一种基于FPGA的旋转件非接触双向红外信号传输系统的实现

本文详细介绍了一种旋转件上非接触红外信号双向传输系统的实现方案。它通过在FPGA内部综合出快速的数字同步接收电路来实现对FIR红外传输数据稳定、可靠地接收和缓存,并将数据通过固定侧的PCI接口传输给应用程序,完成对旋转件上待测量的采集和分析。根据分析结果,也可以由应用程序发出相应操作命令和数据,对旋转件上的激励元件进行反馈控制。该方案在旋翼静态条件下进行了试验,结果表明,信号传输可靠,误码率极低。     

基于AD2S82A的轴角信号处理和传输

提出了一种基于AD2S82A、单片机和旋转变压器的测角电路设计方案,通过单片机来控制信号的处理和传输.利用轴角数字转换芯片AD2S82A和旋转变压器,可以组成高精度的多通道测角系统,可以对两个轴进行高精度的动态测量,因此能同时把旋转变压器粗精通道的模拟信号转化为数字信号.该设计为完成数字信号处理和传输的目的,采用单片机来控制信号的采集并通过串口将数字信号依次发出.为AD2S82A控制信号的传输研究提供了理论探索.经试验测试,该方法可行.     

基于自适应RBFNN噪声估计的自抗扰控制在姿态控制中的应用

针对旋翼飞行多关节机械臂内部参数不确定性、外部环境和自身机械臂规划运动对飞行平台的干扰问题设计了一种姿态控制方法.首先将跟踪微分器作为期望姿态角的过渡过程,利用自适应RBFNN(径向基函数神经网络)算法对旋翼飞行多关节机械臂内、外部干扰进行逼近估计并实时补偿.然后采用非线性状态误差反馈控制来实现旋翼飞行多关节机械臂的姿态跟踪控制,并利用李亚普诺夫函数进行稳定性分析.最后,在仿真平台上实现该算法,将其仿真结果分别与PID(比例-积分-微分)控制、传统自抗扰控制(ARDC)进行比较分析.并且在实际旋翼飞行多关节机械臂系统上进行了实验,在0.4 s之内三轴姿态角可从0快速跟踪到0.6 rad且无超调.该算法对各通道的扰动有较强的抗干扰性,对系统参数有较强的鲁棒性,并且明显优于ARDC和PID算法.结果说明该算法能有效地解决系统不确定性干扰问题以实现姿态角的准确、快速跟踪.     

基于FPGA的电机动态扭矩测量方法研究

为了提高光电式扭矩测量系统的灵敏度和系统的抗干扰的能力,设计了一种基于现场可编程门阵列(FPGA)和多路状态比较的扭矩测量系统,利用光电式多码道编码盘的旋转角测量功能进行扭矩测量.介绍了多码道码盘输出的多路信号的特征和状态细分的方法,并分析了扭矩测量的原理.硬件上采用FPGA来实现逻辑控制和数据的计数、锁存,简化了系统电路.并且把计数和状态信号传输到上位机进行处理显示,以便实时分析扭矩信号的振动.试验结果验证了该方案可应用于大型机械的动态扭矩测量系统.     

基于远程操作的多路信号采集与开关控制系统设计

针对航天器地面集成实验系统设计中的实际需要,提出了一种多路信号采集和开关控制系统;详细介绍了多路(模拟和数字)信号采集的硬件设计,信号在传输中的开关控制和通道选择设计,主要针对多路CAN总线信号和多路模拟信号、实现信号的采集及开关控制;系统包括AVR单片机、多路模拟开关、AD转换器、CAN总线收发器、继电器、掉电数据保存单元等,通过串口完成单片机与计算机间异步串行通信功能,实现远程操作.最后通过Proteus仿真,结果表明该设计能够有效满足实际系统要求.     

