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关键词： 单框架控制力矩陀螺   伺服系统   永磁同步电机   数学建模   滑模观测器   硬件设计  

摘要： 针对框架伺服系统中应用的传统机械式角度测量传感器存在增加系统尺寸、重量和成本以及安装传感器会引起系统误差和降低系统可靠性等问题,基于TMS320F28335主控制器和A3PE3000从控制器设计硬件电路进行电信号采集和运算,并提出滑模观测器进行角度估算以替代机械式传感器,角度估算依据硬件电路测得电机绕组中有关精确的电信号,采用建立滑模观测器和基于锁相环算法实现转子位置和速度估算。在Simulink中搭建仿真模型,仿真结果表明,通过滑模观测器估计得到的位置值和速度值在系统运行0.2 s后能够稳定的跟踪上实际值。

关键词： 视频编码   帧间预测   插值滤波   硬件实现  

摘要： 由视频编码联合组提出的新一代多媒体视频编码标准HEVC/H.265,相比之前的AVC/H.264视频标准,在同样的视频质量情况下,视频流的码率减少一半,但运算复杂度提高了2～3倍。HEVC的帧间预测运动估计部分复杂度很高,用软件实现难以满足实时性的要求,适合于用硬件平台实现。针对运动估计插值部分,提出了一种由可配置的水平滤波器和多路输出的竖直滤波器构成的插值电路架构,该电路便于硬件实现且硬件资源利用率和吞吐率比现有文献都高。该架构用Quartus II综合在Altera的StratixⅤ系列芯片上,该硬件架构最大工作频率可以达到420.71MHz,可支持4K视频的实时传输。

关键词： ZigBee通信技术   智能家居   硬件设计   软件设计  

摘要： 设计了基于ZigBee通信技术的智能家居系统,本系统突破了传统家居设备控制的单一化操作模式,实现全系统的一体化操作,有效提升了用户的居住体验。不仅操作简单灵活而且还具备智能控制功能。通过ZigBee通信技术构建Mesh-network网状网络使得各家居设备都得到信号的覆盖,保证了对温/湿度控制、灯光控制以及门窗开关控制。

关键词： 智能家居   STM32   音乐播放器控制  

摘要： 智能家居逐渐走入了人们的生活,它可以通过计算机技术、现代通信技术等为人们带来便捷、高效的生活,其中的家电控制模块尤为重要。设计采用STM32单片机作为主芯片,模拟对家电中的音响设备作出控制。用户可以在一定条件下可以控制音乐播放器的开始与停止,从而节约成本,提高生活的质量。

关键词： 电机控制器   硬件设计   电动汽车   异步   TMS320F28335   汽车用   信号调理电路   电机控制系统  

摘要： 以改制电动汽车为研究对象,完成7.5kW异步电机控制器设计。主控芯片使用TMS320F28335,对控制器的逆变电路、驱动电路、辅助电源、信号调理电路及通讯电路进行设计。引言:随着环境问题和能源危机日益突出,新能源汽车取代传统燃油汽车越来越成为现实,在各国政府的倡导和大力补贴下,电动汽车得到了快速推广。电动汽车的核心是电机控制器,它的性能直接影响车辆的可靠性和稳定性。本设计以DSP为控制核心,对异步电机控制系统进行了硬件设计。

关键词： 无线传感网   加速度   传感器   ZigBee技术  

摘要： 随着无线通信技术的发展,将无线传输技术和MEMS技术相结合,开发了一种无线加速度传感器具有广泛的应用价值。设计了一款基于CC2530的可用于工业、民用、军用等领域中对低速运动物体加速度进行测量的多用途低速通用无线加速度传感器。

关键词： Discrete Tchebichef transform   approximate computing   image compression   ASIC   FPGA  

摘要： Due to the intensive use of discrete transforms in image/video coding, the search for fast and power-efficient design approaches for their hardware implementation becomes essential. The Discrete Tchebichef Transform (DTT) represents a discrete class of the Chebyshev orthogonal polynomials, and it is an alternative for the Discrete Cosine Transform, commonly used in picture coding. The state-of-the-art approximate DTT matrix is composed of 0, 1, -1, 2, and -2 values. In this work, we propose a new approximation for the 8-point DTT, with a higher power-and compression-efficiency by exploring coefficient truncation, leading to the values 1/16, -1/16, 1/8, and -1/8. Considering operations with integers, the smaller magnitude of coefficients causes truncation in the internal transform calculations and leads to lower values for the non-diagonal residues, which reduces non-orthogonality. The results show that the proposed 8-point pruned approximate DTT hardwired ASIC solutions increase the maximum frequency up to 64%, minimize the circuit area up to 43.6%, and saves up to 65.4% in power dissipation. The results of our DTT approximation proposal mapped for FPGA show an increase of up to 58.9% on maximum frequency, and savings of about 28.7% and 32.2% on slices and dynamic power, respectively, when compared with the literature. Our approximate DTT proposal also achieves higher compression ratio and less quality loss in the compressed image, when compared to state-of-the-art approximate DTT hardware designs.

关键词： Multi-standard interpolator   Motion compensation   Fractional motion estimation   Video coding   Hardware design  

摘要： Real-time operation and low-power dissipation in video coding systems have become important research challenges, especially in mobile devices with limited battery and computational resources. Given the variety of applications able to manipulate videos and the growing number of video coding standards, current devices are expected to provide native support to multiple coding standards. Although state-of-the-art coding requires a wide set of tools focusing on coding efficiency, major tools are usually present in different standards with limited differences. Therefore, implementing dedicated architectures for each standard tool is an inefficient approach at both development time and silicon area. Fractional Motion Estimation (FME) and Motion Compensation (MC) are among the most computation-intensive tasks within video codecs and are used in all major video coding standards. Thus, this paper presents a multi-standard sample interpolator hardware design for the MC and FME with full support to MPEG-2, MPEG-4, H.264/AVC, HEVC, AVS, and AVS2. The proposed design is capable of UHD 8K (Ultra High Definition -4320p@60fps) real-time interpolation when synthesized using a 45nm standard-cell library. The circuit footprint occupies 65,508 mu m(2) and the power dissipation ranges from 14.58 to 65.316mW for MPEG-2 and AVS2 operation modes, respectively.

关键词： 植保无人机   加固电子设备   硬件设计  

摘要： 伴随着我国科学技术应用水平的不断提升,无人机的研制正处于高速发展阶段。无人机的研制,具有成本低、环境适应能力强的优势,无论是民用还是军用,无人机都具有很大的优势,特别是在植保上的应用更是当前无人机发展中的重中之重。鉴于此,文中围绕大疆M600型号无人机机载加固电子设备整体结构进行设计,通过pro/E软件建立机载加固电子设备结构系统的三维结构图,然后再转化为二维图进行标注、加工,最后装配到无人机本体上,以此来完成植保无人机超低空飞行自动控制的研究。植保无人机机载加固电子设备整体结构系统设计使得植保无人机超低空飞行自动控制更加的稳定、高效。