Then the thesis analyzed noise ’ s influence on angle precise of simulated signal and gave some primary principles which should be followed in the system design 进而分析噪声对信号模拟角度精度的影响,提出了模拟器系统设计中应遵循的一些基本准则。
Finally we measured the performance of the system , analyzed phase error ’ s influence on angle precision of simulated signal and gave the solution 最后对模拟器系统的性能进行了测试,分析了系统中相位误差对信号模拟角度精度的影响,并给出了解决办法。
From the simulation result , the serial port updating module are working normally . the simulated signal of illegal attack is defended while the background monitoring works effectively 通过测试结果,得出:机顶盒软件串口升级运行正常;模拟对正常信号的非法攻击得以屏蔽,后台监控正常。
Hardware controller uses the at89c51 monolithic integrated circuit , a / d transformation uses 12 bit transformations chips max187 , has completed the design of a front channel for sampling and processing the simulated signal 其中硬件单片机采用at89c51单片机, a / d转换采用12位转换芯片max187 ,完成了模拟信号从采样到处理的整个前向通道设计。
In the practices , aacs can judge the existence of risk of collision by receiving ais simulated signals . if such a risk does exist , the aacs then acknowledges it , gives out alarming signals and transmits them through the ais 在实践中,本系统通过模拟接收a旧信息数据,并判断是否存在碰撞危险;若存在危险,则判定危险物标,发出危险警告,并具有将危险警告信息通过a旧向外发送的功能。
The simulated signal is taken into the system and analysed using the method aforementioned as an example . according to the analysis results , the conclusions for evaluating the quality of final drive can be drawn more rapidly and rationally 主减速器振动信号分析方法可以替代现阶段在生产线上,利用熟练工人用耳听主减速器齿轮啮合声响来进行判断的方法,大大提高主减速器质量评估的速度和科学性,具有较强的现实意义。
The signal collecting system of singlechip collects the signals from generator . the paper introduces the every part of the singlechip . the key component is a 8051cpu , its surrounding circuits include dc power source , simulating signal collecting circuit , digital signal collecting circuit , a / d converting circuit , clock generating circuit , counting frequency circuit , controlling circuit , communicating circuit , and some other circuits 前台单片机采集系统完成对发电机组多信息量的采集,本文详细介绍了电路设计,系统的核心器件为8051cpu ,其外围电路包括电源电路、模拟信号采集电路、 a d转换电路、数字信号采集电路、时钟发生电路、测频电路、控制电路、通讯电路等。
Before the development of the system , the article describes the above - mentioned aspects , as the bases of the system development . the article emphasizes related auto - controlling technologies : open - 100p and close - 100p , and control mode of negative - feedback , the scatter and quantization of the simulate signal , the conception of a / d and d / a conversion and code / encode , the basic sampling principles of the simulate signal . the article introduces the operation method and process of the system by means of the load spectrum 文章对相关的理论进行了陈述,以作为系统开发的理论依据,重点阐述了自动控制系统中包括开环闭环在内的几大主要控制模式,以及有关的负反馈控制方式,模拟信号的离散与量化,模数转换、数模转换、编码译码的概念,及模拟信号采样的基本原理? ?采样定理,并以载荷谱法为例,简述了所研究的系统将要采取的工作方式及工作过程。
This control system adopts creditable plc for real control ; it sends many simulating signals collected by old sand temperature of inlet , suction opening temperature of double disk , inner sand temperature of double disk , current of mainframe and current of fan ; meanwhile , the operation signal and switching value signal outputted by material movement transducer is inputted to switching value module of plc ; it gets evidence of water feeding after cpu account ; the operation result of cpu is outputted by switching value of plc to control unlock combination of coarse , middle and thin water feeding electromagnetically operated valve and then gets different water feeding quantity 该控制系统采用高可靠性的plc可编程序控制器进行实时控制,传感器所采集的入口旧砂温度双盘抽风口温度双盘内砂温主电机电流及鼓风机电流等模拟量信号直接输入plc的模拟量采集模块,同时加砂设备运转信号及加砂设备物料移动检测传感器发出的开关量信号输入plc的开关量模块,由cpu获取经运算而得到加水计算依据, cpu运算结果直接由plc的开关量输出控制粗中细加水电磁阀的开启组合,而得到不同的加水量。
This dissertation , basing on simulation , makes a deep research on simulating signal of gmsk ( gaussian filtered minimun frequency shift keying ) baseband modulation and demodulation in ais ( automatic identification system ) equipment . the technology related in the following makes the modulation and demodulation of baseband signal into realization by ti dsp , at the same time , provides a key technique to develop ais system inland 本文着重对自动识别系统( ais - automaticidentificationsystem )设备的高斯滤波最小频移键控( gmsk - gaussianfilteredminimunfrequencyshiftkeying )基带调制解调信号进行了仿真研究,并在仿真的基础上,在ti的dsp上实现了基带信号的调制解调,为国内研制ais系统储备了关键技术。