面向旋转构件的高速无线数据采集系统

提出一种基于80C51F021单片机和nRF2401无线数据传输芯片的旋转构件高速无线数据采集系统,系统包括采样端和接收端。采样端固定在旋转构件上,将传感器输出信号进行信号调理和模数转换,并利用无线数字传输技术将数据发送到接收端;接收端将采集数据中继传输到PC计算机进行显示和存储。实验结果表明:该系统采样速率高、数据传输可靠,适用于旋转构件的传感器信号采集。     

二维隐Markov模型的故障诊断方法

二维隐Markov模型(2D-HMM)具有强大的时序模式分类能力,特别适合于分析非平稳、重复再现性不佳的信号。鉴于旋转机械工作过程中存在大量的非平稳信号,将2D-HMM引入到旋转机械故障诊断中,提出了一种基于2D-HMM的故障诊断方法,并通过Bently-Nevada转子试验系统验证该方法的有效性。     

基于FPGA的多路信号智能集成测控系统设计

设计了一种基于FPGA的多路信号智能集成测控系统电路,其系统电路采用模块化设计,包括电源模块、多通道模块、信号隔离模块、ADC模块、FPGA主控模块、通信模块和电平转换模块等。所设计的电路将多路信号检测系统和多路信号控制系统集成在一起,解决了一些需要检测和控制联合应用的案例,且设备操作简单,系统应用广泛,尤其适合于汽车信号控制及检测等情形。通过对该电路进行仿真和实际电路的测试,达到了对多路信号智能检测和控制的目的。     

基于DSP处理系统的多路数据传输方法与实现

提出了一种EDMA多通道传输链乒乓结构的多路数据传输方法,介绍了EDMA3控制器的控制原理,论述了该方法的实现过程,并在基于TMS320C6455的图像处理系统中实现了3路数据的同步传输。实验与分析结果表明,相对于多个通道分别传输的方法,该方法传输效率提高了18%,CPU资源节省率达到66%,而且数据传输更稳定可靠。     

双发并收的高可靠性SDH传输方式

本文提出了一种双发并收的高可靠性SDH传输方式。该方式通过对电力生产实时信号的双发并收,使信号在多条独立的2M通道上并行传输。当部分通道出现误码越限或中断时,信号仍可通过余下的通道传输,而不需要在SDH设备进行通道倒换。双发并收消除了通道倒换的影响,降低了传输的误码率,提高了信号的传输可靠性。     

一种基于FPGA的旋转机械非接触双向红外信号传输系统的实现

详细介绍了一种旋转机械上非接触红外信号双向传输系统的实现方案.它通过在FPGA内部综合出快速的数字同步接收电路来实现对FIR红外传输数据稳定、可靠地接收和缓存,并将数据通过固定侧的PCI接口传输给应用程序,完成对旋转件上待测量的采集和分析.根据分析结果,也可以由应用程序发出相应操作命令和数据,对旋转件上的激励元件进行反...     

基于HOLTEK MCU的智能型电源线资料传输系统

所提出的智能型电源线资料传输系统,是以电源线作为信号传输的系统,以HOLTEK MCU单片机作为控制单元,控制载波及信号的频率,以变化的载波及信号的频率先传送的测试信号,后再由收到的信号品质评估最佳的载波及信号的频率,以此频率传送的摇手信号,待另一电路回应信号后,便以此频率传送及接收资料。     

Problem of reconstructing input signals under communication constraints

For a linear controllable system, the problem of reconstruction of all input signals, which are compatible with the measured signal, is considered. It is assumed that information can be transmitted in a processing center only via digital communication channel at discrete time instants, and the word length is limited. In this connection, there are encoding and decoding devices in the communication channel. For simplicity, the communication channel is assumed to be noiseless and delay-free. Defining relationships are obtained for the set of compatible input signals, as well as relationships between reconstruction precision, length of transmitted word and transmission frequency.     

Analysis of low power wireless links in smart grid environments

Recently, wireless sensor networks (WSNs) have been used in various smart grid applications, including remote power system monitoring and control, power fraud detection, wireless automatic metering, fault diagnostics, demand response, outage detection, overhead transmission line monitoring, load control, and distribution automation. However, harsh smart grid environment propagation characteristics cause great challenges in the reliability of WSN communications in smart grid applications. To this end, the analysis of wireless link reliability and channel characterizations can help network designers to foresee the performance of the deployed WSN for specific smart grid propagation environments, and guide the network engineers to make design decisions for the channel modulation, encoding schemes, output power, and frequency band. This paper presents a detailed analysis of low power wireless link reliability in different smart grid environments, such as 500 kV outdoor substation environment, indoor main power control room, and underground network transformer vaults. Specifically, the proposed analysis aims to evaluate the impact of different sensor radio parameters, such as modulation, encoding, transmission power, packet size, as well as the channel propagation characteristics of different smart grid propagation environments on the performance of the deployed sensor network in smart grid. Overall, the main objective of this paper is to help network designers quantifying the impact of the smart grid propagation environment and sensor radio characteristics on low power wireless link reliability in harsh smart grid environments.     

