一种实用的弹-地通讯接口设计

为实现普通个人计算机和弹载计算机间的弹一地通讯,对某型弹载计算机专用的增强型通讯接口电路和通讯协议进行了分析,设计了与之匹配的适用于普通计算机的通讯接口硬件电路,并进行了基于VB6．0的通讯程序设计。实际测试及运行结果说明,设计的通讯接口可实现高速、远距离、高可靠性的弹一地数据通讯,误码率低。     

舰载导弹武器系统接口转换器设计

舰载导弹武器系统大多采用RS-485接口组成局域网,而各设备仅具有RS-232接口,文中介绍了一种无须外部供电的接口转换器。采用串口取电技术设计了转换器的电源电路;选用新型低功耗器件设计了接口的硬件电路,给出了接口软件流程。设计舰载导弹武器系统接口转换器,实现了接口间的信号转换。     

CAN总线控制器与ARM微处理器的接口时序设计

在介绍CAN总线控制器和ARM微处理器接口特点的基础上,讨论了CAN控制器芯片 SJA1000和ARM微处理器S3C44BOX的接口时序的适配问题,给出了两者的接口方法和电路并进行了仿真分析。     

一种可实现增益、带宽独立调控的低噪声MEMS加速度计接口电路设计

为了进一步满足振梁式加速度计（VBA）对前端放大接口电路增益、带宽以及噪声的更高要求，提出了一种适用于硅微振梁式加速度计的可实现增益、带宽独立调控的低噪声前端放大接口电路。该设计基于T型接口电路的两级拓扑结构，有效解决了增益、带宽和噪声之间的制约问题。通过仿真与实验结果表明，该设计在等效跨阻增益为40MΩ的前提下，最终实现了带宽为410kHz、相位误差为1.2°、等效输入电流噪声密度为8.9fA/Hz。基于该设计的实验样机在上电稳定后1h零偏不稳定性达1.156μg，相较于传统一级跨阻接口电路减小了49.2%（2.274μg），验证了该新型接口电路的可行性和优越性。     

计算机报警系统中接口电路研究

在计算机报警系统中 ,接口电路承担把外部信号准确传给计算机 ,同时把计算机指令输出并控制执行的双重功能 ,其输入输出功能的实现和准确可靠地工作对于整个控制系统都是非常重要的。本文对报警系统总线结构及接口模块进行充分地分析 ,在电路设计中采用编码技术和脉冲、电源复用技术 ,使电路优化、成本降低、运行稳定、兼容性好 ,较好地实现了输入及输出功能。     

复杂电磁环境下RS422接口保护电路的实现

在复杂电磁环境下如果对422通信接口进行带电热插拔操作会引发高电压冲击,当热插拔瞬间放电电流大于串口芯片所能承受的最大电流时,串口通信接口电路会被烧毁,为了有效保护通信接口电路,介绍了一种的串口热插拔保护电路,它的原理是使用对地二极管将瞬态的高电压抑制下来,在不改动设备的前提下可以对422通信接口电路提供有效的保护。经实践证明对RS422接口电路有明显的保护作用,也可以应用于其他串行通信电路。     

∑-△型模/数转换方式的研究

模/数转换是控制系统中重要的接口电路,本文对种类繁多的模/数转换电路按照它们的转换方式进行了分类和比较,介绍了模/数转换技术的发展趋势和新兴的∑一△型模/数转换的几个基本概念.     

停声不停光的八路上下越限故障报警电路

本文介绍的停声不停光的八路上下越限故障报警电路。是通过5G8243扩展接口芯片和D触发器的开关作用实现的。该电路结构简单、紧凑，易于维修、更换。同时，为了便于理解该电路的硬件原理图，又对5G8243扩展接口芯片的使用作了详细的介绍和对D触发器的停声不停光的开关作用也作了必要的说明。     

基于CPLD的LBE总线与I^2C总线接口的实现

分析了I^2C串行总线的数据传输机制,描述了LBE总线的时序要求,设计了基于CPLD的I^2C总线主模式与LBE总线的接口电路,其中包括LBE总线接口逻辑和I^2C总线接口逻辑两部分。最后,给出了在Lattice4.1＋ModelSim6.0软件平台中进行逻辑综合与时序仿真的结果。     

基于CPLD的RS422接口电路设计

RS422总线目前已大量用于长距离线路通讯.阐述了一种利用CPLD作为主控单元所构成的RS422接口转换电路,该接口电路所有运算功能均采用硬件逻辑实现,具有响应速度快、可靠性高、通用性和灵活性强的特点.     

Limiter-Discriminator Detection Performance of Manchester and NRZ Coded FSK

The theory of limiter-discriminator detection of a frequency shift keyed (FSK) carrier is reviewed and this theory is used to predict the bit error probability performance of Manchester coded and nonreturn-to-zero (NRZ) coded data. A major result of the study is that the predetection time bandwidth product BT and the devia tion ratio h needed to give optimum performance for Manchester coding are seen to be larger than optimum NRZ FSK. Specifically, BT ~ 2 and h ~ 1 will result in Manchester performance about 2 dB worse than optimum NRZ.     

