基于Matlab的“自动控制原理”课程辅助教学探讨

针对“自动控制原理”课程传统教学中存在的概念抽象、理解困难等情况,借助Matlab强大的运算能力和数据可视化功能,结合教学过程中的重点难点,搭建“自动控制原理”仿真实验平台.该平台利用Matlab工具对抽象的理论教学进行演示,有效地提高了教学的针对性和直观性,对“自动控制原理”课程教学改革具有良好的借鉴意义.     

基于制导与控制系统的导弹虚拟仿真实验分析

阐述制导与控制系统课程的教学与仿真实验，包括自动控制原理、飞行动力学、制导与控制系统基本原理和设计方法，探讨理论知识与实践创新融合，构建制导与控制系统课程的导弹虚拟仿真实验开发平台架构，形成课程实践、实验环境与课程理论相结合的教学模式。     

面向自动控制原理课程教学的仿真软件开发

“自动控制原理”课程内容抽象，教学难度大。为提高教学质量，开发了面向“自动控制原理”课程教学的仿真软件。基于Matlab GUI开发平台，通过编写算法实现了控制系统的时域、根轨迹和频率响应分析等典型功能，开发了典型工程控制案例“直流调速系统”，通过可视化界面帮助学生理解经典控制理论在实际工程中的应用。该仿真软件使复杂的理论教学变得简单、直观，极大提高了课堂教学效率与教学质量。     

基于MATLAB的自动控制原理虚拟实验平台

本文搭建了基于MATLAB的“自动控制原理”虚拟实验平台,利用MATLAB中的SIMULINK仿真软件包的强大功能设计实验模型,不仅拓宽了学生的创新思维,而且保证了在应急情况下的实验。     

差分多普勒定位技术的仿真研究

为了研究多个运动平台对固定辐射源的差分多普勒(FDOA)定位,根据FDOA定位原理在"XX系统仿真"平台下建立了平面三站FDOA定位系统仿真模型.首先介绍了定位系统的每个子模块的功能和相应的数学模型;然后对定位误差的Cramer-Rao界进行了公式推导;通过仿真实验考察配置方式、运动方向以及取样数等参数对FDOA定位精度的影响.仿真结果表明所建立的仿真模型是可行而有效的.     

用EWB进行自动控制原理实验的探索

将虚拟电子平台软件EWB用于自动控制原理实验，补充了其它几种实验方法的不足，既实用、灵活又简单直观，使自控原理实验的质和量都得到了很大提高，用EWB模拟的自动控制实验系统、所用的信号源以及各种测试仪器都与现场实物相仿，但功能更强，使用更方便。     

Simulink仿真软件在自动控制原理教学中的应用

首先简单介绍了自动控制原理传统的实验方法，并对Matlab和Simulink做了概括介绍。结合实例详细阐述Matlab软件的Simulink模块组合仿真方法在自动控制原理实验中的应用方法，并给出了一个在自动控制原理中的应用实例。实验结果证明该方法大大提高了实验效率、改善了实验效果；既调动了学生的积极性和创造性，又培养了学生的分析、设计和调试自动控制系统的能力；解决了现阶段各高校学生人数多、仪器少之间的矛盾。     

船载无线激光通信系统模拟运动平台的研制

无线激光通信具有通信容量大、数据传输速率高、抗电磁干扰能力强、保密性高、功率消耗小、结构轻巧等主要优点,是未来船舶间通信的发展趋势.研究了船载无线激光通信系统中的模拟运动平台.该运动平台主要由水平移动台、垂直升降台、旋转台和摆动台四部分组成,分别模拟船舶在海浪中的四种摇荡运动:纵荡、垂荡、首摇和横摇.本文根据船舶运动方程,采用线性系统理论分析船舶在海浪中的摇荡运动规律,由海浪谱得到船舶摇荡运动谱,进而得到船舶摇荡运动方程.通过这四种运动合成出船舶在海浪中复杂的运动状态,从而在实验室条件下模拟出船舶在各种不同海况中的运动情况,为研究船载激光通信系统提供仿真实验环境.对该运动平台的操纵控制由计算机实现.     

基于MATLAB的通信原理实验设计和仿真

提出一种基于MATLAB系统仿真平台的通信原理实验设计与仿真,以实例验证通信原理的理论知识.MATLAB是集数值计算、图形绘制、图像处理及系统仿真等强大功能于一体的科学计算语言.将MATLAB的图形绘制和系统仿真等功能应用于通信原理实验仿真中,通过自己创建的系统来进行实验更能使学生深入理解通信系统工作原理.     

运动目标激光主动成像系统MTF建模仿真

根据激光主动成像系统的成像原理和线性系统理论,在光电成像系统通用MTF模型的基础上,考虑了大气湍流和运动对系统成像性能的影响,建立了针对运动目标的激光主动成像系统MTF模型,并利用Matlab进行了仿真研究。结合具体的仿真结果,分析了限制系统MTF的主要因素以及目标运动的影响,为后续进行系统性能的评估和优化奠定了理论基础。     

Position domain contour control for multi-DOF robotic system

Contour tracking control is one of the fundamental operations for robotic systems. In this paper, a position domain PD control is developed to control a multi-DOF nonlinear robotic system for improving contour tracking performance. In this new position domain control system, a robotic system is viewed as a master–slave system where the master motion is used as an independent reference through equidistantly sampling, while slave motions are described as functions of the master motion according to contour tracking requirements. A position domain dynamic model of the robotic system based on the master motion is developed through one-to-one mapping of the original dynamic model from time domain to position domain. Stability analysis is conducted for the proposed position domain PD control, the global boundedness of the tracking errors is guaranteed through the Lyapunov method, and the effectiveness is successfully verified through simulation study for linear and nonlinear contour tracking problems. Compared results demonstrate that the position domain PD control is better than its time domain counterpart for contour tracking of multi-DOF robotic systems.     