Observer-based tracking controller design for networked predictive control systems with uncertain Markov delays

This paper is concerned with a tracking controller design problem for discrete-time networked predictive control systems. The control law used here is a combined state-feedback control and integral control. Since not all the states are available in practice, a local Luenberger observer is utilised to estimate the state vector. The measured output and estimated state vector are packed together and transmitted to the tracking controller via a communication channel with a limited capacity. Meanwhile, the control signal is also transmitted through a communication network.Network-induced delays on both links are considered for the signal transmission and modelled by Markov chains. Moreover, it is assumed that the elements in Markov transition matrices are subject to uncertainties. In order to fully compensate for network-induced delays, the controller generates a sequence of control signals which are dependent on each possible delay in the feedforward channel. By taking the augmentation twice, we obtain delay-free stochastic closed-loop systems and the controlled output is chosen as the tracking error. Sufficient conditions are provided for the energy-to-peak performance of the closed-loop systems. The feedback gains of the controller can be derived by solving a minimisation problem. Two examples are illustrated to demonstrate the effectiveness of the proposed design method.     

面向新一代智能电表的微电流指纹自动配对技术

针对智能电表与表后断路器大多依赖人工掌机扫码进行配对,配对过程过度依赖人工,成本高,且容易发生误配对串户等问题,提出了面向新一代智能电表的微电流指纹自动配对技术。该技术通过在蓝牙断路器内置开关电容模块和编码电路,将配对特征码信息调制成无功电流信号,利用电力线传输至智能电表,并与蓝牙断路器广播发送的配对特征码信息进行比对,从而实现智能电表与表后断路器的自动配对。该配对过程无需依赖人工,极大地降低了人工成本,提高了配对的准确性。最后,实验验证了所提的微电流指纹自动配对技术的正确性和有效性。     

旋转部件非接触式测温装置供电及通信研究

针对高速辊体温度非接触式测量装置供电及通信单元结构复杂、易受干扰的问题,研制了一种结构简单、测量精度高的新型测温装置.利用由两个电感线圈构成的空心变压器既完成能量传送又能进行信息通信.定子侧直流电源经全桥逆变后利用电感耦合原理向转子供电.通过曼彻斯特编码方式调制采样数据得到通信信号,利用反向调制原理,向定子侧传递温度信息完成定转子之间通信.经理论计算与硬件实验表明,装置具有良好的供电稳定性以及通信抗干扰能力.     

Optimal signal design strategy with improper Gaussian signaling in the Z-interference channel

We propose a thoroughly optimal signal design strategy to achieve the Pareto boundary (boundary of the achievable rate region) with improper Gaussian signaling (IGS) on the Z-interference channel (Z-IC) under the assumption that the interference is treated as additive Gaussian noise. Specifically, we show that the Pareto boundary has two different schemes determined by the two paths manifesting the characteristic of improperly transmitted signals. In each scheme, we derive several concise closed-form expressions to calculate each user’s optimally transmitted power, covariance, and pseudo-covariance of improperly transmitted signals. The effectiveness of the proposed optimal signal design strategy is supported by simulations, and the results clearly show the superiority of IGS. The proposed optimal signal design strategy also provides a simple way to achieve the required rate region, with which we also derive a closed-form solution to quickly find the circularity coefficient that maximizes the sum rate. Finally, we provide an in-depth discussion of the structure of the Pareto boundary, characterized by the channel coefficient, the degree of impropriety measured by the covariance, and the pseudo-covariance of signals transmitted by two users.     

面向智能家居应用的ZigBee-WiFi网关

ZigBee和WiFi是智能家居设备常用的两种无线通信技术,针对智能家居设备使用ZigBee自组网无法和用户WiFi网络中的智能终端直接通信的问题,设计面向家庭应用环境的ZigBee-WiFi无线网关.网关采用S3C6410作为控制核心,运行Linux操作系统,以USB连接无线网卡,以DMA通道连接CC2530模块.通过信道扫描切换的方案解决ZigBee和WiFi两种信号之间相互干扰的问题,通过数据线连接的方式给要加入ZigBee网络的新设备分发密钥.实验表明,所实现的无线网关信号稳定,丢包率低,实用性强,在智能家居系统中运行稳定、可靠.