基于SCT-IMM的临近空间高超声速目标跟踪模型

针对传统单模型跟踪方法不能有效跟踪临近空间高超声速目标飞行全过程的问题,提出了一种基于SCT-IMM的跟踪模型.在分析临近空间高超声速目标特性的基础上,建立了一种基于一阶时间相关模型的转弯模型(Singer Coordinate Turn,SCT),结合EKF滤波方法,采用CV、CA和SCT模型进行IMM滤波计算.仿真结果表明,新模型计算量略大于单模型,但新模型能够适用于跟踪临近空间高超声速目标的所有飞行阶段,且位置均方根误差和速度均方根误差都小于单模型,具有一定工程实践意义.     

Theoretical investigation of synchronous totally asymmetric simple exclusion process on lattices with two consecutive junctions in multiple-input-multiple-output traffic system

In this paper, we study the dynamics of the synchronous totally asymmetric simple exclusion process (TASEP) on lattices with two consecutive junctions in a multiple-input-multiple-output (MIMO) traffic system, which consists of m sub-chains for the input and the output, respectively. In the middle of the system, there are N (nN synchronously increasing, the vertical phase boundary moves toward the right and the horizontal phase boundary moves toward the upside in the phase diagram. The boundary conditions of the system as well as the numbers of input and output determine the no-equilibrium stationary states, stationary-states phases, and phase boundaries. We use the results to compare with computer simulations and find that they are in very good agreement with each other.     

Zone inhomogeneity with the random asymmetric simple exclusion process in a one-lane system

In this paper we use theoretical analysis and extensive simulations to study zone inhomogeneity with the random asymmetric simple exclusion process (ASEP). In the inhomogeneous zone, the hopping probability is less than 1. Two typical lattice geometries are investigated here. In case A, the lattice includes two equal segments. The hopping probability in the left segment is equal to 1, and in the right segment it is equal to p, which is less than 1. In case B, there are three equal segments in the system; the hopping probabilities in the left and right segments are equal to 1, and in the middle segment it is equal to p, which is less than 1. Through theoretical analysis, we can discover the effect on these systems when p is changed.     

基于BP神经网络的小样本星图识别方法

为解决星敏感器的星图识别算法高实时性和鲁棒性,采用了BP神经网络;根据飞行轨迹精简了导航星及对应的模式,即一个视场中的一幅星图对应一个惟一的导航模式。采用二维Voronoi图计算向平面上最大空圆,构造了完备的圆视场集合;经过反复比较,选择以恒星为顶点能构造包含视场中所有星的凸多边形的导航模式,以其角距和顶角作为识别向量,具有平移和旋转不变性,并以该模式为BP神经网络的训练样本。仿真试验表明：该方法的识别成功率达100%,识别时间小于20ms。     

Theoretical investigation of total-asymmetric simple exclusion processes with attachment and detachment

In this paper, traffic systems with attachment and detachment have been studied by total-asymmetric simple exclusion processes (TASEPs). Attachment and detachment in a one-dimensional system is a type of complex geometry that is relevant to biological transport with the random update rule. The analytical results are presented and have shown good agreement with the extensive Monte Carlo computer simulations.     

高压并联电抗器铁芯夹件多点接地分析及处理

鉴于高压并联电抗器在远距离输电线路中的重要性,通过参照变压器铁芯夹件多点接地故障的处理经验,分析了故障产生的原因和处理方法,并介绍了一起500kV高压并联电抗器铁芯夹件多点接地故障处理过程。在故障初期采用在铁芯夹件接地回路串接限流电阻的措施是合理有效的,为现场处理高压并联电抗器铁芯夹件多点接地故障提供了参考。     

一种DPR中总线宏的设计方法

针对传统的实现FPGA局部动态可重构中总线宏的设计方法比较复杂的问题,提出了一种Virtex-5 FPGA局部动态重构中基于Slice的总线宏的简易设计方法。在介绍总线宏基本原理的基础上,分析传统设计方法的复杂性,结合Virtex-5芯片的结构特点,以Xilinx的ISE9.1i和PlanAhead9.2.7开发软件为依托,通过宏文件获取、模块例化和连线以及放置总线宏来实现总线宏的设计。实验和仿真结果表明,该方法简单易行、灵活性强,能够工程化应用于Virtex-5 FPGA的局部动态重构设计中。     

基于双视场弹载星敏感器的姿态测量及误差分析

姿态测量是导弹导航、制导系统的重要组成部分,为提高弹载星敏感器测量姿态的精度,提出了基于双视场星敏感器测量导弹姿态的方法.首先,由单个视场中的导航星求得每一个视轴的方位,然后通过双视轴矢量求得弹体在赤道惯性坐标系姿态,由发射点惯性系和赤道惯性系的关系,可得到导弹在发射点惯性系的姿态,并给出了具体数学表达式.最后,定量分析了双视场中星数目对姿态精度的影响,对合理采用姿态数据,提高测量精度有一定的指导意义.     

一种远程相控阵雷达单帧搜索参数优化方法

远程相控阵雷达担负目标搜索任务时,在一定检测概率下,特定波位的驻留时间与脉冲重复周期密切相关,如何优化设计脉冲重复周期值以节省时间资源,是一个值得研究的问题。针对远程相控阵雷达单帧搜索工作方式,提出了一种基于最小捕获时间的参数优化设计方法,并以探测临近空间高超声速目标为例,分析了捕获时间与脉冲重复周期之间的关系,给出了最优脉冲重复周期值的赋值区间。仿真结果表明,所提方法能有效节省雷达系统时间资源。     

Effect of unequal injection rates and different hopping rates on asymmetric exclusion processes with junction

In this paper, the effects of unequal injection rates and different hopping rates on the asymmetric simple exclusion process (ASEP) with a 2-input 1-output junction are studied by using a simple mean-field approach and extensive computer simulations. The steady-state particle currents, the density profiles, and the phase diagrams are obtained. It is shown that with unequal injection rates and different hopping rates, the phase diagram structure is qualitatively changed. The theoretical calculations are in good agreement with Monte Carlo simulations.