多智能体系统对移动放射性辐射源的环绕跟踪

针对多智能体系统对移动放射性辐射源的环绕跟踪问题进行了研究,利用一种全新的方法,证出多智能体系统在有限时间内对移动放射性辐射源群组进行环绕跟踪。通过设计三个不同的分布式估算器分别对辐射源的几何中心、环绕半径以及极角进行估计,最后将得到的估计值为环绕智能体设计分布式控制协议,使得智能体在有限时间内能够将所有辐射源包围在环绕圈内,并实现均匀分布。最后,通过MATLAB仿真验证了控制方案的有效性。     

Method of adaptive PLL bandwidth adjustment without phase slipping

In a system based on the phase lock loop（PLL）, a trade-off must be made between the tracking precision and the dynamic performance if constant parameters are adopted. To overcome this drawback, a new method called no phase slipping adaptive bandwidth（NPS-AB） is proposed, which can adjust the loop bandwidth adaptively for different working conditions. As a result, both the tracking precision and the dynamic performance can be achieved concurrently. NPS-AB has two features to keep the loop stable： one is the capability of quick response to dynamics; the other is a series of additional constraints when the bandwidth is switched. Compared with other methods, there is no phase slipping during the adjustment process for NPS-AB. The phase integer ambiguity can be avoided and the phase value is kept valid. It is meaningful for carrier ranging systems. Simulation results show that NPS-AB can deal with sudden dynamics and keep the pseudo-range value stable in the entire dynamic process.     

DGPS实时引导和跟踪系统

以对空目标寻的系统的外场试验为背景，介绍了一种采用差分GPS定位技术，结合计算机软件而设计的目标实时引导和跟踪系统，并给出了某试验系统的试验实测数据和结果分析。试验证明，该系统工作十分有效，而且使用方便，工作可靠，值得推广。     

松弛迭代粒子追踪测速法独立性改进

为了提高提取瞬态流场结构的便捷性,对松弛迭代粒子追踪测速法(RM-PTV)的独立性进行了改进.引入Delaunay三角剖分(DT)法代替固定阈值法来选取与目标粒子保持相似运动的参选粒子并对典型自定义流场进行了匹配计算,同时引入邻域窗口分析法对改进前后的流场在匹配结果中突兀矢量分布的数量和大小进行了比较.计算结果表明:DT方法可以有效选取目标的参选粒子,改进方法可以较好地保持抗噪音和识别粒子无匹配的能力,省去固定阈值的选取,减小对具体流场的依赖性;当噪音和粒子无匹配存在时,改进前后的流场在匹配结果中突兀矢量分布的数量和大小基本相同.最后,通过实验证明了改进方法在大气边界层内提取沙粒跃移运动轨迹上是有效的.     

Calculation of angular glint in near field utilizing graphical electromagnetic computing

The angular glint in the near field plays an important role on radar tracking errors. To predict it more efficiently for electrically large targets, a new method based on graphical electromagnetic computing （GRECO） is proposed. With the benefit of the graphic card, the GRECO prediction method is faster and more accurate than other methods. The proposed method at the first time considers the special case that the targets cannot be completely covered by radar beams, which makes the prediction of radar tracking errors more self-contained in practical circumstances. On the other hand, the process of the scattering center extraction is omitted, resulting in possible angular glint prediction in real time. Comparisons between the simulation results and the theoretical ones validate its correctness and value to academic research and engineering applications.     

C51环境下TLC2543的软件设计

本文介绍了在C51环境下采用C语言和汇编语言两种方式对AD转换芯片TLC2543进行编程的方法,两种方法均可以实现对外部模拟量数据的采集。     

Consecutive tracking for ballistic missile based on bearings-only during boost phase

This paper proposes a modified centralized shifted Rayleigh filter(MCSRF) algorithm for tracking boost phase of ballistic missile(BM) trajectory with a highly nonlinear dynamical model based on bearings-only.This paper contributes three folds.Firstly,the mathematical model of an MCSRF for multiple passive sensors is derived.Then,minimum entropy based onedimensional optimization search to adaptively adjust the probability of the different filters for real time state estimation is deployed.Finally,the unscented transform(UT) is introduced to resolve the asymmetric state estimation problem.Simulation results show that the proposed algorithm can consecutively track the BM precisely during the boost phase.In comparison with the unscented Kalman filter(UKF) algorithm,the proposed algorithm effectively reduces the tracking position and velocity root mean square(RMS) errors,which will make more sense for early precision interception.     

卫星和飞船测控站分布的优化模型

以2009年全国大学生数学建模竞赛C题为背景,运用解析几何与高等数学的方法,对神七飞行轨道为圆形轨道和椭圆轨道分别建立了理想数学模型.对于飞船的不同飞行高度与角度,给出了相应的全程测控所需的最少测控站的优化模型,最后对模型进行了评价.     

基于水平集方法的动态目标跟踪路径最优仿真

两移动平面运动体因有各自的智能控制器,因此当它们在跟踪控制时,双方必然及时根据对方的策略改变各自的控制策略(方向和速度大小),来达到一种真正的双边最优(主动跟踪者最短时间的追上被跟踪者,而被跟踪者最大化时间避免被追上).首先将平面上任意运动体简化成带速度和加速度的质点,然后利用追逃微分对策理论建立起此跟踪路径最优问题的哈密顿-雅可比-贝儿曼偏微分数学模型.对这种双边极值的难点问题,提出一种水平集数值求解方法.并利用水平集的偏微分方程与哈密顿-雅可比-贝儿曼偏微分方程结构相似性得到水平集的速度函数.对一平面上两无人驾驶飞机的动态跟踪双方进行仿真,仿真编程简单,解决了双边极值的求解.     

电视跟踪系统的专用处理机

本文讨论了用于实时电视跟踪系统的专用处理机设计方案,提出了微程序设计支持的、无机器级指令的、流水线状态结构的专用微型计算机设计思想.在设计中,以高速LSI位片式器件为基础,将微程序设计与流水线技术相结合,使处理机具有灵活、并行、高效率的特点.文中介绍了专用处理机的基本结构以及提高速度和效率的措施.