基于Matlab的AM通信系统仿真

分析当前通信类课程实验教学存在的问题,提出采用Matlab仿真来弥补实验室实验设备等的不足。利用Mat—lab的Simulink工具箱建立AM系统的两种仿真模型,包括基于相干解调和包络检波的AM仿真模型,详细叙述模块参数的设置,分析仿真结果,仿真结果与理论结果一致。创新之处在于AM系统的仿真采用两种方法,仿真模型简单,充分展示了Simulink工具箱仿真通信系统的基本方法,为通信系统的仿真研究指出了一个方法。     

带有死区功能的数字SPWM通用仿真模型研究

目前绝大多数的正弦脉宽调制（SPWM）波的仿真仍采用模拟方式实现。为了便于数字化控制系统中SPWM波的仿真,在此基于SPWM波的产生机理,在PSIM仿真环境下,结合VISUAL C＋＋开发了纯数字实现的SPWM波通用仿真模型。利用该模型,可以任意仿真不同载波频率,调制波频率,死区时间及调制比下的双极性SPWM波。最后,以全桥逆变电路中常见的死区效应分析为例,利用该模型搭建仿真电路进行了仿真分析。仿真结果表明了该模型的正确性和合理性。     

An Efficient Simulation Environment and Simulation Techniques for Bluetooth Device Design

Validation of an System-on-Chip (SoC) design with networking capability needs global simulation of the whole system including the network as well as the SoC design itself. Especially, it is needed to validate the interoperability of SoCs from different vendors. In this paper, we propose a simulation environment and simulation techniques for efficient validation of such SoC designs and apply them to networked Bluetooth SoC designs. The environment enables two types of simulation. One is modular enough to include the simulation of other vendors' Bluetooth devices and the other is optimized to achieve fast simulation in developing in-house Bluetooth devices. Especially, the former is scalable in that it keeps the constant simulation runtime despite the increase of the number of Bluetooth devices. Since multiple simulators are involved, the global simulation is still slow. Thus, the simulation efforts need to be minimized to shorten the design cycle. We present two simulation techniques, a concept called grouped message for reduction in simulation runtime and a system debug scenario called fix–modify–restart for reduction in the number of simulation runs. The former is to reduce inter-process communication overhead between simulators in the global simulation. The latter is to reduce repeated simulation runs in the conventional design cycle. Experimental results show the scalability of the presented simulation environment, reduction in simulation efforts by two simulation techniques.     

基于模型的雷达对抗仿真系统构建技术

随着仿真需求层次的不断提高,雷达对抗仿真系统涉及到的仿真模型越来越多。仿真模型库为模型重用提供了有效的管理平台,支撑了基于模型重用的仿真系统构建。结合导弹突防背景下的雷达对抗仿真系统,分析了仿真系统的总体方案,设计了仿真系统的模型结构,提出了基于模型的仿真系统构建方法。     

面源红外诱饵的干扰特性分析以及模拟研究

面源红外诱饵已经成为对抗红外成像制导导弹的一种有效手段,为了在半实物仿真中进行面源红外诱饵的模拟,本文首先分析了面源红外诱饵干扰的特殊性,然后以实战应用为依据,结合工程模拟要求进行简化,建立了面源红外诱饵模拟的模型,最后在一定的仿真条件设置下,进行了计算机红外图像的模拟生成。仿真结果表明,随着相互距离的变化,面源红外诱饵模拟图像的大小、亮度以及运动变化符合实际情况,具有一定的应用价值。     

A Hybrid Simulation Approach for Fast and Accurate Timing Analysis of Multi-Processor Platforms Considering Communication Resources Conflicts

In the early design phase of embedded systems, discrete-event simulation is extensively used to analyse time properties of hardware-software architectures. Improvement of simulation efficiency has become imperative for tackling the ever increasing complexity of multi-processor execution platforms. The fundamental limitation of current discrete-event simulators lies in the time-consuming context switching required in simulation of concurrent processes. In this paper, we present a new simulation approach that reduces the number of events managed by a simulator while preserving timing accuracy of hardware-software architecture models. The proposed simulation approach abstracts the simulated processes by an equivalent executable model which computes the synchronization instants with no involvement of the simulation kernel. To consider concurrent accesses to platform shared resources, a correction technique that adjusts the computed synchronization instants is proposed as well. The proposed simulation approach was experimentally validated with an industrial modeling and simulation framework and we estimated the potential benefits through various case studies. Compared to traditional lock-step simulation approaches, the proposed approach enables significant simulation speed-up with no loss of timing accuracy. A simulation speed-up by a factor of 14.5 was achieved with no loss of timing accuracy through experimentation with a system model made of 20 functions, two processors and shared communication resources. Application of the proposed approach to simulation of a communication receiver model led to a simulation speed-up by a factor of 4 with no loss of timing accuracy. The proposed simulation approach has potential to support automatic generation of efficient system models.     

GL Studio在飞机仪表板仿真中的应用

虚拟仿真技术广泛运用于飞行训练,仪表仿真成为飞机座舱仿真模拟的关键难题。利用GL Studio软件的图形设计器和代码生成器,结合VC＋＋6.0混合编程,实现对飞机座舱仪表板的仿真。在此介绍了GL Studio软件的特点及开发流程,详细介绍了飞机座舱仪表板建模和仿真过程,仪表的属性设置方法及编码实现仪表功能具体过程,并给出仿真结果。实践证明,GL Studio软件将使仪表板仿真更加高效真实美观。     

机载PD雷达信号处理系统建模与仿真

利用计算机仿真技术的可控制性、可重复性、安全性、经济性、无破坏性等特点与优势,在Simulink仿真环境下建立了三个不同中脉冲重复频率（MPRF）的机载PD雷达数字仿真系统,对机载PD雷达的信号处理系统进行了建模和系统仿真,给出了仿真的系统框图和仿真结果。最后的仿真结果证明了仿真的正确性。     

射频仿真系统三轴模拟转台动态误差分析

三轴模拟转台是进行飞行器飞行姿态地面半实物仿真系 统的重要 设备之一,其精度直接决定了仿真试验的置信度。通过分析转台动态响应能力并结合转台的 部分实测数据,求解了转台动态误差系数,得到转台动态误差的计算公式,最后用一个典型 仿真试验对三轴模拟转台动态误差进行计算分析。利用该动态误差计算公式得到的仿真结果 可以为射频仿真试验设计及精度分析提供参考。