CAN控制器状态机的分析与实现

CAN状态机包含：总线脱离、总线启动、总线空闲、模式选择、发送模式、接收模式、错误模式、间歇模式、超载模式及挂起模式等状态。CAN状态机的状态编码采用一种类似One-Hot的编码方式。其只有外部硬件复位采用异步方式,其余信号均用全局时钟进行同步。把状态机逻辑和算术逻辑及数据通道分开,把状态机纯粹当作控制逻辑电路来使用,从而改善其性能。     

基于TinyOS的装备温度检测系统

运用无线传感网络技术构建小型无线传感网络,并以基于嵌入式系统TinyOS的结构化编程语言nesC编制系统软件,实现对装备中多个运行部件的无线实时温度检测。其软件含两个模块,分别用于温度采集和无线传送,以及实现无线传送的中继功能。在完成系统各模块间相互关系安排后,还需对系统各模块进行nesC编程。仿真实验证明该系统运行有效可靠。     

基于改进遗传算法的SAR 末制导段弹道优化设计

应用改进实数编码遗传算法,对基于弹载合成孔径雷达(synthetic aperture radar,SAR)导引头的反舰导弹末制导段的弹道优化设计进行研究。分析飞行弹道和观测视角对弹载SAR导引头方位分辨力的影响,给出弹载SAR成像对导弹飞行弹道的约束,将导弹横向加速度作为优化变量,构建与方位分辨率和波束驻留时间相关的目标函数。仿真结果表明:与标准遗传算法优化相比,改进遗传算法优化后的目标函数值减小更快,能更快得到最优解。     

小波神经网络在陀螺漂移预测中的应用

针对传统预测方法存在的不足,建立一种基于小波神经网络的陀螺漂移预测模型。重点研究利用小波分析理论对陀螺输出信号的漂移趋势识别提取方法,结合小波神经网络建立漂移信号的非线性预测模型,并以某陀螺实测信号为例预测其漂移趋势。结果表明:该模型能降低人为因素影响,提高漂移预报效果和导航系统精度。     

1bit脉冲超宽带接收机采样抖动性能分析方法简

A novel method based on the Central Limit Theorem (CLT) is proposed to analyze the performance of the 1bit Impulse-Radio Ultra-WideBand(IR-UWB) receiver in the presence of a timing jitter. First, the sampled signal with timing jitter is expressed as a linear function of the sampled signal without jitter and timing jitter through first-order Taylor series expansion. Then by the CLT, the decision variable of the 1bit receiver is considered as Gaussian distributed and the bit error rate (BER) is derived. After that, an upper bound of the averaged BER is also provided based on the distribution of random timing jitter. The given analytical result is the first analytic expression of the BER performance of the 1bit receiver with timing jitter and can be used for the case where the 1bit receiver has a linear interference. Experimental results show that the proposed upper bound agrees with the actual performance of the 1bit receiver very well and can be used for both Gaussian distributed and uniform distributed timing jitter.     

阿达玛变换近红外光谱仪

本文总结了近红外光谱仪已有各种分光技术的优缺点,介绍了阿达玛变换分光技术的基本原理,并对HT100阿达玛变换近红外光谱仪的系统结构、组成和仪器技术指标进行了介绍,利用HT100型阿达玛变换近红外光谱仪对汽油研究法辛烷值进行了实证预测研究,研究表明预测结果满足国家标准方法的要求。阿达玛变换近红外光谱仪有望成为下一代便携式近红外光谱仪。     

CSCW委托授权模型的可视化建模

CSCW系统中用户和访问对象的数量逐渐增多,使得系统的管理工作日益繁重。委托授权机制能较好地解决CSCW中授权管理复杂的问题。为了有利于原型系统或实际应用系统的设计和开发,在面向CSCW基于角色一活动的委托模型RABDM for CSCW（Role-Activity Based Delegation Model for CSCWWJ基础上,利用统一建模语言UML（Unified Modeling Language）对其进行面向对象的可视化静态建模和动态建模。     

Performance analysis of MIMO DUCA multiple antenna system

A MIMO multi-antenna system of compact double uniform circular array (DUCA) in three dimensional direc-tional frequency non-selective Rayleigh fading channel was analyzed and investigated. Equivalent network model of MIMO multi-antenna array considering MC effect was established, general expressions of correlations were derived and the relationship between correlations with and without MC was classfied. Then, the results were compared with general uniform linear array (ULA) and uniform circular array (UCA). It was concluded that the deployment of antennas plays a decisive role in correlations between antennas. The research has a good sense on designation of spatial massive MIMO multi-antenna array and system optimization.     

Adaptive computational resource allocation for sensor networks

To efficiently utilize the limited computational resource in real-time sensor networks, this paper focuses on the challenge of computational resource allocation in sensor networks and provides a solution with the method of economics. It designs a microeconomic system in which the applications distribute their computational resource consumption across sensor networks by virtue of mobile agent. Further, it proposes the market-based computational resource allocation policy named MCRA which satisfies the uniform consumption of computational energy in network and the optimal division of the single computational capacity for multiple tasks. The simulation in the scenario of target tracing demonstrates that MCRA realizes an efficient allocation of computational resources according to the priority of tasks, achieves the superior allocation performance and equilibrium performance compared to traditional allocation policies, and ultimately prolongs the system lifetime.