基于uClinux的嵌入式系统在通信用高频开关组合电源监控中的应用

uClinux操作系统和ARM微处理器的结合是工业控制领域的有效方案,该方案实现了对通信高频开关组合电源的监控,不仅使嵌入式电源监控系统具有丰富的网络功能、灵活的软硬件扩展性能,而且使通信电源具有良好通用性、稳定性和可靠性。     

基于LPC2378的天调匹配性能检测仪的设计及实现

为了解决生产中短波天调配谐过程存在的劳动强度大,统计不够准确等问题,设计了一种检测仪。该检测仪以嵌入式技术为基础,利用短波电台所提供的遥控命令,实现短波天调自动配谐功能,并根据统计得到的配谐数据判断天调匹配性能是否合格。经生产验证,该测试仪在提高劳动效率的同时,还能减少人工统计数据可能带来的误差。     

多层PCB中内埋电阻的特性分析及应用

计算、分析了多层PCB内埋平面电阻的特性，并将其应用于一种多层射频板威尔金森功分器的设计，研究并分析了平面电阻尺寸对该功分器射频性能的影响。     

“高频电子线路”理论课内嵌实验的探讨

国内大学的工程实践性课程通常理论课和实验课分开讲授，时间跨度大，内容不匹配，难以达到互相推动、互相促进的理想效果。在理论课讲授过程中同步内嵌实验课是一种无需变动复杂的课程体系，而能显著改善教学效果的方法。本文以“高频电子线路”课程的教学实践为例，探讨了此类改革面临的挑战和应对方法。     

Self-reconfiguration of real-time communication in cyber-physical systems

Today, in domains like automation and robotics systems consist of various sensors and computation nodes. Due to the temporal dependency in quality of measured data, such Cyber-Physical Systems (CPS) commonly have real-time requirements on communication. In addition, these systems shall become more flexible and scalable, e.g., by adding new components to the CPS. This would be most suitable if a CPS could react to the presence of a new component and reconfigure itself to run afterward with the new component integrated to the CPS. This capability is covered by the term Plug-and-Produce. In this paper, we propose a concept to enable Plug-and-Produce within a CPS whose network uses different communication media, e.g., Ethernet and CAN. To enable real-time communication provided by different communication protocols, their different synchronization mechanisms have to be combined to get a common time base within the entire system. For this purpose, we consider Ethernet as well as CAN-based real-time communication protocols and their synchronization mechanisms. The proposed concept for self-reconfiguration aims to be integrated into our three layered software architecture that is presented as well.     

iCETD: An improved tag generation design for memory data authentication in embedded processor systems

Security becomes increasingly important in computing systems. Data integrity is of utmost importance. One way to protect data integrity is attaching an identifying tag to individual data. The authenticity of the data can then be checked against its tag. If the data is altered by the adversary, the related tag becomes invalid and the attack will be detected. The work presented in this paper studies an existing tag design (CETD) for authenticating memory data in embedded processor systems, where data that are stored in the memory or transferred over the bus can be tampered. Compared to other designs, this design offers the flexibility of trading-off between the implementation cost and tag size (hence the level of security); the design is cost effective and can counter the data integrity attack with random values (namely the fake values used to replace the valid data in the attack are random). However, we find that the design is vulnerable when the fake data is not randomly selected. For some data, their tags are not distributed over the full tag value space but rather limited to a much reduced set of values. When those values were chosen as the fake value, the data alteration would likely go undetected. In this article, we analytically investigate this problem and propose a low cost enhancement to ensure the full-range distribution of tag values for each data, hence effectively removing the vulnerability of the original design.     

一种双路图像融合实时处理系统的设计

提出了一种关于双路图像融合实时处理系统的设计,介绍了融合处理系统的总体架构和系统的功能。对系统的硬件设计和软件设计分别进行了说明,硬件设计对电源设计、采集模块设计和处理模块设计进行了详细阐述;软件部分细致分析了现场可编程门阵列(FPGA)的设计和数字信号处理器(DSP)的设计。最后对处理系统进行了测试,表明该设计满足实时处理的需求。同时,可对系统进行扩展,实现更多路图像的融合处理。     

基于ARM和μC/OS-Ⅱ的车载定位终端的设计

针对当前车载定位终端数据交互实时性差以及程序运行不稳定的问题提出了一种基于ARM处理器和uC/OS-Ⅱ操作系统的车载定位终端的设计方案.在32位高速ARM处理器上移植并应用基于优先级的抢占式实时多任务嵌入式操作系统μC/OS-Ⅱ以实现数据交互的高实时性和运行的可靠性,满足车载定位终端对数据处理速度以及可靠性的要求.     

基于跨度和虚拟层的三维芯核测试外壳扫描链优化方法

为减少三维芯核绑定前和绑定后的测试时间,降低测试成本,提出了基于跨度和虚拟层的三维芯核测试外壳扫描链优化方法.所提方法首先通过最大化每条测试外壳扫描链的跨度,使得绑定前高层电路和低层电路的测试外壳扫描链数量尽可能相等.然后,在TSVs(Through Silicon Vias)数量的约束下,逐层的将虚拟层中的扫描元素分配到测试外壳扫描链中,以平衡绑定前后各条测试外壳扫描链的长度.实验结果表明,所提方法有效地减少了三维芯核绑定前后测试的总时间和硬件开销.     

对嵌入式软件开发原则与模式研究

伴随着持续发展的科学技术水平,人们更高要求软件,针对当前逐步增长的产品研发要求,以往传统软件开发方式难以满足,在此背景下,亟待开发出适应现代生活的嵌入式软件,更多的人将其目光放在开发嵌入式软件方法,以便可以将开发软件效率提升,确保开发质量,开发嵌入式软件,必须将其出发点放在客观实际,将已开发当成中心,着力需求嵌入式软件开发原则与模式。