配用电容近炸引信的弹体电荷分布规律

探讨配用电容引信的弹体电荷分布规律 ,以准确建立电容目标探测方程 .采用连续电荷离散分析法 ,依据库仑定律建立弹体电荷动态平衡方程组 ,分析其解算结果 .给出了 4种不同d0 /L(电极间距与弹长之比 )值下的弹体电荷分布曲线 .其结论是 :弹体电荷密度自靠近前电极的一端至弹尾逐步衰减 ;沿弹体 ,电荷量分布的衰减率受d0 /L值的制约 ,d0 /L值越小 ,其衰减率越大 ,反之亦然     

JEM调制效应引起的防空导弹雷达引信早炸问题研究

通过理论分析和数字仿真,研究了JEM调制效应引起的频谱特征以及引起防空导弹雷达引信早炸问题的根本原因,给出了克服引信早炸的技术途径,设计了相应的电路,具有一定的实用价值。     

某型防空导弹野战便携式综合测试系统的研究与设计

详细阐述了某型防空导弹野战便携式综合测试系统的需求分析、工作原理、系统结构设计和关键技术。该系统解决了某型防空导弹战斗装备性能参数的测试问题,是决定便携式防空导弹能否完成战斗任务的重要因素。该系统的研发,使防空导弹分队整体战斗力得到普遍提高,具有较大的军事效益。     

用基于指数标度的层次分析法评估红外导弹导引头抗干扰性能

传统的层次分析法通常采用1～9标度量化判断矩阵,由于人为主观因素的影响,可能导致评估的结果不够准确、客观,不便用于红外导弹导引头抗干扰性能的评估.文中主要采用指数标度法对层次分析法加以改进,介绍了指数标度法的原理,根据工程中导弹研制过程划分的3个阶段及各研制阶段相应的测试手段,构建了用于导引头抗干扰性能评估的3层结构,应用指数标度量化判断矩阵,且计算得出判断矩阵是一致最优的,降低了人为主观因素的影响,最后以某型导弹数字仿真数据为依据进行了评估计算加以验证.     

Study on detonation velocity deficits of bending flexible detonation fuses

In order to study the detonation velocity deficits of bending flexible detonating fuses,a physical model and a theoretical mathematical equation of detonation velocity deficits for bending flexible det...     

公共建设项目工期延误风险研究

工期延误是公共建设项目中常见的现象,以工期延误率△T来度量建设项目工期的变化,通过问卷调查和实地访谈,对影响建设项目工期的风险因素进行了调查,收集了深港两地515个公共建设项目的工期实际数据,利用逆高斯分布函数建立了评估工期延误风险的定量模型,并通过风险因素的相对重要性评分识别出了影响建设工期的前15位风险因素,这些风险因素分别来自业主、承包商、分包商、政府部门及其他5个方面.研究表明,通过对这些风险因素的识别,可以帮助项目决策者有针对性地采取预防措施,减少风险对项目建设工期的影响.     

基于稳定性分析的寻的制导约束问题研究

基于平面拦截模型,给出了比例导引制导系统的有限时间鲁棒绝对稳定和输入输出稳定的条件,在此基础上针对有界的任意目标机动,分析了制导系统性能对弹体动态特性、可用过载和制导规律等因素的要求,给出了制导控制系统设计的边界条件.仿真结果验证了边界条件的可行性和有效性.     

Influence of the second-order ionospheric delay on GPS PPP time transfer

In view of the practical problem that the second-order ionospheric delay error (Ion2) is not corrected in Precise Point Positioning (PPP) time transfer,the PPP observation equation with the Ion2 is derived.The PPP clocks and time transfer with and without the Ion2 correction are compared and analyzed using two test periods.Based on the measured data,analysis shows that the influence of the Ion2 on the PPP clocks at a low-latitude are more significant than that of mid-latitude and polar regions.The difference series of PPP clock solutions shows fixed deviation plus some diurnal variations,and the sign of fixed deviation is opposite in the northern and southern hemispheres.The maximum influence of the Ion2 on the long time-links transfer can be up to more than 26ps,but for the short time-links,it can be ignored.Therefore the Ion2 correction is necessary for sub-nanosecond PPP time transfer over long time-links,especially when the time-links are made by the stations located in low-latitude regions.     

Method of time delay measurement based on fast maximum likelihood for pulsar pulse profile

The time delay of the pulsar integrated pulse profile relative to the standard pulse profile is one of the important observations in an X-ray pulsar-based navigation system, with the measuring accuracy directly affecting the the pulsar-based navigation system. In order to improve the measuring accuracy of the time delay of the pulsar integrated pulse profile and reduce the computation complexity, a method called fast maximum likelihood (FML) estimation is proposed in this paper, which first distills the pulse profile of the X-ray pulsar by the epoch folding. Then, the likelihood function is estimated to obtain the time delay of the pulsar integrated pulse profile. This paper also improves the fast maximum likelihood time delay estimation by narrowing the phase interval of the standard pulse profile and combines rough estimation with accurate estimation to effectively compute the time delay. Real pulsar data observed by the Rossi X-ray Timing Explorer (RXTE) are used to validate the effectiveness of the proposed method from the aspects of the observed time and computational complexity. Compared with the Taylor FFT algorithm, the measurement accuracy of the proposed method can be significantly improved while keeping the total computational complexity.     

基于TOEO的频率和真延时可调波形产生方法

针对多种微波光子技术在雷达中的综合运用,提出了一种基于可调谐光电振荡器（TOE0）的频率和真延时独立可调的一体化线性调频波形光产生方法．首先利用可调谐光电振荡器实现频率可调谐,然后通过马赫增一德尔调制器（MzM）对其产生的信号进行脉冲调制,最后经由偏振调制器（PolM）同时实现线性调频与真延时．理论分析和仿真实验证实了所提方法具有频率和真延时独立可调谐的能力．该方法对宽带相控阵雷达波形产生与波束形成具有重要意义．