带减振器机抖激光陀螺惯性测量单元标定方法研究

由于减振器会产生形变,使得带减振器的机抖激光陀螺惯性测量单元(IMU)不能使用由精密转台提供姿态基准的标定方法进行标定.提出了一种带减振器的机抖激光陀螺IMU标定的新方法,该方法先将IMU固联在精密转台上,不启动陀螺,依靠转台提供姿态参考标定出加表各误差参数;在此基础上装上减振器,设计了IMU陀螺误差参数标定路径,根据...     

基于参数稳态判定的两阶段序贯仿真分析策略

两阶段序贯分析方法是仿真(模拟)实验研究中的一种常用方法,它虽然可以通过控制实验给出符合精度要求的结果数据,但以其现有形式有时却无法避免冗余计算的存在和实验过早终止的可能.在回顾了现有终态仿真解算终止策略特点的基础上,分析了所需样本总数的估计值与当前可用样本间的变化关系,提出了一种基于参数稳态判定的改进两阶段序贯方法....     

基于双重酉滤波的再入目标实时跟踪

适当的运动模型和估计方法是提高再入目标跟踪性能的关键.选择机动再入动力学模型,将再入目标跟踪问题转化为状态和参数的联合估计问题,并利用试验数据分析了再入模型状态和参数的相关性.针对原始双重酉滤波算法的确定性系统输入假设造成信息损失的局限性,提出了一种基于随机性系统输入假设的改进双重酉滤波算法,并从理论上分析了该算法的估...     

Periodic review inventory management with contingent use of two freight modes with fixed costs

We study a stochastic inventory model of a firm that periodically orders a product from a make‐to‐order manufacturer. Orders can be shipped by a combination of two freight modes that differ in lead‐times and costs, although orders are not allowed to cross. Placing an order as well as each use of each freight mode has a fixed and a quantity proportional cost. The decision of how to allocate units between the two freight modes utilizes information about demand during the completion of manufacturing. We derive the optimal freight mode allocation policy, and show that the optimal policy for placing orders is not an (s,S) policy in general. We provide tight bounds for the optimal policy that can be calculated by solving single period problems. Our analysis enables insights into the structure of the optimal policy specifying the conditions under which it simplifies to an (s,S) policy. We characterize the best (s,S) policy for our model, and through extensive numerical investigation show that its performance is comparable with the optimal policy in most cases. Our numerical study also sheds light on the benefits of the dual freight model over the single freight models. © 2011 Wiley Periodicals, Inc. Naval Research Logistics, 2011     

基于聚类算法的多无人机系统任务分配

针对现有任务分配方法在任务点较多时不易解算,且计算量大的问题,提出了基于模糊C-均值聚类算法的多无人机系统任务分配方法.首先,利用模糊C-均值聚类算法得到的隶属度矩阵对任务点进行初始分配;其次,针对基于空间划分聚类可能造成各UAV任务不均衡的问题,设计任务的局部优化调整规则;最后,结合单旅行商问题,利用Tabu Sea...     

Quantifying the performance effects of idle time utilization in multiserver systems

In many practical multiserver queueing systems, servers not only serve randomly arriving customers but also work on the secondary jobs with infinite backlog during their idle time. In this paper, we propose a c‐server model with a two‐threshold policy, denoted by (e d), to evaluate the performance of this class of systems. With such a policy, when the number of idle servers has reached d (<c), then e (<d) idle agents will process secondary jobs. These e servers keep working on the secondary jobs until they find waiting customers exist in the system at a secondary job completion instant. Using the matrix analytic method, we obtain the stationary performance measures for evaluating different (e, d) policies. © 2006 Wiley Periodicals, Inc. Naval Research Logistics, 2007.     

一种不需要特征值分解的MUSIC方法

MUSIC方法是空间谱估计中经典的子空间方法。提出了一种构造参考信号的预处理模型,提出了一种适合于MUSIC方法的多级维纳滤波结构。新方法避免了采样数据二阶统计的特征值分解,降低了运算量。仿真结果证明了方法的有效性。     

机动目标跟踪误差CRLB计算与分析

克拉美-罗下限(CRLB)作为参数估计所能达到的最低误差限,常被用来衡量算法估计性能的优劣程度。以转弯机动为例,研究了有源(主动)和无源(被动)两种观测条件下目标跟踪CRLB计算的一般方法,并通过矩阵理论分析了目标机动可能引起的CRLB突变的原因,为机动目标跟踪的算法性能评估提供了有效手段。最后给出了仿真算例。     

始终处于大气层内飞行的TBM被动段弹道预测

对大气层内飞行的TBM弹道进行预测时,需要根据不同的应用要求,在求解精度允许范围内用近似方法对六自由度运动进行简化,获得简便实用的弹道预测方法。在假设获得TBM被动段弹道初始位置和速度参数的基础上,首先构建简便实用的处于大气层内飞行的TBM被动段抛物线弹道模型;然后将雷达测得的TBM被动段弹道初始位置和速度参数作为初始条件,对弹道方程采用精度较高的龙格-库塔法进行求解,相应得出被动段弹道上各点及落点的位置和速度参数,进一步确定出落点位置的地理位置经纬度。在某地空攻防对抗仿真项目中应用表明,弹道模型及其求解方法可应用于实战或较为逼真的仿真系统中。     

一种基于LMS的时域相干累积算法研究

为了克服低信噪比条件下传统的自适应滤波算法抑制高斯噪声效果差的缺点,提出了基于最小均方(LMS)的时域相干累积新算法。计算机仿真结果表明,该算法具有良好的抑制高斯噪声的性能,对于低信噪比下信号的增强效果明显优于传统的自适应滤波算法。