曲线机动情况下水下自主平台的改进被动合成孔径算法研究

水下自主无人平台(AUV)在曲线机动情况下利用传统ETAM方法扩展孔径时,目标方位估计结果无法聚焦到真实方位,估计偏差严重,针对这一问题,该文结合运动补偿提出一种新的ETAM算法。该算法将波束域与阵元域结合处理,在波束域获取相位信息,在阵元域对相位信息进行线性拟合,有效克服曲线运动造成的相位误差,得到相位修正因子后对连续测量进行相位补偿,实现孔径扩展。仿真和试验结果表明,无论平台直线航行还是曲线机动,该算法在对比算法失效的情况下,仍具有很高的测向精度、角度分辨率及空间增益,且适用于多目标的分辨,在较低信噪比下对性能的改善更为明显,有较强的实用性和环境宽容性。     

On water-filling precoding for coded single-carrier systems

We study the spectrum shaping gain in single carrier systems through water-filling precoding. We show that water-filling precoding outperforms other existing alternatives when iterative linear minimum mean square error (LMMSE) detection is involved, which is confirmed by both evolution analysis and simulation results. This technique does not incur any extra receiver cost when it is used together with frequency domain equalization (FDE).     

A Fully Complex-Valued Gradient Neural Network for Rapidly Computing Complex-Valued Linear Matrix Equations

This paper concerns online solution of complex-valued linear matrix equations in the complex domain. Differing from the real-valued neural network, which is only designed for solving real-valued linear matrix equations in the real domain, a fully complex-valued Gradient neural network (GNN) is developed for computing complex-valued linear matrix equations. The fully complex-valued GNN model has the merit of reducing the unnecessary complexities in theoretical analysis and realtime computation, as compared to the real-valued neural network. Besides, the convergence analysis of the proposed complex-valued GNN model is presented, and simulation experiments are performed to substantiate the effectiveness and superiority of the proposed complex-valued GNN model for online computing the complex-valued linear matrix equations in the complex domain.     

二维随机粗糙面的fBm模拟及其统计特性

数值模拟在物理建模中具有相当重要的地位。本文基于对二维分形布朗运动（ｆＢｍ）的研究，根据ｆＢｍ的特征，阐述了用二维ｆＢｍ函数模拟随机粗糙面的方法。由于很多电磁散射问题与粗糙面的各阶矩有很大的关系，我们导出了二维随机粗糙面的统计参量与分维Ｄ的关系。基于对二维ｆＢｍ的小波分析，提出了在时－频相空间估计分维Ｄ的方法。这种方法比较简单而切实可行，不但适合于粗糙面整体分维的计算，更适合于局部分数维的计算。所     

Modeling and analysis of a 3-DOF Lorentz-force-driven planar motion stage for nanopositioning

This paper presents an approach to dynamic modeling and analysis of a 3-DOF Lorentz-force-driven planar motion stage for nanopositioning. The planar motion stage consists of a long stroke motor, a short stroke motor and a positioning platen. The long stroke motor is a linear motor, and the short stroke motor is a planar motor propelled by linear Lorentz forces and floated with high-stiffness air-bearings. The Lorentz-force-driven planar motion stage is regarded as two rigid bodies which are modeled by the Newtonian approach independently, then the relations of Lorentz forces with electric currents, magnetic fields, and displacements are obtained through electromagnetic analysis of the short stroke motor using 3-dimension finite element method. The frequency response functions of the planar motion stage in the moving directions are obtained by numerical simulation, which are in good agreement with those obtained experimentally. The positioning accuracy of the planar motion stage is also evaluated numerically and experimentally.     

Non‐linear chirp based UWB waveform design for suppression of NBI

In order to alleviate the narrowband interference (NBI) to ultra wideband (UWB) systems, we propose two non‐linear UWB chirp waveforms based on the arctrigonometric and archyperbolic function in this paper. The proposed UWB pulses can obtain good performance in NBI suppression. Both of the two chirp pulses require only the time domain processing because of the inherent relationship between the frequency domain and the time domain. Theoretical analysis and simulation results show that the direct sequence pulse binary amplitude modulation (DS‐BPAM) UWB systems with the proposed chirp waveforms can achieve excellent NBI suppression performance and outperform the linear chirp waveform based UWB system significantly. Copyright © 2010 John Wiley & Sons, Ltd.     

Algebraic tools for the performance evaluation of discrete eventsystems

It is shown that a certain class of Petri nets called event graphs can be represented as linear time-invariant finite-dimensional systems using some particular algebras. This sets the ground on which a theory of these systems can be developed in a manner which is very analogous to that of conventional linear system theory. Some preliminary basic developments in that direction are shown. Several ways in which one can consider event graphs as linear systems are described. These correspond to approaches in the time domain, in the event domain, and in a two-dimensional domain. In each of these approaches, a different algebra has to be used for models to remain linear, but the common feature of these algebras is that they all fall into the axiomatic definition of `dioids'. A unified presentation of basic algebraic results on dioids is provided     

地面国标单载波系统频域均衡改进算法

在地面数字电视中国国家标准(DTMB)的单载波模式(C=1)下,时域均衡复杂度高,时延大。在研究单载波系统特殊的帧结构及高斯白噪声功率估计方法的前提下,提出一种改进的频域均衡算法,它是基于最小均方误差线性均衡(MMSE)准则设计的,并把下一帧的帧头等效为本帧的循环后缀与本帧帧体一起处理,构成类似于CP-OFDM的信号格式。理论分析和仿真结果表明,该算法运算量更小,均衡性能更好。