稳像火控中目标角速度测量误差及滤波方法

对稳像火控系统中目标角速度的测量过程进行了分析,指出采用自动传感器测量目标角速度仍存在误差,且对射击诸元的影响较大;在计算机采集数据的有限时间段内,该误差序列为均值不为零的随机干扰噪声,采用均值—中值加权滤波方法可有效减小该嗓声对射击诸元影响.     

单片可编程数字信号处理器(DSP)在控制领域的应用趋势

分析了单片可编程数字信号处理器的特性,并着重同普通微处理器、微控制器作了结构及性能上的比较。介绍了现有的DSP 并预测了DSP 在控制领域中的应用趋势。     

惯导系统动基座对准精度评估方法

弹载惯性制导系统空中对准是机载战术导弹发射前必须完成的任务,其对准精度直接影响导弹系统的制导精度。利用最优平滑技术对弹载惯导系统传递对准效果进行评估,是分析导弹系统的战术性能和惯导系统自身器件性能的有效方法。Rauch-Tung-Striebel(1965)提出了固定区间平滑算法,Meditch(1967)提出了固定点平滑算法;Bierman(1983)、Watamabe(1989)等许多学者对RTS算法提出了改进方法,这些方法在保证平滑算法中数值的稳定性和提高计算效率方面有了明显改善。针对固定区间平滑算法所适应的对象,分析了这类平滑算法的特点,提出了RTS固定区间平滑算法的改进方法;结合弹载惯性制导系统传递对准效果评估,进一步证明了分析的正确性。     

U-D分解单步迭代滤波在飞行状态估计中的应用

针对单步迭代滤波常规算法数值鲁棒性差、滤波易于发散的缺点对误差协方差矩阵使用了 U - D分解 ,从而形成了一种基于 U - D分解的单步迭代滤波算法。该算法提高了数值鲁棒性 ,并且对相关的量测噪声有一定处理能力 ,应用于飞行状态的估计问题 ,获得了较为满意的结果     

Analysis of the finite‐source multiclass priority queue with an unreliable server and setup time

In this article, we study a queueing system serving multiple classes of customers. Each class has a finite‐calling population. The customers are served according to the preemptive‐resume priority policy. We assume general distributions for the service times. For each priority class, we derive the steady‐state system size distributions at departure/arrival and arbitrary time epochs. We introduce the residual augmented process completion times conditioned on the number of customers in the system to obtain the system time distribution. We then extend the model by assuming that the server is subject to operation‐independent failures upon which a repair process with random duration starts immediately. We also demonstrate how setup times, which may be required before resuming interrupted service or picking up a new customer, can be incorporated in the model. © 2013 Wiley Periodicals, Inc. Naval Research Logistics, 2013     

光纤陀螺温度场分析及结构优化设计

从导热微分方程出发,建立了光纤陀螺温度场有限元模型,对模型进行了稳态温度场和瞬态温度场仿真分析。利用铂电阻测温电路对仿真结果进行实验验证,两者相对误差小于3%,证明仿真分析的结果是正确和有效的。针对光纤环温度场分布不均匀的情况,对光纤陀螺结构进行了优化设计。光纤陀螺在25℃环境中稳定工作时,稳态温度场分析结果表明,优化设计后光纤环最高与最低温度差为0.05℃,较优化前的0.19℃减小了73.7%;将陀螺置于60℃环境且处于非开机状态时,10min瞬态温度场分析结果表明,优化设计后光纤环最高与最低温度相差0.11℃,较优化前的0.19℃减小了42.1%。     

一种基于灰色粒子滤波算法的机动AUV航深内测方法

本文提出了一种将灰色预测和小波变换与标准粒子滤波相结合的灰色粒子滤波算法（GPF）,并将其应用于机动AUV的航深内测。GPF针对机动AUV航深内测过程中由于AUV运动状态未知和测量噪声不断变化而导致的滤波失效问题,在粒子采样过程中结合了标准采样和灰色预测采样,保证了采样得到充分多的有效粒子。在计算粒子权重时,利用小波变换跟踪测量噪声统计特性的变化,提高了各粒子似然概率计算和权重分配的正确性。最后以外测法测得的高精度的机动AUV航深作为真实航深,对该GPF算法进行了实验对比验证,并与EKF和MMPF算法的结果作对比,实验结果表明了本文方法的有效性和实用性。     

Warning whom,for which response?

In June 2000, the Conference of Heads of State and Government of the Economic Community of Central African States (ECCAS) adopted the Protocol on the establishment of the Peace and Security Council for Central Africa (COPAX), with its two technical structures, namely the Central African Multinational Force (FOMAC) and the Central African Early Warning Mechanism (MARAC). MARAC is tasked with collecting and analysing data for the early detection and prevention of conflicts and crises. It currently consists of the Central Structure located at the ECCAS Executive Secretariat in Libreville (Gabon) and 31 Decentralised Correspondents spread throughout the ten member states of ECCAS. This article assesses the performance of MARAC in the light of its assigned objectives. Bearing in mind the peace and security challenges facing the central African sub-region, the central argument of this article is that while the establishment of MARAC is commendable, it flowed more from the logic and context of the establishment of similar mechanisms on the African continent during the same period than from any displayed capacity and/or readiness on the part of ECCAS to implement the recommendations due to emanate from such a structure.     

基于迭代卡尔曼粒子滤波的目标跟踪算法研究

粒子滤波在基于图像序列的目标跟踪中获得了广泛应用．针对其计算量较大的问题,提出一种迭代卡尔曼粒子滤波算法,将非线性跟踪问题分解为线性子结构的全局状态空间模型和非线性子结构的局部状态空间模型,利用粒子滤波在卡尔曼滤波估计值的局部范围内搜索目标,逼近真实目标状态．将实验结果与粒子滤波进行比较,结果表明,迭代卡尔曼粒子滤波减少了粒子数,降低了计算量,能够对高机动目标进行实时稳定的跟踪．     

不同导引模式下的末修弹脉冲参数优化研究

在总脉冲量确定的情形下,在启控时间、总脉冲数、最小点火时间间隔及点火阈值等脉冲参数对末修弹落点散布的影响进行详细分析的基础上,利用数值仿真的方法,对比例导引模式、抛物线导引模式、落点预测导引模式、弹道追踪导引模式和zx导引模式等常用导引模式下的脉冲参数优化进行深入分析研究．