真及实测数据的处理,表明该算法可以明显降低末制导雷达在接近目标时角闪烁的影响,有效提高雷达角跟踪精度。     

未来空域窗体制下的高炮抗击反辐射导弹模型研究

针对高炮近程防空反导中存在的问题,以未来空域窗射击理论为基础,提出了高炮抗击反辐射导弹的单层未来空域窗指标论证模型,着重对弹幕的散布密度和武器系统的射速进行了研究。通过对模型的仿真计算,验证了模型的合理性,并对高炮抗击反辐射导弹的相关指标给出了建议。     

Reliability of linear multistate multiple sliding window systems

This paper proposes a new model that generalizes the linear consecutive k‐out‐of‐r‐from‐n:F system to multistate case with multiple failure criteria. In this model (named linear multistate multiple sliding window system) the system consists of n linearly ordered multistate elements (MEs). Each ME can have different states: from complete failure up to perfect functioning. A performance rate is associated with each state. Several functions are defined for a set of integer numbers ρ in such a way that for each r ∈ ρ corresponding function f_r produces negative values if the combination of performance rates of r consecutive MEs corresponds to the unacceptable state of the system. The system fails if at least one of functions f_r for any r consecutive MEs for r ∈ ρ produces a negative value. An algorithm for system reliability evaluation is suggested which is based on an extended universal moment generating function. Examples of system reliability evaluation are presented. © 2005 Wiley Periodicals, Inc. Naval Research Logistics, 2005.     

中口径舰炮对空闭环校射

首先建立了中口径舰炮武器系统对空闭环校射数学模型,比较新颖地解决了波门指示、弹序判别、滤波方法、脱靶量的求取和预测以及漏测弹丸的措施等一系列问题,通过仿真模拟明显地提高了系统精度和命中率,并使其工程化嵌入某型航炮系统,在工程上得以实现