AB 1747-L553C

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描述

AB 1747-L553C

全面、真实的通信通道仿真是设计和验证的需要。针对卫星通信业务发展的需要,设计人员需要更为有效的仿真测试设备,要求它具有宽带仿真和测试功能,真实地模拟通道中环境坏损因素、以及通道中各部件对系统的影响。这样,设计人员才能在设计阶段有效地控制设计余度,同时满足成本、可靠性和容量的要求。
目前,卫星系统设计者在设计过程中可以使用若干种辅助工具。设计模拟和测试工具主要有以下三种:计算机建模和模拟工具、制造和发射试验卫星、卫星通道模拟器。
借助计算机建模和模拟工具,设计者可以建立多种信道坏损的模型,并通过模型综合考虑系统的总体性能。这些工具能够完成基本设计,并进行性能评估。此类软件用于台式机和高级工作站。为得到准确的结果,即使使用最快的处理器也需要花费大量的计算时间,这样就限制了模拟对象的数量,也限制了能够分析的综合坏损模型。这些模型也可能并没有正确反映实际情况。
此外,有的公司或者单位已经制造并发射了实验卫星,以便在真实环境中通过真实的硬件和软件来检测新的通信技术和理念。这些卫星包括ACT、Artemis、Kopernikus、N-Star、Superbird以及ItalsatF1。这些卫星的制造成本昂贵,但它们为当今宽带卫星设计的精细技术和定义方法提供了颇有价值的实验环境。卫星位于整个设计金字塔的塔尖,它们的性能通过设计来确定,因此根据需要更改技术规格的余地很小,同时也很难通过更改坏损机制来检测它们对系统整体性能的影响。卫星信道模拟器把测试环境和模拟环境很好地结合起来,为用户提供所需的精确度和实时性能。Aeroflex生产的CelerityCS80000宽带信道模拟器(BCS)系列就是很好的例子。这些模拟器在实验室中通过受控的、精确的、可重复的方式创建带有坏损机制的真实信道。因为这些信道是带有宽带射频输入和输出的实时系统,所以在测试过程中可以使用真实的硬件终端。和软件模型相比,这种实时测试可以运行更多检测对象,进而能进行更详细的测试。

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主营:本特利,英维思,伍德沃德,福克斯波罗、西屋、瑞恩、施耐德莫迪康、ABB、AB、西门子、摩托罗拉、GE发那科、安川、博世力士乐,ACSO,力士乐等各大品牌的DCS系统配件,机器人系统配件,大型伺服系统备件。

先介绍几点经验。
1、先通读一遍“系统手册”(不管能不能看懂,先了解个大概,以便学习编程时查找);
2、由位控逻辑入手,逐渐增加定时、计数等条件,把或、与、非关系理顺;
3、进而练习整数运算、实数运算、类型转换;
4、量程转换、PID调节回路的建立及P、I、D参数的理解(最好是有个物理回路验证,比如变频器+电机+测速传感器);
5、循环、顺序、跳转等程序控制(尽量避免跳转,非跳不可时也是跳的越近越好);
6、中断、通讯、位置控制....

本人以ABB工业机器人配件DSQC系列和Motorola MVME系列,GE 卡件 模块 驱动器系列为主攻。各位电工朋友可根据自己的条件选择适合自己的PLC品牌,由于PLC的基本框架大同小异,学会一种至于其它的学习起来也就简单了。