PROFIBUS—PA传输技术与曼彻斯特编码

本文主要讨论了PROFIBUS总线中PROFIBUS－PA的IEC1158－2标准传输技术的特点及在提高总线可靠性方面所作的有关曼彻斯特编码技术的研究。     

Noncoherent Radar Pulse Compression Based on Complementary Sequences

Noncoherent pulse compression (NCPC), suggested recently, uses on-off keying (OOK) signals, obtained from Manchester coding a binary sequence with favorable a-periodic autocorrelation. This paper investigates the use of binary complementary pairs as a basis for NCPC. It shows that a pair of Manchester coded, N-element binary complementary sequences will yield a peak sidelobe (PSL) ratio of 1/(2N).     

Optical fiber data bus modulation techniques for military avionics

In this paper, we propose several modulation techniques for use in military avionics optical fiber data buses, namely, Extended Manchester II Bi-Phase Coding with Beginning-Stopping Flags, Partial Trilevel Manchester II Bi-Phase Coding, Four-ary Pulse Width Modulation, Two-ary Pulse Width Modulation with Amplitude-Distinguished Sync Field, Two-ary Message Pulse Width Modulation and Two-ary Sync Pulse Amplitude Modulation, respectively. Compared with an existing modulation scheme of MIL-STD-1773 avionics data buses, the proposed techniques can be effectively used to overcome the difficulty in recognizing the correct operation states of an active transmitter at the output of optical receivers. The feasibility of proposed modulation schemes are discussed, and their performance is also evaluated     

曼联驾到

7月25日,英国曼彻斯特联队和上海申花队在上海体育场进行了一场名为"雪佛兰中国杯"的友谊赛。这是著名的曼彻斯特联足球俱乐部继1999年后第二次访沪。与13年前的那支"红魔"相比,如今换了老板的曼联在收入和利润方面飙升了好几倍,虽然过于注重商业化使得这支老牌劲旅在外界眼中变得愈发功利,但不可否认的是,曼联仍是这个星球上动作得最成功的足球俱乐部之一。曼联驾到,上海滩怎能不掀起一番"红魔浪潮"……     

A method of obtaining signal components of residual carrier signalwith their power content and computer simulation

An algorithm for obtaining all signal components of a residual carrier signal with any number of channels is presented. The phase modulation type may be NRZ-L or split phase (Manchester). The algorithm also provides an easy way of obtaining the power contents of the signal components. Steps to recognize the signal components that influence the carrier tracking loop and the data tracking loop at the receiver are given. A computer program for numerical computation is also given     

ASPeCT: Unambiguous sine-BOC(n,n) acquisition/tracking technique for navigation applications

This article presents a new tracking technique for sine-BOC(n,n) (or Manchester encoded) ranging signals, which is most likely to be a part of the new European Global Navigation Satellite System (GNSS), Galileo, signal plan. When traditional sine-BOC(n,n) tracking is considered, although offering excellent performance compared with current signals, it has the main drawback of potentially giving biased measurements. The new method presented herein allows the removal of this threat while maintaining the same level of performance. An adapted version of this technique can also be used for acquisition purposes     

Modern cockpit complexity challenges pilot interfaces

Advances in the use of automated cockpits are examined. Crashes at Nagoya and Toulouse in 1994 and incidents at Manchester, England, and Paris Orly are used as examples of cockpit automation versus manual operation of aircraft. Human factors researchers conclude that flight management systems (FMS) should have fewer modes and less authority. Reducing complexity and authority override systems of FMS can provide pilots with greater flexibility during crises. Aircraft discussed include Boeing 737-300 and 757-200, Airbus A300-600 and A310, McDonnell Douglas MD-11, and Tarom A310-300.     

大气湍流对APD直接检测接收机抗噪声性能影响

针对以往分析湍流信道对系统抗噪声性能影响的不足,给出了一种基于APD直接检测接收机的湍流噪声的处理方法.在APD直接检测接收机模型的基础上,推导了其信噪比和曼彻斯特编码系统的差错概率,并详细分析了湍流对接收机的抗噪声性能影响.结果表明,增大接收天线孔径可以减弱湍流的影响,但在天线孔径较小时,增加发射功率并不能有效地提高...     

Military avionics optical fiber data buses with active-couplerconfigurations

Military avionics optical fiber data buses of high reliability are discussed. Because Light Emitting Diodes (LED's) have better temperature performance and require less complex driver circuits than laser diodes, the former is normally chosen as an optical source in the severe aircraft environment at present. In this case, optical power budget becomes a critical factor which can significantly limit the number of terminals in a data bus. To effectively solve this problem while maintaining a high reliability, we present several configurations of all-active couplers and hybrid passive/active couplers for avionics optical fiber data buses using PIN photodiodes and LED's. The system design is also described, which incorporates a modulation scheme called partial trilevel Manchester II bi-phase coding